diff options
Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-src/libs/woff2/src/font.cc')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-src/libs/woff2/src/font.cc | 400 |
1 files changed, 0 insertions, 400 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-src/libs/woff2/src/font.cc b/Build/source/texk/dvisvgm/dvisvgm-src/libs/woff2/src/font.cc deleted file mode 100644 index 1361f8c5dcc..00000000000 --- a/Build/source/texk/dvisvgm/dvisvgm-src/libs/woff2/src/font.cc +++ /dev/null @@ -1,400 +0,0 @@ -/* Copyright 2013 Google Inc. All Rights Reserved. - - Distributed under MIT license. - See file LICENSE for detail or copy at https://opensource.org/licenses/MIT -*/ - -/* Font management utilities */ - -#include "./font.h" - -#include <algorithm> - -#include "./buffer.h" -#include "./port.h" -#include "./store_bytes.h" -#include "./table_tags.h" -#include "./woff2_common.h" - -namespace woff2 { - -Font::Table* Font::FindTable(uint32_t tag) { - std::map<uint32_t, Font::Table>::iterator it = tables.find(tag); - return it == tables.end() ? 0 : &it->second; -} - -const Font::Table* Font::FindTable(uint32_t tag) const { - std::map<uint32_t, Font::Table>::const_iterator it = tables.find(tag); - return it == tables.end() ? 0 : &it->second; -} - -std::vector<uint32_t> Font::OutputOrderedTags() const { - std::vector<uint32_t> output_order; - - for (const auto& i : tables) { - const Font::Table& table = i.second; - // This is a transformed table, we will write it together with the - // original version. - if (table.tag & 0x80808080) { - continue; - } - output_order.push_back(table.tag); - } - - // Alphabetize then put loca immediately after glyf - auto glyf_loc = std::find(output_order.begin(), output_order.end(), - kGlyfTableTag); - auto loca_loc = std::find(output_order.begin(), output_order.end(), - kLocaTableTag); - if (glyf_loc != output_order.end() && loca_loc != output_order.end()) { - output_order.erase(loca_loc); - output_order.insert(std::find(output_order.begin(), output_order.end(), - kGlyfTableTag) + 1, kLocaTableTag); - } - - return output_order; -} - -bool ReadTrueTypeFont(Buffer* file, const uint8_t* data, size_t len, - Font* font) { - // We don't care about the search_range, entry_selector and range_shift - // fields, they will always be computed upon writing the font. - if (!file->ReadU16(&font->num_tables) || - !file->Skip(6)) { - return FONT_COMPRESSION_FAILURE(); - } - - std::map<uint32_t, uint32_t> intervals; - for (uint16_t i = 0; i < font->num_tables; ++i) { - Font::Table table; - table.flag_byte = 0; - table.reuse_of = NULL; - if (!file->ReadU32(&table.tag) || - !file->ReadU32(&table.checksum) || - !file->ReadU32(&table.offset) || - !file->ReadU32(&table.length)) { - return FONT_COMPRESSION_FAILURE(); - } - if ((table.offset & 3) != 0 || - table.length > len || - len - table.length < table.offset) { - return FONT_COMPRESSION_FAILURE(); - } - intervals[table.offset] = table.length; - table.data = data + table.offset; - if (font->tables.find(table.tag) != font->tables.end()) { - return FONT_COMPRESSION_FAILURE(); - } - font->tables[table.tag] = table; - } - - // Check that tables are non-overlapping. - uint32_t last_offset = 12UL + 16UL * font->num_tables; - for (const auto& i : intervals) { - if (i.first < last_offset || i.first + i.second < i.first) { - return FONT_COMPRESSION_FAILURE(); - } - last_offset = i.first + i.second; - } - - // Sanity check key tables - const Font::Table* head_table = font->FindTable(kHeadTableTag); - if (head_table != NULL && head_table->length < 52) { - return FONT_COMPRESSION_FAILURE(); - } - - return true; -} - -bool ReadCollectionFont(Buffer* file, const uint8_t* data, size_t len, - Font* font, - std::map<uint32_t, Font::Table*>* all_tables) { - if (!file->ReadU32(&font->flavor)) { - return FONT_COMPRESSION_FAILURE(); - } - if (!ReadTrueTypeFont(file, data, len, font)) { - return FONT_COMPRESSION_FAILURE(); - } - - for (auto& entry : font->tables) { - Font::Table& table = entry.second; - - if (all_tables->find(table.offset) == all_tables->end()) { - (*all_tables)[table.offset] = font->FindTable(table.tag); - } else { - table.reuse_of = (*all_tables)[table.offset]; - if (table.tag != table.reuse_of->tag) { - return FONT_COMPRESSION_FAILURE(); - } - } - - } - return true; -} - -bool ReadTrueTypeCollection(Buffer* file, const uint8_t* data, size_t len, - FontCollection* font_collection) { - uint32_t num_fonts; - - if (!file->ReadU32(&font_collection->header_version) || - !file->ReadU32(&num_fonts)) { - return FONT_COMPRESSION_FAILURE(); - } - - std::vector<uint32_t> offsets; - for (size_t i = 0; i < num_fonts; i++) { - uint32_t offset; - if (!file->ReadU32(&offset)) { - return FONT_COMPRESSION_FAILURE(); - } - offsets.push_back(offset); - } - - font_collection->fonts.resize(offsets.size()); - std::vector<Font>::iterator font_it = font_collection->fonts.begin(); - - std::map<uint32_t, Font::Table*> all_tables; - for (const auto offset : offsets) { - file->set_offset(offset); - Font& font = *font_it++; - if (!ReadCollectionFont(file, data, len, &font, &all_tables)) { - return FONT_COMPRESSION_FAILURE(); - } - } - - return true; -} - -bool ReadFont(const uint8_t* data, size_t len, Font* font) { - Buffer file(data, len); - - if (!file.ReadU32(&font->flavor)) { - return FONT_COMPRESSION_FAILURE(); - } - - if (font->flavor == kTtcFontFlavor) { - return FONT_COMPRESSION_FAILURE(); - } - return ReadTrueTypeFont(&file, data, len, font); -} - -bool ReadFontCollection(const uint8_t* data, size_t len, - FontCollection* font_collection) { - Buffer file(data, len); - - if (!file.ReadU32(&font_collection->flavor)) { - return FONT_COMPRESSION_FAILURE(); - } - - if (font_collection->flavor != kTtcFontFlavor) { - font_collection->fonts.resize(1); - Font& font = font_collection->fonts[0]; - font.flavor = font_collection->flavor; - return ReadTrueTypeFont(&file, data, len, &font); - } - return ReadTrueTypeCollection(&file, data, len, font_collection); -} - -size_t FontFileSize(const Font& font) { - size_t max_offset = 12ULL + 16ULL * font.num_tables; - for (const auto& i : font.tables) { - const Font::Table& table = i.second; - size_t padding_size = (4 - (table.length & 3)) & 3; - size_t end_offset = (padding_size + table.offset) + table.length; - max_offset = std::max(max_offset, end_offset); - } - return max_offset; -} - -size_t FontCollectionFileSize(const FontCollection& font_collection) { - size_t max_offset = 0; - for (auto& font : font_collection.fonts) { - // font file size actually just finds max offset - max_offset = std::max(max_offset, FontFileSize(font)); - } - return max_offset; -} - -bool WriteFont(const Font& font, uint8_t* dst, size_t dst_size) { - size_t offset = 0; - return WriteFont(font, &offset, dst, dst_size); -} - -bool WriteTableRecord(const Font::Table* table, size_t* offset, uint8_t* dst, - size_t dst_size) { - if (dst_size < *offset + kSfntEntrySize) { - return FONT_COMPRESSION_FAILURE(); - } - if (table->IsReused()) { - table = table->reuse_of; - } - StoreU32(table->tag, offset, dst); - StoreU32(table->checksum, offset, dst); - StoreU32(table->offset, offset, dst); - StoreU32(table->length, offset, dst); - return true; -} - -bool WriteTable(const Font::Table& table, size_t* offset, uint8_t* dst, - size_t dst_size) { - if (!WriteTableRecord(&table, offset, dst, dst_size)) { - return false; - } - - // Write the actual table data if it's the first time we've seen it - if (!table.IsReused()) { - if (table.offset + table.length < table.offset || - dst_size < table.offset + table.length) { - return FONT_COMPRESSION_FAILURE(); - } - memcpy(dst + table.offset, table.data, table.length); - size_t padding_size = (4 - (table.length & 3)) & 3; - if (table.offset + table.length + padding_size < padding_size || - dst_size < table.offset + table.length + padding_size) { - return FONT_COMPRESSION_FAILURE(); - } - memset(dst + table.offset + table.length, 0, padding_size); - } - return true; -} - -bool WriteFont(const Font& font, size_t* offset, uint8_t* dst, - size_t dst_size) { - if (dst_size < 12ULL + 16ULL * font.num_tables) { - return FONT_COMPRESSION_FAILURE(); - } - StoreU32(font.flavor, offset, dst); - Store16(font.num_tables, offset, dst); - uint16_t max_pow2 = font.num_tables ? Log2Floor(font.num_tables) : 0; - uint16_t search_range = max_pow2 ? 1 << (max_pow2 + 4) : 0; - uint16_t range_shift = (font.num_tables << 4) - search_range; - Store16(search_range, offset, dst); - Store16(max_pow2, offset, dst); - Store16(range_shift, offset, dst); - - for (const auto& i : font.tables) { - if (!WriteTable(i.second, offset, dst, dst_size)) { - return false; - } - } - - return true; -} - -bool WriteFontCollection(const FontCollection& font_collection, uint8_t* dst, - size_t dst_size) { - size_t offset = 0; - - // It's simpler if this just a simple sfnt - if (font_collection.flavor != kTtcFontFlavor) { - return WriteFont(font_collection.fonts[0], &offset, dst, dst_size); - } - - // Write TTC header - StoreU32(kTtcFontFlavor, &offset, dst); - StoreU32(font_collection.header_version, &offset, dst); - StoreU32(font_collection.fonts.size(), &offset, dst); - - // Offset Table, zeroed for now - size_t offset_table = offset; // where to write offsets later - for (size_t i = 0; i < font_collection.fonts.size(); i++) { - StoreU32(0, &offset, dst); - } - - if (font_collection.header_version == 0x00020000) { - StoreU32(0, &offset, dst); // ulDsigTag - StoreU32(0, &offset, dst); // ulDsigLength - StoreU32(0, &offset, dst); // ulDsigOffset - } - - // Write fonts and their offsets. - for (size_t i = 0; i < font_collection.fonts.size(); i++) { - const auto& font = font_collection.fonts[i]; - StoreU32(offset, &offset_table, dst); - if (!WriteFont(font, &offset, dst, dst_size)) { - return false; - } - } - - return true; -} - -int NumGlyphs(const Font& font) { - const Font::Table* head_table = font.FindTable(kHeadTableTag); - const Font::Table* loca_table = font.FindTable(kLocaTableTag); - if (head_table == NULL || loca_table == NULL || head_table->length < 52) { - return 0; - } - int index_fmt = IndexFormat(font); - uint32_t loca_record_size = (index_fmt == 0 ? 2 : 4); - if (loca_table->length < loca_record_size) { - return 0; - } - return (loca_table->length / loca_record_size) - 1; -} - -int IndexFormat(const Font& font) { - const Font::Table* head_table = font.FindTable(kHeadTableTag); - if (head_table == NULL) { - return 0; - } - return head_table->data[51]; -} - -bool Font::Table::IsReused() const { - return this->reuse_of != NULL; -} - -bool GetGlyphData(const Font& font, int glyph_index, - const uint8_t** glyph_data, size_t* glyph_size) { - if (glyph_index < 0) { - return FONT_COMPRESSION_FAILURE(); - } - const Font::Table* head_table = font.FindTable(kHeadTableTag); - const Font::Table* loca_table = font.FindTable(kLocaTableTag); - const Font::Table* glyf_table = font.FindTable(kGlyfTableTag); - if (head_table == NULL || loca_table == NULL || glyf_table == NULL || - head_table->length < 52) { - return FONT_COMPRESSION_FAILURE(); - } - - int index_fmt = IndexFormat(font); - - Buffer loca_buf(loca_table->data, loca_table->length); - if (index_fmt == 0) { - uint16_t offset1, offset2; - if (!loca_buf.Skip(2 * glyph_index) || - !loca_buf.ReadU16(&offset1) || - !loca_buf.ReadU16(&offset2) || - offset2 < offset1 || - 2 * offset2 > glyf_table->length) { - return FONT_COMPRESSION_FAILURE(); - } - *glyph_data = glyf_table->data + 2 * offset1; - *glyph_size = 2 * (offset2 - offset1); - } else { - uint32_t offset1, offset2; - if (!loca_buf.Skip(4 * glyph_index) || - !loca_buf.ReadU32(&offset1) || - !loca_buf.ReadU32(&offset2) || - offset2 < offset1 || - offset2 > glyf_table->length) { - return FONT_COMPRESSION_FAILURE(); - } - *glyph_data = glyf_table->data + offset1; - *glyph_size = offset2 - offset1; - } - return true; -} - -bool RemoveDigitalSignature(Font* font) { - std::map<uint32_t, Font::Table>::iterator it = - font->tables.find(kDsigTableTag); - if (it != font->tables.end()) { - font->tables.erase(it); - font->num_tables = font->tables.size(); - } - return true; -} - -} // namespace woff2 |