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 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
