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Unified Diff: third_party/ots/src/gsub.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/gsub.cc
diff --git a/third_party/ots/src/gsub.cc b/third_party/ots/src/gsub.cc
deleted file mode 100644
index af31144635f6ae9596881833097b17b9d44f99fe..0000000000000000000000000000000000000000
--- a/third_party/ots/src/gsub.cc
+++ /dev/null
@@ -1,685 +0,0 @@
-// Copyright (c) 2011 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 "gsub.h"
-
-#include <limits>
-#include <vector>
-
-#include "layout.h"
-#include "maxp.h"
-
-// GSUB - The Glyph Substitution Table
-// http://www.microsoft.com/typography/otspec/gsub.htm
-
-#define TABLE_NAME "GSUB"
-
-namespace {
-
-// The GSUB header size
-const size_t kGsubHeaderSize = 4 + 3 * 2;
-
-enum GSUB_TYPE {
- GSUB_TYPE_SINGLE = 1,
- GSUB_TYPE_MULTIPLE = 2,
- GSUB_TYPE_ALTERNATE = 3,
- GSUB_TYPE_LIGATURE = 4,
- GSUB_TYPE_CONTEXT = 5,
- GSUB_TYPE_CHANGING_CONTEXT = 6,
- GSUB_TYPE_EXTENSION_SUBSTITUTION = 7,
- GSUB_TYPE_REVERSE_CHAINING_CONTEXT_SINGLE = 8,
- GSUB_TYPE_RESERVED = 9
-};
-
-// Lookup type parsers.
-bool ParseSingleSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseMutipleSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseAlternateSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseLigatureSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseContextSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseChainingContextSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data,
- const size_t length);
-bool ParseExtensionSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseReverseChainingContextSingleSubstitution(
- const ots::OpenTypeFile *file, const uint8_t *data, const size_t length);
-
-const ots::LookupSubtableParser::TypeParser kGsubTypeParsers[] = {
- {GSUB_TYPE_SINGLE, ParseSingleSubstitution},
- {GSUB_TYPE_MULTIPLE, ParseMutipleSubstitution},
- {GSUB_TYPE_ALTERNATE, ParseAlternateSubstitution},
- {GSUB_TYPE_LIGATURE, ParseLigatureSubstitution},
- {GSUB_TYPE_CONTEXT, ParseContextSubstitution},
- {GSUB_TYPE_CHANGING_CONTEXT, ParseChainingContextSubstitution},
- {GSUB_TYPE_EXTENSION_SUBSTITUTION, ParseExtensionSubstitution},
- {GSUB_TYPE_REVERSE_CHAINING_CONTEXT_SINGLE,
- ParseReverseChainingContextSingleSubstitution}
-};
-
-const ots::LookupSubtableParser kGsubLookupSubtableParser = {
- arraysize(kGsubTypeParsers),
- GSUB_TYPE_EXTENSION_SUBSTITUTION, kGsubTypeParsers
-};
-
-// Lookup Type 1:
-// Single Substitution Subtable
-bool ParseSingleSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- ots::Buffer subtable(data, length);
-
- uint16_t format = 0;
- uint16_t offset_coverage = 0;
-
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage)) {
- return OTS_FAILURE_MSG("Failed to read single subst table header");
- }
-
- const uint16_t num_glyphs = file->maxp->num_glyphs;
- if (format == 1) {
- // Parse SingleSubstFormat1
- int16_t delta_glyph_id = 0;
- if (!subtable.ReadS16(&delta_glyph_id)) {
- return OTS_FAILURE_MSG("Failed to read glyph shift from format 1 single subst table");
- }
- if (std::abs(delta_glyph_id) >= num_glyphs) {
- return OTS_FAILURE_MSG("bad glyph shift of %d in format 1 single subst table", delta_glyph_id);
- }
- } else if (format == 2) {
- // Parse SingleSubstFormat2
- uint16_t glyph_count = 0;
- if (!subtable.ReadU16(&glyph_count)) {
- return OTS_FAILURE_MSG("Failed to read glyph cound in format 2 single subst table");
- }
- if (glyph_count > num_glyphs) {
- return OTS_FAILURE_MSG("Bad glyph count %d > %d in format 2 single subst table", glyph_count, num_glyphs);
- }
- for (unsigned i = 0; i < glyph_count; ++i) {
- uint16_t substitute = 0;
- if (!subtable.ReadU16(&substitute)) {
- return OTS_FAILURE_MSG("Failed to read substitution %d in format 2 single subst table", i);
- }
- if (substitute >= num_glyphs) {
- return OTS_FAILURE_MSG("too large substitute: %u", substitute);
- }
- }
- } else {
- return OTS_FAILURE_MSG("Bad single subst table format %d", format);
- }
-
- if (offset_coverage < subtable.offset() || offset_coverage >= length) {
- return OTS_FAILURE_MSG("Bad coverage offset %x", offset_coverage);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage,
- length - offset_coverage, num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table");
- }
-
- return true;
-}
-
-bool ParseSequenceTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t num_glyphs) {
- ots::Buffer subtable(data, length);
-
- uint16_t glyph_count = 0;
- if (!subtable.ReadU16(&glyph_count)) {
- return OTS_FAILURE_MSG("Failed to read glyph count in sequence table");
- }
- if (glyph_count > num_glyphs) {
- return OTS_FAILURE_MSG("bad glyph count %d > %d", glyph_count, num_glyphs);
- }
- for (unsigned i = 0; i < glyph_count; ++i) {
- uint16_t substitute = 0;
- if (!subtable.ReadU16(&substitute)) {
- return OTS_FAILURE_MSG("Failedt o read substitution %d in sequence table", i);
- }
- if (substitute >= num_glyphs) {
- return OTS_FAILURE_MSG("Bad subsitution (%d) %d > %d", i, substitute, num_glyphs);
- }
- }
-
- return true;
-}
-
-// Lookup Type 2:
-// Multiple Substitution Subtable
-bool ParseMutipleSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- ots::Buffer subtable(data, length);
-
- uint16_t format = 0;
- uint16_t offset_coverage = 0;
- uint16_t sequence_count = 0;
-
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage) ||
- !subtable.ReadU16(&sequence_count)) {
- return OTS_FAILURE_MSG("Can't read header of multiple subst table");
- }
-
- if (format != 1) {
- return OTS_FAILURE_MSG("Bad multiple subst table format %d", format);
- }
-
- const uint16_t num_glyphs = file->maxp->num_glyphs;
- const unsigned sequence_end = static_cast<unsigned>(6) +
- sequence_count * 2;
- if (sequence_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad segence end %d, in multiple subst", sequence_end);
- }
- for (unsigned i = 0; i < sequence_count; ++i) {
- uint16_t offset_sequence = 0;
- if (!subtable.ReadU16(&offset_sequence)) {
- return OTS_FAILURE_MSG("Failed to read sequence offset for sequence %d", i);
- }
- if (offset_sequence < sequence_end || offset_sequence >= length) {
- return OTS_FAILURE_MSG("Bad sequence offset %d for sequence %d", offset_sequence, i);
- }
- if (!ParseSequenceTable(file, data + offset_sequence, length - offset_sequence,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse sequence table %d", i);
- }
- }
-
- if (offset_coverage < sequence_end || offset_coverage >= length) {
- return OTS_FAILURE_MSG("Bad coverage offset %d", offset_coverage);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage,
- length - offset_coverage, num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table");
- }
-
- return true;
-}
-
-bool ParseAlternateSetTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t num_glyphs) {
- ots::Buffer subtable(data, length);
-
- uint16_t glyph_count = 0;
- if (!subtable.ReadU16(&glyph_count)) {
- return OTS_FAILURE_MSG("Failed to read alternate set header");
- }
- if (glyph_count > num_glyphs) {
- return OTS_FAILURE_MSG("Bad glyph count %d > %d in alternate set table", glyph_count, num_glyphs);
- }
- for (unsigned i = 0; i < glyph_count; ++i) {
- uint16_t alternate = 0;
- if (!subtable.ReadU16(&alternate)) {
- return OTS_FAILURE_MSG("Can't read alternate %d", i);
- }
- if (alternate >= num_glyphs) {
- return OTS_FAILURE_MSG("Too large alternate: %u", alternate);
- }
- }
- return true;
-}
-
-// Lookup Type 3:
-// Alternate Substitution Subtable
-bool ParseAlternateSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- ots::Buffer subtable(data, length);
-
- uint16_t format = 0;
- uint16_t offset_coverage = 0;
- uint16_t alternate_set_count = 0;
-
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage) ||
- !subtable.ReadU16(&alternate_set_count)) {
- return OTS_FAILURE_MSG("Can't read alternate subst header");
- }
-
- if (format != 1) {
- return OTS_FAILURE_MSG("Bad alternate subst table format %d", format);
- }
-
- const uint16_t num_glyphs = file->maxp->num_glyphs;
- const unsigned alternate_set_end = static_cast<unsigned>(6) +
- alternate_set_count * 2;
- if (alternate_set_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad end of alternate set %d", alternate_set_end);
- }
- for (unsigned i = 0; i < alternate_set_count; ++i) {
- uint16_t offset_alternate_set = 0;
- if (!subtable.ReadU16(&offset_alternate_set)) {
- return OTS_FAILURE_MSG("Can't read alternate set offset for set %d", i);
- }
- if (offset_alternate_set < alternate_set_end ||
- offset_alternate_set >= length) {
- return OTS_FAILURE_MSG("Bad alternate set offset %d for set %d", offset_alternate_set, i);
- }
- if (!ParseAlternateSetTable(file, data + offset_alternate_set,
- length - offset_alternate_set,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse alternate set");
- }
- }
-
- if (offset_coverage < alternate_set_end || offset_coverage >= length) {
- return OTS_FAILURE_MSG("Bad coverage offset %d", offset_coverage);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage,
- length - offset_coverage, num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table");
- }
-
- return true;
-}
-
-bool ParseLigatureTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t num_glyphs) {
- ots::Buffer subtable(data, length);
-
- uint16_t lig_glyph = 0;
- uint16_t comp_count = 0;
-
- if (!subtable.ReadU16(&lig_glyph) ||
- !subtable.ReadU16(&comp_count)) {
- return OTS_FAILURE_MSG("Failed to read ligatuer table header");
- }
-
- if (lig_glyph >= num_glyphs) {
- return OTS_FAILURE_MSG("too large lig_glyph: %u", lig_glyph);
- }
- if (comp_count == 0 || comp_count > num_glyphs) {
- return OTS_FAILURE_MSG("Bad component count of %d", comp_count);
- }
- for (unsigned i = 0; i < comp_count - static_cast<unsigned>(1); ++i) {
- uint16_t component = 0;
- if (!subtable.ReadU16(&component)) {
- return OTS_FAILURE_MSG("Can't read ligature component %d", i);
- }
- if (component >= num_glyphs) {
- return OTS_FAILURE_MSG("Bad ligature component %d of %d", i, component);
- }
- }
-
- return true;
-}
-
-bool ParseLigatureSetTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t num_glyphs) {
- ots::Buffer subtable(data, length);
-
- uint16_t ligature_count = 0;
-
- if (!subtable.ReadU16(&ligature_count)) {
- return OTS_FAILURE_MSG("Can't read ligature count in ligature set");
- }
-
- const unsigned ligature_end = static_cast<unsigned>(2) + ligature_count * 2;
- if (ligature_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad end of ligature %d in ligature set", ligature_end);
- }
- for (unsigned i = 0; i < ligature_count; ++i) {
- uint16_t offset_ligature = 0;
- if (!subtable.ReadU16(&offset_ligature)) {
- return OTS_FAILURE_MSG("Failed to read ligature offset %d", i);
- }
- if (offset_ligature < ligature_end || offset_ligature >= length) {
- return OTS_FAILURE_MSG("Bad ligature offset %d for ligature %d", offset_ligature, i);
- }
- if (!ParseLigatureTable(file, data + offset_ligature, length - offset_ligature,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse ligature %d", i);
- }
- }
-
- return true;
-}
-
-// Lookup Type 4:
-// Ligature Substitution Subtable
-bool ParseLigatureSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- ots::Buffer subtable(data, length);
-
- uint16_t format = 0;
- uint16_t offset_coverage = 0;
- uint16_t lig_set_count = 0;
-
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage) ||
- !subtable.ReadU16(&lig_set_count)) {
- return OTS_FAILURE_MSG("Failed to read ligature substitution header");
- }
-
- if (format != 1) {
- return OTS_FAILURE_MSG("Bad ligature substitution table format %d", format);
- }
-
- const uint16_t num_glyphs = file->maxp->num_glyphs;
- const unsigned ligature_set_end = static_cast<unsigned>(6) +
- lig_set_count * 2;
- if (ligature_set_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad end of ligature set %d in ligature substitution table", ligature_set_end);
- }
- for (unsigned i = 0; i < lig_set_count; ++i) {
- uint16_t offset_ligature_set = 0;
- if (!subtable.ReadU16(&offset_ligature_set)) {
- return OTS_FAILURE_MSG("Can't read ligature set offset %d", i);
- }
- if (offset_ligature_set < ligature_set_end ||
- offset_ligature_set >= length) {
- return OTS_FAILURE_MSG("Bad ligature set offset %d for set %d", offset_ligature_set, i);
- }
- if (!ParseLigatureSetTable(file, data + offset_ligature_set,
- length - offset_ligature_set, num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse ligature set %d", i);
- }
- }
-
- if (offset_coverage < ligature_set_end || offset_coverage >= length) {
- return OTS_FAILURE_MSG("Bad coverage offset %d", offset_coverage);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage,
- length - offset_coverage, num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table");
- }
-
- return true;
-}
-
-// Lookup Type 5:
-// Contextual Substitution Subtable
-bool ParseContextSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- return ots::ParseContextSubtable(file, data, length, file->maxp->num_glyphs,
- file->gsub->num_lookups);
-}
-
-// Lookup Type 6:
-// Chaining Contextual Substitution Subtable
-bool ParseChainingContextSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data,
- const size_t length) {
- return ots::ParseChainingContextSubtable(file, data, length,
- file->maxp->num_glyphs,
- file->gsub->num_lookups);
-}
-
-// Lookup Type 7:
-// Extension Substition
-bool ParseExtensionSubstitution(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- return ots::ParseExtensionSubtable(file, data, length,
- &kGsubLookupSubtableParser);
-}
-
-// Lookup Type 8:
-// Reverse Chaining Contexual Single Substitution Subtable
-bool ParseReverseChainingContextSingleSubstitution(
- const ots::OpenTypeFile *file, const uint8_t *data, const size_t length) {
- ots::Buffer subtable(data, length);
-
- uint16_t format = 0;
- uint16_t offset_coverage = 0;
-
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage)) {
- return OTS_FAILURE_MSG("Failed to read reverse chaining header");
- }
-
- const uint16_t num_glyphs = file->maxp->num_glyphs;
-
- uint16_t backtrack_glyph_count = 0;
- if (!subtable.ReadU16(&backtrack_glyph_count)) {
- return OTS_FAILURE_MSG("Failed to read backtrack glyph count in reverse chaining table");
- }
- if (backtrack_glyph_count > num_glyphs) {
- return OTS_FAILURE_MSG("Bad backtrack glyph count of %d", backtrack_glyph_count);
- }
- std::vector<uint16_t> offsets_backtrack;
- offsets_backtrack.reserve(backtrack_glyph_count);
- for (unsigned i = 0; i < backtrack_glyph_count; ++i) {
- uint16_t offset = 0;
- if (!subtable.ReadU16(&offset)) {
- return OTS_FAILURE_MSG("Failed to read backtrack offset %d", i);
- }
- offsets_backtrack.push_back(offset);
- }
-
- uint16_t lookahead_glyph_count = 0;
- if (!subtable.ReadU16(&lookahead_glyph_count)) {
- return OTS_FAILURE_MSG("Failed to read look ahead glyph count");
- }
- if (lookahead_glyph_count > num_glyphs) {
- return OTS_FAILURE_MSG("Bad look ahead glyph count %d", lookahead_glyph_count);
- }
- std::vector<uint16_t> offsets_lookahead;
- offsets_lookahead.reserve(lookahead_glyph_count);
- for (unsigned i = 0; i < lookahead_glyph_count; ++i) {
- uint16_t offset = 0;
- if (!subtable.ReadU16(&offset)) {
- return OTS_FAILURE_MSG("Can't read look ahead offset %d", i);
- }
- offsets_lookahead.push_back(offset);
- }
-
- uint16_t glyph_count = 0;
- if (!subtable.ReadU16(&glyph_count)) {
- return OTS_FAILURE_MSG("Can't read glyph count in reverse chaining table");
- }
- if (glyph_count > num_glyphs) {
- return OTS_FAILURE_MSG("Bad glyph count of %d", glyph_count);
- }
- for (unsigned i = 0; i < glyph_count; ++i) {
- uint16_t substitute = 0;
- if (!subtable.ReadU16(&substitute)) {
- return OTS_FAILURE_MSG("Failed to read substitution %d reverse chaining table", i);
- }
- if (substitute >= num_glyphs) {
- return OTS_FAILURE_MSG("Bad substitute glyph %d in reverse chaining table substitution %d", substitute, i);
- }
- }
-
- const unsigned substitute_end = static_cast<unsigned>(10) +
- (backtrack_glyph_count + lookahead_glyph_count + glyph_count) * 2;
- if (substitute_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad substitute end offset in reverse chaining table");
- }
-
- if (offset_coverage < substitute_end || offset_coverage >= length) {
- return OTS_FAILURE_MSG("Bad coverage offset %d in reverse chaining table", offset_coverage);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage,
- length - offset_coverage, num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table in reverse chaining table");
- }
-
- for (unsigned i = 0; i < backtrack_glyph_count; ++i) {
- if (offsets_backtrack[i] < substitute_end ||
- offsets_backtrack[i] >= length) {
- return OTS_FAILURE_MSG("Bad backtrack offset %d for backtrack %d in reverse chaining table", offsets_backtrack[i], i);
- }
- if (!ots::ParseCoverageTable(file, data + offsets_backtrack[i],
- length - offsets_backtrack[i], num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table for backtrack %d in reverse chaining table", i);
- }
- }
-
- for (unsigned i = 0; i < lookahead_glyph_count; ++i) {
- if (offsets_lookahead[i] < substitute_end ||
- offsets_lookahead[i] >= length) {
- return OTS_FAILURE_MSG("Bad lookahead offset %d for lookahead %d in reverse chaining table", offsets_lookahead[i], i);
- }
- if (!ots::ParseCoverageTable(file, data + offsets_lookahead[i],
- length - offsets_lookahead[i], num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse lookahead coverage table %d in reverse chaining table", i);
- }
- }
-
- return true;
-}
-
-} // namespace
-
-#define DROP_THIS_TABLE(msg_) \
- do { \
- OTS_FAILURE_MSG(msg_ ", table discarded"); \
- file->gsub->data = 0; \
- file->gsub->length = 0; \
- } while (0)
-
-namespace ots {
-
-// As far as I checked, following fonts contain invalid values in GSUB table.
-// OTS will drop their GSUB table.
-//
-// # too large substitute (value is 0xFFFF)
-// kaiu.ttf
-// mingliub2.ttf
-// mingliub1.ttf
-// mingliub0.ttf
-// GraublauWeb.otf
-// GraublauWebBold.otf
-//
-// # too large alternate (value is 0xFFFF)
-// ManchuFont.ttf
-//
-// # bad offset to lang sys table (NULL offset)
-// DejaVuMonoSansBold.ttf
-// DejaVuMonoSansBoldOblique.ttf
-// DejaVuMonoSansOblique.ttf
-// DejaVuSansMono-BoldOblique.ttf
-// DejaVuSansMono-Oblique.ttf
-// DejaVuSansMono-Bold.ttf
-//
-// # bad start coverage index
-// GenBasBI.ttf
-// GenBasI.ttf
-// AndBasR.ttf
-// GenBkBasI.ttf
-// CharisSILR.ttf
-// CharisSILBI.ttf
-// CharisSILI.ttf
-// CharisSILB.ttf
-// DoulosSILR.ttf
-// CharisSILBI.ttf
-// GenBkBasB.ttf
-// GenBkBasR.ttf
-// GenBkBasBI.ttf
-// GenBasB.ttf
-// GenBasR.ttf
-//
-// # glyph range is overlapping
-// KacstTitleL.ttf
-// KacstDecorative.ttf
-// KacstTitle.ttf
-// KacstArt.ttf
-// KacstPoster.ttf
-// KacstQurn.ttf
-// KacstDigital.ttf
-// KacstBook.ttf
-// KacstFarsi.ttf
-
-bool ots_gsub_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
- // Parsing gsub table requires |file->maxp->num_glyphs|
- if (!file->maxp) {
- return OTS_FAILURE_MSG("Missing maxp table in font, needed by GSUB");
- }
-
- Buffer table(data, length);
-
- OpenTypeGSUB *gsub = new OpenTypeGSUB;
- file->gsub = gsub;
-
- uint32_t version = 0;
- uint16_t offset_script_list = 0;
- uint16_t offset_feature_list = 0;
- uint16_t offset_lookup_list = 0;
- if (!table.ReadU32(&version) ||
- !table.ReadU16(&offset_script_list) ||
- !table.ReadU16(&offset_feature_list) ||
- !table.ReadU16(&offset_lookup_list)) {
- DROP_THIS_TABLE("Incomplete table");
- return true;
- }
-
- if (version != 0x00010000) {
- DROP_THIS_TABLE("Bad version");
- return true;
- }
-
- if (offset_lookup_list) {
- if (offset_lookup_list < kGsubHeaderSize || offset_lookup_list >= length) {
- DROP_THIS_TABLE("Bad lookup list offset in table header");
- return true;
- }
-
- if (!ParseLookupListTable(file, data + offset_lookup_list,
- length - offset_lookup_list,
- &kGsubLookupSubtableParser,
- &gsub->num_lookups)) {
- DROP_THIS_TABLE("Failed to parse lookup list table");
- return true;
- }
- }
-
- uint16_t num_features = 0;
- if (offset_feature_list) {
- if (offset_feature_list < kGsubHeaderSize || offset_feature_list >= length) {
- DROP_THIS_TABLE("Bad feature list offset in table header");
- return true;
- }
-
- if (!ParseFeatureListTable(file, data + offset_feature_list,
- length - offset_feature_list, gsub->num_lookups,
- &num_features)) {
- DROP_THIS_TABLE("Failed to parse feature list table");
- return true;
- }
- }
-
- if (offset_script_list) {
- if (offset_script_list < kGsubHeaderSize || offset_script_list >= length) {
- DROP_THIS_TABLE("Bad script list offset in table header");
- return true;
- }
-
- if (!ParseScriptListTable(file, data + offset_script_list,
- length - offset_script_list, num_features)) {
- DROP_THIS_TABLE("Failed to parse script list table");
- return true;
- }
- }
-
- gsub->data = data;
- gsub->length = length;
- return true;
-}
-
-bool ots_gsub_should_serialise(OpenTypeFile *file) {
- return file->gsub != NULL && file->gsub->data != NULL;
-}
-
-bool ots_gsub_serialise(OTSStream *out, OpenTypeFile *file) {
- if (!out->Write(file->gsub->data, file->gsub->length)) {
- return OTS_FAILURE_MSG("Failed to write GSUB table");
- }
-
- return true;
-}
-
-void ots_gsub_free(OpenTypeFile *file) {
- delete file->gsub;
-}
-
-} // namespace ots
-
-#undef TABLE_NAME
-#undef DROP_THIS_TABLE
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