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32 #include "platform/fonts/opentype/OpenTypeSanitizer.h"
34 #include "platform/RuntimeEnabledFeatures.h"
35 #include "platform/SharedBuffer.h"
36 #include "opentype-sanitiser.h"
37 #include "ots-memory-stream.h"
41 PassRefPtr<SharedBuffer> OpenTypeSanitizer::sanitize()
46 // This is the largest web font size which we'll try to transcode.
47 static const size_t maxWebFontSize = 30 * 1024 * 1024; // 30 MB
48 if (m_buffer->size() > maxWebFontSize)
51 if (RuntimeEnabledFeatures::woff2Enabled())
54 // A transcoded font is usually smaller than an original font.
55 // However, it can be slightly bigger than the original one due to
56 // name table replacement and/or padding for glyf table.
58 // With WOFF fonts, however, we'll be decompressing, so the result can be
59 // much larger than the original.
61 ots::ExpandingMemoryStream output(m_buffer->size(), maxWebFontSize);
62 if (!ots::Process(&output, reinterpret_cast<const uint8_t*>(m_buffer->data()), m_buffer->size()))
65 const size_t transcodeLen = output.Tell();
66 return SharedBuffer::create(static_cast<unsigned char*>(output.get()), transcodeLen);
69 bool OpenTypeSanitizer::supportsFormat(const String& format)
71 return equalIgnoringCase(format, "woff")
72 || (RuntimeEnabledFeatures::woff2Enabled() && equalIgnoringCase(format, "woff2"));