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| -rw-r--r-- | src/PDFGen/pdfgen.c | 4057 |
1 files changed, 4057 insertions, 0 deletions
diff --git a/src/PDFGen/pdfgen.c b/src/PDFGen/pdfgen.c new file mode 100644 index 0000000..4d9cf45 --- /dev/null +++ b/src/PDFGen/pdfgen.c @@ -0,0 +1,4057 @@ +/* pdfgen.c provided courtesy of https://github.com/AndreRenaud/PDFGen + * + * Thank You ! + */ + +/** + * Simple engine for creating PDF files. + * It supports text, shapes, images etc... + * Capable of handling millions of objects without too much performance + * penalty. + * Public domain license - no warrenty implied; use at your own risk. + */ + +/** + * PDF HINTS & TIPS + * The specification can be found at + * https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/pdf_reference_archives/PDFReference.pdf + * The following sites have various bits & pieces about PDF document + * generation + * http://www.mactech.com/articles/mactech/Vol.15/15.09/PDFIntro/index.html + * http://gnupdf.org/Introduction_to_PDF + * http://www.planetpdf.com/mainpage.asp?WebPageID=63 + * http://archive.vector.org.uk/art10008970 + * http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf + * https://blog.idrsolutions.com/2013/01/understanding-the-pdf-file-format-overview/ + * + * To validate the PDF output, there are several online validators: + * http://www.validatepdfa.com/online.htm + * http://www.datalogics.com/products/callas/callaspdfA-onlinedemo.asp + * http://www.pdf-tools.com/pdf/validate-pdfa-online.aspx + * + * In addition the 'pdftk' server can be used to analyse the output: + * https://www.pdflabs.com/docs/pdftk-cli-examples/ + * + * PDF page markup operators: + * b closepath, fill,and stroke path. + * B fill and stroke path. + * b* closepath, eofill,and stroke path. + * B* eofill and stroke path. + * BI begin image. + * BMC begin marked content. + * BT begin text object. + * BX begin section allowing undefined operators. + * c curveto. + * cm concat. Concatenates the matrix to the current transform. + * cs setcolorspace for fill. + * CS setcolorspace for stroke. + * d setdash. + * Do execute the named XObject. + * DP mark a place in the content stream, with a dictionary. + * EI end image. + * EMC end marked content. + * ET end text object. + * EX end section that allows undefined operators. + * f fill path. + * f* eofill Even/odd fill path. + * g setgray (fill). + * G setgray (stroke). + * gs set parameters in the extended graphics state. + * h closepath. + * i setflat. + * ID begin image data. + * j setlinejoin. + * J setlinecap. + * k setcmykcolor (fill). + * K setcmykcolor (stroke). + * l lineto. + * m moveto. + * M setmiterlimit. + * n end path without fill or stroke. + * q save graphics state. + * Q restore graphics state. + * re rectangle. + * rg setrgbcolor (fill). + * RG setrgbcolor (stroke). + * s closepath and stroke path. + * S stroke path. + * sc setcolor (fill). + * SC setcolor (stroke). + * sh shfill (shaded fill). + * Tc set character spacing. + * Td move text current point. + * TD move text current point and set leading. + * Tf set font name and size. + * Tj show text. + * TJ show text, allowing individual character positioning. + * TL set leading. + * Tm set text matrix. + * Tr set text rendering mode. + * Ts set super/subscripting text rise. + * Tw set word spacing. + * Tz set horizontal scaling. + * T* move to start of next line. + * v curveto. + * w setlinewidth. + * W clip. + * y curveto. + */ + +#if defined(_MSC_VER) +#define _CRT_SECURE_NO_WARNINGS 1 // Drop the MSVC complaints about snprintf +#define _USE_MATH_DEFINES +#include <BaseTsd.h> +typedef SSIZE_T ssize_t; +#else + +#ifndef _POSIX_SOURCE +#define _POSIX_SOURCE /* For localtime_r */ +#endif + +#ifndef _XOPEN_SOURCE +#define _XOPEN_SOURCE 600 /* for M_SQRT2 */ +#endif + +#include <sys/types.h> /* for ssize_t */ +#endif + +#include <ctype.h> +#include <errno.h> +#include <inttypes.h> +#include <locale.h> +#include <math.h> +#include <stdarg.h> +#include <stdbool.h> +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <time.h> + +#include "pdfgen.h" + +#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) + +#define PDF_RGB_R(c) (float)((((c) >> 16) & 0xff) / 255.0) +#define PDF_RGB_G(c) (float)((((c) >> 8) & 0xff) / 255.0) +#define PDF_RGB_B(c) (float)((((c) >> 0) & 0xff) / 255.0) +#define PDF_IS_TRANSPARENT(c) (((c) >> 24) == 0xff) + +#if defined(_MSC_VER) +#define inline __inline +#define snprintf _snprintf +#define strcasecmp _stricmp +#define strncasecmp _strnicmp +#ifdef stat +#undef stat +#endif +#define stat _stat +#define SKIP_ATTRIBUTE +#else +#include <strings.h> // strcasecmp +#endif + +/** + * Try and support big & little endian machines + */ +static inline uint32_t bswap32(uint32_t x) +{ + return (((x & 0xff000000u) >> 24) | ((x & 0x00ff0000u) >> 8) | + ((x & 0x0000ff00u) << 8) | ((x & 0x000000ffu) << 24)); +} + +#ifdef __has_include // C++17, supported as extension to C++11 in clang, GCC + // 5+, vs2015 +#if __has_include(<endian.h>) +#include <endian.h> // gnu libc normally provides, linux +#elif __has_include(<machine/endian.h>) +#include <machine/endian.h> //open bsd, macos +#elif __has_include(<sys/param.h>) +#include <sys/param.h> // mingw, some bsd (not open/macos) +#elif __has_include(<sys/isadefs.h>) +#include <sys/isadefs.h> // solaris +#endif +#endif + +#if !defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__) +#ifndef __BYTE_ORDER__ +/* Fall back to little endian by default */ +#define __LITTLE_ENDIAN__ +#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ || __BYTE_ORDER == __BIG_ENDIAN +#define __BIG_ENDIAN__ +#else +#define __LITTLE_ENDIAN__ +#endif +#endif + +#if defined(__LITTLE_ENDIAN__) +#define ntoh32(x) bswap32((x)) +#elif defined(__BIG_ENDIAN__) +#define ntoh32(x) (x) +#endif + +// Limits on image sizes for sanity checking & to avoid plausible overflow +// issues +#define MAX_IMAGE_WIDTH (16 * 1024) +#define MAX_IMAGE_HEIGHT (16 * 1024) + +// Signatures for various image formats +static const uint8_t bmp_signature[] = {'B', 'M'}; +static const uint8_t png_signature[] = {0x89, 0x50, 0x4E, 0x47, + 0x0D, 0x0A, 0x1A, 0x0A}; +static const uint8_t jpeg_signature[] = {0xff, 0xd8}; +static const uint8_t ppm_signature[] = {'P', '6'}; +static const uint8_t pgm_signature[] = {'P', '5'}; + +// Special signatures for PNG chunks +static const char png_chunk_header[] = "IHDR"; +static const char png_chunk_palette[] = "PLTE"; +static const char png_chunk_data[] = "IDAT"; +static const char png_chunk_end[] = "IEND"; + +typedef struct pdf_object pdf_object; + +enum { + OBJ_none, /* skipped */ + OBJ_info, + OBJ_stream, + OBJ_font, + OBJ_page, + OBJ_bookmark, + OBJ_outline, + OBJ_catalog, + OBJ_pages, + OBJ_image, + OBJ_link, + + OBJ_count, +}; + +struct flexarray { + void ***bins; + int item_count; + int bin_count; +}; + +/** + * Simple dynamic string object. Tries to store a reasonable amount on the + * stack before falling back to malloc once things get large + */ +struct dstr { + char static_data[128]; + char *data; + size_t alloc_len; + size_t used_len; +}; + +struct pdf_object { + int type; /* See OBJ_xxxx */ + int index; /* PDF output index */ + int offset; /* Byte position within the output file */ + struct pdf_object *prev; /* Previous of this type */ + struct pdf_object *next; /* Next of this type */ + union { + struct { + struct pdf_object *page; + char name[64]; + struct pdf_object *parent; + struct flexarray children; + } bookmark; + struct dstr stream; + struct { + float width; + float height; + struct flexarray children; + struct flexarray annotations; + } page; + struct pdf_info *info; + struct { + char name[64]; + int index; + } font; + struct { + struct pdf_object *page; /* Page containing link */ + float llx; /* Clickable rectangle */ + float lly; + float urx; + float ury; + struct pdf_object *target_page; /* Target page */ + float target_x; /* Target location */ + float target_y; + } link; + }; +}; + +struct pdf_doc { + char errstr[128]; + int errval; + struct flexarray objects; + + float width; + float height; + + struct pdf_object *current_font; + + struct pdf_object *last_objects[OBJ_count]; + struct pdf_object *first_objects[OBJ_count]; +}; + +/** + * Since we're casting random areas of memory to these, make sure + * they're packed properly to match the image format requirements + */ +#pragma pack(push, 1) +struct png_chunk { + uint32_t length; + // chunk type, see png_chunk_header, png_chunk_data, png_chunk_end + char type[4]; +}; + +#pragma pack(pop) + +// Simple data container to store a single 24 Bit RGB value, used for +// processing PNG images +struct rgb_value { + uint8_t red; + uint8_t blue; + uint8_t green; +}; + +/** + * Simple flexible resizing array implementation + * The bins get larger in powers of two + * bin 0 = 1024 items + * 1 = 2048 items + * 2 = 4096 items + * etc... + */ +/* What is the first index that will be in the given bin? */ +#define MIN_SHIFT 10 +#define MIN_OFFSET ((1 << MIN_SHIFT) - 1) +static int bin_offset[] = { + (1 << (MIN_SHIFT + 0)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 1)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 2)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 3)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 4)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 5)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 6)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 7)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 8)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 9)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 10)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 11)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 12)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 13)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 14)) - 1 - MIN_OFFSET, + (1 << (MIN_SHIFT + 15)) - 1 - MIN_OFFSET, +}; + +static inline int flexarray_get_bin(const struct flexarray *flex, int index) +{ + (void)flex; + for (size_t i = 0; i < ARRAY_SIZE(bin_offset); i++) + if (index < bin_offset[i]) + return i - 1; + return -1; +} + +static inline int flexarray_get_bin_size(const struct flexarray *flex, + int bin) +{ + (void)flex; + if (bin >= (int)ARRAY_SIZE(bin_offset) - 1) + return -1; + int next = bin_offset[bin + 1]; + return next - bin_offset[bin]; +} + +static inline int flexarray_get_bin_offset(const struct flexarray *flex, + int bin, int index) +{ + (void)flex; + return index - bin_offset[bin]; +} + +static void flexarray_clear(struct flexarray *flex) +{ + for (int i = 0; i < flex->bin_count; i++) + free(flex->bins[i]); + free(flex->bins); + flex->bin_count = 0; + flex->item_count = 0; +} + +static inline int flexarray_size(const struct flexarray *flex) +{ + return flex->item_count; +} + +static int flexarray_set(struct flexarray *flex, int index, void *data) +{ + int bin = flexarray_get_bin(flex, index); + if (bin < 0) + return -EINVAL; + if (bin >= flex->bin_count) { + void ***bins = (void ***)realloc(flex->bins, (flex->bin_count + 1) * + sizeof(*flex->bins)); + if (!bins) + return -ENOMEM; + flex->bin_count++; + flex->bins = bins; + flex->bins[flex->bin_count - 1] = + (void **)calloc(flexarray_get_bin_size(flex, flex->bin_count - 1), + sizeof(void *)); + if (!flex->bins[flex->bin_count - 1]) { + flex->bin_count--; + return -ENOMEM; + } + } + flex->item_count++; + flex->bins[bin][flexarray_get_bin_offset(flex, bin, index)] = data; + return flex->item_count - 1; +} + +static inline int flexarray_append(struct flexarray *flex, void *data) +{ + return flexarray_set(flex, flexarray_size(flex), data); +} + +static inline void *flexarray_get(const struct flexarray *flex, int index) +{ + int bin; + + if (index >= flex->item_count) + return NULL; + bin = flexarray_get_bin(flex, index); + if (bin < 0 || bin >= flex->bin_count) + return NULL; + return flex->bins[bin][flexarray_get_bin_offset(flex, bin, index)]; +} + +/** + * Simple dynamic string object. Tries to store a reasonable amount on the + * stack before falling back to malloc once things get large + */ + +#define INIT_DSTR \ + (struct dstr) \ + { \ + .static_data = {0}, .data = NULL, .alloc_len = 0, .used_len = 0 \ + } + +static char *dstr_data(struct dstr *str) +{ + return str->data ? str->data : str->static_data; +} + +static size_t dstr_len(const struct dstr *str) +{ + return str->used_len; +} + +static ssize_t dstr_ensure(struct dstr *str, size_t len) +{ + if (len <= str->alloc_len) + return 0; + if (!str->data && len <= sizeof(str->static_data)) + str->alloc_len = len; + else if (str->alloc_len < len) { + size_t new_len; + + new_len = len + 4096; + + if (str->data) { + char *new_data = (char *)realloc((void *)str->data, new_len); + if (!new_data) + return -ENOMEM; + str->data = new_data; + } else { + str->data = (char *)malloc(new_len); + if (!str->data) + return -ENOMEM; + if (str->used_len) + memcpy(str->data, str->static_data, str->used_len + 1); + } + + str->alloc_len = new_len; + } + return 0; +} + +// Locales can replace the decimal character with a ','. +// This breaks the PDF output, so we force a 'safe' locale. +static void force_locale(char *buf, int len) +{ + char *saved_locale = setlocale(LC_ALL, NULL); + + if (!saved_locale) { + *buf = '\0'; + } else { + strncpy(buf, saved_locale, len - 1); + buf[len - 1] = '\0'; + } + + setlocale(LC_NUMERIC, "POSIX"); +} + +static void restore_locale(char *buf) +{ + setlocale(LC_ALL, buf); +} + +#ifndef SKIP_ATTRIBUTE +static int dstr_printf(struct dstr *str, const char *fmt, ...) + __attribute__((format(printf, 2, 3))); +#endif +static int dstr_printf(struct dstr *str, const char *fmt, ...) +{ + va_list ap, aq; + int len; + char saved_locale[32]; + + force_locale(saved_locale, sizeof(saved_locale)); + + va_start(ap, fmt); + va_copy(aq, ap); + len = vsnprintf(NULL, 0, fmt, ap); + if (dstr_ensure(str, str->used_len + len + 1) < 0) { + va_end(ap); + va_end(aq); + restore_locale(saved_locale); + return -ENOMEM; + } + vsprintf(dstr_data(str) + str->used_len, fmt, aq); + str->used_len += len; + va_end(ap); + va_end(aq); + restore_locale(saved_locale); + + return len; +} + +static ssize_t dstr_append_data(struct dstr *str, const void *extend, + size_t len) +{ + if (dstr_ensure(str, str->used_len + len + 1) < 0) + return -ENOMEM; + memcpy(dstr_data(str) + str->used_len, extend, len); + str->used_len += len; + dstr_data(str)[str->used_len] = '\0'; + return len; +} + +static ssize_t dstr_append(struct dstr *str, const char *extend) +{ + return dstr_append_data(str, extend, strlen(extend)); +} + +static void dstr_free(struct dstr *str) +{ + if (str->data) + free(str->data); + *str = INIT_DSTR; +} + +/** + * PDF Implementation + */ + +#ifndef SKIP_ATTRIBUTE +static int pdf_set_err(struct pdf_doc *doc, int errval, const char *buffer, + ...) __attribute__((format(printf, 3, 4))); +#endif +static int pdf_set_err(struct pdf_doc *doc, int errval, const char *buffer, + ...) +{ + va_list ap; + int len; + + va_start(ap, buffer); + len = vsnprintf(doc->errstr, sizeof(doc->errstr) - 1, buffer, ap); + va_end(ap); + + if (len < 0) { + doc->errstr[0] = '\0'; + return errval; + } + + if (len >= (int)(sizeof(doc->errstr) - 1)) + len = (int)(sizeof(doc->errstr) - 1); + + doc->errstr[len] = '\0'; + doc->errval = errval; + + return errval; +} + +const char *pdf_get_err(const struct pdf_doc *pdf, int *errval) +{ + if (!pdf) + return NULL; + if (pdf->errstr[0] == '\0') + return NULL; + if (errval) + *errval = pdf->errval; + return pdf->errstr; +} + +void pdf_clear_err(struct pdf_doc *pdf) +{ + if (!pdf) + return; + pdf->errstr[0] = '\0'; + pdf->errval = 0; +} + +static int pdf_get_errval(struct pdf_doc *pdf) +{ + if (!pdf) + return 0; + return pdf->errval; +} + +static struct pdf_object *pdf_get_object(const struct pdf_doc *pdf, int index) +{ + return (struct pdf_object *)flexarray_get(&pdf->objects, index); +} + +static int pdf_append_object(struct pdf_doc *pdf, struct pdf_object *obj) +{ + int index = flexarray_append(&pdf->objects, obj); + + if (index < 0) + return index; + obj->index = index; + + if (pdf->last_objects[obj->type]) { + obj->prev = pdf->last_objects[obj->type]; + pdf->last_objects[obj->type]->next = obj; + } + pdf->last_objects[obj->type] = obj; + + if (!pdf->first_objects[obj->type]) + pdf->first_objects[obj->type] = obj; + + return 0; +} + +static void pdf_object_destroy(struct pdf_object *object) +{ + switch (object->type) { + case OBJ_stream: + case OBJ_image: + dstr_free(&object->stream); + break; + case OBJ_page: + flexarray_clear(&object->page.children); + flexarray_clear(&object->page.annotations); + break; + case OBJ_info: + free(object->info); + break; + case OBJ_bookmark: + flexarray_clear(&object->bookmark.children); + break; + } + free(object); +} + +static struct pdf_object *pdf_add_object(struct pdf_doc *pdf, int type) +{ + struct pdf_object *obj; + + if (!pdf) + return NULL; + + obj = (struct pdf_object *)calloc(1, sizeof(*obj)); + if (!obj) { + pdf_set_err(pdf, -errno, + "Unable to allocate object %d of type %d: %s", + flexarray_size(&pdf->objects) + 1, type, strerror(errno)); + return NULL; + } + + obj->type = type; + + if (pdf_append_object(pdf, obj) < 0) { + free(obj); + return NULL; + } + + return obj; +} + +static void pdf_del_object(struct pdf_doc *pdf, struct pdf_object *obj) +{ + int type = obj->type; + flexarray_set(&pdf->objects, obj->index, NULL); + if (pdf->last_objects[type] == obj) { + pdf->last_objects[type] = NULL; + for (int i = 0; i < flexarray_size(&pdf->objects); i++) { + struct pdf_object *o = pdf_get_object(pdf, i); + if (o && o->type == type) + pdf->last_objects[type] = o; + } + } + + if (pdf->first_objects[type] == obj) { + pdf->first_objects[type] = NULL; + for (int i = 0; i < flexarray_size(&pdf->objects); i++) { + struct pdf_object *o = pdf_get_object(pdf, i); + if (o && o->type == type) { + pdf->first_objects[type] = o; + break; + } + } + } + + pdf_object_destroy(obj); +} + +struct pdf_doc *pdf_create(float width, float height, + const struct pdf_info *info) +{ + struct pdf_doc *pdf; + struct pdf_object *obj; + + pdf = (struct pdf_doc *)calloc(1, sizeof(*pdf)); + if (!pdf) + return NULL; + pdf->width = width; + pdf->height = height; + + /* We don't want to use ID 0 */ + pdf_add_object(pdf, OBJ_none); + + /* Create the 'info' object */ + obj = pdf_add_object(pdf, OBJ_info); + if (!obj) { + pdf_destroy(pdf); + return NULL; + } + obj->info = (struct pdf_info *)calloc(sizeof(*obj->info), 1); + if (!obj->info) { + pdf_destroy(pdf); + return NULL; + } + if (info) { + *obj->info = *info; + obj->info->creator[sizeof(obj->info->creator) - 1] = '\0'; + obj->info->producer[sizeof(obj->info->producer) - 1] = '\0'; + obj->info->title[sizeof(obj->info->title) - 1] = '\0'; + obj->info->author[sizeof(obj->info->author) - 1] = '\0'; + obj->info->subject[sizeof(obj->info->subject) - 1] = '\0'; + obj->info->date[sizeof(obj->info->date) - 1] = '\0'; + } + /* FIXME: Should be quoting PDF strings? */ + if (!obj->info->date[0]) { + time_t now = time(NULL); + struct tm tm; +#ifdef _WIN32 + struct tm *tmp; + tmp = localtime(&now); + tm = *tmp; +#else + localtime_r(&now, &tm); +#endif + strftime(obj->info->date, sizeof(obj->info->date), "%Y%m%d%H%M%SZ", + &tm); + } + + if (!pdf_add_object(pdf, OBJ_pages)) { + pdf_destroy(pdf); + return NULL; + } + if (!pdf_add_object(pdf, OBJ_catalog)) { + pdf_destroy(pdf); + return NULL; + } + + if (pdf_set_font(pdf, "Times-Roman") < 0) { + pdf_destroy(pdf); + return NULL; + } + + return pdf; +} + +float pdf_width(const struct pdf_doc *pdf) +{ + return pdf->width; +} + +float pdf_height(const struct pdf_doc *pdf) +{ + return pdf->height; +} + +float pdf_page_width(const struct pdf_object *page) +{ + return page->page.width; +} + +float pdf_page_height(const struct pdf_object *page) +{ + return page->page.height; +} + +void pdf_destroy(struct pdf_doc *pdf) +{ + if (pdf) { + for (int i = 0; i < flexarray_size(&pdf->objects); i++) + pdf_object_destroy(pdf_get_object(pdf, i)); + flexarray_clear(&pdf->objects); + free(pdf); + } +} + +static struct pdf_object *pdf_find_first_object(const struct pdf_doc *pdf, + int type) +{ + if (!pdf) + return NULL; + return pdf->first_objects[type]; +} + +static struct pdf_object *pdf_find_last_object(const struct pdf_doc *pdf, + int type) +{ + if (!pdf) + return NULL; + return pdf->last_objects[type]; +} + +int pdf_set_font(struct pdf_doc *pdf, const char *font) +{ + struct pdf_object *obj; + int last_index = 0; + + /* See if we've used this font before */ + for (obj = pdf_find_first_object(pdf, OBJ_font); obj; obj = obj->next) { + if (strcmp(obj->font.name, font) == 0) + break; + last_index = obj->font.index; + } + + /* Create a new font object if we need it */ + if (!obj) { + obj = pdf_add_object(pdf, OBJ_font); + if (!obj) + return pdf->errval; + strncpy(obj->font.name, font, sizeof(obj->font.name) - 1); + obj->font.name[sizeof(obj->font.name) - 1] = '\0'; + obj->font.index = last_index + 1; + } + + pdf->current_font = obj; + + return 0; +} + +struct pdf_object *pdf_append_page(struct pdf_doc *pdf) +{ + struct pdf_object *page; + + page = pdf_add_object(pdf, OBJ_page); + + if (!page) + return NULL; + + page->page.width = pdf->width; + page->page.height = pdf->height; + + return page; +} + +int pdf_page_set_size(struct pdf_doc *pdf, struct pdf_object *page, + float width, float height) +{ + if (!page) + page = pdf_find_last_object(pdf, OBJ_page); + + if (!page || page->type != OBJ_page) + return pdf_set_err(pdf, -EINVAL, "Invalid PDF page"); + page->page.width = width; + page->page.height = height; + return 0; +} + +// Recursively scan for the number of children +static int pdf_get_bookmark_count(const struct pdf_object *obj) +{ + int count = 0; + if (obj->type == OBJ_bookmark) { + int nchildren = flexarray_size(&obj->bookmark.children); + count += nchildren; + for (int i = 0; i < nchildren; i++) { + count += pdf_get_bookmark_count( + (const struct pdf_object *)flexarray_get( + &obj->bookmark.children, i)); + } + } + return count; +} + +static int pdf_save_object(struct pdf_doc *pdf, FILE *fp, int index) +{ + struct pdf_object *object = pdf_get_object(pdf, index); + if (!object) + return -ENOENT; + + if (object->type == OBJ_none) + return -ENOENT; + + object->offset = ftell(fp); + + fprintf(fp, "%d 0 obj\r\n", index); + + switch (object->type) { + case OBJ_stream: + case OBJ_image: { + fwrite(dstr_data(&object->stream), dstr_len(&object->stream), 1, fp); + break; + } + case OBJ_info: { + struct pdf_info *info = object->info; + + fprintf(fp, "<<\r\n"); + if (info->creator[0]) + fprintf(fp, " /Creator (%s)\r\n", info->creator); + if (info->producer[0]) + fprintf(fp, " /Producer (%s)\r\n", info->producer); + if (info->title[0]) + fprintf(fp, " /Title (%s)\r\n", info->title); + if (info->author[0]) + fprintf(fp, " /Author (%s)\r\n", info->author); + if (info->subject[0]) + fprintf(fp, " /Subject (%s)\r\n", info->subject); + if (info->date[0]) + fprintf(fp, " /CreationDate (D:%s)\r\n", info->date); + fprintf(fp, ">>\r\n"); + break; + } + + case OBJ_page: { + struct pdf_object *pages = pdf_find_first_object(pdf, OBJ_pages); + struct pdf_object *image = pdf_find_first_object(pdf, OBJ_image); + + fprintf(fp, + "<<\r\n" + " /Type /Page\r\n" + " /Parent %d 0 R\r\n", + pages->index); + fprintf(fp, " /MediaBox [0 0 %f %f]\r\n", object->page.width, + object->page.height); + fprintf(fp, " /Resources <<\r\n"); + fprintf(fp, " /Font <<\r\n"); + for (struct pdf_object *font = pdf_find_first_object(pdf, OBJ_font); + font; font = font->next) + fprintf(fp, " /F%d %d 0 R\r\n", font->font.index, + font->index); + fprintf(fp, " >>\r\n"); + // We trim transparency to just 4-bits + fprintf(fp, " /ExtGState <<\r\n"); + for (int i = 0; i < 16; i++) { + fprintf(fp, " /GS%d <</ca %f>>\r\n", i, + (float)(15 - i) / 15); + } + fprintf(fp, " >>\r\n"); + + if (image) { + fprintf(fp, " /XObject <<"); + for (; image; image = image->next) + fprintf(fp, " /Image%d %d 0 R ", image->index, + image->index); + fprintf(fp, " >>\r\n"); + } + fprintf(fp, " >>\r\n"); + + fprintf(fp, " /Contents [\r\n"); + for (int i = 0; i < flexarray_size(&object->page.children); i++) { + struct pdf_object *child = + (struct pdf_object *)flexarray_get(&object->page.children, i); + fprintf(fp, "%d 0 R\r\n", child->index); + } + fprintf(fp, "]\r\n"); + + if (flexarray_size(&object->page.annotations)) { + fprintf(fp, " /Annots [\r\n"); + for (int i = 0; i < flexarray_size(&object->page.annotations); + i++) { + struct pdf_object *child = (struct pdf_object *)flexarray_get( + &object->page.annotations, i); + fprintf(fp, "%d 0 R\r\n", child->index); + } + fprintf(fp, "]\r\n"); + } + + fprintf(fp, ">>\r\n"); + break; + } + + case OBJ_bookmark: { + struct pdf_object *parent, *other; + + parent = object->bookmark.parent; + if (!parent) + parent = pdf_find_first_object(pdf, OBJ_outline); + if (!object->bookmark.page) + break; + fprintf(fp, + "<<\r\n" + " /Dest [%d 0 R /XYZ 0 %f null]\r\n" + " /Parent %d 0 R\r\n" + " /Title (%s)\r\n", + object->bookmark.page->index, pdf->height, parent->index, + object->bookmark.name); + int nchildren = flexarray_size(&object->bookmark.children); + if (nchildren > 0) { + struct pdf_object *f, *l; + f = (struct pdf_object *)flexarray_get(&object->bookmark.children, + 0); + l = (struct pdf_object *)flexarray_get(&object->bookmark.children, + nchildren - 1); + fprintf(fp, " /First %d 0 R\r\n", f->index); + fprintf(fp, " /Last %d 0 R\r\n", l->index); + fprintf(fp, " /Count %d\r\n", pdf_get_bookmark_count(object)); + } + // Find the previous bookmark with the same parent + for (other = object->prev; + other && other->bookmark.parent != object->bookmark.parent; + other = other->prev) + ; + if (other) + fprintf(fp, " /Prev %d 0 R\r\n", other->index); + // Find the next bookmark with the same parent + for (other = object->next; + other && other->bookmark.parent != object->bookmark.parent; + other = other->next) + ; + if (other) + fprintf(fp, " /Next %d 0 R\r\n", other->index); + fprintf(fp, ">>\r\n"); + break; + } + + case OBJ_outline: { + struct pdf_object *first, *last, *cur; + first = pdf_find_first_object(pdf, OBJ_bookmark); + last = pdf_find_last_object(pdf, OBJ_bookmark); + + if (first && last) { + int count = 0; + cur = first; + while (cur) { + if (!cur->bookmark.parent) + count += pdf_get_bookmark_count(cur) + 1; + cur = cur->next; + } + + /* Bookmark outline */ + fprintf(fp, + "<<\r\n" + " /Count %d\r\n" + " /Type /Outlines\r\n" + " /First %d 0 R\r\n" + " /Last %d 0 R\r\n" + ">>\r\n", + count, first->index, last->index); + } + break; + } + + case OBJ_font: + fprintf(fp, + "<<\r\n" + " /Type /Font\r\n" + " /Subtype /Type1\r\n" + " /BaseFont /%s\r\n" + " /Encoding /WinAnsiEncoding\r\n" + ">>\r\n", + object->font.name); + break; + + case OBJ_pages: { + int npages = 0; + + fprintf(fp, "<<\r\n" + " /Type /Pages\r\n" + " /Kids [ "); + for (struct pdf_object *page = pdf_find_first_object(pdf, OBJ_page); + page; page = page->next) { + npages++; + fprintf(fp, "%d 0 R ", page->index); + } + fprintf(fp, "]\r\n"); + fprintf(fp, " /Count %d\r\n", npages); + fprintf(fp, ">>\r\n"); + break; + } + + case OBJ_catalog: { + struct pdf_object *outline = pdf_find_first_object(pdf, OBJ_outline); + struct pdf_object *pages = pdf_find_first_object(pdf, OBJ_pages); + + fprintf(fp, "<<\r\n" + " /Type /Catalog\r\n"); + if (outline) + fprintf(fp, + " /Outlines %d 0 R\r\n" + " /PageMode /UseOutlines\r\n", + outline->index); + fprintf(fp, + " /Pages %d 0 R\r\n" + ">>\r\n", + pages->index); + break; + } + + case OBJ_link: { + fprintf(fp, + "<<\r\n" + " /Type /Annot\r\n" + " /Subtype /Link\r\n" + " /Rect [%f %f %f %f]\r\n" + " /Dest [%u 0 R /XYZ %f %f null]\r\n" + " /Border [0 0 0]\r\n" + ">>\r\n", + object->link.llx, object->link.lly, object->link.urx, + object->link.ury, object->link.target_page->index, + object->link.target_x, object->link.target_y); + break; + } + + default: + return pdf_set_err(pdf, -EINVAL, "Invalid PDF object type %d", + object->type); + } + + fprintf(fp, "endobj\r\n"); + + return 0; +} + +// Slightly modified djb2 hash algorithm to get pseudo-random ID +static uint64_t hash(uint64_t hash, const void *data, size_t len) +{ + const uint8_t *d8 = (const uint8_t *)data; + for (; len; len--) { + hash = (((hash & 0x03ffffffffffffff) << 5) + + (hash & 0x7fffffffffffffff)) + + *d8++; + } + return hash; +} + +int pdf_save_file(struct pdf_doc *pdf, FILE *fp) +{ + struct pdf_object *obj; + int xref_offset; + int xref_count = 0; + uint64_t id1, id2; + time_t now = time(NULL); + char saved_locale[32]; + + force_locale(saved_locale, sizeof(saved_locale)); + + fprintf(fp, "%%PDF-1.3\r\n"); + /* Hibit bytes */ + fprintf(fp, "%c%c%c%c%c\r\n", 0x25, 0xc7, 0xec, 0x8f, 0xa2); + + /* Dump all the objects & get their file offsets */ + for (int i = 0; i < flexarray_size(&pdf->objects); i++) + if (pdf_save_object(pdf, fp, i) >= 0) + xref_count++; + + /* xref */ + xref_offset = ftell(fp); + fprintf(fp, "xref\r\n"); + fprintf(fp, "0 %d\r\n", xref_count + 1); + fprintf(fp, "0000000000 65535 f\r\n"); + for (int i = 0; i < flexarray_size(&pdf->objects); i++) { + obj = pdf_get_object(pdf, i); + if (obj->type != OBJ_none) + fprintf(fp, "%10.10d 00000 n\r\n", obj->offset); + } + + fprintf(fp, + "trailer\r\n" + "<<\r\n" + "/Size %d\r\n", + xref_count + 1); + obj = pdf_find_first_object(pdf, OBJ_catalog); + fprintf(fp, "/Root %d 0 R\r\n", obj->index); + obj = pdf_find_first_object(pdf, OBJ_info); + fprintf(fp, "/Info %d 0 R\r\n", obj->index); + /* Generate document unique IDs */ + id1 = hash(5381, obj->info, sizeof(struct pdf_info)); + id1 = hash(id1, &xref_count, sizeof(xref_count)); + id2 = hash(5381, &now, sizeof(now)); + fprintf(fp, "/ID [<%16.16" PRIx64 "> <%16.16" PRIx64 ">]\r\n", id1, id2); + fprintf(fp, ">>\r\n" + "startxref\r\n"); + fprintf(fp, "%d\r\n", xref_offset); + fprintf(fp, "%%%%EOF\r\n"); + + restore_locale(saved_locale); + + return 0; +} + +int pdf_save(struct pdf_doc *pdf, const char *filename) +{ + FILE *fp; + int e; + + if (filename == NULL) + fp = stdout; + else if ((fp = fopen(filename, "wb")) == NULL) + return pdf_set_err(pdf, -errno, "Unable to open '%s': %s", filename, + strerror(errno)); + + e = pdf_save_file(pdf, fp); + + if (fp != stdout) + if (fclose(fp) != 0 && e >= 0) + return pdf_set_err(pdf, -errno, "Unable to close '%s': %s", + filename, strerror(errno)); + + return e; +} + +static int pdf_add_stream(struct pdf_doc *pdf, struct pdf_object *page, + const char *buffer) +{ + struct pdf_object *obj; + size_t len; + + if (!page) + page = pdf_find_last_object(pdf, OBJ_page); + + if (!page) + return pdf_set_err(pdf, -EINVAL, "Invalid pdf page"); + + len = strlen(buffer); + /* We don't want any trailing whitespace in the stream */ + while (len >= 1 && (buffer[len - 1] == '\r' || buffer[len - 1] == '\n')) + len--; + + obj = pdf_add_object(pdf, OBJ_stream); + if (!obj) + return pdf->errval; + + dstr_printf(&obj->stream, "<< /Length %zu >>stream\r\n", len); + dstr_append_data(&obj->stream, buffer, len); + dstr_append(&obj->stream, "\r\nendstream\r\n"); + + return flexarray_append(&page->page.children, obj); +} + +int pdf_add_bookmark(struct pdf_doc *pdf, struct pdf_object *page, int parent, + const char *name) +{ + struct pdf_object *obj, *outline = NULL; + + if (!page) + page = pdf_find_last_object(pdf, OBJ_page); + + if (!page) + return pdf_set_err(pdf, -EINVAL, + "Unable to add bookmark, no pages available"); + + if (!pdf_find_first_object(pdf, OBJ_outline)) { + outline = pdf_add_object(pdf, OBJ_outline); + if (!outline) + return pdf->errval; + } + + obj = pdf_add_object(pdf, OBJ_bookmark); + if (!obj) { + if (outline) + pdf_del_object(pdf, outline); + return pdf->errval; + } + + strncpy(obj->bookmark.name, name, sizeof(obj->bookmark.name) - 1); + obj->bookmark.name[sizeof(obj->bookmark.name) - 1] = '\0'; + obj->bookmark.page = page; + if (parent >= 0) { + struct pdf_object *parent_obj = pdf_get_object(pdf, parent); + if (!parent_obj) + return pdf_set_err(pdf, -EINVAL, "Invalid parent ID %d supplied", + parent); + obj->bookmark.parent = parent_obj; + flexarray_append(&parent_obj->bookmark.children, obj); + } + + return obj->index; +} + +int pdf_add_link(struct pdf_doc *pdf, struct pdf_object *page, float x, + float y, float width, float height, + struct pdf_object *target_page, float target_x, + float target_y) +{ + struct pdf_object *obj; + + if (!page) + page = pdf_find_last_object(pdf, OBJ_page); + + if (!page) + return pdf_set_err(pdf, -EINVAL, + "Unable to add link, no pages available"); + + if (!target_page) + return pdf_set_err(pdf, -EINVAL, "Unable to link, no target page"); + + obj = pdf_add_object(pdf, OBJ_link); + if (!obj) { + return pdf->errval; + } + + obj->link.target_page = target_page; + obj->link.target_x = target_x; + obj->link.target_y = target_y; + obj->link.llx = x; + obj->link.lly = y; + obj->link.urx = x + width; + obj->link.ury = y + height; + flexarray_append(&page->page.annotations, obj); + + return obj->index; +} + +static int utf8_to_utf32(const char *utf8, int len, uint32_t *utf32) +{ + uint32_t ch; + uint8_t mask; + + if (len <= 0 || !utf8 || !utf32) + return -EINVAL; + + ch = *(uint8_t *)utf8; + if ((ch & 0x80) == 0) { + len = 1; + mask = 0x7f; + } else if ((ch & 0xe0) == 0xc0 && len >= 2) { + len = 2; + mask = 0x1f; + } else if ((ch & 0xf0) == 0xe0 && len >= 3) { + len = 3; + mask = 0xf; + } else if ((ch & 0xf8) == 0xf0 && len >= 4) { + len = 4; + mask = 0x7; + } else + return -EINVAL; + + ch = 0; + for (int i = 0; i < len; i++) { + int shift = (len - i - 1) * 6; + if (!*utf8) + return -EINVAL; + if (i == 0) + ch |= ((uint32_t)(*utf8++) & mask) << shift; + else + ch |= ((uint32_t)(*utf8++) & 0x3f) << shift; + } + + *utf32 = ch; + + return len; +} + +static int utf8_to_pdfencoding(struct pdf_doc *pdf, const char *utf8, int len, + uint8_t *res) +{ + uint32_t code; + int code_len; + + *res = 0; + + code_len = utf8_to_utf32(utf8, len, &code); + if (code_len < 0) { + return pdf_set_err(pdf, -EINVAL, "Invalid UTF-8 encoding"); + } + + if (code > 255) { + /* We support *some* minimal UTF-8 characters */ + // See Appendix D of + // https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/pdf_reference_archives/PDFReference.pdf + // These are all in WinAnsiEncoding + switch (code) { + case 0x160: // Latin Capital Letter S with Caron + *res = 0212; + break; + case 0x161: // Latin Small Letter S with Caron + *res = 0232; + break; + case 0x17d: // Latin Capital Letter Z with Caron + *res = 0216; + break; + case 0x17e: // Latin Small Letter Z with Caron + *res = 0236; + break; + case 0x2014: // emdash + *res = 0227; + break; + case 0x2018: // left single quote + *res = 0221; + break; + case 0x2019: // right single quote + *res = 0222; + break; + case 0x201c: // left double quote + *res = 0223; + break; + case 0x201d: // right double quote + *res = 0224; + break; + case 0x20ac: // Euro + *res = 0200; + break; + default: + return pdf_set_err(pdf, -EINVAL, + "Unsupported UTF-8 character: 0x%x 0o%o", code, + code); + } + } else { + *res = code; + } + return code_len; +} + +static int pdf_add_text_spacing(struct pdf_doc *pdf, struct pdf_object *page, + const char *text, float size, float xoff, + float yoff, uint32_t colour, float spacing) +{ + int ret; + size_t len = text ? strlen(text) : 0; + struct dstr str = INIT_DSTR; + int alpha = (colour >> 24) >> 4; + + /* Don't bother adding empty/null strings */ + if (!len) + return 0; + + dstr_append(&str, "BT "); + dstr_printf(&str, "/GS%d gs ", alpha); + dstr_printf(&str, "%f %f TD ", xoff, yoff); + dstr_printf(&str, "/F%d %f Tf ", pdf->current_font->font.index, size); + dstr_printf(&str, "%f %f %f rg ", PDF_RGB_R(colour), PDF_RGB_G(colour), + PDF_RGB_B(colour)); + dstr_printf(&str, "%f Tc ", spacing); + dstr_append(&str, "("); + + /* Escape magic characters properly */ + for (size_t i = 0; i < len;) { + int code_len; + uint8_t pdf_char; + code_len = utf8_to_pdfencoding(pdf, &text[i], len - i, &pdf_char); + if (code_len < 0) { + dstr_free(&str); + return code_len; + } + + if (strchr("()\\", pdf_char)) { + char buf[3]; + /* Escape some characters */ + buf[0] = '\\'; + buf[1] = pdf_char; + buf[2] = '\0'; + dstr_append(&str, buf); + } else if (strrchr("\n\r\t\b\f", pdf_char)) { + /* Skip over these characters */ + ; + } else { + dstr_append_data(&str, &pdf_char, 1); + } + + i += code_len; + } + dstr_append(&str, ") Tj "); + dstr_append(&str, "ET"); + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + return ret; +} + +int pdf_add_text(struct pdf_doc *pdf, struct pdf_object *page, + const char *text, float size, float xoff, float yoff, + uint32_t colour) +{ + return pdf_add_text_spacing(pdf, page, text, size, xoff, yoff, colour, 0); +} + +/* How wide is each character, in points, at size 14 */ +static const uint16_t helvetica_widths[256] = { + 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, + 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, + 280, 280, 280, 280, 280, 280, 280, 280, 357, 560, 560, 896, 672, + 192, 335, 335, 392, 588, 280, 335, 280, 280, 560, 560, 560, 560, + 560, 560, 560, 560, 560, 560, 280, 280, 588, 588, 588, 560, 1023, + 672, 672, 727, 727, 672, 615, 784, 727, 280, 504, 672, 560, 839, + 727, 784, 672, 784, 727, 672, 615, 727, 672, 951, 672, 672, 615, + 280, 280, 280, 472, 560, 335, 560, 560, 504, 560, 560, 280, 560, + 560, 223, 223, 504, 223, 839, 560, 560, 560, 560, 335, 504, 280, + 560, 504, 727, 504, 504, 504, 336, 262, 336, 588, 352, 560, 352, + 223, 560, 335, 1008, 560, 560, 335, 1008, 672, 335, 1008, 352, 615, + 352, 352, 223, 223, 335, 335, 352, 560, 1008, 335, 1008, 504, 335, + 951, 352, 504, 672, 280, 335, 560, 560, 560, 560, 262, 560, 335, + 742, 372, 560, 588, 335, 742, 335, 403, 588, 335, 335, 335, 560, + 541, 280, 335, 335, 367, 560, 840, 840, 840, 615, 672, 672, 672, + 672, 672, 672, 1008, 727, 672, 672, 672, 672, 280, 280, 280, 280, + 727, 727, 784, 784, 784, 784, 784, 588, 784, 727, 727, 727, 727, + 672, 672, 615, 560, 560, 560, 560, 560, 560, 896, 504, 560, 560, + 560, 560, 280, 280, 280, 280, 560, 560, 560, 560, 560, 560, 560, + 588, 615, 560, 560, 560, 560, 504, 560, 504, +}; + +static const uint16_t helvetica_bold_widths[256] = { + 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, + 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, + 280, 280, 280, 280, 280, 335, 477, 560, 560, 896, 727, 239, 335, 335, + 392, 588, 280, 335, 280, 280, 560, 560, 560, 560, 560, 560, 560, 560, + 560, 560, 335, 335, 588, 588, 588, 615, 982, 727, 727, 727, 727, 672, + 615, 784, 727, 280, 560, 727, 615, 839, 727, 784, 672, 784, 727, 672, + 615, 727, 672, 951, 672, 672, 615, 335, 280, 335, 588, 560, 335, 560, + 615, 560, 615, 560, 335, 615, 615, 280, 280, 560, 280, 896, 615, 615, + 615, 615, 392, 560, 335, 615, 560, 784, 560, 560, 504, 392, 282, 392, + 588, 352, 560, 352, 280, 560, 504, 1008, 560, 560, 335, 1008, 672, 335, + 1008, 352, 615, 352, 352, 280, 280, 504, 504, 352, 560, 1008, 335, 1008, + 560, 335, 951, 352, 504, 672, 280, 335, 560, 560, 560, 560, 282, 560, + 335, 742, 372, 560, 588, 335, 742, 335, 403, 588, 335, 335, 335, 615, + 560, 280, 335, 335, 367, 560, 840, 840, 840, 615, 727, 727, 727, 727, + 727, 727, 1008, 727, 672, 672, 672, 672, 280, 280, 280, 280, 727, 727, + 784, 784, 784, 784, 784, 588, 784, 727, 727, 727, 727, 672, 672, 615, + 560, 560, 560, 560, 560, 560, 896, 560, 560, 560, 560, 560, 280, 280, + 280, 280, 615, 615, 615, 615, 615, 615, 615, 588, 615, 615, 615, 615, + 615, 560, 615, 560, +}; + +static const uint16_t helvetica_bold_oblique_widths[256] = { + 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, + 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, + 280, 280, 280, 280, 280, 335, 477, 560, 560, 896, 727, 239, 335, 335, + 392, 588, 280, 335, 280, 280, 560, 560, 560, 560, 560, 560, 560, 560, + 560, 560, 335, 335, 588, 588, 588, 615, 982, 727, 727, 727, 727, 672, + 615, 784, 727, 280, 560, 727, 615, 839, 727, 784, 672, 784, 727, 672, + 615, 727, 672, 951, 672, 672, 615, 335, 280, 335, 588, 560, 335, 560, + 615, 560, 615, 560, 335, 615, 615, 280, 280, 560, 280, 896, 615, 615, + 615, 615, 392, 560, 335, 615, 560, 784, 560, 560, 504, 392, 282, 392, + 588, 352, 560, 352, 280, 560, 504, 1008, 560, 560, 335, 1008, 672, 335, + 1008, 352, 615, 352, 352, 280, 280, 504, 504, 352, 560, 1008, 335, 1008, + 560, 335, 951, 352, 504, 672, 280, 335, 560, 560, 560, 560, 282, 560, + 335, 742, 372, 560, 588, 335, 742, 335, 403, 588, 335, 335, 335, 615, + 560, 280, 335, 335, 367, 560, 840, 840, 840, 615, 727, 727, 727, 727, + 727, 727, 1008, 727, 672, 672, 672, 672, 280, 280, 280, 280, 727, 727, + 784, 784, 784, 784, 784, 588, 784, 727, 727, 727, 727, 672, 672, 615, + 560, 560, 560, 560, 560, 560, 896, 560, 560, 560, 560, 560, 280, 280, + 280, 280, 615, 615, 615, 615, 615, 615, 615, 588, 615, 615, 615, 615, + 615, 560, 615, 560, +}; + +static const uint16_t helvetica_oblique_widths[256] = { + 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, + 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, + 280, 280, 280, 280, 280, 280, 280, 280, 357, 560, 560, 896, 672, + 192, 335, 335, 392, 588, 280, 335, 280, 280, 560, 560, 560, 560, + 560, 560, 560, 560, 560, 560, 280, 280, 588, 588, 588, 560, 1023, + 672, 672, 727, 727, 672, 615, 784, 727, 280, 504, 672, 560, 839, + 727, 784, 672, 784, 727, 672, 615, 727, 672, 951, 672, 672, 615, + 280, 280, 280, 472, 560, 335, 560, 560, 504, 560, 560, 280, 560, + 560, 223, 223, 504, 223, 839, 560, 560, 560, 560, 335, 504, 280, + 560, 504, 727, 504, 504, 504, 336, 262, 336, 588, 352, 560, 352, + 223, 560, 335, 1008, 560, 560, 335, 1008, 672, 335, 1008, 352, 615, + 352, 352, 223, 223, 335, 335, 352, 560, 1008, 335, 1008, 504, 335, + 951, 352, 504, 672, 280, 335, 560, 560, 560, 560, 262, 560, 335, + 742, 372, 560, 588, 335, 742, 335, 403, 588, 335, 335, 335, 560, + 541, 280, 335, 335, 367, 560, 840, 840, 840, 615, 672, 672, 672, + 672, 672, 672, 1008, 727, 672, 672, 672, 672, 280, 280, 280, 280, + 727, 727, 784, 784, 784, 784, 784, 588, 784, 727, 727, 727, 727, + 672, 672, 615, 560, 560, 560, 560, 560, 560, 896, 504, 560, 560, + 560, 560, 280, 280, 280, 280, 560, 560, 560, 560, 560, 560, 560, + 588, 615, 560, 560, 560, 560, 504, 560, 504, +}; + +static const uint16_t symbol_widths[256] = { + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 335, 718, 504, 553, 839, 784, 442, 335, 335, + 504, 553, 252, 553, 252, 280, 504, 504, 504, 504, 504, 504, 504, 504, + 504, 504, 280, 280, 553, 553, 553, 447, 553, 727, 672, 727, 616, 615, + 769, 607, 727, 335, 636, 727, 691, 896, 727, 727, 774, 746, 560, 596, + 615, 695, 442, 774, 650, 801, 615, 335, 869, 335, 663, 504, 504, 636, + 553, 553, 497, 442, 525, 414, 607, 331, 607, 553, 553, 580, 525, 553, + 553, 525, 553, 607, 442, 580, 718, 691, 496, 691, 497, 483, 201, 483, + 553, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 756, 624, 248, 553, 168, 718, 504, 759, + 759, 759, 759, 1050, 994, 607, 994, 607, 403, 553, 414, 553, 553, 718, + 497, 463, 553, 553, 553, 553, 1008, 607, 1008, 663, 829, 691, 801, 994, + 774, 774, 829, 774, 774, 718, 718, 718, 718, 718, 718, 718, 774, 718, + 796, 796, 897, 829, 553, 252, 718, 607, 607, 1050, 994, 607, 994, 607, + 497, 331, 796, 796, 792, 718, 387, 387, 387, 387, 387, 387, 497, 497, + 497, 497, 0, 331, 276, 691, 691, 691, 387, 387, 387, 387, 387, 387, + 497, 497, 497, 0, +}; + +static const uint16_t times_widths[256] = { + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 335, 411, 504, 504, 839, 784, 181, 335, 335, + 504, 568, 252, 335, 252, 280, 504, 504, 504, 504, 504, 504, 504, 504, + 504, 504, 280, 280, 568, 568, 568, 447, 928, 727, 672, 672, 727, 615, + 560, 727, 727, 335, 392, 727, 615, 896, 727, 727, 560, 727, 672, 560, + 615, 727, 727, 951, 727, 727, 615, 335, 280, 335, 472, 504, 335, 447, + 504, 447, 504, 447, 335, 504, 504, 280, 280, 504, 280, 784, 504, 504, + 504, 504, 335, 392, 280, 504, 504, 727, 504, 504, 447, 483, 201, 483, + 545, 352, 504, 352, 335, 504, 447, 1008, 504, 504, 335, 1008, 560, 335, + 896, 352, 615, 352, 352, 335, 335, 447, 447, 352, 504, 1008, 335, 987, + 392, 335, 727, 352, 447, 727, 252, 335, 504, 504, 504, 504, 201, 504, + 335, 766, 278, 504, 568, 335, 766, 335, 403, 568, 302, 302, 335, 504, + 456, 252, 335, 302, 312, 504, 756, 756, 756, 447, 727, 727, 727, 727, + 727, 727, 896, 672, 615, 615, 615, 615, 335, 335, 335, 335, 727, 727, + 727, 727, 727, 727, 727, 568, 727, 727, 727, 727, 727, 727, 560, 504, + 447, 447, 447, 447, 447, 447, 672, 447, 447, 447, 447, 447, 280, 280, + 280, 280, 504, 504, 504, 504, 504, 504, 504, 568, 504, 504, 504, 504, + 504, 504, 504, 504, +}; + +static const uint16_t times_bold_widths[256] = { + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 335, 559, 504, 504, 1008, 839, + 280, 335, 335, 504, 574, 252, 335, 252, 280, 504, 504, 504, 504, + 504, 504, 504, 504, 504, 504, 335, 335, 574, 574, 574, 504, 937, + 727, 672, 727, 727, 672, 615, 784, 784, 392, 504, 784, 672, 951, + 727, 784, 615, 784, 727, 560, 672, 727, 727, 1008, 727, 727, 672, + 335, 280, 335, 585, 504, 335, 504, 560, 447, 560, 447, 335, 504, + 560, 280, 335, 560, 280, 839, 560, 504, 560, 560, 447, 392, 335, + 560, 504, 727, 504, 504, 447, 397, 221, 397, 524, 352, 504, 352, + 335, 504, 504, 1008, 504, 504, 335, 1008, 560, 335, 1008, 352, 672, + 352, 352, 335, 335, 504, 504, 352, 504, 1008, 335, 1008, 392, 335, + 727, 352, 447, 727, 252, 335, 504, 504, 504, 504, 221, 504, 335, + 752, 302, 504, 574, 335, 752, 335, 403, 574, 302, 302, 335, 560, + 544, 252, 335, 302, 332, 504, 756, 756, 756, 504, 727, 727, 727, + 727, 727, 727, 1008, 727, 672, 672, 672, 672, 392, 392, 392, 392, + 727, 727, 784, 784, 784, 784, 784, 574, 784, 727, 727, 727, 727, + 727, 615, 560, 504, 504, 504, 504, 504, 504, 727, 447, 447, 447, + 447, 447, 280, 280, 280, 280, 504, 560, 504, 504, 504, 504, 504, + 574, 504, 560, 560, 560, 560, 504, 560, 504, +}; + +static const uint16_t times_bold_italic_widths[256] = { + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 392, 559, 504, 504, 839, 784, 280, 335, 335, + 504, 574, 252, 335, 252, 280, 504, 504, 504, 504, 504, 504, 504, 504, + 504, 504, 335, 335, 574, 574, 574, 504, 838, 672, 672, 672, 727, 672, + 672, 727, 784, 392, 504, 672, 615, 896, 727, 727, 615, 727, 672, 560, + 615, 727, 672, 896, 672, 615, 615, 335, 280, 335, 574, 504, 335, 504, + 504, 447, 504, 447, 335, 504, 560, 280, 280, 504, 280, 784, 560, 504, + 504, 504, 392, 392, 280, 560, 447, 672, 504, 447, 392, 350, 221, 350, + 574, 352, 504, 352, 335, 504, 504, 1008, 504, 504, 335, 1008, 560, 335, + 951, 352, 615, 352, 352, 335, 335, 504, 504, 352, 504, 1008, 335, 1008, + 392, 335, 727, 352, 392, 615, 252, 392, 504, 504, 504, 504, 221, 504, + 335, 752, 268, 504, 610, 335, 752, 335, 403, 574, 302, 302, 335, 580, + 504, 252, 335, 302, 302, 504, 756, 756, 756, 504, 672, 672, 672, 672, + 672, 672, 951, 672, 672, 672, 672, 672, 392, 392, 392, 392, 727, 727, + 727, 727, 727, 727, 727, 574, 727, 727, 727, 727, 727, 615, 615, 504, + 504, 504, 504, 504, 504, 504, 727, 447, 447, 447, 447, 447, 280, 280, + 280, 280, 504, 560, 504, 504, 504, 504, 504, 574, 504, 560, 560, 560, + 560, 447, 504, 447, +}; + +static const uint16_t times_italic_widths[256] = { + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, + 252, 252, 252, 252, 252, 335, 423, 504, 504, 839, 784, 215, 335, 335, + 504, 680, 252, 335, 252, 280, 504, 504, 504, 504, 504, 504, 504, 504, + 504, 504, 335, 335, 680, 680, 680, 504, 927, 615, 615, 672, 727, 615, + 615, 727, 727, 335, 447, 672, 560, 839, 672, 727, 615, 727, 615, 504, + 560, 727, 615, 839, 615, 560, 560, 392, 280, 392, 425, 504, 335, 504, + 504, 447, 504, 447, 280, 504, 504, 280, 280, 447, 280, 727, 504, 504, + 504, 504, 392, 392, 280, 504, 447, 672, 447, 447, 392, 403, 277, 403, + 545, 352, 504, 352, 335, 504, 560, 896, 504, 504, 335, 1008, 504, 335, + 951, 352, 560, 352, 352, 335, 335, 560, 560, 352, 504, 896, 335, 987, + 392, 335, 672, 352, 392, 560, 252, 392, 504, 504, 504, 504, 277, 504, + 335, 766, 278, 504, 680, 335, 766, 335, 403, 680, 302, 302, 335, 504, + 527, 252, 335, 302, 312, 504, 756, 756, 756, 504, 615, 615, 615, 615, + 615, 615, 896, 672, 615, 615, 615, 615, 335, 335, 335, 335, 727, 672, + 727, 727, 727, 727, 727, 680, 727, 727, 727, 727, 727, 560, 615, 504, + 504, 504, 504, 504, 504, 504, 672, 447, 447, 447, 447, 447, 280, 280, + 280, 280, 504, 504, 504, 504, 504, 504, 504, 680, 504, 504, 504, 504, + 504, 447, 504, 447, +}; + +static const uint16_t zapfdingbats_widths[256] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 280, 981, 968, 981, 987, 724, 795, 796, 797, 695, + 967, 946, 553, 861, 918, 940, 918, 952, 981, 761, 852, 768, 767, 575, + 682, 769, 766, 765, 760, 497, 556, 541, 581, 697, 792, 794, 794, 796, + 799, 800, 822, 829, 795, 847, 829, 839, 822, 837, 930, 749, 728, 754, + 796, 798, 700, 782, 774, 798, 765, 712, 713, 687, 706, 832, 821, 795, + 795, 712, 692, 701, 694, 792, 793, 718, 797, 791, 797, 879, 767, 768, + 768, 765, 765, 899, 899, 794, 790, 441, 139, 279, 418, 395, 395, 673, + 673, 0, 393, 393, 319, 319, 278, 278, 513, 513, 413, 413, 235, 235, + 336, 336, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 737, 548, 548, 917, 672, 766, 766, + 782, 599, 699, 631, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, + 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, + 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, 794, + 794, 794, 901, 844, 1024, 461, 753, 931, 753, 925, 934, 935, 935, 840, + 879, 834, 931, 931, 924, 937, 938, 466, 890, 842, 842, 873, 873, 701, + 701, 880, 0, 880, 766, 953, 777, 871, 777, 895, 974, 895, 837, 879, + 934, 977, 925, 0, +}; + +static const uint16_t courier_widths[256] = { + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, 604, + 604, +}; + +static int pdf_text_point_width(struct pdf_doc *pdf, const char *text, + ptrdiff_t text_len, float size, + const uint16_t *widths, float *point_width) +{ + uint32_t len = 0; + if (text_len < 0) + text_len = strlen(text); + *point_width = 0.0f; + + for (int i = 0; i < (int)text_len;) { + uint8_t pdf_char = 0; + int code_len; + code_len = + utf8_to_pdfencoding(pdf, &text[i], text_len - i, &pdf_char); + if (code_len < 0) + return pdf_set_err(pdf, code_len, + "Invalid unicode string at position %d in %s", + i, text); + i += code_len; + + if (pdf_char != '\n' && pdf_char != '\r') + len += widths[pdf_char]; + } + + /* Our widths arrays are for 14pt fonts */ + *point_width = len * size / (14.0f * 72.0f); + + return 0; +} + +static const uint16_t *find_font_widths(const char *font_name) +{ + if (strcasecmp(font_name, "Helvetica") == 0) + return helvetica_widths; + if (strcasecmp(font_name, "Helvetica-Bold") == 0) + return helvetica_bold_widths; + if (strcasecmp(font_name, "Helvetica-BoldOblique") == 0) + return helvetica_bold_oblique_widths; + if (strcasecmp(font_name, "Helvetica-Oblique") == 0) + return helvetica_oblique_widths; + if (strcasecmp(font_name, "Courier") == 0 || + strcasecmp(font_name, "Courier-Bold") == 0 || + strcasecmp(font_name, "Courier-BoldOblique") == 0 || + strcasecmp(font_name, "Courier-Oblique") == 0) + return courier_widths; + if (strcasecmp(font_name, "Times-Roman") == 0) + return times_widths; + if (strcasecmp(font_name, "Times-Bold") == 0) + return times_bold_widths; + if (strcasecmp(font_name, "Times-Italic") == 0) + return times_italic_widths; + if (strcasecmp(font_name, "Times-BoldItalic") == 0) + return times_bold_italic_widths; + if (strcasecmp(font_name, "Symbol") == 0) + return symbol_widths; + if (strcasecmp(font_name, "ZapfDingbats") == 0) + return zapfdingbats_widths; + + return NULL; +} + +int pdf_get_font_text_width(struct pdf_doc *pdf, const char *font_name, + const char *text, float size, float *text_width) +{ + if (!font_name) + font_name = pdf->current_font->font.name; + const uint16_t *widths = find_font_widths(font_name); + + if (!widths) + return pdf_set_err(pdf, -EINVAL, + "Unable to determine width for font '%s'", + pdf->current_font->font.name); + return pdf_text_point_width(pdf, text, -1, size, widths, text_width); +} + +static const char *find_word_break(const char *string) +{ + /* Skip over the actual word */ + while (string && *string && (*string < 0 || !isspace(*string))) + string++; + + return string; +} + +int pdf_add_text_wrap(struct pdf_doc *pdf, struct pdf_object *page, + const char *text, float size, float xoff, float yoff, + uint32_t colour, float wrap_width, int align, + float *height) +{ + /* Move through the text string, stopping at word boundaries, + * trying to find the longest text string we can fit in the given width + */ + const char *start = text; + const char *last_best = text; + const char *end = text; + char line[512]; + const uint16_t *widths; + float orig_yoff = yoff; + + widths = find_font_widths(pdf->current_font->font.name); + if (!widths) + return pdf_set_err(pdf, -EINVAL, + "Unable to determine width for font '%s'", + pdf->current_font->font.name); + + while (start && *start) { + const char *new_end = find_word_break(end + 1); + float line_width; + int output = 0; + float xoff_align = xoff; + int e; + + end = new_end; + + e = pdf_text_point_width(pdf, start, end - start, size, widths, + &line_width); + if (e < 0) + return e; + + if (line_width >= wrap_width) { + if (last_best == start) { + /* There is a single word that is too long for the line */ + ptrdiff_t i; + /* Find the best character to chop it at */ + for (i = end - start - 1; i > 0; i--) { + float this_width; + // Don't look at places that are in the middle of a utf-8 + // sequence + if ((start[i - 1] & 0xc0) == 0xc0 || + ((start[i - 1] & 0xc0) == 0x80 && + (start[i] & 0xc0) == 0x80)) + continue; + e = pdf_text_point_width(pdf, start, i, size, widths, + &this_width); + if (e < 0) + return e; + if (this_width < wrap_width) + break; + } + if (i == 0) + return pdf_set_err(pdf, -EINVAL, + "Unable to find suitable line break"); + + end = start + i; + } else + end = last_best; + output = 1; + } + if (*end == '\0') + output = 1; + + if (*end == '\n' || *end == '\r') + output = 1; + + if (output) { + int len = end - start; + float char_spacing = 0; + if (len >= (int)sizeof(line)) + len = (int)sizeof(line) - 1; + strncpy(line, start, len); + line[len] = '\0'; + + e = pdf_text_point_width(pdf, start, len, size, widths, + &line_width); + if (e < 0) + return e; + + switch (align) { + case PDF_ALIGN_RIGHT: + xoff_align += wrap_width - line_width; + break; + case PDF_ALIGN_CENTER: + xoff_align += (wrap_width - line_width) / 2; + break; + case PDF_ALIGN_JUSTIFY: + if ((len - 1) > 0 && *end != '\r' && *end != '\n' && + *end != '\0') + char_spacing = (wrap_width - line_width) / (len - 2); + break; + case PDF_ALIGN_JUSTIFY_ALL: + if ((len - 1) > 0) + char_spacing = (wrap_width - line_width) / (len - 2); + break; + } + + if (align != PDF_ALIGN_NO_WRITE) { + pdf_add_text_spacing(pdf, page, line, size, xoff_align, yoff, + colour, char_spacing); + } + + if (*end == ' ') + end++; + + start = last_best = end; + yoff -= size; + } else + last_best = end; + } + + if (height) + *height = orig_yoff - yoff; + return 0; +} + +int pdf_add_line(struct pdf_doc *pdf, struct pdf_object *page, float x1, + float y1, float x2, float y2, float width, uint32_t colour) +{ + int ret; + struct dstr str = INIT_DSTR; + + dstr_printf(&str, "%f w\r\n", width); + dstr_printf(&str, "%f %f m\r\n", x1, y1); + dstr_printf(&str, "/DeviceRGB CS\r\n"); + dstr_printf(&str, "%f %f %f RG\r\n", PDF_RGB_R(colour), PDF_RGB_G(colour), + PDF_RGB_B(colour)); + dstr_printf(&str, "%f %f l S\r\n", x2, y2); + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + + return ret; +} + +int pdf_add_cubic_bezier(struct pdf_doc *pdf, struct pdf_object *page, + float x1, float y1, float x2, float y2, float xq1, + float yq1, float xq2, float yq2, float width, + uint32_t colour) +{ + int ret; + struct dstr str = INIT_DSTR; + + dstr_printf(&str, "%f w\r\n", width); + dstr_printf(&str, "%f %f m\r\n", x1, y1); + dstr_printf(&str, "/DeviceRGB CS\r\n"); + dstr_printf(&str, "%f %f %f RG\r\n", PDF_RGB_R(colour), PDF_RGB_G(colour), + PDF_RGB_B(colour)); + dstr_printf(&str, "%f %f %f %f %f %f c S\r\n", xq1, yq1, xq2, yq2, x2, + y2); + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + + return ret; +} + +int pdf_add_quadratic_bezier(struct pdf_doc *pdf, struct pdf_object *page, + float x1, float y1, float x2, float y2, + float xq1, float yq1, float width, + uint32_t colour) +{ + float xc1 = x1 + (xq1 - x1) * (2.0f / 3.0f); + float yc1 = y1 + (yq1 - y1) * (2.0f / 3.0f); + float xc2 = x2 + (xq1 - x2) * (2.0f / 3.0f); + float yc2 = y2 + (yq1 - y2) * (2.0f / 3.0f); + return pdf_add_cubic_bezier(pdf, page, x1, y1, x2, y2, xc1, yc1, xc2, yc2, + width, colour); +} + +int pdf_add_custom_path(struct pdf_doc *pdf, struct pdf_object *page, + struct pdf_path_operation *operations, + int operation_count, float stroke_width, + uint32_t stroke_colour, uint32_t fill_colour) +{ + int ret; + struct dstr str = INIT_DSTR; + + if (!PDF_IS_TRANSPARENT(fill_colour)) { + dstr_printf(&str, "/DeviceRGB CS\r\n"); + dstr_printf(&str, "%f %f %f rg\r\n", PDF_RGB_R(fill_colour), + PDF_RGB_G(fill_colour), PDF_RGB_B(fill_colour)); + } + dstr_printf(&str, "%f w\r\n", stroke_width); + dstr_printf(&str, "/DeviceRGB CS\r\n"); + dstr_printf(&str, "%f %f %f RG\r\n", PDF_RGB_R(stroke_colour), + PDF_RGB_G(stroke_colour), PDF_RGB_B(stroke_colour)); + + for (int i = 0; i < operation_count; i++) { + struct pdf_path_operation operation = operations[i]; + switch (operation.op) { + case 'm': + dstr_printf(&str, "%f %f m\r\n", operation.x1, operation.y1); + break; + case 'l': + dstr_printf(&str, "%f %f l\r\n", operation.x1, operation.y1); + break; + case 'c': + dstr_printf(&str, "%f %f %f %f %f %f c\r\n", operation.x1, + operation.y1, operation.x2, operation.y2, + operation.x3, operation.y3); + break; + case 'v': + dstr_printf(&str, "%f %f %f %f v\r\n", operation.x1, operation.y1, + operation.x2, operation.y2); + break; + case 'y': + dstr_printf(&str, "%f %f %f %f y\r\n", operation.x1, operation.y1, + operation.x2, operation.y2); + break; + case 'h': + dstr_printf(&str, "h\r\n"); + break; + default: + return pdf_set_err(pdf, -errno, "Invalid operation"); + break; + } + } + + if (PDF_IS_TRANSPARENT(fill_colour)) + dstr_printf(&str, "%s", "S "); + else + dstr_printf(&str, "%s", "B "); + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + + return ret; +} + +int pdf_add_ellipse(struct pdf_doc *pdf, struct pdf_object *page, float x, + float y, float xradius, float yradius, float width, + uint32_t colour, uint32_t fill_colour) +{ + int ret; + struct dstr str = INIT_DSTR; + float lx, ly; + + lx = (4.0f / 3.0f) * (M_SQRT2 - 1) * xradius; + ly = (4.0f / 3.0f) * (M_SQRT2 - 1) * yradius; + + if (!PDF_IS_TRANSPARENT(fill_colour)) { + dstr_printf(&str, "/DeviceRGB CS\r\n"); + dstr_printf(&str, "%f %f %f rg\r\n", PDF_RGB_R(fill_colour), + PDF_RGB_G(fill_colour), PDF_RGB_B(fill_colour)); + } + + /* stroke color */ + dstr_printf(&str, "/DeviceRGB CS\r\n"); + dstr_printf(&str, "%f %f %f RG\r\n", PDF_RGB_R(colour), PDF_RGB_G(colour), + PDF_RGB_B(colour)); + + dstr_printf(&str, "%f w ", width); + + dstr_printf(&str, "%.2f %.2f m ", (x + xradius), (y)); + + dstr_printf(&str, "%.2f %.2f %.2f %.2f %.2f %.2f c ", (x + xradius), + (y - ly), (x + lx), (y - yradius), x, (y - yradius)); + + dstr_printf(&str, "%.2f %.2f %.2f %.2f %.2f %.2f c ", (x - lx), + (y - yradius), (x - xradius), (y - ly), (x - xradius), y); + + dstr_printf(&str, "%.2f %.2f %.2f %.2f %.2f %.2f c ", (x - xradius), + (y + ly), (x - lx), (y + yradius), x, (y + yradius)); + + dstr_printf(&str, "%.2f %.2f %.2f %.2f %.2f %.2f c ", (x + lx), + (y + yradius), (x + xradius), (y + ly), (x + xradius), y); + + if (PDF_IS_TRANSPARENT(fill_colour)) + dstr_printf(&str, "%s", "S "); + else + dstr_printf(&str, "%s", "B "); + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + + return ret; +} + +int pdf_add_circle(struct pdf_doc *pdf, struct pdf_object *page, float xr, + float yr, float radius, float width, uint32_t colour, + uint32_t fill_colour) +{ + return pdf_add_ellipse(pdf, page, xr, yr, radius, radius, width, colour, + fill_colour); +} + +int pdf_add_rectangle(struct pdf_doc *pdf, struct pdf_object *page, float x, + float y, float width, float height, float border_width, + uint32_t colour) +{ + int ret; + struct dstr str = INIT_DSTR; + + dstr_printf(&str, "%f %f %f RG ", PDF_RGB_R(colour), PDF_RGB_G(colour), + PDF_RGB_B(colour)); + dstr_printf(&str, "%f w ", border_width); + dstr_printf(&str, "%f %f %f %f re S ", x, y, width, height); + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + + return ret; +} + +int pdf_add_filled_rectangle(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float width, float height, + float border_width, uint32_t colour_fill, + uint32_t colour_border) +{ + int ret; + struct dstr str = INIT_DSTR; + + dstr_printf(&str, "%f %f %f rg ", PDF_RGB_R(colour_fill), + PDF_RGB_G(colour_fill), PDF_RGB_B(colour_fill)); + if (border_width > 0) { + dstr_printf(&str, "%f %f %f RG ", PDF_RGB_R(colour_border), + PDF_RGB_G(colour_border), PDF_RGB_B(colour_border)); + dstr_printf(&str, "%f w ", border_width); + dstr_printf(&str, "%f %f %f %f re B ", x, y, width, height); + } else { + dstr_printf(&str, "%f %f %f %f re f ", x, y, width, height); + } + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + + return ret; +} + +int pdf_add_polygon(struct pdf_doc *pdf, struct pdf_object *page, float x[], + float y[], int count, float border_width, uint32_t colour) +{ + int ret; + struct dstr str = INIT_DSTR; + + dstr_printf(&str, "%f %f %f RG ", PDF_RGB_R(colour), PDF_RGB_G(colour), + PDF_RGB_B(colour)); + dstr_printf(&str, "%f w ", border_width); + dstr_printf(&str, "%f %f m ", x[0], y[0]); + for (int i = 1; i < count; i++) { + dstr_printf(&str, "%f %f l ", x[i], y[i]); + } + dstr_printf(&str, "h S "); + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + + return ret; +} + +int pdf_add_filled_polygon(struct pdf_doc *pdf, struct pdf_object *page, + float x[], float y[], int count, + float border_width, uint32_t colour) +{ + int ret; + struct dstr str = INIT_DSTR; + + dstr_printf(&str, "%f %f %f RG ", PDF_RGB_R(colour), PDF_RGB_G(colour), + PDF_RGB_B(colour)); + dstr_printf(&str, "%f %f %f rg ", PDF_RGB_R(colour), PDF_RGB_G(colour), + PDF_RGB_B(colour)); + dstr_printf(&str, "%f w ", border_width); + dstr_printf(&str, "%f %f m ", x[0], y[0]); + for (int i = 1; i < count; i++) { + dstr_printf(&str, "%f %f l ", x[i], y[i]); + } + dstr_printf(&str, "h f "); + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + + return ret; +} + +static const struct { + uint32_t code; + char ch; +} code_128a_encoding[] = { + {0x212222, ' '}, {0x222122, '!'}, {0x222221, '"'}, {0x121223, '#'}, + {0x121322, '$'}, {0x131222, '%'}, {0x122213, '&'}, {0x122312, '\''}, + {0x132212, '('}, {0x221213, ')'}, {0x221312, '*'}, {0x231212, '+'}, + {0x112232, ','}, {0x122132, '-'}, {0x122231, '.'}, {0x113222, '/'}, + {0x123122, '0'}, {0x123221, '1'}, {0x223211, '2'}, {0x221132, '3'}, + {0x221231, '4'}, {0x213212, '5'}, {0x223112, '6'}, {0x312131, '7'}, + {0x311222, '8'}, {0x321122, '9'}, {0x321221, ':'}, {0x312212, ';'}, + {0x322112, '<'}, {0x322211, '='}, {0x212123, '>'}, {0x212321, '?'}, + {0x232121, '@'}, {0x111323, 'A'}, {0x131123, 'B'}, {0x131321, 'C'}, + {0x112313, 'D'}, {0x132113, 'E'}, {0x132311, 'F'}, {0x211313, 'G'}, + {0x231113, 'H'}, {0x231311, 'I'}, {0x112133, 'J'}, {0x112331, 'K'}, + {0x132131, 'L'}, {0x113123, 'M'}, {0x113321, 'N'}, {0x133121, 'O'}, + {0x313121, 'P'}, {0x211331, 'Q'}, {0x231131, 'R'}, {0x213113, 'S'}, + {0x213311, 'T'}, {0x213131, 'U'}, {0x311123, 'V'}, {0x311321, 'W'}, + {0x331121, 'X'}, {0x312113, 'Y'}, {0x312311, 'Z'}, {0x332111, '['}, + {0x314111, '\\'}, {0x221411, ']'}, {0x431111, '^'}, {0x111224, '_'}, + {0x111422, '`'}, {0x121124, 'a'}, {0x121421, 'b'}, {0x141122, 'c'}, + {0x141221, 'd'}, {0x112214, 'e'}, {0x112412, 'f'}, {0x122114, 'g'}, + {0x122411, 'h'}, {0x142112, 'i'}, {0x142211, 'j'}, {0x241211, 'k'}, + {0x221114, 'l'}, {0x413111, 'm'}, {0x241112, 'n'}, {0x134111, 'o'}, + {0x111242, 'p'}, {0x121142, 'q'}, {0x121241, 'r'}, {0x114212, 's'}, + {0x124112, 't'}, {0x124211, 'u'}, {0x411212, 'v'}, {0x421112, 'w'}, + {0x421211, 'x'}, {0x212141, 'y'}, {0x214121, 'z'}, {0x412121, '{'}, + {0x111143, '|'}, {0x111341, '}'}, {0x131141, '~'}, {0x114113, '\0'}, + {0x114311, '\0'}, {0x411113, '\0'}, {0x411311, '\0'}, {0x113141, '\0'}, + {0x114131, '\0'}, {0x311141, '\0'}, {0x411131, '\0'}, {0x211412, '\0'}, + {0x211214, '\0'}, {0x211232, '\0'}, {0x2331112, '\0'}, +}; + +static int find_128_encoding(char ch) +{ + for (int i = 0; i < (int)ARRAY_SIZE(code_128a_encoding); i++) { + if (code_128a_encoding[i].ch == ch) + return i; + } + return -1; +} + +static float pdf_barcode_128a_ch(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float width, float height, + uint32_t colour, int index, int code_len) +{ + uint32_t code = code_128a_encoding[index].code; + float line_width = width / 11.0f; + + for (int i = 0; i < code_len; i++) { + uint8_t shift = (code_len - 1 - i) * 4; + uint8_t mask = (code >> shift) & 0xf; + + if (!(i % 2)) + pdf_add_filled_rectangle(pdf, page, x, y, line_width * mask, + height, 0, colour, PDF_TRANSPARENT); + x += line_width * mask; + } + return x; +} + +static int pdf_add_barcode_128a(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float width, float height, + const char *string, uint32_t colour) +{ + const char *s; + size_t len = strlen(string) + 3; + float char_width = width / len; + int checksum, i; + + if (char_width / 11.0f <= 0) + return pdf_set_err(pdf, -EINVAL, + "Insufficient width to draw barcode"); + + for (s = string; *s; s++) + if (find_128_encoding(*s) < 0) + return pdf_set_err(pdf, -EINVAL, "Invalid barcode character 0x%x", + *s); + + x = pdf_barcode_128a_ch(pdf, page, x, y, char_width, height, colour, 104, + 6); + checksum = 104; + + for (i = 1, s = string; *s; s++, i++) { + int index = find_128_encoding(*s); + // This should be impossible, due to the checks above, but confirm + // here anyway to stop coverity complaining + if (index < 0) + return pdf_set_err(pdf, -EINVAL, + "Invalid 128a barcode character 0x%x", *s); + x = pdf_barcode_128a_ch(pdf, page, x, y, char_width, height, colour, + index, 6); + checksum += index * i; + } + x = pdf_barcode_128a_ch(pdf, page, x, y, char_width, height, colour, + checksum % 103, 6); + pdf_barcode_128a_ch(pdf, page, x, y, char_width, height, colour, 106, 7); + return 0; +} + +/* Code 39 character encoding. Each 4-bit value indicates: + * 0 => wide bar + * 1 => narrow bar + * 2 => wide space + */ +static const struct { + int code; + char ch; +} code_39_encoding[] = { + {0x012110, '1'}, {0x102110, '2'}, {0x002111, '3'}, + {0x112010, '4'}, {0x012011, '5'}, {0x102011, '6'}, + {0x112100, '7'}, {0x012101, '8'}, {0x102101, '9'}, + {0x112001, '0'}, {0x011210, 'A'}, {0x101210, 'B'}, + {0x001211, 'C'}, {0x110210, 'D'}, {0x010211, 'E'}, + {0x100211, 'F'}, {0x111200, 'G'}, {0x011201, 'H'}, + {0x101201, 'I'}, {0x110201, 'J'}, {0x011120, 'K'}, + {0x101120, 'L'}, {0x001121, 'M'}, {0x110120, 'N'}, + {0x010121, 'O'}, {0x100121, 'P'}, {0x111020, 'Q'}, + {0x011021, 'R'}, {0x101021, 'S'}, {0x110021, 'T'}, + {0x021110, 'U'}, {0x120110, 'V'}, {0x020111, 'W'}, + {0x121010, 'X'}, {0x021011, 'Y'}, {0x120011, 'Z'}, + {0x121100, '-'}, {0x021101, '.'}, {0x120101, ' '}, + {0x121001, '*'}, // 'stop' character +}; + +static int find_39_encoding(char ch) +{ + for (int i = 0; i < (int)ARRAY_SIZE(code_39_encoding); i++) { + if (code_39_encoding[i].ch == ch) { + return code_39_encoding[i].code; + } + } + return -1; +} + +static int pdf_barcode_39_ch(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float char_width, float height, + uint32_t colour, char ch, float *new_x) +{ + float nw = char_width / 12.0f; + float ww = char_width / 4.0f; + int code = 0; + + code = find_39_encoding(ch); + if (code < 0) + return pdf_set_err(pdf, -EINVAL, "Invalid Code 39 character %c 0x%x", + ch, ch); + + for (int i = 5; i >= 0; i--) { + int pattern = (code >> i * 4) & 0xf; + if (pattern == 0) { // wide + if (pdf_add_filled_rectangle(pdf, page, x, y, ww - 1, height, 0, + colour, PDF_TRANSPARENT) < 0) + return pdf->errval; + x += ww; + } + if (pattern == 1) { // narrow + if (pdf_add_filled_rectangle(pdf, page, x, y, nw - 1, height, 0, + colour, PDF_TRANSPARENT) < 0) + return pdf->errval; + x += nw; + } + if (pattern == 2) { // space + x += nw; + } + } + if (new_x) + *new_x = x; + return 0; +} + +static int pdf_add_barcode_39(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float width, float height, + const char *string, uint32_t colour) +{ + size_t len = strlen(string); + float char_width = width / (len + 2); + int e; + + e = pdf_barcode_39_ch(pdf, page, x, y, char_width, height, colour, '*', + &x); + if (e < 0) + return e; + + while (string && *string) { + e = pdf_barcode_39_ch(pdf, page, x, y, char_width, height, colour, + *string, &x); + if (e < 0) + return e; + string++; + } + + e = pdf_barcode_39_ch(pdf, page, x, y, char_width, height, colour, '*', + NULL); + if (e < 0) + return e; + + return 0; +} + +/* EAN/UPC character encoding. Each 4-bit value indicates width in x units. + * Elements are SBSB (Space, Bar, Space, Bar) for LHS digits + * Elements are inverted for RHS digits + */ +static const int code_eanupc_encoding[] = { + 0x3211, // 0 + 0x2221, // 1 + 0x2122, // 2 + 0x1411, // 3 + 0x1132, // 4 + 0x1231, // 5 + 0x1114, // 6 + 0x1312, // 7 + 0x1213, // 8 + 0x3112, // 9 +}; + +/** + * List of different barcode guard patterns that are supported + */ +enum { + GUARD_NORMAL, //!< Produce normal guard pattern + GUARD_CENTRE, //!< Produce centre guard pattern + GUARD_SPECIAL, //!< Produce special guard pattern + GUARD_ADDON, + GUARD_ADDON_DELIN, +}; + +static const int code_eanupc_aux_encoding[] = { + 0x150, // Normal guard + 0x554, // Centre guard + 0x555, // Special guard + 0x160, // Add-on guard + 0x500, // Add-on delineator +}; + +static const int set_ean13_encoding[] = { + 0x00, // 0 + 0x34, // 1 + 0x2c, // 2 + 0x1c, // 3 + 0x32, // 4 + 0x26, // 5 + 0x0e, // 6 + 0x2a, // 7 + 0x1a, // 8 + 0x16, // 9 +}; + +static const int set_upce_encoding[] = { + 0x07, // 0 + 0x0b, // 1 + 0x13, // 2 + 0x23, // 3 + 0x0d, // 4 + 0x19, // 5 + 0x31, // 6 + 0x15, // 7 + 0x25, // 8 + 0x29, // 9 +}; + +#define EANUPC_X PDF_MM_TO_POINT(0.330f) + +static const struct { + unsigned modules; + float height_bar; + float height_outer; + unsigned quiet_left; + unsigned quiet_right; +} eanupc_dimensions[] = { + {113, PDF_MM_TO_POINT(22.85), PDF_MM_TO_POINT(25.93), 11, 7}, // EAN-13 + {113, PDF_MM_TO_POINT(22.85), PDF_MM_TO_POINT(25.93), 9, 9}, // UPC-A + {81, PDF_MM_TO_POINT(18.23), PDF_MM_TO_POINT(21.31), 7, 7}, // EAN-8 + {67, PDF_MM_TO_POINT(22.85), PDF_MM_TO_POINT(25.93), 9, 7}, // UPC-E +}; + +static void pdf_barcode_eanupc_calc_dims(int type, float width, float height, + float *x_off, float *y_off, + float *new_width, float *new_height, + float *x, float *bar_height, + float *bar_ext, float *font_size) +{ + float aspectBarcode, aspectRect, scale; + + aspectRect = width / height; + aspectBarcode = eanupc_dimensions[type - PDF_BARCODE_EAN13].modules * + EANUPC_X / + eanupc_dimensions[type - PDF_BARCODE_EAN13].height_outer; + if (aspectRect > aspectBarcode) { + *new_height = height; + *new_width = height * aspectBarcode; + } else if (aspectRect < aspectBarcode) { + *new_width = width; + *new_height = width / aspectBarcode; + } else { + *new_width = width; + *new_height = height; + } + scale = *new_height / + eanupc_dimensions[type - PDF_BARCODE_EAN13].height_outer; + + *x = *new_width / eanupc_dimensions[type - PDF_BARCODE_EAN13].modules; + *bar_ext = *x * 5; + *bar_height = + eanupc_dimensions[type - PDF_BARCODE_EAN13].height_bar * scale; + *font_size = 8.0 * scale; + *x_off = (width - *new_width) / 2.0; + *y_off = (height - *new_height) / 2.0; +} + +static int pdf_barcode_eanupc_ch(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float x_width, + float height, uint32_t colour, char ch, + int set, float *new_x) +{ + if ('0' > ch || ch > '9') + return pdf_set_err(pdf, -EINVAL, "Invalid EAN/UPC character %c 0x%x", + ch, ch); + + int code; + code = code_eanupc_encoding[ch - '0']; + + for (int i = 3; i >= 0; i--) { + int shift = (set == 1 ? 3 - i : i) * 4; + int bar = (set == 2 && i & 0x1) || (set != 2 && (i & 0x1) == 0); + float width = (code >> shift) & 0xf; + + switch (ch) { + case '1': + case '2': + if ((set == 0 && bar) || (set != 0 && !bar)) { + width -= 1.0 / 13.0; + } else { + width += 1.0 / 13.0; + } + break; + + case '7': + case '8': + if ((set == 0 && bar) || (set != 0 && !bar)) { + width += 1.0 / 13.0; + } else { + width -= 1.0 / 13.0; + } + break; + } + + width *= x_width; + if (bar) { + if (pdf_add_filled_rectangle(pdf, page, x, y, width, height, 0, + colour, PDF_TRANSPARENT) < 0) + return pdf->errval; + } + x += width; + } + if (new_x) + *new_x = x; + return 0; +} + +static int pdf_barcode_eanupc_aux(struct pdf_doc *pdf, + struct pdf_object *page, float x, float y, + float x_width, float height, + uint32_t colour, int guard_type, + float *new_x) +{ + int code = code_eanupc_aux_encoding[guard_type]; + + for (int i = 5; i >= 0; i--) { + int value = code >> i * 2 & 0x3; + if (value) { + if ((i & 0x1) == 0) { + if (pdf_add_filled_rectangle(pdf, page, x, y, x_width * value, + height, 0, colour, + PDF_TRANSPARENT) < 0) + return pdf->errval; + } + x += x_width * value; + } + } + if (new_x) + *new_x = x; + return 0; +} + +static int pdf_add_barcode_ean13(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float width, float height, + const char *string, uint32_t colour) +{ + if (!string) + return 0; + + size_t len = strlen(string); + int lead = 0; + if (len == 13) { + char ch = string[0]; + if (!isdigit(*string)) + return pdf_set_err(pdf, -EINVAL, + "Invalid EAN13 character %c 0x%x", ch, ch); + lead = ch - '0'; + ++string; + } else if (len != 12) + return pdf_set_err(pdf, -EINVAL, "Invalid EAN13 string length %lu", + len); + + /* Scale and calculate dimensions */ + float x_off, y_off, new_width, new_height, x_width, bar_height, bar_ext, + font; + + pdf_barcode_eanupc_calc_dims(PDF_BARCODE_EAN13, width, height, &x_off, + &y_off, &new_width, &new_height, &x_width, + &bar_height, &bar_ext, &font); + + x += x_off; + y += y_off; + float bar_y = y + new_height - bar_height; + + int e; + const char *save_font = pdf->current_font->font.name; + e = pdf_set_font(pdf, "Courier"); /* Built-in monospace font */ + if (e < 0) + return e; + + char text[2]; + text[1] = 0; + text[0] = lead + '0'; + e = pdf_add_text(pdf, page, text, font, x, y, colour); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + x += eanupc_dimensions[0].quiet_left * x_width; + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_NORMAL, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + for (int i = 0; i != 6; i++) { + text[0] = *string; + e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour, + 7 * x_width, PDF_ALIGN_CENTER, NULL); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + int set = (set_ean13_encoding[lead] & 1 << i) ? 1 : 0; + e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height, + colour, *string, set, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + string++; + } + + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_CENTRE, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + for (int i = 0; i != 6; i++) { + text[0] = *string; + e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour, + 7 * x_width, PDF_ALIGN_CENTER, NULL); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height, + colour, *string, 2, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + string++; + } + + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_NORMAL, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + text[0] = '>'; + x += eanupc_dimensions[0].quiet_right * x_width - + 604.0f * font / (14.0f * 72.0f); + e = pdf_add_text(pdf, page, text, font, x, y, colour); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + pdf_set_font(pdf, save_font); + return 0; +} + +static int pdf_add_barcode_upca(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float width, float height, + const char *string, uint32_t colour) +{ + if (!string) + return 0; + + size_t len = strlen(string); + if (len != 12) + return pdf_set_err(pdf, -EINVAL, "Invalid UPCA string length %lu", + len); + + /* Scale and calculate dimensions */ + float x_off, y_off, new_width, new_height; + float x_width, bar_height, bar_ext, font; + + pdf_barcode_eanupc_calc_dims(PDF_BARCODE_UPCA, width, height, &x_off, + &y_off, &new_width, &new_height, &x_width, + &bar_height, &bar_ext, &font); + + x += x_off; + y += y_off; + float bar_y = y + new_height - bar_height; + + int e; + const char *save_font = pdf->current_font->font.name; + e = pdf_set_font(pdf, "Courier"); + if (e < 0) + return e; + + char text[2]; + text[1] = 0; + text[0] = *string; + e = pdf_add_text(pdf, page, text, font * 4.0 / 7.0, x, y, colour); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + x += eanupc_dimensions[1].quiet_left * x_width; + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_NORMAL, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + for (int i = 0; i != 6; i++) { + text[0] = *string; + if (i) { + e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour, + 7 * x_width, PDF_ALIGN_CENTER, NULL); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + } + + e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y - (i ? 0 : bar_ext), + x_width, bar_height + (i ? 0 : bar_ext), + colour, *string, 0, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + string++; + } + + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_CENTRE, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + for (int i = 0; i != 6; i++) { + text[0] = *string; + if (i != 5) { + e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour, + 7 * x_width, PDF_ALIGN_CENTER, NULL); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + } + + e = pdf_barcode_eanupc_ch( + pdf, page, x, bar_y - (i != 5 ? 0 : bar_ext), x_width, + bar_height + (i != 5 ? 0 : bar_ext), colour, *string, 2, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + string++; + } + + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_NORMAL, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + text[0] = *--string; + + x += eanupc_dimensions[1].quiet_right * x_width - + 604.0f * font * 4.0f / 7.0f / (14.0f * 72.0f); + e = pdf_add_text(pdf, page, text, font * 4.0 / 7.0, x, y, colour); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + pdf_set_font(pdf, save_font); + return 0; +} + +static int pdf_add_barcode_ean8(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float width, float height, + const char *string, uint32_t colour) +{ + if (!string) + return 0; + + size_t len = strlen(string); + if (len != 8) + return pdf_set_err(pdf, -EINVAL, "Invalid EAN8 string length %lu", + len); + + /* Scale and calculate dimensions */ + float x_off, y_off, new_width, new_height, x_width, bar_height, bar_ext, + font; + + pdf_barcode_eanupc_calc_dims(PDF_BARCODE_EAN8, width, height, &x_off, + &y_off, &new_width, &new_height, &x_width, + &bar_height, &bar_ext, &font); + + x += x_off; + y += y_off; + float bar_y = y + new_height - bar_height; + + int e; + const char *save_font = pdf->current_font->font.name; + e = pdf_set_font(pdf, "Courier"); /* Built-in monospace font */ + if (e < 0) + return e; + + char text[2]; + text[1] = 0; + text[0] = '<'; + e = pdf_add_text(pdf, page, text, font, x, y, colour); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + x += eanupc_dimensions[2].quiet_left * x_width; + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_NORMAL, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + for (int i = 0; i != 4; i++) { + text[0] = *string; + e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour, + 7 * x_width, PDF_ALIGN_CENTER, NULL); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height, + colour, *string, 0, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + string++; + } + + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_CENTRE, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + for (int i = 0; i != 4; i++) { + text[0] = *string; + e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour, + 7 * x_width, PDF_ALIGN_CENTER, NULL); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height, + colour, *string, 2, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + string++; + } + + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y - bar_ext, x_width, + bar_height + bar_ext, colour, GUARD_NORMAL, + &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + text[0] = '>'; + x += eanupc_dimensions[0].quiet_right * x_width - + 604.0f * font / (14.0f * 72.0f); + e = pdf_add_text(pdf, page, text, font, x, y, colour); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + pdf_set_font(pdf, save_font); + return 0; +} + +static int pdf_add_barcode_upce(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float width, float height, + const char *string, uint32_t colour) +{ + if (!string) + return 0; + + size_t len = strlen(string); + if (len != 12) + return pdf_set_err(pdf, -EINVAL, "Invalid UPCE string length %lu", + len); + + if (*string != '0') + return pdf_set_err(pdf, -EINVAL, "Invalid UPCE char %c at start", + *string); + + for (size_t i = 0; i < len; i++) { + if (!isdigit(string[i])) + return pdf_set_err(pdf, -EINVAL, "Invalid UPCE char 0x%x at %zd", + string[i], i); + } + + /* Scale and calculate dimensions */ + float x_off, y_off, new_width, new_height; + float x_width, bar_height, bar_ext, font; + + pdf_barcode_eanupc_calc_dims(PDF_BARCODE_UPCE, width, height, &x_off, + &y_off, &new_width, &new_height, &x_width, + &bar_height, &bar_ext, &font); + + x += x_off; + y += y_off; + float bar_y = y + new_height - bar_height; + + int e; + const char *save_font = pdf->current_font->font.name; + e = pdf_set_font(pdf, "Courier"); + if (e < 0) + return e; + + char text[2]; + text[1] = 0; + text[0] = string[0]; + e = pdf_add_text(pdf, page, text, font * 4.0 / 7.0, x, y, colour); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + x += eanupc_dimensions[2].quiet_left * x_width; + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y, x_width, bar_height, + colour, GUARD_NORMAL, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + char X[6]; + if (string[5] && memcmp(string + 6, "0000", 4) == 0 && + '5' <= string[10] && string[10] <= '9') { + memcpy(X, string + 1, 5); + X[5] = string[10]; + } else if (string[4] && memcmp(string + 5, "00000", 5) == 0) { + memcpy(X, string + 1, 4); + X[4] = string[11]; + X[5] = 4; + } else if ('0' <= string[3] && string[3] <= '2' && + memcmp(string + 4, "0000", 4) == 0) { + X[0] = string[1]; + X[1] = string[2]; + X[2] = string[8]; + X[3] = string[9]; + X[4] = string[10]; + X[5] = string[3]; + } else if ('3' <= string[3] && string[3] <= '9' && + memcmp(string + 4, "00000", 5) == 0) { + memcpy(X, string + 1, 3); + X[3] = string[9]; + X[4] = string[10]; + X[5] = 3; + } else { + pdf_set_font(pdf, save_font); + return pdf_set_err(pdf, -EINVAL, "Invalid UPCE string format"); + } + + for (int i = 0; i != 6; i++) { + text[0] = X[i]; + e = pdf_add_text_wrap(pdf, page, text, font, x, y, colour, + 7 * x_width, PDF_ALIGN_CENTER, NULL); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + int set = (set_upce_encoding[string[11] - '0'] & 1 << i) ? 1 : 0; + e = pdf_barcode_eanupc_ch(pdf, page, x, bar_y, x_width, bar_height, + colour, X[i], set, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + } + + e = pdf_barcode_eanupc_aux(pdf, page, x, bar_y, x_width, bar_height, + colour, GUARD_SPECIAL, &x); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + text[0] = string[11]; + x += eanupc_dimensions[0].quiet_right * x_width - + 604.0f * font * 4.0f / 7.0f / (14.0f * 72.0f); + e = pdf_add_text(pdf, page, text, font * 4.0 / 7.0, x, y, colour); + if (e < 0) { + pdf_set_font(pdf, save_font); + return e; + } + + pdf_set_font(pdf, save_font); + return 0; +} + +int pdf_add_barcode(struct pdf_doc *pdf, struct pdf_object *page, int code, + float x, float y, float width, float height, + const char *string, uint32_t colour) +{ + if (!string || !*string) + return 0; + switch (code) { + case PDF_BARCODE_128A: + return pdf_add_barcode_128a(pdf, page, x, y, width, height, string, + colour); + case PDF_BARCODE_39: + return pdf_add_barcode_39(pdf, page, x, y, width, height, string, + colour); + case PDF_BARCODE_EAN13: + return pdf_add_barcode_ean13(pdf, page, x, y, width, height, string, + colour); + case PDF_BARCODE_UPCA: + return pdf_add_barcode_upca(pdf, page, x, y, width, height, string, + colour); + case PDF_BARCODE_EAN8: + return pdf_add_barcode_ean8(pdf, page, x, y, width, height, string, + colour); + case PDF_BARCODE_UPCE: + return pdf_add_barcode_upce(pdf, page, x, y, width, height, string, + colour); + default: + return pdf_set_err(pdf, -EINVAL, "Invalid barcode code %d", code); + } +} + +static pdf_object *pdf_add_raw_grayscale8(struct pdf_doc *pdf, + const uint8_t *data, uint32_t width, + uint32_t height) +{ + struct pdf_object *obj; + size_t len; + const char *endstream = ">\r\nendstream\r\n"; + struct dstr str = INIT_DSTR; + size_t data_len = (size_t)width * (size_t)height; + + dstr_printf(&str, + "<<\r\n" + " /Type /XObject\r\n" + " /Name /Image%d\r\n" + " /Subtype /Image\r\n" + " /ColorSpace /DeviceGray\r\n" + " /Height %d\r\n" + " /Width %d\r\n" + " /BitsPerComponent 8\r\n" + " /Length %zu\r\n" + ">>stream\r\n", + flexarray_size(&pdf->objects), height, width, data_len + 1); + + len = dstr_len(&str) + data_len + strlen(endstream) + 1; + if (dstr_ensure(&str, len) < 0) { + dstr_free(&str); + pdf_set_err(pdf, -ENOMEM, + "Unable to allocate %zu bytes memory for image", len); + return NULL; + } + dstr_append_data(&str, data, data_len); + dstr_append(&str, endstream); + + obj = pdf_add_object(pdf, OBJ_image); + if (!obj) { + dstr_free(&str); + return NULL; + } + obj->stream = str; + + return obj; +} + +static struct pdf_object *pdf_add_raw_rgb24(struct pdf_doc *pdf, + const uint8_t *data, + uint32_t width, uint32_t height) +{ + struct pdf_object *obj; + size_t len; + const char *endstream = ">\r\nendstream\r\n"; + struct dstr str = INIT_DSTR; + size_t data_len = (size_t)width * (size_t)height * 3; + + dstr_printf(&str, + "<<\r\n" + " /Type /XObject\r\n" + " /Name /Image%d\r\n" + " /Subtype /Image\r\n" + " /ColorSpace /DeviceRGB\r\n" + " /Height %d\r\n" + " /Width %d\r\n" + " /BitsPerComponent 8\r\n" + " /Length %zu\r\n" + ">>stream\r\n", + flexarray_size(&pdf->objects), height, width, data_len + 1); + + len = dstr_len(&str) + data_len + strlen(endstream) + 1; + if (dstr_ensure(&str, len) < 0) { + dstr_free(&str); + pdf_set_err(pdf, -ENOMEM, + "Unable to allocate %zu bytes memory for image", len); + return NULL; + } + dstr_append_data(&str, data, data_len); + dstr_append(&str, endstream); + + obj = pdf_add_object(pdf, OBJ_image); + if (!obj) { + dstr_free(&str); + return NULL; + } + obj->stream = str; + + return obj; +} + +static uint8_t *get_file(struct pdf_doc *pdf, const char *file_name, + size_t *length) +{ + FILE *fp; + uint8_t *file_data; + struct stat buf; + off_t len; + + if ((fp = fopen(file_name, "rb")) == NULL) { + pdf_set_err(pdf, -errno, "Unable to open %s: %s", file_name, + strerror(errno)); + return NULL; + } + + if (fstat(fileno(fp), &buf) < 0) { + pdf_set_err(pdf, -errno, "Unable to access %s: %s", file_name, + strerror(errno)); + fclose(fp); + return NULL; + } + + len = buf.st_size; + + file_data = (uint8_t *)malloc(len); + if (!file_data) { + pdf_set_err(pdf, -ENOMEM, "Unable to allocate: %d", (int)len); + fclose(fp); + return NULL; + } + + if (fread(file_data, len, 1, fp) != 1) { + pdf_set_err(pdf, -errno, "Unable to read full data: %s", file_name); + free(file_data); + fclose(fp); + return NULL; + } + + fclose(fp); + + *length = len; + + return file_data; +} + +static struct pdf_object * +pdf_add_raw_jpeg_data(struct pdf_doc *pdf, const struct pdf_img_info *info, + const uint8_t *jpeg_data, size_t len) +{ + struct pdf_object *obj = pdf_add_object(pdf, OBJ_image); + if (!obj) + return NULL; + + dstr_printf(&obj->stream, + "<<\r\n" + " /Type /XObject\r\n" + " /Name /Image%d\r\n" + " /Subtype /Image\r\n" + " /ColorSpace %s\r\n" + " /Width %d\r\n" + " /Height %d\r\n" + " /BitsPerComponent 8\r\n" + " /Filter /DCTDecode\r\n" + " /Length %zu\r\n" + ">>stream\r\n", + flexarray_size(&pdf->objects), + (info->jpeg.ncolours == 1) ? "/DeviceGray" : "/DeviceRGB", + info->width, info->height, len); + dstr_append_data(&obj->stream, jpeg_data, len); + + dstr_printf(&obj->stream, "\r\nendstream\r\n"); + + return obj; +} + +/** + * Get the display dimensions of an image, respecting the images aspect ratio + * if only one desired display dimension is defined. + * The pdf parameter is only used for setting the error value. + */ +static int get_img_display_dimensions(struct pdf_doc *pdf, uint32_t img_width, + uint32_t img_height, + float *display_width, + float *display_height) +{ + if (!display_height || !display_width) { + return pdf_set_err( + pdf, -EINVAL, + "display_width and display_height may not be null pointers"); + } + + const float display_width_in = *display_width; + const float display_height_in = *display_height; + + if (display_width_in < 0 && display_height_in < 0) { + return pdf_set_err(pdf, -EINVAL, + "Unable to determine image display dimensions, " + "display_width and display_height are both < 0"); + } + if (img_width == 0 || img_height == 0) { + return pdf_set_err(pdf, -EINVAL, + "Invalid image dimensions received, the loaded " + "image appears to be empty."); + } + + if (display_width_in < 0) { + // Set width, keeping aspect ratio + *display_width = display_height_in * ((float)img_width / img_height); + } else if (display_height_in < 0) { + // Set height, keeping aspect ratio + *display_height = display_width_in * ((float)img_height / img_width); + } + return 0; +} + +static int pdf_add_image(struct pdf_doc *pdf, struct pdf_object *page, + struct pdf_object *image, float x, float y, + float width, float height) +{ + int ret; + struct dstr str = INIT_DSTR; + + dstr_append(&str, "q "); + dstr_printf(&str, "%f 0 0 %f %f %f cm ", width, height, x, y); + dstr_printf(&str, "/Image%d Do ", image->index); + dstr_append(&str, "Q"); + + ret = pdf_add_stream(pdf, page, dstr_data(&str)); + dstr_free(&str); + return ret; +} + +// Works like fgets, except it's for a fixed in-memory buffer of data +static size_t dgets(const uint8_t *data, size_t *pos, size_t len, char *line, + size_t line_len) +{ + size_t line_pos = 0; + + if (*pos >= len) + return 0; + + while ((*pos) < len) { + if (line_pos < line_len) { + // Reject non-ascii data + if (data[*pos] & 0x80) { + return 0; + } + line[line_pos] = data[*pos]; + line_pos++; + } + if (data[*pos] == '\n') { + (*pos)++; + break; + } + (*pos)++; + } + + if (line_pos < line_len) { + line[line_pos] = '\0'; + } + + return *pos; +} + +static int parse_ppm_header(struct pdf_img_info *info, const uint8_t *data, + size_t length, char *err_msg, + size_t err_msg_length) +{ + char line[1024]; + memset(line, '\0', sizeof(line)); + size_t pos = 0; + + // Load the PPM file + if (!dgets(data, &pos, length, line, sizeof(line) - 1)) { + snprintf(err_msg, err_msg_length, "Invalid PPM file"); + return -EINVAL; + } + + // Determine number of color channels (Also, we only support binary ppms) + int ncolors; + if (strncmp(line, "P6", 2) == 0) { + info->ppm.color_space = PPM_BINARY_COLOR_RGB; + ncolors = 3; + } else if (strncmp(line, "P5", 2) == 0) { + info->ppm.color_space = PPM_BINARY_COLOR_GRAY; + ncolors = 1; + } else { + snprintf(err_msg, err_msg_length, + "Only binary PPM files (grayscale, RGB) supported"); + return -EINVAL; + } + + // Skip comments before header + do { + if (!dgets(data, &pos, length, line, sizeof(line) - 1)) { + snprintf(err_msg, err_msg_length, "Unable to find PPM header"); + return -EINVAL; + } + } while (line[0] == '#'); + + // Read image dimensions + if (sscanf(line, "%u %u\n", &(info->width), &(info->height)) != 2) { + snprintf(err_msg, err_msg_length, "Unable to find PPM size"); + return -EINVAL; + } + if (info->width > MAX_IMAGE_WIDTH || info->height > MAX_IMAGE_HEIGHT) { + snprintf(err_msg, err_msg_length, "Invalid width/height: %ux%u", + info->width, info->height); + return -EINVAL; + } + info->ppm.size = (size_t)(info->width * info->height * ncolors); + info->ppm.data_begin_pos = pos; + + return 0; +} + +static int pdf_add_ppm_data(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float display_width, + float display_height, + const struct pdf_img_info *info, + const uint8_t *ppm_data, size_t len) +{ + char line[1024]; + // We start reading at the position delivered by parse_ppm_header, + // since we already parsed the header of the file there. + size_t pos = info->ppm.data_begin_pos; + + /* Skip over the byte-size line */ + if (!dgets(ppm_data, &pos, len, line, sizeof(line) - 1)) + return pdf_set_err(pdf, -EINVAL, "No byte-size line in PPM file"); + + /* Try and limit the memory usage to sane images */ + if (info->width > MAX_IMAGE_WIDTH || info->height > MAX_IMAGE_HEIGHT) { + return pdf_set_err(pdf, -EINVAL, + "Invalid width/height in PPM file: %ux%u", + info->width, info->height); + } + + if (info->ppm.size > len - pos) { + return pdf_set_err(pdf, -EINVAL, "Insufficient image data available"); + } + + switch (info->ppm.color_space) { + case PPM_BINARY_COLOR_GRAY: + return pdf_add_grayscale8(pdf, page, x, y, display_width, + display_height, &ppm_data[pos], info->width, + info->height); + break; + + case PPM_BINARY_COLOR_RGB: + return pdf_add_rgb24(pdf, page, x, y, display_width, display_height, + &ppm_data[pos], info->width, info->height); + break; + + default: + return pdf_set_err(pdf, -EINVAL, + "Invalid color space in ppm file: %i", + info->ppm.color_space); + break; + } +} + +static int parse_jpeg_header(struct pdf_img_info *info, const uint8_t *data, + size_t length, char *err_msg, + size_t err_msg_length) +{ + // See http://www.videotechnology.com/jpeg/j1.html for details + if (length >= 4 && data[0] == 0xFF && data[1] == 0xD8) { + for (size_t i = 2; i < length; i++) { + if (data[i] != 0xff) { + break; + } + while (++i < length && data[i] == 0xff) + ; + if (i + 2 >= length) { + break; + } + int len = data[i + 1] * 256 + data[i + 2]; + /* Search for SOFn marker and decode jpeg details */ + if ((data[i] & 0xf4) == 0xc0) { + if (len >= 9 && i + len + 1 < length) { + info->height = data[i + 4] * 256 + data[i + 5]; + info->width = data[i + 6] * 256 + data[i + 7]; + info->jpeg.ncolours = data[i + 8]; + return 0; + } + break; + } + i += len; + } + } + snprintf(err_msg, err_msg_length, "Error parsing JPEG header"); + return -EINVAL; +} + +static int pdf_add_jpeg_data(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float display_width, + float display_height, struct pdf_img_info *info, + const uint8_t *jpeg_data, size_t len) +{ + struct pdf_object *obj; + + obj = pdf_add_raw_jpeg_data(pdf, info, jpeg_data, len); + if (!obj) + return pdf->errval; + + if (get_img_display_dimensions(pdf, info->width, info->height, + &display_width, &display_height)) { + return pdf->errval; + } + return pdf_add_image(pdf, page, obj, x, y, display_width, display_height); +} + +int pdf_add_rgb24(struct pdf_doc *pdf, struct pdf_object *page, float x, + float y, float display_width, float display_height, + const uint8_t *data, uint32_t width, uint32_t height) +{ + struct pdf_object *obj; + + obj = pdf_add_raw_rgb24(pdf, data, width, height); + if (!obj) + return pdf->errval; + + if (get_img_display_dimensions(pdf, width, height, &display_width, + &display_height)) { + return pdf->errval; + } + return pdf_add_image(pdf, page, obj, x, y, display_width, display_height); +} + +int pdf_add_grayscale8(struct pdf_doc *pdf, struct pdf_object *page, float x, + float y, float display_width, float display_height, + const uint8_t *data, uint32_t width, uint32_t height) +{ + struct pdf_object *obj; + + obj = pdf_add_raw_grayscale8(pdf, data, width, height); + if (!obj) + return pdf->errval; + + if (get_img_display_dimensions(pdf, width, height, &display_width, + &display_height)) { + return pdf->errval; + } + return pdf_add_image(pdf, page, obj, x, y, display_width, display_height); +} + +static int parse_png_header(struct pdf_img_info *info, const uint8_t *data, + size_t length, char *err_msg, + size_t err_msg_length) +{ + if (length <= sizeof(png_signature)) { + snprintf(err_msg, err_msg_length, "PNG file too short"); + return -EINVAL; + } + + if (memcmp(data, png_signature, sizeof(png_signature))) { + snprintf(err_msg, err_msg_length, "File is not correct PNG file"); + return -EINVAL; + } + + // process first PNG chunk + uint32_t pos = sizeof(png_signature); + const struct png_chunk *chunk = (const struct png_chunk *)&data[pos]; + pos += sizeof(struct png_chunk); + if (pos > length) { + snprintf(err_msg, err_msg_length, "PNG file too short"); + return -EINVAL; + } + if (strncmp(chunk->type, png_chunk_header, 4) == 0) { + // header found, process width and height, check errors + struct png_header *header = &info->png; + + if (pos + sizeof(struct png_header) > length) { + snprintf(err_msg, err_msg_length, "PNG file too short"); + return -EINVAL; + } + + memcpy(header, &data[pos], sizeof(struct png_header)); + if (header->deflate != 0) { + snprintf(err_msg, err_msg_length, "Deflate wrong in PNG header"); + return -EINVAL; + } + if (header->bitDepth == 0) { + snprintf(err_msg, err_msg_length, "PNG file has zero bit depth"); + return -EINVAL; + } + // ensure the width and height values have the proper byte order + // and copy them into the info struct. + header->width = ntoh32(header->width); + header->height = ntoh32(header->height); + info->width = header->width; + info->height = header->height; + return 0; + } + snprintf(err_msg, err_msg_length, "Failed to read PNG file header"); + return -EINVAL; +} + +static int pdf_add_png_data(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float display_width, + float display_height, + const struct pdf_img_info *img_info, + const uint8_t *png_data, size_t png_data_length) +{ + // indicates if we return an error or add the img at the + // end of the function + bool success = false; + + // string stream used for writing color space (and palette) info + // into the pdf + struct dstr colour_space = INIT_DSTR; + + struct pdf_object *obj = NULL; + uint8_t *final_data = NULL; + int written = 0; + uint32_t pos; + uint8_t *png_data_temp = NULL; + size_t png_data_total_length = 0; + uint8_t ncolours; + + // Stores palette information for indexed PNGs + struct rgb_value *palette_buffer = NULL; + size_t palette_buffer_length = 0; + + const struct png_header *header = &img_info->png; + + // Father info from png header + switch (header->colorType) { + case PNG_COLOR_GREYSCALE: + ncolours = 1; + break; + case PNG_COLOR_RGB: + ncolours = 3; + break; + case PNG_COLOR_INDEXED: + ncolours = 1; + break; + // PNG_COLOR_RGBA and PNG_COLOR_GREYSCALE_A are unsupported + default: + pdf_set_err(pdf, -EINVAL, "PNG has unsupported color type: %d", + header->colorType); + goto free_buffers; + break; + } + + /* process PNG chunks */ + pos = sizeof(png_signature); + + while (1) { + const struct png_chunk *chunk; + + chunk = (const struct png_chunk *)&png_data[pos]; + pos += sizeof(struct png_chunk); + + if (pos > png_data_length - 4) { + pdf_set_err(pdf, -EINVAL, "PNG file too short"); + goto free_buffers; + } + const uint32_t chunk_length = ntoh32(chunk->length); + // chunk length + 4-bytes of CRC + if (chunk_length > png_data_length - pos - 4) { + pdf_set_err(pdf, -EINVAL, "PNG chunk exceeds file: %d vs %ld", + chunk_length, png_data_length - pos - 4); + goto free_buffers; + } + if (strncmp(chunk->type, png_chunk_header, 4) == 0) { + // Ignoring the header, since it was parsed + // before calling this function. + } else if (strncmp(chunk->type, png_chunk_palette, 4) == 0) { + // Palette chunk + if (header->colorType == PNG_COLOR_INDEXED) { + // palette chunk is needed for indexed images + if (palette_buffer) { + pdf_set_err(pdf, -EINVAL, + "PNG contains multiple palette chunks"); + goto free_buffers; + } + if (chunk_length % 3 != 0) { + pdf_set_err(pdf, -EINVAL, + "PNG format error: palette chunk length is " + "not divisbly by 3!"); + goto free_buffers; + } + palette_buffer_length = (size_t)(chunk_length / 3); + if (palette_buffer_length > 256 || + palette_buffer_length == 0) { + pdf_set_err(pdf, -EINVAL, + "PNG palette length invalid: %zd", + palette_buffer_length); + goto free_buffers; + } + palette_buffer = (struct rgb_value *)malloc( + palette_buffer_length * sizeof(struct rgb_value)); + if (!palette_buffer) { + pdf_set_err(pdf, -ENOMEM, + "Could not allocate memory for indexed color " + "palette (%zu bytes)", + palette_buffer_length * + sizeof(struct rgb_value)); + goto free_buffers; + } + for (size_t i = 0; i < palette_buffer_length; i++) { + size_t offset = (i * 3) + pos; + palette_buffer[i].red = png_data[offset]; + palette_buffer[i].green = png_data[offset + 1]; + palette_buffer[i].blue = png_data[offset + 2]; + } + } else if (header->colorType == PNG_COLOR_RGB || + header->colorType == PNG_COLOR_RGBA) { + // palette chunk is optional for RGB(A) images + // but we do not process them + } else { + pdf_set_err(pdf, -EINVAL, + "Unexpected palette chunk for color type %d", + header->colorType); + goto free_buffers; + } + } else if (strncmp(chunk->type, png_chunk_data, 4) == 0) { + if (chunk_length > 0 && chunk_length < png_data_length - pos) { + uint8_t *data = (uint8_t *)realloc( + png_data_temp, png_data_total_length + chunk_length); + // (uint8_t *)realloc(info.data, info.length + chunk_length); + if (!data) { + pdf_set_err(pdf, -ENOMEM, "No memory for PNG data"); + goto free_buffers; + } + png_data_temp = data; + memcpy(&png_data_temp[png_data_total_length], &png_data[pos], + chunk_length); + png_data_total_length += chunk_length; + } + } else if (strncmp(chunk->type, png_chunk_end, 4) == 0) { + /* end of file, exit */ + break; + } + + if (chunk_length >= png_data_length) { + pdf_set_err(pdf, -EINVAL, "PNG chunk length larger than file"); + goto free_buffers; + } + + pos += chunk_length; // add chunk length + pos += sizeof(uint32_t); // add CRC length + } + + /* if no length was found */ + if (png_data_total_length == 0) { + pdf_set_err(pdf, -EINVAL, "PNG file has zero length"); + goto free_buffers; + } + + switch (header->colorType) { + case PNG_COLOR_GREYSCALE: + dstr_append(&colour_space, "/DeviceGray"); + break; + case PNG_COLOR_RGB: + dstr_append(&colour_space, "/DeviceRGB"); + break; + case PNG_COLOR_INDEXED: + if (palette_buffer_length == 0) { + pdf_set_err(pdf, -EINVAL, "Indexed PNG contains no palette"); + goto free_buffers; + } + // Write the color palette to the color_palette buffer + dstr_printf(&colour_space, + "[ /Indexed\r\n" + " /DeviceRGB\r\n" + " %zu\r\n" + " <", + palette_buffer_length - 1); + // write individual paletter values + // the index value for every RGB value is determined by its position + // (0, 1, 2, ...) + for (size_t i = 0; i < palette_buffer_length; i++) { + dstr_printf(&colour_space, "%02X%02X%02X ", palette_buffer[i].red, + palette_buffer[i].green, palette_buffer[i].blue); + } + dstr_append(&colour_space, ">\r\n]"); + break; + + default: + pdf_set_err(pdf, -EINVAL, + "Cannot map PNG color type %d to PDF color space", + header->colorType); + goto free_buffers; + break; + } + + final_data = (uint8_t *)malloc(png_data_total_length + 1024 + + dstr_len(&colour_space)); + if (!final_data) { + pdf_set_err(pdf, -ENOMEM, "Unable to allocate PNG data %zu", + png_data_total_length + 1024 + dstr_len(&colour_space)); + goto free_buffers; + } + + // Write image information to PDF + written = + sprintf((char *)final_data, + "<<\r\n" + " /Type /XObject\r\n" + " /Name /Image%d\r\n" + " /Subtype /Image\r\n" + " /ColorSpace %s\r\n" + " /Width %u\r\n" + " /Height %u\r\n" + " /Interpolate true\r\n" + " /BitsPerComponent %u\r\n" + " /Filter /FlateDecode\r\n" + " /DecodeParms << /Predictor 15 /Colors %d " + "/BitsPerComponent %u /Columns %u >>\r\n" + " /Length %zu\r\n" + ">>stream\r\n", + flexarray_size(&pdf->objects), dstr_data(&colour_space), + header->width, header->height, header->bitDepth, ncolours, + header->bitDepth, header->width, png_data_total_length); + + memcpy(&final_data[written], png_data_temp, png_data_total_length); + written += png_data_total_length; + written += sprintf((char *)&final_data[written], "\r\nendstream\r\n"); + + obj = pdf_add_object(pdf, OBJ_image); + if (!obj) { + goto free_buffers; + } + + dstr_append_data(&obj->stream, final_data, written); + + if (get_img_display_dimensions(pdf, header->width, header->height, + &display_width, &display_height)) { + goto free_buffers; + } + success = true; + +free_buffers: + if (final_data) + free(final_data); + if (palette_buffer) + free(palette_buffer); + if (png_data_temp) + free(png_data_temp); + dstr_free(&colour_space); + + if (success) + return pdf_add_image(pdf, page, obj, x, y, display_width, + display_height); + else + return pdf->errval; +} + +static int parse_bmp_header(struct pdf_img_info *info, const uint8_t *data, + size_t data_length, char *err_msg, + size_t err_msg_length) +{ + if (data_length < sizeof(bmp_signature) + sizeof(struct bmp_header)) { + snprintf(err_msg, err_msg_length, "File is too short"); + return -EINVAL; + } + + if (memcmp(data, bmp_signature, sizeof(bmp_signature))) { + snprintf(err_msg, err_msg_length, "File is not correct BMP file"); + return -EINVAL; + } + memcpy(&info->bmp, &data[sizeof(bmp_signature)], + sizeof(struct bmp_header)); + if (info->bmp.biWidth < 0) { + snprintf(err_msg, err_msg_length, "BMP has negative width"); + return -EINVAL; + } + if (info->bmp.biHeight == -2147483648) { // 1 << 31 + snprintf(err_msg, err_msg_length, "BMP height overflow"); + return -EINVAL; + } + info->width = info->bmp.biWidth; + // biHeight might be negative (positive indicates vertically mirrored + // lines) + info->height = abs(info->bmp.biHeight); + return 0; +} + +static int pdf_add_bmp_data(struct pdf_doc *pdf, struct pdf_object *page, + float x, float y, float display_width, + float display_height, + const struct pdf_img_info *info, + const uint8_t *data, const size_t len) +{ + const struct bmp_header *header = &info->bmp; + uint8_t *bmp_data = NULL; + uint8_t row_padding; + uint32_t bpp; + size_t data_len; + int retval; + const uint32_t width = info->width; + const uint32_t height = info->height; + + if (header->bfSize != len) + return pdf_set_err(pdf, -EINVAL, + "BMP file seems to have wrong length"); + if (header->biSize != 40) + return pdf_set_err(pdf, -EINVAL, "Wrong BMP header: biSize"); + if (header->biCompression != 0) + return pdf_set_err(pdf, -EINVAL, "Wrong BMP compression value: %d", + header->biCompression); + if (header->biWidth > MAX_IMAGE_WIDTH || header->biWidth <= 0 || + width > MAX_IMAGE_WIDTH || width == 0) + return pdf_set_err(pdf, -EINVAL, "BMP has invalid width: %d", + header->biWidth); + if (header->biHeight > MAX_IMAGE_HEIGHT || + header->biHeight < -MAX_IMAGE_HEIGHT || header->biHeight == 0 || + height > MAX_IMAGE_HEIGHT || height == 0) + return pdf_set_err(pdf, -EINVAL, "BMP has invalid height: %d", + header->biHeight); + if (header->biBitCount != 24 && header->biBitCount != 32) + return pdf_set_err(pdf, -EINVAL, "Unsupported BMP bitdepth: %d", + header->biBitCount); + bpp = header->biBitCount / 8; + /* BMP rows are 4-bytes padded! */ + row_padding = (width * bpp) & 3; + data_len = (size_t)width * (size_t)height * 3; + + if (header->bfOffBits >= len) + return pdf_set_err(pdf, -EINVAL, "Invalid BMP image offset"); + + if (len - header->bfOffBits < + (size_t)height * (width + row_padding) * bpp) + return pdf_set_err(pdf, -EINVAL, "Wrong BMP image size"); + + if (bpp == 3) { + /* 24 bits: change R and B colors */ + bmp_data = (uint8_t *)malloc(data_len); + if (!bmp_data) + return pdf_set_err(pdf, -ENOMEM, + "Insufficient memory for bitmap"); + for (uint32_t pos = 0; pos < width * height; pos++) { + uint32_t src_pos = + header->bfOffBits + 3 * (pos + (pos / width) * row_padding); + + bmp_data[pos * 3] = data[src_pos + 2]; + bmp_data[pos * 3 + 1] = data[src_pos + 1]; + bmp_data[pos * 3 + 2] = data[src_pos]; + } + } else if (bpp == 4) { + /* 32 bits: change R and B colors, remove key color */ + int offs = 0; + bmp_data = (uint8_t *)malloc(data_len); + if (!bmp_data) + return pdf_set_err(pdf, -ENOMEM, + "Insufficient memory for bitmap"); + + for (uint32_t pos = 0; pos < width * height * 4; pos += 4) { + bmp_data[offs] = data[header->bfOffBits + pos + 2]; + bmp_data[offs + 1] = data[header->bfOffBits + pos + 1]; + bmp_data[offs + 2] = data[header->bfOffBits + pos]; + offs += 3; + } + } else { + return pdf_set_err(pdf, -EINVAL, "Unsupported BMP bitdepth: %d", + header->biBitCount); + } + if (header->biHeight >= 0) { + // BMP has vertically mirrored representation of lines, so swap them + uint8_t *line = (uint8_t *)malloc(width * 3); + if (!line) { + free(bmp_data); + return pdf_set_err(pdf, -ENOMEM, + "Unable to allocate memory for bitmap mirror"); + } + for (uint32_t pos = 0; pos < (height / 2); pos++) { + memcpy(line, &bmp_data[pos * width * 3], width * 3); + memcpy(&bmp_data[pos * width * 3], + &bmp_data[(height - pos - 1) * width * 3], width * 3); + memcpy(&bmp_data[(height - pos - 1) * width * 3], line, + width * 3); + } + free(line); + } + + retval = pdf_add_rgb24(pdf, page, x, y, display_width, display_height, + bmp_data, width, height); + free(bmp_data); + + return retval; +} + +static int determine_image_format(const uint8_t *data, size_t length) +{ + if (length >= sizeof(png_signature) && + memcmp(data, png_signature, sizeof(png_signature)) == 0) + return IMAGE_PNG; + if (length >= sizeof(bmp_signature) && + memcmp(data, bmp_signature, sizeof(bmp_signature)) == 0) + return IMAGE_BMP; + if (length >= sizeof(jpeg_signature) && + memcmp(data, jpeg_signature, sizeof(jpeg_signature)) == 0) + return IMAGE_JPG; + if (length >= sizeof(ppm_signature) && + memcmp(data, ppm_signature, sizeof(ppm_signature)) == 0) + return IMAGE_PPM; + if (length >= sizeof(pgm_signature) && + memcmp(data, pgm_signature, sizeof(pgm_signature)) == 0) + return IMAGE_PPM; + + return IMAGE_UNKNOWN; +} + +int pdf_parse_image_header(struct pdf_img_info *info, const uint8_t *data, + size_t length, char *err_msg, + size_t err_msg_length) + +{ + const int image_format = determine_image_format(data, length); + info->image_format = image_format; + switch (image_format) { + case IMAGE_PNG: + return parse_png_header(info, data, length, err_msg, err_msg_length); + case IMAGE_BMP: + return parse_bmp_header(info, data, length, err_msg, err_msg_length); + case IMAGE_JPG: + return parse_jpeg_header(info, data, length, err_msg, err_msg_length); + case IMAGE_PPM: + return parse_ppm_header(info, data, length, err_msg, err_msg_length); + + case IMAGE_UNKNOWN: + default: + snprintf(err_msg, err_msg_length, "Unknown file format"); + return -EINVAL; + } +} + +int pdf_add_image_data(struct pdf_doc *pdf, struct pdf_object *page, float x, + float y, float display_width, float display_height, + const uint8_t *data, size_t len) +{ + struct pdf_img_info info = { + .image_format = IMAGE_UNKNOWN, + .width = 0, + .height = 0, + .jpeg = {0}, + }; + + int ret = pdf_parse_image_header(&info, data, len, pdf->errstr, + sizeof(pdf->errstr)); + if (ret) + return ret; + + // Try and determine which image format it is based on the content + switch (info.image_format) { + case IMAGE_PNG: + return pdf_add_png_data(pdf, page, x, y, display_width, + display_height, &info, data, len); + case IMAGE_BMP: + return pdf_add_bmp_data(pdf, page, x, y, display_width, + display_height, &info, data, len); + case IMAGE_JPG: + return pdf_add_jpeg_data(pdf, page, x, y, display_width, + display_height, &info, data, len); + case IMAGE_PPM: + return pdf_add_ppm_data(pdf, page, x, y, display_width, + display_height, &info, data, len); + + // This case should be caught in parse_image_header, but is checked + // here again for safety + case IMAGE_UNKNOWN: + default: + return pdf_set_err(pdf, -EINVAL, "Unable to determine image format"); + } +} + +int pdf_add_image_file(struct pdf_doc *pdf, struct pdf_object *page, float x, + float y, float display_width, float display_height, + const char *image_filename) +{ + size_t len; + uint8_t *data; + int ret = 0; + + data = get_file(pdf, image_filename, &len); + if (data == NULL) + return pdf_get_errval(pdf); + + ret = pdf_add_image_data(pdf, page, x, y, display_width, display_height, + data, len); + free(data); + return ret; +} |