third_party/ots/src/prep.cc

   1 // Copyright (c) 2009 The Chromium 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 "prep.h"
   6
   7 // prep - Control Value Program
   8 // http://www.microsoft.com/typography/otspec/prep.htm
   9
  10 #define TABLE_NAME "prep"
  11
  12 namespace ots {
  13
  14 bool ots_prep_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
  15   Buffer table(data, length);
  16
  17   OpenTypePREP *prep = new OpenTypePREP;
  18   file->prep = prep;
  19
  20   if (length >= 128 * 1024u) {
  21     return OTS_FAILURE_MSG("table length %ld > 120K", length);  // almost all prep tables are less than 9k bytes.
  22   }
  23
  24   if (!table.Skip(length)) {
  25     return OTS_FAILURE_MSG("Failed to read table of length %ld", length);
  26   }
  27
  28   prep->data = data;
  29   prep->length = length;
  30   return true;
  31 }
  32
  33 bool ots_prep_should_serialise(OpenTypeFile *file) {
  34   if (!file->glyf) return false;  // this table is not for CFF fonts.
  35   return file->prep != NULL;
  36 }
  37
  38 bool ots_prep_serialise(OTSStream *out, OpenTypeFile *file) {
  39   const OpenTypePREP *prep = file->prep;
  40
  41   if (!out->Write(prep->data, prep->length)) {
  42     return OTS_FAILURE_MSG("Failed to write table length");
  43   }
  44
  45   return true;
  46 }
  47
  48 void ots_prep_free(OpenTypeFile *file) {
  49   delete file->prep;
  50 }
  51
  52 }  // namespace ots
  53
  54 #undef TABLE_NAME