/*
* Copyright (C) 2009 Google Inc. All rights reserved.
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* modification, are permitted provided that the following conditions are
* met:
*
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* in the documentation and/or other materials provided with the
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* contributors may be used to endorse or promote products derived from
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "platform/fonts/opentype/OpenTypeSanitizer.h"
#include "RuntimeEnabledFeatures.h"
#include "platform/SharedBuffer.h"
#include "opentype-sanitiser.h"
#include "ots-memory-stream.h"
namespace WebCore {
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 WebCore