The Tor Browser: gfx/ots/src/vdmx.cc@6474c204b198 (annotated)

gfx/ots/src/vdmx.cc@6474c204b198 (annotated)

gfx/ots/src/vdmx.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // 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 "vdmx.h"
 // VDMX - Vertical Device Metrics
 // http://www.microsoft.com/typography/otspec/vdmx.htm
 #define TABLE_NAME "VDMX"
 #define DROP_THIS_TABLE \
   do { \
     delete file->vdmx; \
     file->vdmx = 0; \
     OTS_FAILURE_MSG("Table discarded"); \
   } while (0)
 namespace ots {
 bool ots_vdmx_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
   Buffer table(data, length);
   file->vdmx = new OpenTypeVDMX;
   OpenTypeVDMX * const vdmx = file->vdmx;
   if (!table.ReadU16(&vdmx->version) ||
       !table.ReadU16(&vdmx->num_recs) ||
       !table.ReadU16(&vdmx->num_ratios)) {
     return OTS_FAILURE_MSG("Failed to read table header");
   }
   if (vdmx->version > 1) {
     OTS_WARNING("bad version: %u", vdmx->version);
     DROP_THIS_TABLE;
     return true;  // continue transcoding
   }
   vdmx->rat_ranges.reserve(vdmx->num_ratios);
   for (unsigned i = 0; i < vdmx->num_ratios; ++i) {
     OpenTypeVDMXRatioRecord rec;
     if (!table.ReadU8(&rec.charset) ||
         !table.ReadU8(&rec.x_ratio) ||
         !table.ReadU8(&rec.y_start_ratio) ||
         !table.ReadU8(&rec.y_end_ratio)) {
       return OTS_FAILURE_MSG("Failed to read ratio header %d", i);
     }
     if (rec.charset > 1) {
       OTS_WARNING("bad charset: %u", rec.charset);
       DROP_THIS_TABLE;
       return true;
     }
     if (rec.y_start_ratio > rec.y_end_ratio) {
       OTS_WARNING("bad y ratio");
       DROP_THIS_TABLE;
       return true;
     }
     // All values set to zero signal the default grouping to use;
     // if present, this must be the last Ratio group in the table.
     if ((i < vdmx->num_ratios - 1u) &&
         (rec.x_ratio == 0) &&
         (rec.y_start_ratio == 0) &&
         (rec.y_end_ratio == 0)) {
       // workaround for fonts which have 2 or more {0, 0, 0} terminators.
       OTS_WARNING("superfluous terminator found");
       DROP_THIS_TABLE;
       return true;
     }
     vdmx->rat_ranges.push_back(rec);
   }
   vdmx->offsets.reserve(vdmx->num_ratios);
   const size_t current_offset = table.offset();
   // current_offset is less than (2 bytes * 3) + (4 bytes * USHRT_MAX) = 256k.
   for (unsigned i = 0; i < vdmx->num_ratios; ++i) {
     uint16_t offset;
     if (!table.ReadU16(&offset)) {
       return OTS_FAILURE_MSG("Failed to read ratio offset %d", i);
     }
     if (current_offset + offset >= length) {  // thus doesn't overflow.
       return OTS_FAILURE_MSG("Bad ratio offset %d for ration %d", offset, i);
     }
     vdmx->offsets.push_back(offset);
   }
   vdmx->groups.reserve(vdmx->num_recs);
   for (unsigned i = 0; i < vdmx->num_recs; ++i) {
     OpenTypeVDMXGroup group;
     if (!table.ReadU16(&group.recs) ||
         !table.ReadU8(&group.startsz) ||
         !table.ReadU8(&group.endsz)) {
       return OTS_FAILURE_MSG("Failed to read record header %d", i);
     }
     group.entries.reserve(group.recs);
     for (unsigned j = 0; j < group.recs; ++j) {
       OpenTypeVDMXVTable vt;
       if (!table.ReadU16(&vt.y_pel_height) ||
           !table.ReadS16(&vt.y_max) ||
           !table.ReadS16(&vt.y_min)) {
         return OTS_FAILURE_MSG("Failed to read reacord %d group %d", i, j);
       }
       if (vt.y_max < vt.y_min) {
         OTS_WARNING("bad y min/max");
         DROP_THIS_TABLE;
         return true;
       }
       // This table must appear in sorted order (sorted by yPelHeight),
       // but need not be continuous.
       if ((j != 0) && (group.entries[j - 1].y_pel_height >= vt.y_pel_height)) {
         OTS_WARNING("the table is not sorted");
         DROP_THIS_TABLE;
         return true;
       }
       group.entries.push_back(vt);
     }
     vdmx->groups.push_back(group);
   }
   return true;
 }
 bool ots_vdmx_should_serialise(OpenTypeFile *file) {
   if (!file->glyf) return false;  // this table is not for CFF fonts.
   return file->vdmx != NULL;
 }
 bool ots_vdmx_serialise(OTSStream *out, OpenTypeFile *file) {
   OpenTypeVDMX * const vdmx = file->vdmx;
   if (!out->WriteU16(vdmx->version) ||
       !out->WriteU16(vdmx->num_recs) ||
       !out->WriteU16(vdmx->num_ratios)) {
     return OTS_FAILURE_MSG("Failed to write table header");
   }
   for (unsigned i = 0; i < vdmx->rat_ranges.size(); ++i) {
     const OpenTypeVDMXRatioRecord& rec = vdmx->rat_ranges[i];
     if (!out->Write(&rec.charset, 1) ||
         !out->Write(&rec.x_ratio, 1) ||
         !out->Write(&rec.y_start_ratio, 1) ||
         !out->Write(&rec.y_end_ratio, 1)) {
       return OTS_FAILURE_MSG("Failed to write ratio %d", i);
     }
   }
   for (unsigned i = 0; i < vdmx->offsets.size(); ++i) {
     if (!out->WriteU16(vdmx->offsets[i])) {
       return OTS_FAILURE_MSG("Failed to write ratio offset %d", i);
     }
   }
   for (unsigned i = 0; i < vdmx->groups.size(); ++i) {
     const OpenTypeVDMXGroup& group = vdmx->groups[i];
     if (!out->WriteU16(group.recs) ||
         !out->Write(&group.startsz, 1) ||
         !out->Write(&group.endsz, 1)) {
       return OTS_FAILURE_MSG("Failed to write group %d", i);
     }
     for (unsigned j = 0; j < group.entries.size(); ++j) {
       const OpenTypeVDMXVTable& vt = group.entries[j];
       if (!out->WriteU16(vt.y_pel_height) ||
           !out->WriteS16(vt.y_max) ||
           !out->WriteS16(vt.y_min)) {
         return OTS_FAILURE_MSG("Failed to write group %d entry %d", i, j);
       }
     }
   }
   return true;
 }
 void ots_vdmx_free(OpenTypeFile *file) {
   delete file->vdmx;
 }
 }  // namespace ots

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gfx/ots/src/vdmx.cc@6474c204b198 (annotated)

gfx/ots/src/vdmx.cc