From 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 03:47:29 +0200 Subject: Adding upstream version 115.8.0esr. Signed-off-by: Daniel Baumann --- gfx/ots/src/ots.cc | 1151 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1151 insertions(+) create mode 100644 gfx/ots/src/ots.cc (limited to 'gfx/ots/src/ots.cc') diff --git a/gfx/ots/src/ots.cc b/gfx/ots/src/ots.cc new file mode 100644 index 0000000000..73b1d235cf --- /dev/null +++ b/gfx/ots/src/ots.cc @@ -0,0 +1,1151 @@ +// Copyright (c) 2009-2017 The OTS Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "ots.h" + +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "../RLBoxWOFF2Host.h" + +// The OpenType Font File +// http://www.microsoft.com/typography/otspec/otff.htm + +#include "avar.h" +#include "cff.h" +#include "cmap.h" +#include "colr.h" +#include "cpal.h" +#include "cvar.h" +#include "cvt.h" +#include "fpgm.h" +#include "fvar.h" +#include "gasp.h" +#include "gdef.h" +#include "glyf.h" +#include "gpos.h" +#include "gsub.h" +#include "gvar.h" +#include "hdmx.h" +#include "head.h" +#include "hhea.h" +#include "hmtx.h" +#include "hvar.h" +#include "kern.h" +#include "loca.h" +#include "ltsh.h" +#include "math_.h" +#include "maxp.h" +#include "mvar.h" +#include "name.h" +#include "os2.h" +#include "ots.h" +#include "post.h" +#include "prep.h" +#include "stat.h" +#include "vdmx.h" +#include "vhea.h" +#include "vmtx.h" +#include "vorg.h" +#include "vvar.h" + +// Graphite tables +#ifdef OTS_GRAPHITE +#include "feat.h" +#include "glat.h" +#include "gloc.h" +#include "sile.h" +#include "silf.h" +#include "sill.h" +#endif + +namespace ots { + +struct Arena { + public: + ~Arena() { + for (auto& hunk : hunks_) { + delete[] hunk; + } + } + + uint8_t* Allocate(size_t length) { + uint8_t* p = new uint8_t[length]; + hunks_.push_back(p); + return p; + } + + private: + std::vector hunks_; +}; + +bool CheckTag(uint32_t tag_value) { + for (unsigned i = 0; i < 4; ++i) { + const uint32_t check = tag_value & 0xff; + if (check < 32 || check > 126) { + return false; // non-ASCII character found. + } + tag_value >>= 8; + } + return true; +} + +}; // namespace ots + +namespace { + +#define OTS_MSG_TAG_(level,otf_,msg_,tag_) \ + (OTS_MESSAGE_(level,otf_,"%c%c%c%c: %s", OTS_UNTAG(tag_), msg_), false) + +// Generate a message with or without a table tag, when 'header' is the FontFile pointer +#define OTS_FAILURE_MSG_TAG(msg_,tag_) OTS_MSG_TAG_(0, header, msg_, tag_) +#define OTS_FAILURE_MSG_HDR(...) OTS_FAILURE_MSG_(header, __VA_ARGS__) +#define OTS_WARNING_MSG_HDR(...) OTS_WARNING_MSG_(header, __VA_ARGS__) + + +const struct { + uint32_t tag; + bool required; +} supported_tables[] = { + { OTS_TAG_MAXP, true }, + { OTS_TAG_HEAD, true }, + { OTS_TAG_OS2, true }, + { OTS_TAG_CMAP, true }, + { OTS_TAG_HHEA, true }, + { OTS_TAG_HMTX, true }, + { OTS_TAG_NAME, true }, + { OTS_TAG_POST, true }, + { OTS_TAG_LOCA, false }, + { OTS_TAG_GLYF, false }, + { OTS_TAG_CFF, false }, + { OTS_TAG_VDMX, false }, + { OTS_TAG_HDMX, false }, + { OTS_TAG_GASP, false }, + { OTS_TAG_CVT, false }, + { OTS_TAG_FPGM, false }, + { OTS_TAG_PREP, false }, + { OTS_TAG_LTSH, false }, + { OTS_TAG_VORG, false }, + { OTS_TAG_KERN, false }, + // We need to parse fvar table before other tables that may need to know + // the number of variation axes (if any) + { OTS_TAG_FVAR, false }, + { OTS_TAG_AVAR, false }, + { OTS_TAG_CVAR, false }, + { OTS_TAG_GVAR, false }, + { OTS_TAG_HVAR, false }, + { OTS_TAG_MVAR, false }, + { OTS_TAG_STAT, false }, + { OTS_TAG_VVAR, false }, + { OTS_TAG_CFF2, false }, + // Color font tables. + // We need to parse CPAL before COLR so that the number of palette entries + // is known; and these tables follow fvar because COLR may use variations. + { OTS_TAG_CPAL, false }, + { OTS_TAG_COLR, false }, + // We need to parse GDEF table in advance of parsing GSUB/GPOS tables + // because they could refer GDEF table. + { OTS_TAG_GDEF, false }, + { OTS_TAG_GPOS, false }, + { OTS_TAG_GSUB, false }, + { OTS_TAG_VHEA, false }, + { OTS_TAG_VMTX, false }, + { OTS_TAG_MATH, false }, + // Graphite tables +#ifdef OTS_GRAPHITE + { OTS_TAG_GLOC, false }, + { OTS_TAG_GLAT, false }, + { OTS_TAG_FEAT, false }, + { OTS_TAG_SILF, false }, + { OTS_TAG_SILE, false }, + { OTS_TAG_SILL, false }, +#endif + { 0, false }, +}; + +bool ValidateVersionTag(ots::Font *font) { + switch (font->version) { + case 0x000010000: + case OTS_TAG('O','T','T','O'): + return true; + case OTS_TAG('t','r','u','e'): + font->version = 0x000010000; + return true; + default: + return false; + } +} + +bool ProcessGeneric(ots::FontFile *header, + ots::Font *font, + uint32_t signature, + ots::OTSStream *output, + const uint8_t *data, size_t length, + const std::vector& tables, + ots::Buffer& file); + +bool ProcessTTF(ots::FontFile *header, + ots::Font *font, + ots::OTSStream *output, const uint8_t *data, size_t length, + uint32_t offset = 0) { + ots::Buffer file(data + offset, length - offset); + + if (offset > length) { + return OTS_FAILURE_MSG_HDR("offset beyond end of file"); + } + + // we disallow all files > 1GB in size for sanity. + if (length > 1024 * 1024 * 1024) { + return OTS_FAILURE_MSG_HDR("file exceeds 1GB"); + } + + if (!file.ReadU32(&font->version)) { + return OTS_FAILURE_MSG_HDR("error reading sfntVersion"); + } + if (!ValidateVersionTag(font)) { + return OTS_FAILURE_MSG_HDR("invalid sfntVersion: %d", font->version); + } + + if (!file.ReadU16(&font->num_tables) || + !file.ReadU16(&font->search_range) || + !file.ReadU16(&font->entry_selector) || + !file.ReadU16(&font->range_shift)) { + return OTS_FAILURE_MSG_HDR("error reading table directory search header"); + } + + // search_range is (Maximum power of 2 <= numTables) x 16. Thus, to avoid + // overflow num_tables is, at most, 2^16 / 16 = 2^12 + if (font->num_tables >= 4096 || font->num_tables < 1) { + return OTS_FAILURE_MSG_HDR("excessive (or zero) number of tables"); + } + + unsigned max_pow2 = 0; + while (1u << (max_pow2 + 1) <= font->num_tables) { + max_pow2++; + } + const uint16_t expected_search_range = (1u << max_pow2) << 4; + + // Don't call ots_failure() here since ~25% of fonts (250+ fonts) in + // http://www.princexml.com/fonts/ have unexpected search_range value. + if (font->search_range != expected_search_range) { + OTS_WARNING_MSG_HDR("bad table directory searchRange"); + font->search_range = expected_search_range; // Fix the value. + } + + // entry_selector is Log2(maximum power of 2 <= numTables) + if (font->entry_selector != max_pow2) { + OTS_WARNING_MSG_HDR("bad table directory entrySelector"); + font->entry_selector = max_pow2; // Fix the value. + } + + // range_shift is NumTables x 16-searchRange. We know that 16*num_tables + // doesn't over flow because we range checked it above. Also, we know that + // it's > font->search_range by construction of search_range. + const uint16_t expected_range_shift = + 16 * font->num_tables - font->search_range; + if (font->range_shift != expected_range_shift) { + OTS_WARNING_MSG_HDR("bad table directory rangeShift"); + font->range_shift = expected_range_shift; // the same as above. + } + + // Next up is the list of tables. + std::vector tables; + + for (unsigned i = 0; i < font->num_tables; ++i) { + ots::TableEntry table; + if (!file.ReadU32(&table.tag) || + !file.ReadU32(&table.chksum) || + !file.ReadU32(&table.offset) || + !file.ReadU32(&table.length)) { + return OTS_FAILURE_MSG_HDR("error reading table directory"); + } + + table.uncompressed_length = table.length; + tables.push_back(table); + } + + return ProcessGeneric(header, font, font->version, output, data, length, + tables, file); +} + +bool ProcessTTC(ots::FontFile *header, + ots::OTSStream *output, + const uint8_t *data, + size_t length, + uint32_t index) { + ots::Buffer file(data, length); + + // we disallow all files > 1GB in size for sanity. + if (length > 1024 * 1024 * 1024) { + return OTS_FAILURE_MSG_HDR("file exceeds 1GB"); + } + + uint32_t ttc_tag; + if (!file.ReadU32(&ttc_tag)) { + return OTS_FAILURE_MSG_HDR("Error reading TTC tag"); + } + if (ttc_tag != OTS_TAG('t','t','c','f')) { + return OTS_FAILURE_MSG_HDR("Invalid TTC tag"); + } + + uint32_t ttc_version; + if (!file.ReadU32(&ttc_version)) { + return OTS_FAILURE_MSG_HDR("Error reading TTC version"); + } + if (ttc_version != 0x00010000 && ttc_version != 0x00020000) { + return OTS_FAILURE_MSG_HDR("Invalid TTC version"); + } + + uint32_t num_fonts; + if (!file.ReadU32(&num_fonts)) { + return OTS_FAILURE_MSG_HDR("Error reading number of TTC fonts"); + } + // Limit the allowed number of subfonts to have same memory allocation. + if (num_fonts > 0x10000) { + return OTS_FAILURE_MSG_HDR("Too many fonts in TTC"); + } + + std::vector offsets(num_fonts); + for (unsigned i = 0; i < num_fonts; i++) { + if (!file.ReadU32(&offsets[i])) { + return OTS_FAILURE_MSG_HDR("Error reading offset to OffsetTable"); + } + } + + if (ttc_version == 0x00020000) { + // We don't care about these fields of the header: + // uint32_t dsig_tag, dsig_length, dsig_offset + if (!file.Skip(3 * 4)) { + return OTS_FAILURE_MSG_HDR("Error reading DSIG offset and length in TTC font"); + } + } + + if (index == static_cast(-1)) { + if (!output->WriteU32(ttc_tag) || + !output->WriteU32(0x00010000) || + !output->WriteU32(num_fonts) || + !output->Seek((3 + num_fonts) * 4)) { + return OTS_FAILURE_MSG_HDR("Error writing output"); + } + + // Keep references to the fonts processed in the loop below, as we need + // them for reused tables. + std::vector fonts(num_fonts, ots::Font(header)); + + for (unsigned i = 0; i < num_fonts; i++) { + uint32_t out_offset = output->Tell(); + if (!output->Seek((3 + i) * 4) || + !output->WriteU32(out_offset) || + !output->Seek(out_offset)) { + return OTS_FAILURE_MSG_HDR("Error writing output"); + } + if (!ProcessTTF(header, &fonts[i], output, data, length, offsets[i])) { + return false; + } + } + + return true; + } else { + if (index >= num_fonts) { + return OTS_FAILURE_MSG_HDR("Requested font index is bigger than the number of fonts in the TTC file"); + } + + ots::Font font(header); + return ProcessTTF(header, &font, output, data, length, offsets[index]); + } +} + +bool ProcessWOFF(ots::FontFile *header, + ots::Font *font, + ots::OTSStream *output, const uint8_t *data, size_t length) { + ots::Buffer file(data, length); + + // we disallow all files > 1GB in size for sanity. + if (length > 1024 * 1024 * 1024) { + return OTS_FAILURE_MSG_HDR("file exceeds 1GB"); + } + + uint32_t woff_tag; + if (!file.ReadU32(&woff_tag)) { + return OTS_FAILURE_MSG_HDR("error reading WOFF marker"); + } + + if (woff_tag != OTS_TAG('w','O','F','F')) { + return OTS_FAILURE_MSG_HDR("invalid WOFF marker"); + } + + if (!file.ReadU32(&font->version)) { + return OTS_FAILURE_MSG_HDR("error reading sfntVersion"); + } + if (!ValidateVersionTag(font)) { + return OTS_FAILURE_MSG_HDR("invalid sfntVersion: %d", font->version); + } + + uint32_t reported_length; + if (!file.ReadU32(&reported_length) || length != reported_length) { + return OTS_FAILURE_MSG_HDR("incorrect file size in WOFF header"); + } + + if (!file.ReadU16(&font->num_tables) || !font->num_tables) { + return OTS_FAILURE_MSG_HDR("error reading number of tables"); + } + + uint16_t reserved_value; + if (!file.ReadU16(&reserved_value) || reserved_value) { + return OTS_FAILURE_MSG_HDR("error in reserved field of WOFF header"); + } + + uint32_t reported_total_sfnt_size; + if (!file.ReadU32(&reported_total_sfnt_size)) { + return OTS_FAILURE_MSG_HDR("error reading total sfnt size"); + } + + // We don't care about these fields of the header: + // uint16_t major_version, minor_version + if (!file.Skip(2 * 2)) { + return OTS_FAILURE_MSG_HDR("Failed to read 'majorVersion' or 'minorVersion'"); + } + + // Checks metadata block size. + uint32_t meta_offset; + uint32_t meta_length; + uint32_t meta_length_orig; + if (!file.ReadU32(&meta_offset) || + !file.ReadU32(&meta_length) || + !file.ReadU32(&meta_length_orig)) { + return OTS_FAILURE_MSG_HDR("Failed to read header metadata block fields"); + } + if (meta_offset) { + if (meta_offset >= length || length - meta_offset < meta_length) { + return OTS_FAILURE_MSG_HDR("Invalid metadata block offset or length"); + } + } + + // Checks private data block size. + uint32_t priv_offset; + uint32_t priv_length; + if (!file.ReadU32(&priv_offset) || + !file.ReadU32(&priv_length)) { + return OTS_FAILURE_MSG_HDR("Failed to read header private block fields"); + } + if (priv_offset) { + if (priv_offset >= length || length - priv_offset < priv_length) { + return OTS_FAILURE_MSG_HDR("Invalid private block offset or length"); + } + } + + // Next up is the list of tables. + std::vector tables; + + uint32_t first_index = 0; + uint32_t last_index = 0; + // Size of sfnt header plus size of table records. + uint64_t total_sfnt_size = 12 + 16 * font->num_tables; + for (unsigned i = 0; i < font->num_tables; ++i) { + ots::TableEntry table; + if (!file.ReadU32(&table.tag) || + !file.ReadU32(&table.offset) || + !file.ReadU32(&table.length) || + !file.ReadU32(&table.uncompressed_length) || + !file.ReadU32(&table.chksum)) { + return OTS_FAILURE_MSG_HDR("error reading table directory"); + } + + total_sfnt_size += ots::Round4(table.uncompressed_length); + if (total_sfnt_size > std::numeric_limits::max()) { + return OTS_FAILURE_MSG_HDR("sfnt size overflow"); + } + tables.push_back(table); + if (i == 0 || tables[first_index].offset > table.offset) + first_index = i; + if (i == 0 || tables[last_index].offset < table.offset) + last_index = i; + } + + if (reported_total_sfnt_size != total_sfnt_size) { + return OTS_FAILURE_MSG_HDR("uncompressed sfnt size mismatch"); + } + + // Table data must follow immediately after the header. + if (tables[first_index].offset != ots::Round4(file.offset())) { + return OTS_FAILURE_MSG_HDR("junk before tables in WOFF file"); + } + + if (tables[last_index].offset >= length || + length - tables[last_index].offset < tables[last_index].length) { + return OTS_FAILURE_MSG_HDR("invalid table location/size"); + } + // Blocks must follow immediately after the previous block. + // (Except for padding with a maximum of three null bytes) + uint64_t block_end = ots::Round4( + static_cast(tables[last_index].offset) + + static_cast(tables[last_index].length)); + if (block_end > std::numeric_limits::max()) { + return OTS_FAILURE_MSG_HDR("invalid table location/size"); + } + if (meta_offset) { + if (block_end != meta_offset) { + return OTS_FAILURE_MSG_HDR("Invalid metadata block offset"); + } + block_end = ots::Round4(static_cast(meta_offset) + + static_cast(meta_length)); + if (block_end > std::numeric_limits::max()) { + return OTS_FAILURE_MSG_HDR("Invalid metadata block length"); + } + } + if (priv_offset) { + if (block_end != priv_offset) { + return OTS_FAILURE_MSG_HDR("Invalid private block offset"); + } + block_end = ots::Round4(static_cast(priv_offset) + + static_cast(priv_length)); + if (block_end > std::numeric_limits::max()) { + return OTS_FAILURE_MSG_HDR("Invalid private block length"); + } + } + if (block_end != ots::Round4(length)) { + return OTS_FAILURE_MSG_HDR("File length mismatch (trailing junk?)"); + } + + return ProcessGeneric(header, font, woff_tag, output, data, length, tables, file); +} + +bool ProcessWOFF2(ots::FontFile* header, ots::OTSStream* output, + const uint8_t* data, size_t length, uint32_t index) { + return RLBoxProcessWOFF2(header, output, data, length, index, ProcessTTC, ProcessTTF); +} + +ots::TableAction GetTableAction(const ots::FontFile *header, uint32_t tag) { + ots::TableAction action = header->context->GetTableAction(tag); + + if (action == ots::TABLE_ACTION_DEFAULT) { + action = ots::TABLE_ACTION_DROP; + + for (unsigned i = 0; ; ++i) { + if (supported_tables[i].tag == 0) break; + + if (supported_tables[i].tag == tag) { + action = ots::TABLE_ACTION_SANITIZE; + break; + } + } + } + + assert(action != ots::TABLE_ACTION_DEFAULT); // Should never return this. + return action; +} + +bool GetTableData(const uint8_t *data, + const ots::TableEntry& table, + ots::Arena &arena, + size_t *table_length, + const uint8_t **table_data) { + if (table.uncompressed_length != table.length) { + // Compressed table. Need to uncompress into memory first. + *table_length = table.uncompressed_length; + *table_data = arena.Allocate(*table_length); + uLongf dest_len = *table_length; + int r = uncompress((Bytef*) *table_data, &dest_len, + data + table.offset, table.length); + if (r != Z_OK || dest_len != *table_length) { + return false; + } + } else { + // Uncompressed table. We can process directly from memory. + *table_data = data + table.offset; + *table_length = table.length; + } + + return true; +} + +bool ProcessGeneric(ots::FontFile *header, + ots::Font *font, + uint32_t signature, + ots::OTSStream *output, + const uint8_t *data, size_t length, + const std::vector& tables, + ots::Buffer& file) { + const size_t data_offset = file.offset(); + + uint32_t uncompressed_sum = 0; + + for (unsigned i = 0; i < font->num_tables; ++i) { + // the tables must be sorted by tag (when taken as big-endian numbers). + // This also remove the possibility of duplicate tables. + if (i) { + const uint32_t this_tag = tables[i].tag; + const uint32_t prev_tag = tables[i - 1].tag; + if (this_tag <= prev_tag) { + OTS_WARNING_MSG_HDR("Table directory is not correctly ordered"); + } + } + + // all tag names must be built from printable ASCII characters + if (!ots::CheckTag(tables[i].tag)) { + OTS_WARNING_MSG_HDR("Invalid table tag: 0x%X", tables[i].tag); + } + + // tables must be 4-byte aligned + if (tables[i].offset & 3) { + return OTS_FAILURE_MSG_TAG("misaligned table", tables[i].tag); + } + + // and must be within the file + if (tables[i].offset < data_offset || tables[i].offset >= length) { + return OTS_FAILURE_MSG_TAG("invalid table offset", tables[i].tag); + } + // disallow all tables with a zero length + if (tables[i].length < 1) { + // Note: malayalam.ttf has zero length CVT table... + return OTS_FAILURE_MSG_TAG("zero-length table", tables[i].tag); + } + // disallow all tables with a length > 1GB + if (tables[i].length > 1024 * 1024 * 1024) { + return OTS_FAILURE_MSG_TAG("table length exceeds 1GB", tables[i].tag); + } + // disallow tables where the uncompressed size is < the compressed size. + if (tables[i].uncompressed_length < tables[i].length) { + return OTS_FAILURE_MSG_TAG("invalid compressed table", tables[i].tag); + } + if (tables[i].uncompressed_length > tables[i].length) { + // We'll probably be decompressing this table. + + // disallow all tables which decompress to > OTS_MAX_DECOMPRESSED_TABLE_SIZE + if (tables[i].uncompressed_length > OTS_MAX_DECOMPRESSED_TABLE_SIZE) { + return OTS_FAILURE_MSG_HDR("%c%c%c%c: decompressed table length exceeds %gMB", + OTS_UNTAG(tables[i].tag), + OTS_MAX_DECOMPRESSED_TABLE_SIZE / (1024.0 * 1024.0)); + } + if (uncompressed_sum + tables[i].uncompressed_length < uncompressed_sum) { + return OTS_FAILURE_MSG_TAG("overflow of decompressed sum", tables[i].tag); + } + + uncompressed_sum += tables[i].uncompressed_length; + } + // since we required that the file be < 1GB in length, and that the table + // length is < 1GB, the following addtion doesn't overflow + uint32_t end_byte = tables[i].offset + tables[i].length; + // Tables in the WOFF file must be aligned 4-byte boundary. + if (signature == OTS_TAG('w','O','F','F')) { + end_byte = ots::Round4(end_byte); + } + if (!end_byte || end_byte > length) { + return OTS_FAILURE_MSG_TAG("table overruns end of file", tables[i].tag); + } + } + + // All decompressed tables decompressed must be <= OTS_MAX_DECOMPRESSED_FILE_SIZE. + if (uncompressed_sum > OTS_MAX_DECOMPRESSED_FILE_SIZE) { + return OTS_FAILURE_MSG_HDR("decompressed sum exceeds %gMB", + OTS_MAX_DECOMPRESSED_FILE_SIZE / (1024.0 * 1024.0)); + } + + if (uncompressed_sum > output->size()) { + return OTS_FAILURE_MSG_HDR("decompressed sum exceeds output size (%gMB)", output->size() / (1024.0 * 1024.0)); + } + + // check that the tables are not overlapping. + std::vector > overlap_checker; + for (unsigned i = 0; i < font->num_tables; ++i) { + overlap_checker.push_back( + std::make_pair(tables[i].offset, static_cast(1) /* start */)); + overlap_checker.push_back( + std::make_pair(tables[i].offset + tables[i].length, + static_cast(0) /* end */)); + } + std::sort(overlap_checker.begin(), overlap_checker.end()); + int overlap_count = 0; + for (unsigned i = 0; i < overlap_checker.size(); ++i) { + overlap_count += (overlap_checker[i].second ? 1 : -1); + if (overlap_count > 1) { + return OTS_FAILURE_MSG_HDR("overlapping tables"); + } + } + + std::map table_map; + for (unsigned i = 0; i < font->num_tables; ++i) { + table_map[tables[i].tag] = tables[i]; + } + + ots::Arena arena; + // Parse known tables first as we need to parse them in specific order. + for (unsigned i = 0; ; ++i) { + if (supported_tables[i].tag == 0) break; + + uint32_t tag = supported_tables[i].tag; + const auto &it = table_map.find(tag); + if (it == table_map.cend()) { + if (supported_tables[i].required) { + return OTS_FAILURE_MSG_TAG("missing required table", tag); + } + } else { + if (!font->ParseTable(it->second, data, arena)) { + return OTS_FAILURE_MSG_TAG("Failed to parse table", tag); + } + } + } + + // Then parse any tables left. + for (const auto &table_entry : tables) { + if (!font->GetTable(table_entry.tag)) { + if (!font->ParseTable(table_entry, data, arena)) { + return OTS_FAILURE_MSG_TAG("Failed to parse table", table_entry.tag); + } + } + } + +#ifdef OTS_SYNTHESIZE_MISSING_GVAR + // If there was an fvar table but no gvar, synthesize an empty gvar to avoid + // issues with rasterizers (e.g. Core Text) that assume it must be present. + if (font->GetTable(OTS_TAG_FVAR) && !font->GetTable(OTS_TAG_GVAR)) { + ots::TableEntry table_entry{ OTS_TAG_GVAR, 0, 0, 0, 0 }; + const auto &it = font->file->tables.find(table_entry); + if (it != font->file->tables.end()) { + table_map[OTS_TAG_GVAR] = table_entry; + font->AddTable(table_entry, it->second); + } else { + ots::OpenTypeGVAR *gvar = new ots::OpenTypeGVAR(font, OTS_TAG_GVAR); + if (gvar->InitEmpty()) { + table_map[OTS_TAG_GVAR] = table_entry; + font->AddTable(table_entry, gvar); + } else { + delete gvar; + } + } + } +#endif + + ots::Table *glyf = font->GetTable(OTS_TAG_GLYF); + ots::Table *loca = font->GetTable(OTS_TAG_LOCA); + ots::Table *cff = font->GetTable(OTS_TAG_CFF); + ots::Table *cff2 = font->GetTable(OTS_TAG_CFF2); + + if (glyf && loca) { + if (font->version != 0x000010000) { + OTS_WARNING_MSG_HDR("wrong sfntVersion for glyph data"); + font->version = 0x000010000; + } + if (cff) + cff->Drop("font contains both CFF and glyf/loca tables"); + if (cff2) + cff2->Drop("font contains both CFF and glyf/loca tables"); + } else if (cff || cff2) { + if (font->version != OTS_TAG('O','T','T','O')) { + OTS_WARNING_MSG_HDR("wrong sfntVersion for glyph data"); + font->version = OTS_TAG('O','T','T','O'); + } + if (glyf) + glyf->Drop("font contains both CFF and glyf tables"); + if (loca) + loca->Drop("font contains both CFF and loca tables"); + } else if (font->GetTable(OTS_TAG('C','B','D','T')) && + font->GetTable(OTS_TAG('C','B','L','C'))) { + // We don't sanitize bitmap tables, but don’t reject bitmap-only fonts if + // we are asked to pass them thru. + } else { + return OTS_FAILURE_MSG_HDR("no supported glyph data table(s) present"); + } + + uint16_t num_output_tables = 0; + for (const auto &it : table_map) { + ots::Table *table = font->GetTable(it.first); + if (table) + num_output_tables++; + } + + uint16_t max_pow2 = 0; + while (1u << (max_pow2 + 1) <= num_output_tables) { + max_pow2++; + } + const uint16_t output_search_range = (1u << max_pow2) << 4; + + // most of the errors here are highly unlikely - they'd only occur if the + // output stream returns a failure, e.g. lack of space to write + output->ResetChecksum(); + if (!output->WriteU32(font->version) || + !output->WriteU16(num_output_tables) || + !output->WriteU16(output_search_range) || + !output->WriteU16(max_pow2) || + !output->WriteU16((num_output_tables << 4) - output_search_range)) { + return OTS_FAILURE_MSG_HDR("error writing output"); + } + const uint32_t offset_table_chksum = output->chksum(); + + const size_t table_record_offset = output->Tell(); + if (!output->Pad(16 * num_output_tables)) { + return OTS_FAILURE_MSG_HDR("error writing output"); + } + + std::vector out_tables; + + size_t head_table_offset = 0; + for (const auto &it : table_map) { + uint32_t input_offset = it.second.offset; + const auto &ot = header->table_entries.find(input_offset); + if (ot != header->table_entries.end()) { + ots::TableEntry out = ot->second; + if (out.tag == OTS_TAG('h','e','a','d')) { + head_table_offset = out.offset; + } + out_tables.push_back(out); + } else { + ots::TableEntry out; + out.tag = it.first; + out.offset = output->Tell(); + + if (out.tag == OTS_TAG('h','e','a','d')) { + head_table_offset = out.offset; + } + + ots::Table *table = font->GetTable(out.tag); + if (table) { + output->ResetChecksum(); + if (!table->Serialize(output)) { + return OTS_FAILURE_MSG_TAG("Failed to serialize table", out.tag); + } + + const size_t end_offset = output->Tell(); + if (end_offset <= out.offset) { + // paranoid check. |end_offset| is supposed to be greater than the offset, + // as long as the Tell() interface is implemented correctly. + return OTS_FAILURE_MSG_TAG("Table is empty or have -ve size", out.tag); + } + out.length = end_offset - out.offset; + + // align tables to four bytes + if (!output->Pad((4 - (end_offset & 3)) % 4)) { + return OTS_FAILURE_MSG_TAG("Failed to pad table to 4 bytes", out.tag); + } + out.chksum = output->chksum(); + out_tables.push_back(out); + header->table_entries[input_offset] = out; + } + } + } + + const size_t end_of_file = output->Tell(); + + // Need to sort the output tables for inclusion in the file + std::sort(out_tables.begin(), out_tables.end()); + if (!output->Seek(table_record_offset)) { + return OTS_FAILURE_MSG_HDR("error writing output"); + } + + output->ResetChecksum(); + uint32_t tables_chksum = 0; + for (unsigned i = 0; i < out_tables.size(); ++i) { + if (!output->WriteU32(out_tables[i].tag) || + !output->WriteU32(out_tables[i].chksum) || + !output->WriteU32(out_tables[i].offset) || + !output->WriteU32(out_tables[i].length)) { + return OTS_FAILURE_MSG_HDR("error writing output"); + } + tables_chksum += out_tables[i].chksum; + } + const uint32_t table_record_chksum = output->chksum(); + + // http://www.microsoft.com/typography/otspec/otff.htm + const uint32_t file_chksum + = offset_table_chksum + tables_chksum + table_record_chksum; + const uint32_t chksum_magic = static_cast(0xb1b0afba) - file_chksum; + + // seek into the 'head' table and write in the checksum magic value + if (!head_table_offset) { + return OTS_FAILURE_MSG_HDR("internal error!"); + } + if (!output->Seek(head_table_offset + 8)) { + return OTS_FAILURE_MSG_HDR("error writing output"); + } + if (!output->WriteU32(chksum_magic)) { + return OTS_FAILURE_MSG_HDR("error writing output"); + } + + if (!output->Seek(end_of_file)) { + return OTS_FAILURE_MSG_HDR("error writing output"); + } + + return true; +} + +bool IsGraphiteTag(uint32_t tag) { + if (tag == OTS_TAG_FEAT || + tag == OTS_TAG_GLAT || + tag == OTS_TAG_GLOC || + tag == OTS_TAG_SILE || + tag == OTS_TAG_SILF || + tag == OTS_TAG_SILL) { + return true; + } + return false; +} + +bool IsVariationsTag(uint32_t tag) { + if (tag == OTS_TAG_AVAR || + tag == OTS_TAG_CVAR || + tag == OTS_TAG_FVAR || + tag == OTS_TAG_GVAR || + tag == OTS_TAG_HVAR || + tag == OTS_TAG_MVAR || + tag == OTS_TAG_STAT || + tag == OTS_TAG_VVAR) { + return true; + } + return false; +} + +} // namespace + +namespace ots { + +FontFile::~FontFile() { + for (const auto& it : tables) { + delete it.second; + } + tables.clear(); +} + +bool Font::ParseTable(const TableEntry& table_entry, const uint8_t* data, + Arena &arena) { + uint32_t tag = table_entry.tag; + TableAction action = GetTableAction(file, tag); + if (action == TABLE_ACTION_DROP) { + return true; + } + + const auto &it = file->tables.find(table_entry); + if (it != file->tables.end()) { + m_tables[tag] = it->second; + return true; + } + + Table *table = NULL; + bool ret = false; + + if (action == TABLE_ACTION_PASSTHRU) { + table = new TablePassthru(this, tag); + } else { + switch (tag) { + case OTS_TAG_AVAR: table = new OpenTypeAVAR(this, tag); break; + case OTS_TAG_CFF: table = new OpenTypeCFF(this, tag); break; + case OTS_TAG_CFF2: table = new OpenTypeCFF2(this, tag); break; + case OTS_TAG_CMAP: table = new OpenTypeCMAP(this, tag); break; + case OTS_TAG_COLR: table = new OpenTypeCOLR(this, tag); break; + case OTS_TAG_CPAL: table = new OpenTypeCPAL(this, tag); break; + case OTS_TAG_CVAR: table = new OpenTypeCVAR(this, tag); break; + case OTS_TAG_CVT: table = new OpenTypeCVT(this, tag); break; + case OTS_TAG_FPGM: table = new OpenTypeFPGM(this, tag); break; + case OTS_TAG_FVAR: table = new OpenTypeFVAR(this, tag); break; + case OTS_TAG_GASP: table = new OpenTypeGASP(this, tag); break; + case OTS_TAG_GDEF: table = new OpenTypeGDEF(this, tag); break; + case OTS_TAG_GLYF: table = new OpenTypeGLYF(this, tag); break; + case OTS_TAG_GPOS: table = new OpenTypeGPOS(this, tag); break; + case OTS_TAG_GSUB: table = new OpenTypeGSUB(this, tag); break; + case OTS_TAG_GVAR: table = new OpenTypeGVAR(this, tag); break; + case OTS_TAG_HDMX: table = new OpenTypeHDMX(this, tag); break; + case OTS_TAG_HEAD: table = new OpenTypeHEAD(this, tag); break; + case OTS_TAG_HHEA: table = new OpenTypeHHEA(this, tag); break; + case OTS_TAG_HMTX: table = new OpenTypeHMTX(this, tag); break; + case OTS_TAG_HVAR: table = new OpenTypeHVAR(this, tag); break; + case OTS_TAG_KERN: table = new OpenTypeKERN(this, tag); break; + case OTS_TAG_LOCA: table = new OpenTypeLOCA(this, tag); break; + case OTS_TAG_LTSH: table = new OpenTypeLTSH(this, tag); break; + case OTS_TAG_MATH: table = new OpenTypeMATH(this, tag); break; + case OTS_TAG_MAXP: table = new OpenTypeMAXP(this, tag); break; + case OTS_TAG_MVAR: table = new OpenTypeMVAR(this, tag); break; + case OTS_TAG_NAME: table = new OpenTypeNAME(this, tag); break; + case OTS_TAG_OS2: table = new OpenTypeOS2(this, tag); break; + case OTS_TAG_POST: table = new OpenTypePOST(this, tag); break; + case OTS_TAG_PREP: table = new OpenTypePREP(this, tag); break; + case OTS_TAG_STAT: table = new OpenTypeSTAT(this, tag); break; + case OTS_TAG_VDMX: table = new OpenTypeVDMX(this, tag); break; + case OTS_TAG_VHEA: table = new OpenTypeVHEA(this, tag); break; + case OTS_TAG_VMTX: table = new OpenTypeVMTX(this, tag); break; + case OTS_TAG_VORG: table = new OpenTypeVORG(this, tag); break; + case OTS_TAG_VVAR: table = new OpenTypeVVAR(this, tag); break; + // Graphite tables +#ifdef OTS_GRAPHITE + case OTS_TAG_FEAT: table = new OpenTypeFEAT(this, tag); break; + case OTS_TAG_GLAT: table = new OpenTypeGLAT(this, tag); break; + case OTS_TAG_GLOC: table = new OpenTypeGLOC(this, tag); break; + case OTS_TAG_SILE: table = new OpenTypeSILE(this, tag); break; + case OTS_TAG_SILF: table = new OpenTypeSILF(this, tag); break; + case OTS_TAG_SILL: table = new OpenTypeSILL(this, tag); break; +#endif + default: break; + } + } + + if (table) { + const uint8_t* table_data; + size_t table_length; + + ret = GetTableData(data, table_entry, arena, &table_length, &table_data); + if (ret) { + ret = table->Parse(table_data, table_length); + if (ret) + AddTable(table_entry, table); + } + } + + if (!ret) + delete table; + + return ret; +} + +Table* Font::GetTable(uint32_t tag) const { + const auto &it = m_tables.find(tag); + if (it != m_tables.end() && it->second && it->second->ShouldSerialize()) + return it->second; + return NULL; +} + +Table* Font::GetTypedTable(uint32_t tag) const { + Table* t = GetTable(tag); + if (t && t->Type() == tag) + return t; + return NULL; +} + +void Font::AddTable(TableEntry entry, Table* table) { + // Attempting to add a duplicate table would be an error; this should only + // be used to add a table that does not already exist. + assert(m_tables.find(table->Tag()) == m_tables.end()); + m_tables[table->Tag()] = table; + file->tables[entry] = table; +} + +void Font::DropGraphite() { + file->context->Message(0, "Dropping all Graphite tables"); + for (const std::pair entry : m_tables) { + if (IsGraphiteTag(entry.first)) { + entry.second->Drop("Discarding Graphite table"); + } + } +} + +void Font::DropVariations() { + file->context->Message(0, "Dropping all Variation tables"); + for (const std::pair entry : m_tables) { + if (IsVariationsTag(entry.first)) { + entry.second->Drop("Discarding Variations table"); + } + } +} + +bool Table::ShouldSerialize() { + return m_shouldSerialize; +} + +void Table::Message(int level, const char *format, va_list va) { + char msg[206] = { OTS_UNTAG(m_tag), ':', ' ' }; + std::vsnprintf(msg + 6, 200, format, va); + m_font->file->context->Message(level, msg); +} + +bool Table::Error(const char *format, ...) { + va_list va; + va_start(va, format); + Message(0, format, va); + va_end(va); + + return false; +} + +bool Table::Warning(const char *format, ...) { + va_list va; + va_start(va, format); + Message(1, format, va); + va_end(va); + + return true; +} + +bool Table::Drop(const char *format, ...) { + m_shouldSerialize = false; + + va_list va; + va_start(va, format); + Message(0, format, va); + m_font->file->context->Message(0, "Table discarded"); + va_end(va); + + return true; +} + +bool Table::DropGraphite(const char *format, ...) { + va_list va; + va_start(va, format); + Message(0, format, va); + va_end(va); + + m_font->DropGraphite(); + if (IsGraphiteTag(m_tag)) + Drop("Discarding Graphite table"); + + return true; +} + +bool Table::DropVariations(const char *format, ...) { + va_list va; + va_start(va, format); + Message(0, format, va); + va_end(va); + + m_font->DropVariations(); + if (IsVariationsTag(m_tag)) + Drop("Discarding Variations table"); + + return true; +} + +bool TablePassthru::Parse(const uint8_t *data, size_t length) { + m_data = data; + m_length = length; + return true; +} + +bool TablePassthru::Serialize(OTSStream *out) { + if (!out->Write(m_data, m_length)) { + return Error("Failed to write table"); + } + + return true; +} + +bool OTSContext::Process(OTSStream *output, + const uint8_t *data, + size_t length, + uint32_t index) { + FontFile header; + Font font(&header); + header.context = this; + + if (length < 4) { + return OTS_FAILURE_MSG_(&header, "file less than 4 bytes"); + } + + bool result; + if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == 'F') { + result = ProcessWOFF(&header, &font, output, data, length); + } else if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == '2') { + result = ProcessWOFF2(&header, output, data, length, index); + } else if (data[0] == 't' && data[1] == 't' && data[2] == 'c' && data[3] == 'f') { + result = ProcessTTC(&header, output, data, length, index); + } else { + result = ProcessTTF(&header, &font, output, data, length); + } + + return result; +} + +} // namespace ots -- cgit v1.2.3