summaryrefslogtreecommitdiffstats
path: root/gfx/ots/src/glat.cc
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/ots/src/glat.cc')
-rw-r--r--gfx/ots/src/glat.cc459
1 files changed, 459 insertions, 0 deletions
diff --git a/gfx/ots/src/glat.cc b/gfx/ots/src/glat.cc
new file mode 100644
index 000000000..23f7dfd9a
--- /dev/null
+++ b/gfx/ots/src/glat.cc
@@ -0,0 +1,459 @@
+// 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 "glat.h"
+
+#include "gloc.h"
+#include "mozilla/Compression.h"
+#include <list>
+
+namespace ots {
+
+// -----------------------------------------------------------------------------
+// OpenTypeGLAT_v1
+// -----------------------------------------------------------------------------
+
+bool OpenTypeGLAT_v1::Parse(const uint8_t* data, size_t length) {
+ Buffer table(data, length);
+ OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
+ GetFont()->GetTypedTable(OTS_TAG_GLOC));
+ if (!gloc) {
+ return DropGraphite("Required Gloc table is missing");
+ }
+
+ if (!table.ReadU32(&this->version) || this->version >> 16 != 1) {
+ return DropGraphite("Failed to read version");
+ }
+
+ const std::vector<uint32_t>& locations = gloc->GetLocations();
+ if (locations.empty()) {
+ return DropGraphite("No locations from Gloc table");
+ }
+ std::list<uint32_t> unverified(locations.begin(), locations.end());
+ while (table.remaining()) {
+ GlatEntry entry(this);
+ if (table.offset() > unverified.front()) {
+ return DropGraphite("Offset check failed for a GlatEntry");
+ }
+ if (table.offset() == unverified.front()) {
+ unverified.pop_front();
+ }
+ if (unverified.empty()) {
+ return DropGraphite("Expected more locations");
+ }
+ if (!entry.ParsePart(table)) {
+ return DropGraphite("Failed to read a GlatEntry");
+ }
+ this->entries.push_back(entry);
+ }
+
+ if (unverified.size() != 1 || unverified.front() != table.offset()) {
+ return DropGraphite("%zu location(s) could not be verified", unverified.size());
+ }
+ if (table.remaining()) {
+ return Warning("%zu bytes unparsed", table.remaining());
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v1::Serialize(OTSStream* out) {
+ if (!out->WriteU32(this->version) ||
+ !SerializeParts(this->entries, out)) {
+ return Error("Failed to write table");
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v1::GlatEntry::ParsePart(Buffer& table) {
+ if (!table.ReadU8(&this->attNum)) {
+ return parent->Error("GlatEntry: Failed to read attNum");
+ }
+ if (!table.ReadU8(&this->num)) {
+ return parent->Error("GlatEntry: Failed to read num");
+ }
+
+ //this->attributes.resize(this->num);
+ for (int i = 0; i < this->num; ++i) {
+ this->attributes.emplace_back();
+ if (!table.ReadS16(&this->attributes[i])) {
+ return parent->Error("GlatEntry: Failed to read attribute %u", i);
+ }
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v1::GlatEntry::SerializePart(OTSStream* out) const {
+ if (!out->WriteU8(this->attNum) ||
+ !out->WriteU8(this->num) ||
+ !SerializeParts(this->attributes, out)) {
+ return parent->Error("GlatEntry: Failed to write");
+ }
+ return true;
+}
+
+// -----------------------------------------------------------------------------
+// OpenTypeGLAT_v2
+// -----------------------------------------------------------------------------
+
+bool OpenTypeGLAT_v2::Parse(const uint8_t* data, size_t length) {
+ Buffer table(data, length);
+ OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
+ GetFont()->GetTypedTable(OTS_TAG_GLOC));
+ if (!gloc) {
+ return DropGraphite("Required Gloc table is missing");
+ }
+
+ if (!table.ReadU32(&this->version) || this->version >> 16 != 1) {
+ return DropGraphite("Failed to read version");
+ }
+
+ const std::vector<uint32_t>& locations = gloc->GetLocations();
+ if (locations.empty()) {
+ return DropGraphite("No locations from Gloc table");
+ }
+ std::list<uint32_t> unverified(locations.begin(), locations.end());
+ while (table.remaining()) {
+ GlatEntry entry(this);
+ if (table.offset() > unverified.front()) {
+ return DropGraphite("Offset check failed for a GlatEntry");
+ }
+ if (table.offset() == unverified.front()) {
+ unverified.pop_front();
+ }
+ if (unverified.empty()) {
+ return DropGraphite("Expected more locations");
+ }
+ if (!entry.ParsePart(table)) {
+ return DropGraphite("Failed to read a GlatEntry");
+ }
+ this->entries.push_back(entry);
+ }
+
+ if (unverified.size() != 1 || unverified.front() != table.offset()) {
+ return DropGraphite("%zu location(s) could not be verified", unverified.size());
+ }
+ if (table.remaining()) {
+ return Warning("%zu bytes unparsed", table.remaining());
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v2::Serialize(OTSStream* out) {
+ if (!out->WriteU32(this->version) ||
+ !SerializeParts(this->entries, out)) {
+ return Error("Failed to write table");
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v2::GlatEntry::ParsePart(Buffer& table) {
+ if (!table.ReadS16(&this->attNum)) {
+ return parent->Error("GlatEntry: Failed to read attNum");
+ }
+ if (!table.ReadS16(&this->num) || this->num < 0) {
+ return parent->Error("GlatEntry: Failed to read valid num");
+ }
+
+ //this->attributes.resize(this->num);
+ for (int i = 0; i < this->num; ++i) {
+ this->attributes.emplace_back();
+ if (!table.ReadS16(&this->attributes[i])) {
+ return parent->Error("GlatEntry: Failed to read attribute %u", i);
+ }
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v2::GlatEntry::SerializePart(OTSStream* out) const {
+ if (!out->WriteS16(this->attNum) ||
+ !out->WriteS16(this->num) ||
+ !SerializeParts(this->attributes, out)) {
+ return parent->Error("GlatEntry: Failed to write");
+ }
+ return true;
+}
+
+// -----------------------------------------------------------------------------
+// OpenTypeGLAT_v3
+// -----------------------------------------------------------------------------
+
+bool OpenTypeGLAT_v3::Parse(const uint8_t* data, size_t length,
+ bool prevent_decompression) {
+ Buffer table(data, length);
+ OpenTypeGLOC* gloc = static_cast<OpenTypeGLOC*>(
+ GetFont()->GetTypedTable(OTS_TAG_GLOC));
+ if (!gloc) {
+ return DropGraphite("Required Gloc table is missing");
+ }
+
+ if (!table.ReadU32(&this->version) || this->version >> 16 != 3) {
+ return DropGraphite("Failed to read version");
+ }
+ if (!table.ReadU32(&this->compHead)) {
+ return DropGraphite("Failed to read compression header");
+ }
+ switch ((this->compHead & SCHEME) >> 27) {
+ case 0: // uncompressed
+ break;
+ case 1: { // lz4
+ if (prevent_decompression) {
+ return DropGraphite("Illegal nested compression");
+ }
+ size_t decompressed_size = this->compHead & FULL_SIZE;
+ if (decompressed_size < length) {
+ return DropGraphite("Decompressed size is less than compressed size");
+ }
+ if (decompressed_size == 0) {
+ return DropGraphite("Decompressed size is set to 0");
+ }
+ // decompressed table must be <= 30MB
+ if (decompressed_size > 30 * 1024 * 1024) {
+ return DropGraphite("Decompressed size exceeds 30MB: %gMB",
+ decompressed_size / (1024.0 * 1024.0));
+ }
+ std::vector<uint8_t> decompressed(decompressed_size);
+ size_t outputSize = 0;
+ bool ret = mozilla::Compression::LZ4::decompressPartial(
+ reinterpret_cast<const char*>(data + table.offset()),
+ table.remaining(), // input buffer size (input size + padding)
+ reinterpret_cast<char*>(decompressed.data()),
+ decompressed.size(), // target output size
+ &outputSize); // return output size
+ if (!ret || outputSize != decompressed.size()) {
+ return DropGraphite("Decompression failed");
+ }
+ return this->Parse(decompressed.data(), decompressed.size(), true);
+ }
+ default:
+ return DropGraphite("Unknown compression scheme");
+ }
+ if (this->compHead & RESERVED) {
+ Warning("Nonzero reserved");
+ }
+
+ const std::vector<uint32_t>& locations = gloc->GetLocations();
+ if (locations.empty()) {
+ return DropGraphite("No locations from Gloc table");
+ }
+ std::list<uint32_t> unverified(locations.begin(), locations.end());
+ //this->entries.resize(locations.size() - 1, this);
+ for (size_t i = 0; i < locations.size() - 1; ++i) {
+ this->entries.emplace_back(this);
+ if (table.offset() != unverified.front()) {
+ return DropGraphite("Offset check failed for a GlyphAttrs");
+ }
+ unverified.pop_front();
+ if (!this->entries[i].ParsePart(table,
+ unverified.front() - table.offset())) {
+ // unverified.front() is guaranteed to exist because of the number of
+ // iterations of this loop
+ return DropGraphite("Failed to read a GlyphAttrs");
+ }
+ }
+
+ if (unverified.size() != 1 || unverified.front() != table.offset()) {
+ return DropGraphite("%zu location(s) could not be verified", unverified.size());
+ }
+ if (table.remaining()) {
+ return Warning("%zu bytes unparsed", table.remaining());
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::Serialize(OTSStream* out) {
+ if (!out->WriteU32(this->version) ||
+ !out->WriteU32(this->compHead) ||
+ !SerializeParts(this->entries, out)) {
+ return Error("Failed to write table");
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::GlyphAttrs::ParsePart(Buffer& table, const size_t size) {
+ size_t init_offset = table.offset();
+ if (parent->compHead & OCTABOXES && !octabox.ParsePart(table)) {
+ // parent->flags & 0b1: octaboxes are present flag
+ return parent->Error("GlyphAttrs: Failed to read octabox");
+ }
+
+ while (table.offset() < init_offset + size) {
+ GlatEntry entry(parent);
+ if (!entry.ParsePart(table)) {
+ return parent->Error("GlyphAttrs: Failed to read a GlatEntry");
+ }
+ this->entries.push_back(entry);
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::GlyphAttrs::SerializePart(OTSStream* out) const {
+ if ((parent->compHead & OCTABOXES && !octabox.SerializePart(out)) ||
+ !SerializeParts(this->entries, out)) {
+ return parent->Error("GlyphAttrs: Failed to write");
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::GlyphAttrs::
+OctaboxMetrics::ParsePart(Buffer& table) {
+ if (!table.ReadU16(&this->subbox_bitmap)) {
+ return parent->Error("OctaboxMetrics: Failed to read subbox_bitmap");
+ }
+ if (!table.ReadU8(&this->diag_neg_min)) {
+ return parent->Error("OctaboxMetrics: Failed to read diag_neg_min");
+ }
+ if (!table.ReadU8(&this->diag_neg_max) ||
+ this->diag_neg_max < this->diag_neg_min) {
+ return parent->Error("OctaboxMetrics: Failed to read valid diag_neg_max");
+ }
+ if (!table.ReadU8(&this->diag_pos_min)) {
+ return parent->Error("OctaboxMetrics: Failed to read diag_pos_min");
+ }
+ if (!table.ReadU8(&this->diag_pos_max) ||
+ this->diag_pos_max < this->diag_pos_min) {
+ return parent->Error("OctaboxMetrics: Failed to read valid diag_pos_max");
+ }
+
+ unsigned subboxes_len = 0; // count of 1's in this->subbox_bitmap
+ for (uint16_t i = this->subbox_bitmap; i; i >>= 1) {
+ if (i & 0b1) {
+ ++subboxes_len;
+ }
+ }
+ //this->subboxes.resize(subboxes_len, parent);
+ for (unsigned i = 0; i < subboxes_len; i++) {
+ this->subboxes.emplace_back(parent);
+ if (!this->subboxes[i].ParsePart(table)) {
+ return parent->Error("OctaboxMetrics: Failed to read subbox[%u]", i);
+ }
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::GlyphAttrs::
+OctaboxMetrics::SerializePart(OTSStream* out) const {
+ if (!out->WriteU16(this->subbox_bitmap) ||
+ !out->WriteU8(this->diag_neg_min) ||
+ !out->WriteU8(this->diag_neg_max) ||
+ !out->WriteU8(this->diag_pos_min) ||
+ !out->WriteU8(this->diag_pos_max) ||
+ !SerializeParts(this->subboxes, out)) {
+ return parent->Error("OctaboxMetrics: Failed to write");
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::GlyphAttrs::OctaboxMetrics::
+SubboxEntry::ParsePart(Buffer& table) {
+ if (!table.ReadU8(&this->left)) {
+ return parent->Error("SubboxEntry: Failed to read left");
+ }
+ if (!table.ReadU8(&this->right) || this->right < this->left) {
+ return parent->Error("SubboxEntry: Failed to read valid right");
+ }
+ if (!table.ReadU8(&this->bottom)) {
+ return parent->Error("SubboxEntry: Failed to read bottom");
+ }
+ if (!table.ReadU8(&this->top) || this->top < this->bottom) {
+ return parent->Error("SubboxEntry: Failed to read valid top");
+ }
+ if (!table.ReadU8(&this->diag_pos_min)) {
+ return parent->Error("SubboxEntry: Failed to read diag_pos_min");
+ }
+ if (!table.ReadU8(&this->diag_pos_max) ||
+ this->diag_pos_max < this->diag_pos_min) {
+ return parent->Error("SubboxEntry: Failed to read valid diag_pos_max");
+ }
+ if (!table.ReadU8(&this->diag_neg_min)) {
+ return parent->Error("SubboxEntry: Failed to read diag_neg_min");
+ }
+ if (!table.ReadU8(&this->diag_neg_max) ||
+ this->diag_neg_max < this->diag_neg_min) {
+ return parent->Error("SubboxEntry: Failed to read valid diag_neg_max");
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::GlyphAttrs::OctaboxMetrics::
+SubboxEntry::SerializePart(OTSStream* out) const {
+ if (!out->WriteU8(this->left) ||
+ !out->WriteU8(this->right) ||
+ !out->WriteU8(this->bottom) ||
+ !out->WriteU8(this->top) ||
+ !out->WriteU8(this->diag_pos_min) ||
+ !out->WriteU8(this->diag_pos_max) ||
+ !out->WriteU8(this->diag_neg_min) ||
+ !out->WriteU8(this->diag_neg_max)) {
+ return parent->Error("SubboxEntry: Failed to write");
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::GlyphAttrs::
+GlatEntry::ParsePart(Buffer& table) {
+ if (!table.ReadS16(&this->attNum)) {
+ return parent->Error("GlatEntry: Failed to read attNum");
+ }
+ if (!table.ReadS16(&this->num) || this->num < 0) {
+ return parent->Error("GlatEntry: Failed to read valid num");
+ }
+
+ //this->attributes.resize(this->num);
+ for (int i = 0; i < this->num; ++i) {
+ this->attributes.emplace_back();
+ if (!table.ReadS16(&this->attributes[i])) {
+ return parent->Error("GlatEntry: Failed to read attribute %u", i);
+ }
+ }
+ return true;
+}
+
+bool OpenTypeGLAT_v3::GlyphAttrs::
+GlatEntry::SerializePart(OTSStream* out) const {
+ if (!out->WriteS16(this->attNum) ||
+ !out->WriteS16(this->num) ||
+ !SerializeParts(this->attributes, out)) {
+ return parent->Error("GlatEntry: Failed to write");
+ }
+ return true;
+}
+
+// -----------------------------------------------------------------------------
+// OpenTypeGLAT
+// -----------------------------------------------------------------------------
+
+bool OpenTypeGLAT::Parse(const uint8_t* data, size_t length) {
+ if (GetFont()->dropped_graphite) {
+ return Drop("Skipping Graphite table");
+ }
+ Buffer table(data, length);
+ uint32_t version;
+ if (!table.ReadU32(&version)) {
+ return DropGraphite("Failed to read version");
+ }
+ switch (version >> 16) {
+ case 1:
+ this->handler = new OpenTypeGLAT_v1(this->font, this->tag);
+ break;
+ case 2:
+ this->handler = new OpenTypeGLAT_v2(this->font, this->tag);
+ break;
+ case 3: {
+ this->handler = new OpenTypeGLAT_v3(this->font, this->tag);
+ break;
+ }
+ default:
+ return DropGraphite("Unsupported table version: %u", version >> 16);
+ }
+ return this->handler->Parse(data, length);
+}
+
+bool OpenTypeGLAT::Serialize(OTSStream* out) {
+ if (!this->handler) {
+ return Error("No Glat table parsed");
+ }
+ return this->handler->Serialize(out);
+}
+
+} // namespace ots
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 19:35:44 +0000