1 /*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #if ENABLE(OPENTYPE_SANITIZER)
33 #include "OpenTypeSanitizer.h"
34
35 #include "SharedBuffer.h"
36 #include "opentype-sanitiser.h"
37 #include "ots-memory-stream.h"
38 #include <wtf/OwnArrayPtr.h>
39
40 namespace WebCore {
41
sanitize()42 PassRefPtr<SharedBuffer> OpenTypeSanitizer::sanitize()
43 {
44 if (!m_buffer)
45 return 0;
46
47 // This is the largest web font size which we'll try to transcode.
48 static const size_t maxWebFontSize = 30 * 1024 * 1024; // 30 MB
49 if (m_buffer->size() > maxWebFontSize)
50 return 0;
51
52 // A transcoded font is usually smaller than an original font.
53 // However, it can be slightly bigger than the original one due to
54 // name table replacement and/or padding for glyf table.
55 //
56 // With WOFF fonts, however, we'll be decompressing, so the result can be
57 // much larger than the original.
58
59 ots::ExpandingMemoryStream output(m_buffer->size(), maxWebFontSize);
60 if (!ots::Process(&output, reinterpret_cast<const uint8_t*>(m_buffer->data()), m_buffer->size()))
61 return 0;
62
63 const size_t transcodeLen = output.Tell();
64 return SharedBuffer::create(static_cast<unsigned char*>(output.get()), transcodeLen);
65 }
66
67 } // namespace WebCore
68
69 #endif // ENABLE(OPENTYPE_SANITIZER)
70