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Unified Diff: third_party/ots/src/gpos.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/gpos.cc
diff --git a/third_party/ots/src/gpos.cc b/third_party/ots/src/gpos.cc
deleted file mode 100644
index a2b968726e2793b52e1574fffbbf999819e1c286..0000000000000000000000000000000000000000
--- a/third_party/ots/src/gpos.cc
+++ /dev/null
@@ -1,828 +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 "gpos.h"
-
-#include <limits>
-#include <vector>
-
-#include "layout.h"
-#include "maxp.h"
-
-// GPOS - The Glyph Positioning Table
-// http://www.microsoft.com/typography/otspec/gpos.htm
-
-#define TABLE_NAME "GPOS"
-
-namespace {
-
-enum GPOS_TYPE {
- GPOS_TYPE_SINGLE_ADJUSTMENT = 1,
- GPOS_TYPE_PAIR_ADJUSTMENT = 2,
- GPOS_TYPE_CURSIVE_ATTACHMENT = 3,
- GPOS_TYPE_MARK_TO_BASE_ATTACHMENT = 4,
- GPOS_TYPE_MARK_TO_LIGATURE_ATTACHMENT = 5,
- GPOS_TYPE_MARK_TO_MARK_ATTACHMENT = 6,
- GPOS_TYPE_CONTEXT_POSITIONING = 7,
- GPOS_TYPE_CHAINED_CONTEXT_POSITIONING = 8,
- GPOS_TYPE_EXTENSION_POSITIONING = 9,
- GPOS_TYPE_RESERVED = 10
-};
-
-// The size of gpos header.
-const unsigned kGposHeaderSize = 10;
-// The maximum format number for anchor tables.
-const uint16_t kMaxAnchorFormat = 3;
-// The maximum number of class value.
-const uint16_t kMaxClassDefValue = 0xFFFF;
-
-// Lookup type parsers.
-bool ParseSingleAdjustment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParsePairAdjustment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseCursiveAttachment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseMarkToBaseAttachment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseMarkToLigatureAttachment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseMarkToMarkAttachment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseContextPositioning(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseChainedContextPositioning(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-bool ParseExtensionPositioning(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length);
-
-const ots::LookupSubtableParser::TypeParser kGposTypeParsers[] = {
- {GPOS_TYPE_SINGLE_ADJUSTMENT, ParseSingleAdjustment},
- {GPOS_TYPE_PAIR_ADJUSTMENT, ParsePairAdjustment},
- {GPOS_TYPE_CURSIVE_ATTACHMENT, ParseCursiveAttachment},
- {GPOS_TYPE_MARK_TO_BASE_ATTACHMENT, ParseMarkToBaseAttachment},
- {GPOS_TYPE_MARK_TO_LIGATURE_ATTACHMENT, ParseMarkToLigatureAttachment},
- {GPOS_TYPE_MARK_TO_MARK_ATTACHMENT, ParseMarkToMarkAttachment},
- {GPOS_TYPE_CONTEXT_POSITIONING, ParseContextPositioning},
- {GPOS_TYPE_CHAINED_CONTEXT_POSITIONING, ParseChainedContextPositioning},
- {GPOS_TYPE_EXTENSION_POSITIONING, ParseExtensionPositioning}
-};
-
-const ots::LookupSubtableParser kGposLookupSubtableParser = {
- arraysize(kGposTypeParsers),
- GPOS_TYPE_EXTENSION_POSITIONING, kGposTypeParsers
-};
-
-// Shared Tables: ValueRecord, Anchor Table, and MarkArray
-
-bool ParseValueRecord(const ots::OpenTypeFile *file,
- ots::Buffer* subtable, const uint8_t *data,
- const size_t length, const uint16_t value_format) {
- // Check existence of adjustment fields.
- for (unsigned i = 0; i < 4; ++i) {
- if ((value_format >> i) & 0x1) {
- // Just read the field since these fileds could take an arbitrary values.
- if (!subtable->Skip(2)) {
- return OTS_FAILURE_MSG("Failed to read value reacord component");
- }
- }
- }
-
- // Check existence of offsets to device table.
- for (unsigned i = 0; i < 4; ++i) {
- if ((value_format >> (i + 4)) & 0x1) {
- uint16_t offset = 0;
- if (!subtable->ReadU16(&offset)) {
- return OTS_FAILURE_MSG("Failed to read value record offset");
- }
- if (offset) {
- // TODO(bashi): Is it possible that device tables locate before
- // this record? No fonts contain such offset AKAIF.
- if (offset >= length) {
- return OTS_FAILURE_MSG("Value record offset too high %d >= %ld", offset, length);
- }
- if (!ots::ParseDeviceTable(file, data + offset, length - offset)) {
- return OTS_FAILURE_MSG("Failed to parse device table in value record");
- }
- }
- }
- }
- return true;
-}
-
-bool ParseAnchorTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- ots::Buffer subtable(data, length);
-
- uint16_t format = 0;
- // Read format and skip 2 2-byte fields that could be arbitrary values.
- if (!subtable.ReadU16(&format) ||
- !subtable.Skip(4)) {
- return OTS_FAILURE_MSG("Faled to read anchor table");
- }
-
- if (format == 0 || format > kMaxAnchorFormat) {
- return OTS_FAILURE_MSG("Bad Anchor table format %d", format);
- }
-
- // Format 2 and 3 has additional fields.
- if (format == 2) {
- // Format 2 provides an index to a glyph contour point, which will take
- // arbitrary value.
- uint16_t anchor_point = 0;
- if (!subtable.ReadU16(&anchor_point)) {
- return OTS_FAILURE_MSG("Failed to read anchor point in format 2 Anchor Table");
- }
- } else if (format == 3) {
- uint16_t offset_x_device = 0;
- uint16_t offset_y_device = 0;
- if (!subtable.ReadU16(&offset_x_device) ||
- !subtable.ReadU16(&offset_y_device)) {
- return OTS_FAILURE_MSG("Failed to read device table offsets in format 3 anchor table");
- }
- const unsigned format_end = static_cast<unsigned>(10);
- if (offset_x_device) {
- if (offset_x_device < format_end || offset_x_device >= length) {
- return OTS_FAILURE_MSG("Bad x device table offset %d", offset_x_device);
- }
- if (!ots::ParseDeviceTable(file, data + offset_x_device,
- length - offset_x_device)) {
- return OTS_FAILURE_MSG("Failed to parse device table in anchor table");
- }
- }
- if (offset_y_device) {
- if (offset_y_device < format_end || offset_y_device >= length) {
- return OTS_FAILURE_MSG("Bad y device table offset %d", offset_y_device);
- }
- if (!ots::ParseDeviceTable(file, data + offset_y_device,
- length - offset_y_device)) {
- return OTS_FAILURE_MSG("Failed to parse device table in anchor table");
- }
- }
- }
- return true;
-}
-
-bool ParseMarkArrayTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t class_count) {
- ots::Buffer subtable(data, length);
-
- uint16_t mark_count = 0;
- if (!subtable.ReadU16(&mark_count)) {
- return OTS_FAILURE_MSG("Can't read mark table length");
- }
-
- // MarkRecord consists of 4-bytes.
- const unsigned mark_records_end = 4 * static_cast<unsigned>(mark_count) + 2;
- if (mark_records_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad mark table length");
- }
- for (unsigned i = 0; i < mark_count; ++i) {
- uint16_t class_value = 0;
- uint16_t offset_mark_anchor = 0;
- if (!subtable.ReadU16(&class_value) ||
- !subtable.ReadU16(&offset_mark_anchor)) {
- return OTS_FAILURE_MSG("Can't read mark table %d", i);
- }
- // |class_value| may take arbitrary values including 0 here so we don't
- // check the value.
- if (offset_mark_anchor < mark_records_end ||
- offset_mark_anchor >= length) {
- return OTS_FAILURE_MSG("Bad mark anchor offset %d for mark table %d", offset_mark_anchor, i);
- }
- if (!ParseAnchorTable(file, data + offset_mark_anchor,
- length - offset_mark_anchor)) {
- return OTS_FAILURE_MSG("Faled to parse anchor table for mark table %d", i);
- }
- }
-
- return true;
-}
-
-// Lookup Type 1:
-// Single Adjustment Positioning Subtable
-bool ParseSingleAdjustment(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 value_format = 0;
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage) ||
- !subtable.ReadU16(&value_format)) {
- return OTS_FAILURE_MSG("Can't read single adjustment information");
- }
-
- if (format == 1) {
- // Format 1 exactly one value record.
- if (!ParseValueRecord(file, &subtable, data, length, value_format)) {
- return OTS_FAILURE_MSG("Failed to parse format 1 single adjustment table");
- }
- } else if (format == 2) {
- uint16_t value_count = 0;
- if (!subtable.ReadU16(&value_count)) {
- return OTS_FAILURE_MSG("Failed to parse format 2 single adjustment table");
- }
- for (unsigned i = 0; i < value_count; ++i) {
- if (!ParseValueRecord(file, &subtable, data, length, value_format)) {
- return OTS_FAILURE_MSG("Failed to parse value record %d in format 2 single adjustment table", i);
- }
- }
- } else {
- return OTS_FAILURE_MSG("Bad format %d in single adjustment table", format);
- }
-
- if (offset_coverage < subtable.offset() || offset_coverage >= length) {
- return OTS_FAILURE_MSG("Bad coverage offset %d in single adjustment table", offset_coverage);
- }
-
- if (!ots::ParseCoverageTable(file, data + offset_coverage,
- length - offset_coverage,
- file->maxp->num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table in single adjustment table");
- }
-
- return true;
-}
-
-bool ParsePairSetTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t value_format1,
- const uint16_t value_format2,
- const uint16_t num_glyphs) {
- ots::Buffer subtable(data, length);
-
- uint16_t value_count = 0;
- if (!subtable.ReadU16(&value_count)) {
- return OTS_FAILURE_MSG("Failed to read pair set table structure");
- }
- for (unsigned i = 0; i < value_count; ++i) {
- // Check pair value record.
- uint16_t glyph_id = 0;
- if (!subtable.ReadU16(&glyph_id)) {
- return OTS_FAILURE_MSG("Failed to read glyph in pair value record %d", i);
- }
- if (glyph_id >= num_glyphs) {
- return OTS_FAILURE_MSG("glyph id %d too high >= %d", glyph_id, num_glyphs);
- }
- if (!ParseValueRecord(file, &subtable, data, length, value_format1)) {
- return OTS_FAILURE_MSG("Failed to parse value record in format 1 pair set table");
- }
- if (!ParseValueRecord(file, &subtable, data, length, value_format2)) {
- return OTS_FAILURE_MSG("Failed to parse value record in format 2 pair set table");
- }
- }
- return true;
-}
-
-bool ParsePairPosFormat1(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t value_format1,
- const uint16_t value_format2,
- const uint16_t num_glyphs) {
- ots::Buffer subtable(data, length);
-
- // Skip 8 bytes that are already read before.
- if (!subtable.Skip(8)) {
- return OTS_FAILURE_MSG("Failed to read pair pos table structure");
- }
-
- uint16_t pair_set_count = 0;
- if (!subtable.ReadU16(&pair_set_count)) {
- return OTS_FAILURE_MSG("Failed to read pair pos set count");
- }
-
- const unsigned pair_pos_end = 2 * static_cast<unsigned>(pair_set_count) + 10;
- if (pair_pos_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad pair set length %d", pair_pos_end);
- }
- for (unsigned i = 0; i < pair_set_count; ++i) {
- uint16_t pair_set_offset = 0;
- if (!subtable.ReadU16(&pair_set_offset)) {
- return OTS_FAILURE_MSG("Failed to read pair set offset for pair set %d", i);
- }
- if (pair_set_offset < pair_pos_end || pair_set_offset >= length) {
- return OTS_FAILURE_MSG("Bad pair set offset %d for pair set %d", pair_set_offset, i);
- }
- // Check pair set tables
- if (!ParsePairSetTable(file, data + pair_set_offset, length - pair_set_offset,
- value_format1, value_format2,
- num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse pair set table %d", i);
- }
- }
-
- return true;
-}
-
-bool ParsePairPosFormat2(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t value_format1,
- const uint16_t value_format2,
- const uint16_t num_glyphs) {
- ots::Buffer subtable(data, length);
-
- // Skip 8 bytes that are already read before.
- if (!subtable.Skip(8)) {
- return OTS_FAILURE_MSG("Failed to read pair pos format 2 structure");
- }
-
- uint16_t offset_class_def1 = 0;
- uint16_t offset_class_def2 = 0;
- uint16_t class1_count = 0;
- uint16_t class2_count = 0;
- if (!subtable.ReadU16(&offset_class_def1) ||
- !subtable.ReadU16(&offset_class_def2) ||
- !subtable.ReadU16(&class1_count) ||
- !subtable.ReadU16(&class2_count)) {
- return OTS_FAILURE_MSG("Failed to read pair pos format 2 data");
- }
-
- // Check class 1 records.
- for (unsigned i = 0; i < class1_count; ++i) {
- // Check class 2 records.
- for (unsigned j = 0; j < class2_count; ++j) {
- if (value_format1 && !ParseValueRecord(file, &subtable, data, length,
- value_format1)) {
- return OTS_FAILURE_MSG("Failed to parse value record 1 %d and %d", j, i);
- }
- if (value_format2 && !ParseValueRecord(file, &subtable, data, length,
- value_format2)) {
- return OTS_FAILURE_MSG("Falied to parse value record 2 %d and %d", j, i);
- }
- }
- }
-
- // Check class definition tables.
- if (offset_class_def1 < subtable.offset() || offset_class_def1 >= length ||
- offset_class_def2 < subtable.offset() || offset_class_def2 >= length) {
- return OTS_FAILURE_MSG("Bad class definition table offsets %d or %d", offset_class_def1, offset_class_def2);
- }
- if (!ots::ParseClassDefTable(file, data + offset_class_def1,
- length - offset_class_def1,
- num_glyphs, kMaxClassDefValue)) {
- return OTS_FAILURE_MSG("Failed to parse class definition table 1");
- }
- if (!ots::ParseClassDefTable(file, data + offset_class_def2,
- length - offset_class_def2,
- num_glyphs, kMaxClassDefValue)) {
- return OTS_FAILURE_MSG("Failed to parse class definition table 2");
- }
-
- return true;
-}
-
-// Lookup Type 2:
-// Pair Adjustment Positioning Subtable
-bool ParsePairAdjustment(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 value_format1 = 0;
- uint16_t value_format2 = 0;
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage) ||
- !subtable.ReadU16(&value_format1) ||
- !subtable.ReadU16(&value_format2)) {
- return OTS_FAILURE_MSG("Failed to read pair adjustment structure");
- }
-
- if (format == 1) {
- if (!ParsePairPosFormat1(file, data, length, value_format1, value_format2,
- file->maxp->num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse pair pos format 1");
- }
- } else if (format == 2) {
- if (!ParsePairPosFormat2(file, data, length, value_format1, value_format2,
- file->maxp->num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse pair format 2");
- }
- } else {
- return OTS_FAILURE_MSG("Bad pos pair format %d", format);
- }
-
- if (offset_coverage < subtable.offset() || offset_coverage >= length) {
- return OTS_FAILURE_MSG("Bad pair pos offset coverage %d", offset_coverage);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage,
- length - offset_coverage,
- file->maxp->num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table");
- }
-
- return true;
-}
-
-// Lookup Type 3
-// Cursive Attachment Positioning Subtable
-bool ParseCursiveAttachment(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 entry_exit_count = 0;
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage) ||
- !subtable.ReadU16(&entry_exit_count)) {
- return OTS_FAILURE_MSG("Failed to read cursive attachment structure");
- }
-
- if (format != 1) {
- return OTS_FAILURE_MSG("Bad cursive attachment format %d", format);
- }
-
- // Check entry exit records.
- const unsigned entry_exit_records_end =
- 2 * static_cast<unsigned>(entry_exit_count) + 6;
- if (entry_exit_records_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad entry exit record end %d", entry_exit_records_end);
- }
- for (unsigned i = 0; i < entry_exit_count; ++i) {
- uint16_t offset_entry_anchor = 0;
- uint16_t offset_exit_anchor = 0;
- if (!subtable.ReadU16(&offset_entry_anchor) ||
- !subtable.ReadU16(&offset_exit_anchor)) {
- return OTS_FAILURE_MSG("Can't read entry exit record %d", i);
- }
- // These offsets could be NULL.
- if (offset_entry_anchor) {
- if (offset_entry_anchor < entry_exit_records_end ||
- offset_entry_anchor >= length) {
- return OTS_FAILURE_MSG("Bad entry anchor offset %d in entry exit record %d", offset_entry_anchor, i);
- }
- if (!ParseAnchorTable(file, data + offset_entry_anchor,
- length - offset_entry_anchor)) {
- return OTS_FAILURE_MSG("Failed to parse entry anchor table in entry exit record %d", i);
- }
- }
- if (offset_exit_anchor) {
- if (offset_exit_anchor < entry_exit_records_end ||
- offset_exit_anchor >= length) {
- return OTS_FAILURE_MSG("Bad exit anchor offset %d in entry exit record %d", offset_exit_anchor, i);
- }
- if (!ParseAnchorTable(file, data + offset_exit_anchor,
- length - offset_exit_anchor)) {
- return OTS_FAILURE_MSG("Failed to parse exit anchor table in entry exit record %d", i);
- }
- }
- }
-
- if (offset_coverage < subtable.offset() || offset_coverage >= length) {
- return OTS_FAILURE_MSG("Bad coverage offset in cursive attachment %d", offset_coverage);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage,
- length - offset_coverage,
- file->maxp->num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table in cursive attachment");
- }
-
- return true;
-}
-
-bool ParseAnchorArrayTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t class_count) {
- ots::Buffer subtable(data, length);
-
- uint16_t record_count = 0;
- if (!subtable.ReadU16(&record_count)) {
- return OTS_FAILURE_MSG("Can't read anchor array length");
- }
-
- const unsigned anchor_array_end = 2 * static_cast<unsigned>(record_count) *
- static_cast<unsigned>(class_count) + 2;
- if (anchor_array_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad end of anchor array %d", anchor_array_end);
- }
- for (unsigned i = 0; i < record_count; ++i) {
- for (unsigned j = 0; j < class_count; ++j) {
- uint16_t offset_record = 0;
- if (!subtable.ReadU16(&offset_record)) {
- return OTS_FAILURE_MSG("Can't read anchor array record offset for class %d and record %d", j, i);
- }
- // |offset_record| could be NULL.
- if (offset_record) {
- if (offset_record < anchor_array_end || offset_record >= length) {
- return OTS_FAILURE_MSG("Bad record offset %d in class %d, record %d", offset_record, j, i);
- }
- if (!ParseAnchorTable(file, data + offset_record,
- length - offset_record)) {
- return OTS_FAILURE_MSG("Failed to parse anchor table for class %d, record %d", j, i);
- }
- }
- }
- }
- return true;
-}
-
-bool ParseLigatureArrayTable(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const uint16_t class_count) {
- ots::Buffer subtable(data, length);
-
- uint16_t ligature_count = 0;
- if (!subtable.ReadU16(&ligature_count)) {
- return OTS_FAILURE_MSG("Failed to read ligature count");
- }
- for (unsigned i = 0; i < ligature_count; ++i) {
- uint16_t offset_ligature_attach = 0;
- if (!subtable.ReadU16(&offset_ligature_attach)) {
- return OTS_FAILURE_MSG("Can't read ligature offset %d", i);
- }
- if (offset_ligature_attach < 2 || offset_ligature_attach >= length) {
- return OTS_FAILURE_MSG("Bad ligature attachment offset %d in ligature %d", offset_ligature_attach, i);
- }
- if (!ParseAnchorArrayTable(file, data + offset_ligature_attach,
- length - offset_ligature_attach, class_count)) {
- return OTS_FAILURE_MSG("Failed to parse anchor table for ligature %d", i);
- }
- }
- return true;
-}
-
-// Common parser for Lookup Type 4, 5 and 6.
-bool ParseMarkToAttachmentSubtables(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length,
- const GPOS_TYPE type) {
- ots::Buffer subtable(data, length);
-
- uint16_t format = 0;
- uint16_t offset_coverage1 = 0;
- uint16_t offset_coverage2 = 0;
- uint16_t class_count = 0;
- uint16_t offset_mark_array = 0;
- uint16_t offset_type_specific_array = 0;
- if (!subtable.ReadU16(&format) ||
- !subtable.ReadU16(&offset_coverage1) ||
- !subtable.ReadU16(&offset_coverage2) ||
- !subtable.ReadU16(&class_count) ||
- !subtable.ReadU16(&offset_mark_array) ||
- !subtable.ReadU16(&offset_type_specific_array)) {
- return OTS_FAILURE_MSG("Failed to read mark attachment subtable header");
- }
-
- if (format != 1) {
- return OTS_FAILURE_MSG("bad mark attachment subtable format %d", format);
- }
-
- const unsigned header_end = static_cast<unsigned>(subtable.offset());
- if (header_end > std::numeric_limits<uint16_t>::max()) {
- return OTS_FAILURE_MSG("Bad mark attachment subtable size ending at %d", header_end);
- }
- if (offset_coverage1 < header_end || offset_coverage1 >= length) {
- return OTS_FAILURE_MSG("Bad coverage 1 offset %d", offset_coverage1);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage1,
- length - offset_coverage1,
- file->maxp->num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse converge 1 table");
- }
- if (offset_coverage2 < header_end || offset_coverage2 >= length) {
- return OTS_FAILURE_MSG("Bad coverage 2 offset %d", offset_coverage2);
- }
- if (!ots::ParseCoverageTable(file, data + offset_coverage2,
- length - offset_coverage2,
- file->maxp->num_glyphs)) {
- return OTS_FAILURE_MSG("Failed to parse coverage table 2");
- }
-
- if (offset_mark_array < header_end || offset_mark_array >= length) {
- return OTS_FAILURE_MSG("Bad mark array offset %d", offset_mark_array);
- }
- if (!ParseMarkArrayTable(file, data + offset_mark_array,
- length - offset_mark_array, class_count)) {
- return OTS_FAILURE_MSG("Failed to parse mark array");
- }
-
- if (offset_type_specific_array < header_end ||
- offset_type_specific_array >= length) {
- return OTS_FAILURE_MSG("Bad type specific array offset %d", offset_type_specific_array);
- }
- if (type == GPOS_TYPE_MARK_TO_BASE_ATTACHMENT ||
- type == GPOS_TYPE_MARK_TO_MARK_ATTACHMENT) {
- if (!ParseAnchorArrayTable(file, data + offset_type_specific_array,
- length - offset_type_specific_array,
- class_count)) {
- return OTS_FAILURE_MSG("Failed to parse anchor array");
- }
- } else if (type == GPOS_TYPE_MARK_TO_LIGATURE_ATTACHMENT) {
- if (!ParseLigatureArrayTable(file, data + offset_type_specific_array,
- length - offset_type_specific_array,
- class_count)) {
- return OTS_FAILURE_MSG("Failed to parse ligature array");
- }
- } else {
- return OTS_FAILURE_MSG("Bad attachment type %d", type);
- }
-
- return true;
-}
-
-// Lookup Type 4:
-// MarkToBase Attachment Positioning Subtable
-bool ParseMarkToBaseAttachment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- return ParseMarkToAttachmentSubtables(file, data, length,
- GPOS_TYPE_MARK_TO_BASE_ATTACHMENT);
-}
-
-// Lookup Type 5:
-// MarkToLigature Attachment Positioning Subtable
-bool ParseMarkToLigatureAttachment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- return ParseMarkToAttachmentSubtables(file, data, length,
- GPOS_TYPE_MARK_TO_LIGATURE_ATTACHMENT);
-}
-
-// Lookup Type 6:
-// MarkToMark Attachment Positioning Subtable
-bool ParseMarkToMarkAttachment(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- return ParseMarkToAttachmentSubtables(file, data, length,
- GPOS_TYPE_MARK_TO_MARK_ATTACHMENT);
-}
-
-// Lookup Type 7:
-// Contextual Positioning Subtables
-bool ParseContextPositioning(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- return ots::ParseContextSubtable(file, data, length, file->maxp->num_glyphs,
- file->gpos->num_lookups);
-}
-
-// Lookup Type 8:
-// Chaining Contexual Positioning Subtable
-bool ParseChainedContextPositioning(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- return ots::ParseChainingContextSubtable(file, data, length,
- file->maxp->num_glyphs,
- file->gpos->num_lookups);
-}
-
-// Lookup Type 9:
-// Extension Positioning
-bool ParseExtensionPositioning(const ots::OpenTypeFile *file,
- const uint8_t *data, const size_t length) {
- return ots::ParseExtensionSubtable(file, data, length,
- &kGposLookupSubtableParser);
-}
-
-} // namespace
-
-#define DROP_THIS_TABLE(msg_) \
- do { \
- OTS_FAILURE_MSG(msg_ ", table discarded"); \
- file->gpos->data = 0; \
- file->gpos->length = 0; \
- } while (0)
-
-namespace ots {
-
-// As far as I checked, following fonts contain invalid GPOS table and
-// OTS will drop their GPOS table.
-//
-// # invalid delta format in device table
-// samanata.ttf
-//
-// # bad size range in device table
-// Sarai_07.ttf
-//
-// # bad offset to PairSetTable
-// chandas1-2.ttf
-//
-// # bad offset to FeatureTable
-// glrso12.ttf
-// gllr12.ttf
-// glbo12.ttf
-// glb12.ttf
-// glro12.ttf
-// glbso12.ttf
-// glrc12.ttf
-// glrsc12.ttf
-// glbs12.ttf
-// glrs12.ttf
-// glr12.ttf
-//
-// # ScriptRecords aren't sorted by tag
-// Garogier_unhinted.otf
-//
-// # bad start coverage index in CoverageFormat2
-// AndBasR.ttf
-// CharisSILB.ttf
-// CharisSILBI.ttf
-// CharisSILI.ttf
-// CharisSILR.ttf
-// DoulosSILR.ttf
-// GenBasBI.ttf
-// GenBasI.ttf
-// GenBkBasI.ttf
-// GenBkBasB.ttf
-// GenBkBasR.ttf
-// Padauk-Bold.ttf
-// Padauk.ttf
-//
-// # Contour point indexes aren't sorted
-// Arial Unicode.ttf
-
-bool ots_gpos_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
- // Parsing GPOS table requires num_glyphs which is contained in maxp table.
- if (!file->maxp) {
- return OTS_FAILURE_MSG("missing maxp table needed in GPOS");
- }
-
- Buffer table(data, length);
-
- OpenTypeGPOS *gpos = new OpenTypeGPOS;
- file->gpos = gpos;
-
- 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 < kGposHeaderSize || 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,
- &kGposLookupSubtableParser,
- &gpos->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 < kGposHeaderSize || 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, gpos->num_lookups,
- &num_features)) {
- DROP_THIS_TABLE("Failed to parse feature list table");
- return true;
- }
- }
-
- if (offset_script_list) {
- if (offset_script_list < kGposHeaderSize || 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;
- }
- }
-
- gpos->data = data;
- gpos->length = length;
- return true;
-}
-
-bool ots_gpos_should_serialise(OpenTypeFile *file) {
- return file->gpos != NULL && file->gpos->data != NULL;
-}
-
-bool ots_gpos_serialise(OTSStream *out, OpenTypeFile *file) {
- if (!out->Write(file->gpos->data, file->gpos->length)) {
- return OTS_FAILURE_MSG("Failed to write GPOS table");
- }
-
- return true;
-}
-
-void ots_gpos_free(OpenTypeFile *file) {
- delete file->gpos;
-}
-
-} // namespace ots
-
-#undef TABLE_NAME
-#undef DROP_THIS_TABLE
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