| /* |
| * Copyright (C) 2009 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "platform/fonts/opentype/OpenTypeSanitizer.h" |
| |
| #include "platform/RuntimeEnabledFeatures.h" |
| #include "platform/SharedBuffer.h" |
| #include "opentype-sanitiser.h" |
| #include "ots-memory-stream.h" |
| |
| namespace blink { |
| |
| PassRefPtr<SharedBuffer> OpenTypeSanitizer::sanitize() |
| { |
| if (!m_buffer) |
| return nullptr; |
| |
| // This is the largest web font size which we'll try to transcode. |
| static const size_t maxWebFontSize = 30 * 1024 * 1024; // 30 MB |
| if (m_buffer->size() > maxWebFontSize) |
| return nullptr; |
| |
| if (RuntimeEnabledFeatures::woff2Enabled()) |
| ots::EnableWOFF2(); |
| |
| // A transcoded font is usually smaller than an original font. |
| // However, it can be slightly bigger than the original one due to |
| // name table replacement and/or padding for glyf table. |
| // |
| // With WOFF fonts, however, we'll be decompressing, so the result can be |
| // much larger than the original. |
| |
| ots::ExpandingMemoryStream output(m_buffer->size(), maxWebFontSize); |
| if (!ots::Process(&output, reinterpret_cast<const uint8_t*>(m_buffer->data()), m_buffer->size())) |
| return nullptr; |
| |
| const size_t transcodeLen = output.Tell(); |
| return SharedBuffer::create(static_cast<unsigned char*>(output.get()), transcodeLen); |
| } |
| |
| bool OpenTypeSanitizer::supportsFormat(const String& format) |
| { |
| return equalIgnoringCase(format, "woff") |
| || (RuntimeEnabledFeatures::woff2Enabled() && equalIgnoringCase(format, "woff2")); |
| } |
| |
| } // namespace blink |