tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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vvar.cc (2849B)

      1 // Copyright (c) 2018 The OTS Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "vvar.h"
      6 
      7 #include "variations.h"
      8 
      9 namespace ots {
     10 
     11 // -----------------------------------------------------------------------------
     12 // OpenTypeVVAR
     13 // -----------------------------------------------------------------------------
     14 
     15 bool OpenTypeVVAR::Parse(const uint8_t* data, size_t length) {
     16  Buffer table(data, length);
     17 
     18  uint16_t majorVersion;
     19  uint16_t minorVersion;
     20  uint32_t itemVariationStoreOffset;
     21  uint32_t advanceHeightMappingOffset;
     22  uint32_t tsbMappingOffset;
     23  uint32_t bsbMappingOffset;
     24  uint32_t vOrgMappingOffset;
     25 
     26  if (!table.ReadU16(&majorVersion) ||
     27      !table.ReadU16(&minorVersion) ||
     28      !table.ReadU32(&itemVariationStoreOffset) ||
     29      !table.ReadU32(&advanceHeightMappingOffset) ||
     30      !table.ReadU32(&tsbMappingOffset) ||
     31      !table.ReadU32(&bsbMappingOffset) ||
     32      !table.ReadU32(&vOrgMappingOffset)) {
     33    return DropVariations("Failed to read table header");
     34  }
     35 
     36  if (majorVersion != 1) {
     37    return DropVariations("Unknown table version");
     38  }
     39 
     40  if (itemVariationStoreOffset > length ||
     41      advanceHeightMappingOffset > length ||
     42      tsbMappingOffset > length ||
     43      bsbMappingOffset > length ||
     44      vOrgMappingOffset > length) {
     45    return DropVariations("Invalid subtable offset");
     46  }
     47 
     48  if (!ParseItemVariationStore(GetFont(), data + itemVariationStoreOffset,
     49                               length - itemVariationStoreOffset)) {
     50    return DropVariations("Failed to parse item variation store");
     51  }
     52 
     53  if (advanceHeightMappingOffset) {
     54    if (!ParseDeltaSetIndexMap(GetFont(), data + advanceHeightMappingOffset,
     55                               length - advanceHeightMappingOffset)) {
     56      return DropVariations("Failed to parse advance height mappings");
     57    }
     58  }
     59 
     60  if (tsbMappingOffset) {
     61    if (!ParseDeltaSetIndexMap(GetFont(), data + tsbMappingOffset,
     62                               length - tsbMappingOffset)) {
     63      return DropVariations("Failed to parse TSB mappings");
     64    }
     65  }
     66 
     67  if (bsbMappingOffset) {
     68    if (!ParseDeltaSetIndexMap(GetFont(), data + bsbMappingOffset,
     69                               length - bsbMappingOffset)) {
     70      return DropVariations("Failed to parse BSB mappings");
     71    }
     72  }
     73 
     74  if (vOrgMappingOffset) {
     75    if (!ParseDeltaSetIndexMap(GetFont(), data + vOrgMappingOffset,
     76                               length - vOrgMappingOffset)) {
     77      return DropVariations("Failed to parse vOrg mappings");
     78    }
     79  }
     80 
     81  this->m_data = data;
     82  this->m_length = length;
     83 
     84  return true;
     85 }
     86 
     87 bool OpenTypeVVAR::Serialize(OTSStream* out) {
     88  if (!out->Write(this->m_data, this->m_length)) {
     89    return Error("Failed to write VVAR table");
     90  }
     91 
     92  return true;
     93 }
     94 
     95 }  // namespace ots