The Tor Browser: gfx/ots/src/cvt.cc@6474c204b198

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

     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.

     5 #include "cvt.h"

     7 // cvt - Control Value Table

     8 // http://www.microsoft.com/typography/otspec/cvt.htm

    10 #define TABLE_NAME "cvt"

    12 namespace ots {

    14 bool ots_cvt_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {

    15   Buffer table(data, length);

    17   OpenTypeCVT *cvt = new OpenTypeCVT;

    18   file->cvt = cvt;

    20   if (length >= 128 * 1024u) {

    21     return OTS_FAILURE_MSG("Length (%d) > 120K");  // almost all cvt tables are less than 4k bytes.

    22   }

    24   if (length % 2 != 0) {

    25     return OTS_FAILURE_MSG("Uneven cvt length (%d)", length);

    26   }

    28   if (!table.Skip(length)) {

    29     return OTS_FAILURE_MSG("Length too high");

    30   }

    32   cvt->data = data;

    33   cvt->length = length;

    34   return true;

    35 }

    37 bool ots_cvt_should_serialise(OpenTypeFile *file) {

    38   if (!file->glyf) {

    39     return false;  // this table is not for CFF fonts.

    40   }

    41   return g_transcode_hints && file->cvt;

    42 }

    44 bool ots_cvt_serialise(OTSStream *out, OpenTypeFile *file) {

    45   const OpenTypeCVT *cvt = file->cvt;

    47   if (!out->Write(cvt->data, cvt->length)) {

    48     return OTS_FAILURE_MSG("Failed to write CVT table");

    49   }

    51   return true;

    52 }

    54 void ots_cvt_free(OpenTypeFile *file) {

    55   delete file->cvt;

    56 }

    58 }  // namespace ots

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