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Unified Diff: third_party/ots/src/ots.cc

Issue 797183002: Revert of Updating OTS repo from https://github.com/khaledhosny/ots.git (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years ago
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Index: third_party/ots/src/ots.cc
diff --git a/third_party/ots/src/ots.cc b/third_party/ots/src/ots.cc
deleted file mode 100644
index 197c649816528cc5a5b9a48485219aa6d424b36e..0000000000000000000000000000000000000000
--- a/third_party/ots/src/ots.cc
+++ /dev/null
@@ -1,824 +0,0 @@
-// Copyright (c) 2009 The Chromium 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 <sys/types.h>
-#include <zlib.h>
-
-#include <algorithm>
-#include <cstdlib>
-#include <cstring>
-#include <limits>
-#include <map>
-#include <vector>
-
-#include "woff2.h"
-
-// The OpenType Font File
-// http://www.microsoft.com/typography/otspec/cmap.htm
-
-namespace {
-
-// Generate a message with or without a table tag, when 'header' is the OpenTypeFile pointer
-#define OTS_FAILURE_MSG_TAG(msg_,tag_) OTS_FAILURE_MSG_TAG_(header, msg_, tag_)
-#define OTS_FAILURE_MSG_HDR(msg_) OTS_FAILURE_MSG_(header, msg_)
-
-
-struct OpenTypeTable {
- uint32_t tag;
- uint32_t chksum;
- uint32_t offset;
- uint32_t length;
- uint32_t uncompressed_length;
-};
-
-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;
-}
-
-uint32_t Tag(const char *tag_str) {
- uint32_t ret;
- std::memcpy(&ret, tag_str, 4);
- return ret;
-}
-
-struct OutputTable {
- uint32_t tag;
- size_t offset;
- size_t length;
- uint32_t chksum;
-
- static bool SortByTag(const OutputTable& a, const OutputTable& b) {
- const uint32_t atag = ntohl(a.tag);
- const uint32_t btag = ntohl(b.tag);
- return atag < btag;
- }
-};
-
-struct Arena {
- public:
- ~Arena() {
- for (std::vector<uint8_t*>::iterator
- i = hunks_.begin(); i != hunks_.end(); ++i) {
- delete[] *i;
- }
- }
-
- uint8_t* Allocate(size_t length) {
- uint8_t* p = new uint8_t[length];
- hunks_.push_back(p);
- return p;
- }
-
- private:
- std::vector<uint8_t*> hunks_;
-};
-
-const struct {
- const char* tag;
- bool (*parse)(ots::OpenTypeFile *otf, const uint8_t *data, size_t length);
- bool (*serialise)(ots::OTSStream *out, ots::OpenTypeFile *file);
- bool (*should_serialise)(ots::OpenTypeFile *file);
- void (*free)(ots::OpenTypeFile *file);
- bool required;
-} table_parsers[] = {
- { "maxp", ots::ots_maxp_parse, ots::ots_maxp_serialise,
- ots::ots_maxp_should_serialise, ots::ots_maxp_free, true },
- { "head", ots::ots_head_parse, ots::ots_head_serialise,
- ots::ots_head_should_serialise, ots::ots_head_free, true },
- { "OS/2", ots::ots_os2_parse, ots::ots_os2_serialise,
- ots::ots_os2_should_serialise, ots::ots_os2_free, true },
- { "cmap", ots::ots_cmap_parse, ots::ots_cmap_serialise,
- ots::ots_cmap_should_serialise, ots::ots_cmap_free, true },
- { "hhea", ots::ots_hhea_parse, ots::ots_hhea_serialise,
- ots::ots_hhea_should_serialise, ots::ots_hhea_free, true },
- { "hmtx", ots::ots_hmtx_parse, ots::ots_hmtx_serialise,
- ots::ots_hmtx_should_serialise, ots::ots_hmtx_free, true },
- { "name", ots::ots_name_parse, ots::ots_name_serialise,
- ots::ots_name_should_serialise, ots::ots_name_free, true },
- { "post", ots::ots_post_parse, ots::ots_post_serialise,
- ots::ots_post_should_serialise, ots::ots_post_free, true },
- { "loca", ots::ots_loca_parse, ots::ots_loca_serialise,
- ots::ots_loca_should_serialise, ots::ots_loca_free, false },
- { "glyf", ots::ots_glyf_parse, ots::ots_glyf_serialise,
- ots::ots_glyf_should_serialise, ots::ots_glyf_free, false },
- { "CFF ", ots::ots_cff_parse, ots::ots_cff_serialise,
- ots::ots_cff_should_serialise, ots::ots_cff_free, false },
- { "VDMX", ots::ots_vdmx_parse, ots::ots_vdmx_serialise,
- ots::ots_vdmx_should_serialise, ots::ots_vdmx_free, false },
- { "hdmx", ots::ots_hdmx_parse, ots::ots_hdmx_serialise,
- ots::ots_hdmx_should_serialise, ots::ots_hdmx_free, false },
- { "gasp", ots::ots_gasp_parse, ots::ots_gasp_serialise,
- ots::ots_gasp_should_serialise, ots::ots_gasp_free, false },
- { "cvt ", ots::ots_cvt_parse, ots::ots_cvt_serialise,
- ots::ots_cvt_should_serialise, ots::ots_cvt_free, false },
- { "fpgm", ots::ots_fpgm_parse, ots::ots_fpgm_serialise,
- ots::ots_fpgm_should_serialise, ots::ots_fpgm_free, false },
- { "prep", ots::ots_prep_parse, ots::ots_prep_serialise,
- ots::ots_prep_should_serialise, ots::ots_prep_free, false },
- { "LTSH", ots::ots_ltsh_parse, ots::ots_ltsh_serialise,
- ots::ots_ltsh_should_serialise, ots::ots_ltsh_free, false },
- { "VORG", ots::ots_vorg_parse, ots::ots_vorg_serialise,
- ots::ots_vorg_should_serialise, ots::ots_vorg_free, false },
- { "kern", ots::ots_kern_parse, ots::ots_kern_serialise,
- ots::ots_kern_should_serialise, ots::ots_kern_free, false },
- // We need to parse GDEF table in advance of parsing GSUB/GPOS tables
- // because they could refer GDEF table.
- { "GDEF", ots::ots_gdef_parse, ots::ots_gdef_serialise,
- ots::ots_gdef_should_serialise, ots::ots_gdef_free, false },
- { "GPOS", ots::ots_gpos_parse, ots::ots_gpos_serialise,
- ots::ots_gpos_should_serialise, ots::ots_gpos_free, false },
- { "GSUB", ots::ots_gsub_parse, ots::ots_gsub_serialise,
- ots::ots_gsub_should_serialise, ots::ots_gsub_free, false },
- { "vhea", ots::ots_vhea_parse, ots::ots_vhea_serialise,
- ots::ots_vhea_should_serialise, ots::ots_vhea_free, false },
- { "vmtx", ots::ots_vmtx_parse, ots::ots_vmtx_serialise,
- ots::ots_vmtx_should_serialise, ots::ots_vmtx_free, false },
- { "MATH", ots::ots_math_parse, ots::ots_math_serialise,
- ots::ots_math_should_serialise, ots::ots_math_free, false },
- // TODO(bashi): Support mort, base, and jstf tables.
- { 0, NULL, NULL, NULL, NULL, false },
-};
-
-bool ProcessGeneric(ots::OpenTypeFile *header,
- uint32_t signature,
- ots::OTSStream *output,
- const uint8_t *data, size_t length,
- const std::vector<OpenTypeTable>& tables,
- ots::Buffer& file);
-
-bool ProcessTTF(ots::OpenTypeFile *header,
- 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");
- }
-
- if (!file.ReadTag(&header->version)) {
- return OTS_FAILURE_MSG_HDR("error reading version tag");
- }
- if (!ots::IsValidVersionTag(header->version)) {
- return OTS_FAILURE_MSG_HDR("invalid version tag");
- }
-
- if (!file.ReadU16(&header->num_tables) ||
- !file.ReadU16(&header->search_range) ||
- !file.ReadU16(&header->entry_selector) ||
- !file.ReadU16(&header->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 (header->num_tables >= 4096 || header->num_tables < 1) {
- return OTS_FAILURE_MSG_HDR("excessive (or zero) number of tables");
- }
-
- unsigned max_pow2 = 0;
- while (1u << (max_pow2 + 1) <= header->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 (header->search_range != expected_search_range) {
- OTS_FAILURE_MSG_HDR("bad search range");
- header->search_range = expected_search_range; // Fix the value.
- }
-
- // entry_selector is Log2(maximum power of 2 <= numTables)
- if (header->entry_selector != max_pow2) {
- return OTS_FAILURE_MSG_HDR("incorrect entrySelector for table directory");
- }
-
- // 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 > header->search_range by construction of search_range.
- const uint16_t expected_range_shift =
- 16 * header->num_tables - header->search_range;
- if (header->range_shift != expected_range_shift) {
- OTS_FAILURE_MSG_HDR("bad range shift");
- header->range_shift = expected_range_shift; // the same as above.
- }
-
- // Next up is the list of tables.
- std::vector<OpenTypeTable> tables;
-
- for (unsigned i = 0; i < header->num_tables; ++i) {
- OpenTypeTable table;
- if (!file.ReadTag(&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, header->version, output, data, length,
- tables, file);
-}
-
-bool ProcessWOFF(ots::OpenTypeFile *header,
- 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.ReadTag(&woff_tag)) {
- return OTS_FAILURE_MSG_HDR("error reading WOFF marker");
- }
-
- if (woff_tag != Tag("wOFF")) {
- return OTS_FAILURE_MSG_HDR("invalid WOFF marker");
- }
-
- if (!file.ReadTag(&header->version)) {
- return OTS_FAILURE_MSG_HDR("error reading version tag");
- }
- if (!ots::IsValidVersionTag(header->version)) {
- return OTS_FAILURE_MSG_HDR("invalid version tag");
- }
-
- header->search_range = 0;
- header->entry_selector = 0;
- header->range_shift = 0;
-
- 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(&header->num_tables) || !header->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("error skipping WOFF header fields");
- }
-
- // 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("error reading WOFF header fields");
- }
- if (meta_offset) {
- if (meta_offset >= length || length - meta_offset < meta_length) {
- return OTS_FAILURE_MSG_HDR("invalid metadata block location/size");
- }
- }
-
- // 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("error reading WOFF header fields");
- }
- if (priv_offset) {
- if (priv_offset >= length || length - priv_offset < priv_length) {
- return OTS_FAILURE_MSG_HDR("invalid private block location/size");
- }
- }
-
- // Next up is the list of tables.
- std::vector<OpenTypeTable> 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 * header->num_tables;
- for (unsigned i = 0; i < header->num_tables; ++i) {
- OpenTypeTable table;
- if (!file.ReadTag(&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<uint32_t>::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<uint64_t>(tables[last_index].offset) +
- static_cast<uint64_t>(tables[last_index].length));
- if (block_end > std::numeric_limits<uint32_t>::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 location");
- }
- block_end = ots::Round4(static_cast<uint64_t>(meta_offset) +
- static_cast<uint64_t>(meta_length));
- if (block_end > std::numeric_limits<uint32_t>::max()) {
- return OTS_FAILURE_MSG_HDR("invalid metadata block size");
- }
- }
- if (priv_offset) {
- if (block_end != priv_offset) {
- return OTS_FAILURE_MSG_HDR("invalid private block location");
- }
- block_end = ots::Round4(static_cast<uint64_t>(priv_offset) +
- static_cast<uint64_t>(priv_length));
- if (block_end > std::numeric_limits<uint32_t>::max()) {
- return OTS_FAILURE_MSG_HDR("invalid private block size");
- }
- }
- if (block_end != ots::Round4(length)) {
- return OTS_FAILURE_MSG_HDR("file length mismatch (trailing junk?)");
- }
-
- return ProcessGeneric(header, woff_tag, output, data, length, tables, file);
-}
-
-bool ProcessWOFF2(ots::OpenTypeFile *header,
- ots::OTSStream *output, const uint8_t *data, size_t length) {
- size_t decompressed_size = ots::ComputeWOFF2FinalSize(data, length);
- if (decompressed_size == 0) {
- return OTS_FAILURE();
- }
- // decompressed font must be <= 30MB
- if (decompressed_size > 30 * 1024 * 1024) {
- return OTS_FAILURE();
- }
-
- std::vector<uint8_t> decompressed_buffer(decompressed_size);
- if (!ots::ConvertWOFF2ToTTF(header, &decompressed_buffer[0], decompressed_size,
- data, length)) {
- return OTS_FAILURE();
- }
- return ProcessTTF(header, output, &decompressed_buffer[0], decompressed_size);
-}
-
-ots::TableAction GetTableAction(ots::OpenTypeFile *header, uint32_t tag) {
- ots::TableAction action = ots::TABLE_ACTION_DEFAULT;
-
- action = header->context->GetTableAction(htonl(tag));
-
- if (action == ots::TABLE_ACTION_DEFAULT) {
- action = ots::TABLE_ACTION_DROP;
-
- for (unsigned i = 0; ; ++i) {
- if (table_parsers[i].parse == NULL) break;
-
- if (Tag(table_parsers[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 OpenTypeTable table,
- 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::OpenTypeFile *header, uint32_t signature,
- ots::OTSStream *output,
- const uint8_t *data, size_t length,
- const std::vector<OpenTypeTable>& tables,
- ots::Buffer& file) {
- const size_t data_offset = file.offset();
-
- uint32_t uncompressed_sum = 0;
-
- for (unsigned i = 0; i < header->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 = ntohl(tables[i].tag);
- const uint32_t prev_tag = ntohl(tables[i - 1].tag);
- if (this_tag <= prev_tag) {
- return OTS_FAILURE_MSG_HDR("table directory not correctly ordered");
- }
- }
-
- // all tag names must be built from printable ASCII characters
- if (!CheckTag(tables[i].tag)) {
- return OTS_FAILURE_MSG_TAG("invalid table tag", &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 uncompress to > 30 MB
- if (tables[i].uncompressed_length > 30 * 1024 * 1024) {
- return OTS_FAILURE_MSG_TAG("uncompressed length exceeds 30MB", &tables[i].tag);
- }
- if (uncompressed_sum + tables[i].uncompressed_length < uncompressed_sum) {
- return OTS_FAILURE_MSG_TAG("overflow of uncompressed 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 == Tag("wOFF")) {
- 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 uncompressed must be <= 30MB.
- if (uncompressed_sum > 30 * 1024 * 1024) {
- return OTS_FAILURE_MSG_HDR("uncompressed sum exceeds 30MB");
- }
-
- std::map<uint32_t, OpenTypeTable> table_map;
- for (unsigned i = 0; i < header->num_tables; ++i) {
- table_map[tables[i].tag] = tables[i];
- }
-
- // check that the tables are not overlapping.
- std::vector<std::pair<uint32_t, uint8_t> > overlap_checker;
- for (unsigned i = 0; i < header->num_tables; ++i) {
- overlap_checker.push_back(
- std::make_pair(tables[i].offset, static_cast<uint8_t>(1) /* start */));
- overlap_checker.push_back(
- std::make_pair(tables[i].offset + tables[i].length,
- static_cast<uint8_t>(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");
- }
- }
-
- Arena arena;
-
- for (unsigned i = 0; ; ++i) {
- if (table_parsers[i].parse == NULL) break;
-
- uint32_t tag = Tag(table_parsers[i].tag);
- const std::map<uint32_t, OpenTypeTable>::const_iterator it = table_map.find(tag);
-
- ots::TableAction action = GetTableAction(header, tag);
- if (it == table_map.end()) {
- if (table_parsers[i].required && action == ots::TABLE_ACTION_SANITIZE) {
- return OTS_FAILURE_MSG_TAG("missing required table", table_parsers[i].tag);
- }
- continue;
- }
-
- const uint8_t* table_data;
- size_t table_length;
-
- if (!GetTableData(data, it->second, &arena, &table_length, &table_data)) {
- return OTS_FAILURE_MSG_TAG("uncompress failed", table_parsers[i].tag);
- }
-
- if (action == ots::TABLE_ACTION_SANITIZE &&
- !table_parsers[i].parse(header, table_data, table_length)) {
- // TODO: parsers should generate specific messages detailing the failure;
- // once those are all added, we won't need a generic failure message here
- return OTS_FAILURE_MSG_TAG("failed to parse table", table_parsers[i].tag);
- }
- }
-
- if (header->cff) {
- // font with PostScript glyph
- if (header->version != Tag("OTTO")) {
- return OTS_FAILURE_MSG_HDR("wrong font version for PostScript glyph data");
- }
- if (header->glyf || header->loca) {
- // mixing outline formats is not recommended
- return OTS_FAILURE_MSG_HDR("font contains both PS and TT glyphs");
- }
- } else {
- if (!header->glyf || !header->loca) {
- // No TrueType glyph found.
- // Note: bitmap-only fonts are not supported.
- return OTS_FAILURE_MSG_HDR("neither PS nor TT glyphs present");
- }
- }
-
- uint16_t num_output_tables = 0;
- for (unsigned i = 0; ; ++i) {
- if (table_parsers[i].parse == NULL) {
- break;
- }
-
- if (table_parsers[i].should_serialise(header)) {
- num_output_tables++;
- }
- }
-
- for (std::map<uint32_t, OpenTypeTable>::const_iterator it = table_map.begin();
- it != table_map.end(); ++it) {
- ots::TableAction action = GetTableAction(header, it->first);
- if (action == ots::TABLE_ACTION_PASSTHRU) {
- 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->WriteTag(header->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<OutputTable> out_tables;
-
- size_t head_table_offset = 0;
- for (unsigned i = 0; ; ++i) {
- if (table_parsers[i].parse == NULL) {
- break;
- }
-
- if (!table_parsers[i].should_serialise(header)) {
- continue;
- }
-
- OutputTable out;
- uint32_t tag = Tag(table_parsers[i].tag);
- out.tag = tag;
- out.offset = output->Tell();
-
- output->ResetChecksum();
- if (tag == Tag("head")) {
- head_table_offset = out.offset;
- }
- if (!table_parsers[i].serialise(output, header)) {
- return OTS_FAILURE_MSG_TAG("failed to serialize table", table_parsers[i].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_HDR("error writing output");
- }
- out.length = end_offset - out.offset;
-
- // align tables to four bytes
- if (!output->Pad((4 - (end_offset & 3)) % 4)) {
- return OTS_FAILURE_MSG_HDR("error writing output");
- }
- out.chksum = output->chksum();
- out_tables.push_back(out);
- }
-
- for (std::map<uint32_t, OpenTypeTable>::const_iterator it = table_map.begin();
- it != table_map.end(); ++it) {
- ots::TableAction action = GetTableAction(header, it->first);
- if (action == ots::TABLE_ACTION_PASSTHRU) {
- OutputTable out;
- out.tag = it->second.tag;
- out.offset = output->Tell();
-
- output->ResetChecksum();
- if (it->second.tag == Tag("head")) {
- head_table_offset = out.offset;
- }
-
- const uint8_t* table_data;
- size_t table_length;
-
- if (!GetTableData(data, it->second, &arena, &table_length, &table_data)) {
- return OTS_FAILURE_MSG_HDR("Failed to uncompress table");
- }
-
- if (!output->Write(table_data, table_length)) {
- return OTS_FAILURE_MSG_HDR("Failed to serialize table");
- }
-
- 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_HDR("error writing output");
- }
- out.length = end_offset - out.offset;
-
- // align tables to four bytes
- if (!output->Pad((4 - (end_offset & 3)) % 4)) {
- return OTS_FAILURE_MSG_HDR("error writing output");
- }
- out.chksum = output->chksum();
- out_tables.push_back(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(), OutputTable::SortByTag);
- 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->WriteTag(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<uint32_t>(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;
-}
-
-} // namespace
-
-namespace ots {
-
-void EnableWOFF2() {
-}
-
-bool IsValidVersionTag(uint32_t tag) {
- return tag == Tag("\x00\x01\x00\x00") ||
- // OpenType fonts with CFF data have 'OTTO' tag.
- tag == Tag("OTTO") ||
- // Older Mac fonts might have 'true' or 'typ1' tag.
- tag == Tag("true") ||
- tag == Tag("typ1");
-}
-
-bool OTSContext::Process(OTSStream *output,
- const uint8_t *data,
- size_t length) {
- OpenTypeFile 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, output, data, length);
- } else if (data[0] == 'w' && data[1] == 'O' && data[2] == 'F' && data[3] == '2') {
- result = ProcessWOFF2(&header, output, data, length);
- } else {
- result = ProcessTTF(&header, output, data, length);
- }
-
- for (unsigned i = 0; ; ++i) {
- if (table_parsers[i].parse == NULL) break;
- table_parsers[i].free(&header);
- }
- return result;
-}
-
-// For backward compatibility
-bool Process(OTSStream *output, const uint8_t *data, size_t length) {
- static OTSContext context;
- return context.Process(output, data, length);
-}
-
-} // namespace ots
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