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/*
* blob.c
*
* Copyright (c) 2002 Dug Song <dugsong@monkey.org>
*
* $Id: blob.c 615 2006-01-08 16:06:49Z dugsong $
*/
#ifdef _WIN32
#include "dnet_winconfig.h"
#else
#include "config.h"
#endif
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dnet.h"
static void *(*bl_malloc)(size_t) = malloc;
static void *(*bl_realloc)(void *, size_t) = realloc;
static void (*bl_free)(void *) = free;
static int bl_size = BUFSIZ;
static int fmt_D(int, int, blob_t *, va_list *);
static int fmt_H(int, int, blob_t *, va_list *);
static int fmt_b(int, int, blob_t *, va_list *);
static int fmt_c(int, int, blob_t *, va_list *);
static int fmt_d(int, int, blob_t *, va_list *);
static int fmt_h(int, int, blob_t *, va_list *);
static int fmt_s(int, int, blob_t *, va_list *);
static void print_hexl(blob_t *);
static blob_fmt_cb blob_ascii_fmt[] = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, fmt_D, NULL, NULL, NULL,
fmt_H, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, fmt_b, fmt_c, fmt_d, NULL, NULL, NULL,
fmt_h, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, fmt_s, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
struct blob_printer {
char *name;
void (*print)(blob_t *);
} blob_printers[] = {
{ "hexl", print_hexl },
{ NULL, NULL },
};
blob_t *
blob_new(void)
{
blob_t *b;
if ((b = bl_malloc(sizeof(*b))) != NULL) {
b->off = b->end = 0;
b->size = bl_size;
if ((b->base = bl_malloc(b->size)) == NULL) {
bl_free(b);
b = NULL;
}
}
return (b);
}
static int
blob_reserve(blob_t *b, int len)
{
void *p;
int nsize;
if (b->size < b->end + len) {
if (b->size == 0)
return (-1);
if ((nsize = b->end + len) > bl_size)
nsize = ((nsize / bl_size) + 1) * bl_size;
if ((p = bl_realloc(b->base, nsize)) == NULL)
return (-1);
b->base = p;
b->size = nsize;
}
b->end += len;
return (0);
}
int
blob_read(blob_t *b, void *buf, int len)
{
if (b->end - b->off < len)
len = b->end - b->off;
memcpy(buf, b->base + b->off, len);
b->off += len;
return (len);
}
int
blob_write(blob_t *b, const void *buf, int len)
{
if (b->off + len <= b->end ||
blob_reserve(b, b->off + len - b->end) == 0) {
memcpy(b->base + b->off, (u_char *)buf, len);
b->off += len;
return (len);
}
return (-1);
}
int
blob_insert(blob_t *b, const void *buf, int len)
{
if (blob_reserve(b, len) == 0 && b->size) {
if (b->end - b->off > 0)
memmove( b->base + b->off + len, b->base + b->off, b->end - b->off);
memcpy(b->base + b->off, buf, len);
b->off += len;
return (len);
}
return (-1);
}
int
blob_delete(blob_t *b, void *buf, int len)
{
if (b->off + len <= b->end && b->size) {
if (buf != NULL)
memcpy(buf, b->base + b->off, len);
memmove(b->base + b->off, b->base + b->off + len, b->end - (b->off + len));
b->end -= len;
return (len);
}
return (-1);
}
static int
blob_fmt(blob_t *b, int pack, const char *fmt, va_list *ap)
{
blob_fmt_cb fmt_cb;
char *p;
int len;
for (p = (char *)fmt; *p != '\0'; p++) {
if (*p == '%') {
p++;
if (isdigit((int) (unsigned char) *p)) {
len = strtol(p, &p, 10);
} else if (*p == '*') {
len = va_arg(*ap, int);
p++;
} else
len = 0;
if ((fmt_cb = blob_ascii_fmt[(int)*p]) == NULL)
return (-1);
if ((*fmt_cb)(pack, len, b, ap) < 0)
return (-1);
} else {
if (pack) {
if (b->off + 1 < b->end ||
blob_reserve(b, b->off + 1 - b->end) == 0)
b->base[b->off++] = *p;
else
return (-1);
} else {
if (b->base[b->off++] != *p)
return (-1);
}
}
}
return (0);
}
int
blob_pack(blob_t *b, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
return (blob_fmt(b, 1, fmt, &ap));
}
int
blob_unpack(blob_t *b, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
return (blob_fmt(b, 0, fmt, &ap));
}
int
blob_seek(blob_t *b, int off, int whence)
{
if (whence == SEEK_CUR)
off += b->off;
else if (whence == SEEK_END)
off += b->end;
if (off < 0 || off > b->end)
return (-1);
return ((b->off = off));
}
int
blob_index(blob_t *b, const void *buf, int len)
{
int i;
for (i = b->off; i <= b->end - len; i++) {
if (memcmp(b->base + i, buf, len) == 0)
return (i);
}
return (-1);
}
int
blob_rindex(blob_t *b, const void *buf, int len)
{
int i;
for (i = b->end - len; i >= 0; i--) {
if (memcmp(b->base + i, buf, len) == 0)
return (i);
}
return (-1);
}
int
blob_print(blob_t *b, char *style, int len)
{
struct blob_printer *bp;
for (bp = blob_printers; bp->name != NULL; bp++) {
if (strcmp(bp->name, style) == 0)
bp->print(b);
}
return (0);
}
int
blob_sprint(blob_t *b, char *style, int len, char *dst, int size)
{
return (0);
}
blob_t *
blob_free(blob_t *b)
{
if (b->size)
bl_free(b->base);
bl_free(b);
return (NULL);
}
int
blob_register_alloc(size_t size, void *(bmalloc)(size_t),
void (*bfree)(void *), void *(*brealloc)(void *, size_t))
{
bl_size = size;
if (bmalloc != NULL)
bl_malloc = bmalloc;
if (bfree != NULL)
bl_free = bfree;
if (brealloc != NULL)
bl_realloc = brealloc;
return (0);
}
int
blob_register_pack(char c, blob_fmt_cb fmt_cb)
{
if (blob_ascii_fmt[(int)c] == NULL) {
blob_ascii_fmt[(int)c] = fmt_cb;
return (0);
}
return (-1);
}
static int
fmt_D(int pack, int len, blob_t *b, va_list *ap)
{
if (len) return (-1);
if (pack) {
uint32_t n = va_arg(*ap, uint32_t);
n = htonl(n);
if (blob_write(b, &n, sizeof(n)) < 0)
return (-1);
} else {
uint32_t *n = va_arg(*ap, uint32_t *);
if (blob_read(b, n, sizeof(*n)) != sizeof(*n))
return (-1);
*n = ntohl(*n);
}
return (0);
}
static int
fmt_H(int pack, int len, blob_t *b, va_list *ap)
{
if (len) return (-1);
if (pack) {
uint16_t n = va_arg(*ap, int);
n = htons(n);
if (blob_write(b, &n, sizeof(n)) < 0)
return (-1);
} else {
uint16_t *n = va_arg(*ap, uint16_t *);
if (blob_read(b, n, sizeof(*n)) != sizeof(*n))
return (-1);
*n = ntohs(*n);
}
return (0);
}
static int
fmt_b(int pack, int len, blob_t *b, va_list *ap)
{
void *p = va_arg(*ap, void *);
if (len <= 0) return (-1);
if (pack)
return (blob_write(b, p, len));
else
return (blob_read(b, p, len));
}
static int
fmt_c(int pack, int len, blob_t *b, va_list *ap)
{
if (len) return (-1);
if (pack) {
uint8_t n = va_arg(*ap, int);
return (blob_write(b, &n, sizeof(n)));
} else {
uint8_t *n = va_arg(*ap, uint8_t *);
return (blob_read(b, n, sizeof(*n)));
}
}
static int
fmt_d(int pack, int len, blob_t *b, va_list *ap)
{
if (len) return (-1);
if (pack) {
uint32_t n = va_arg(*ap, uint32_t);
return (blob_write(b, &n, sizeof(n)));
} else {
uint32_t *n = va_arg(*ap, uint32_t *);
return (blob_read(b, n, sizeof(*n)));
}
}
static int
fmt_h(int pack, int len, blob_t *b, va_list *ap)
{
if (len) return (-1);
if (pack) {
uint16_t n = va_arg(*ap, int);
return (blob_write(b, &n, sizeof(n)));
} else {
uint16_t *n = va_arg(*ap, uint16_t *);
return (blob_read(b, n, sizeof(*n)));
}
}
static int
fmt_s(int pack, int len, blob_t *b, va_list *ap)
{
char *p = va_arg(*ap, char *);
char c = '\0';
int i, end;
if (pack) {
if (len > 0) {
if ((c = p[len - 1]) != '\0')
p[len - 1] = '\0';
} else
len = strlen(p) + 1;
if (blob_write(b, p, len) > 0) {
if (c != '\0')
p[len - 1] = c;
return (len);
}
} else {
if (len <= 0) return (-1);
if ((end = b->end - b->off) < len)
end = len;
for (i = 0; i < end; i++) {
if ((p[i] = b->base[b->off + i]) == '\0') {
b->off += i + 1;
return (i);
}
}
}
return (-1);
}
static void
print_hexl(blob_t *b)
{
u_int i, j, jm, len;
u_char *p;
int c;
p = b->base + b->off;
len = b->end - b->off;
printf("\n");
for (i = 0; i < len; i += 0x10) {
printf(" %04x: ", (u_int)(i + b->off));
jm = len - i;
jm = jm > 16 ? 16 : jm;
for (j = 0; j < jm; j++) {
printf((j % 2) ? "%02x " : "%02x", (u_int)p[i + j]);
}
for (; j < 16; j++) {
printf((j % 2) ? " " : " ");
}
printf(" ");
for (j = 0; j < jm; j++) {
c = p[i + j];
printf("%c", isprint(c) ? c : '.');
}
printf("\n");
}
}
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