The Tor Browser: comparison gfx/ots/src/post.cc

--1:000000000000
+:76da4de9a570
+// 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 "post.h"
+#include "maxp.h"
+// post - PostScript
+// http://www.microsoft.com/typography/otspec/post.htm
+#define TABLE_NAME "post"
+namespace ots {
+bool ots_post_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
+Buffer table(data, length);
+OpenTypePOST *post = new OpenTypePOST;
+file->post = post;
+if (!table.ReadU32(&post->version) ||
+!table.ReadU32(&post->italic_angle) ||
+!table.ReadS16(&post->underline) ||
+!table.ReadS16(&post->underline_thickness) ||
+!table.ReadU32(&post->is_fixed_pitch)) {
+return OTS_FAILURE_MSG("Failed to read post header");
+}
+if (post->underline_thickness < 0) {
+post->underline_thickness = 1;
+}
+if (post->version == 0x00010000) {
+return true;
+} else if (post->version == 0x00030000) {
+return true;
+} else if (post->version != 0x00020000) {
+// 0x00025000 is deprecated. We don't accept it.
+return OTS_FAILURE_MSG("Bad post version %x", post->version);
+}
+// We have a version 2 table with a list of Pascal strings at the end
+// We don't care about the memory usage fields. We'll set all these to zero
+// when serialising
+if (!table.Skip(16)) {
+return OTS_FAILURE_MSG("Failed to skip memory usage in post table");
+}
+uint16_t num_glyphs = 0;
+if (!table.ReadU16(&num_glyphs)) {
+return OTS_FAILURE_MSG("Failed to read number of glyphs");
+}
+if (!file->maxp) {
+return OTS_FAILURE_MSG("No maxp table required by post table");
+}
+if (num_glyphs == 0) {
+if (file->maxp->num_glyphs > 258) {
+return OTS_FAILURE_MSG("Can't have no glyphs in the post table if there are more than 256 glyphs in the font");
+}
+OTS_WARNING("table version is 1, but no glyf names are found");
+// workaround for fonts in http://www.fontsquirrel.com/fontface
+// (e.g., yataghan.ttf).
+post->version = 0x00010000;
+return true;
+}
+if (num_glyphs != file->maxp->num_glyphs) {
+// Note: Fixedsys500c.ttf seems to have inconsistent num_glyphs values.
+return OTS_FAILURE_MSG("Bad number of glyphs in post table %d", num_glyphs);
+}
+post->glyph_name_index.resize(num_glyphs);
+for (unsigned i = 0; i < num_glyphs; ++i) {
+if (!table.ReadU16(&post->glyph_name_index[i])) {
+return OTS_FAILURE_MSG("Failed to read post information for glyph %d", i);
+}
+// Note: A strict interpretation of the specification requires name indexes
+// are less than 32768. This, however, excludes fonts like unifont.ttf
+// which cover all of unicode.
+}
+// Now we have an array of Pascal strings. We have to check that they are all
+// valid and read them in.
+const size_t strings_offset = table.offset();
+const uint8_t *strings = data + strings_offset;
+const uint8_t *strings_end = data + length;
+for (;;) {
+if (strings == strings_end) break;
+const unsigned string_length = *strings;
+if (strings + 1 + string_length > strings_end) {
+return OTS_FAILURE_MSG("Bad string length %d", string_length);
+}
+if (std::memchr(strings + 1, '\0', string_length)) {
+return OTS_FAILURE_MSG("Bad string of length %d", string_length);
+}
+post->names.push_back(
+std::string(reinterpret_cast<const char*>(strings + 1), string_length));
+strings += 1 + string_length;
+}
+const unsigned num_strings = post->names.size();
+// check that all the references are within bounds
+for (unsigned i = 0; i < num_glyphs; ++i) {
+unsigned offset = post->glyph_name_index[i];
+if (offset < 258) {
+continue;
+}
+offset -= 258;
+if (offset >= num_strings) {
+return OTS_FAILURE_MSG("Bad string index %d", offset);
+}
+}
+return true;
+}
+bool ots_post_should_serialise(OpenTypeFile *file) {
+return file->post != NULL;
+}
+bool ots_post_serialise(OTSStream *out, OpenTypeFile *file) {
+const OpenTypePOST *post = file->post;
+// OpenType with CFF glyphs must have v3 post table.
+if (file->post && file->cff && file->post->version != 0x00030000) {
+return OTS_FAILURE_MSG("Bad post version %x", post->version);
+}
+if (!out->WriteU32(post->version) ||
+!out->WriteU32(post->italic_angle) ||
+!out->WriteS16(post->underline) ||
+!out->WriteS16(post->underline_thickness) ||
+!out->WriteU32(post->is_fixed_pitch) ||
+!out->WriteU32(0) ||
+!out->WriteU32(0) ||
+!out->WriteU32(0) ||
+!out->WriteU32(0)) {
+return OTS_FAILURE_MSG("Failed to write post header");
+}
+if (post->version != 0x00020000) {
+return true;  // v1.0 and v3.0 does not have glyph names.
+}
+if (!out->WriteU16(post->glyph_name_index.size())) {
+return OTS_FAILURE_MSG("Failed to write number of indices");
+}
+for (unsigned i = 0; i < post->glyph_name_index.size(); ++i) {
+if (!out->WriteU16(post->glyph_name_index[i])) {
+return OTS_FAILURE_MSG("Failed to write name index %d", i);
+}
+}
+// Now we just have to write out the strings in the correct order
+for (unsigned i = 0; i < post->names.size(); ++i) {
+const std::string& s = post->names[i];
+const uint8_t string_length = s.size();
+if (!out->Write(&string_length, 1)) {
+return OTS_FAILURE_MSG("Failed to write string %d", i);
+}
+// Some ttf fonts (e.g., frank.ttf on Windows Vista) have zero-length name.
+// We allow them.
+if (string_length > 0 && !out->Write(s.data(), string_length)) {
+return OTS_FAILURE_MSG("Failed to write string length for string %d", i);
+}
+}
+return true;
+}
+void ots_post_free(OpenTypeFile *file) {
+delete file->post;
+}
+}  // namespace ots

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comparison: gfx/ots/src/post.cc

gfx/ots/src/post.cc