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/*
* Copyright (C) 2006-2016 Apple Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
* Copyright (C) 2015 Canon 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "SharedBuffer.h"
#include <algorithm>
#include <wtf/unicode/UTF8Conversion.h>
namespace WebCore {
SharedBuffer::SharedBuffer(const char* data, size_t size)
{
append(data, size);
}
SharedBuffer::SharedBuffer(const unsigned char* data, size_t size)
{
append(reinterpret_cast<const char*>(data), size);
}
SharedBuffer::SharedBuffer(FileSystem::MappedFileData&& fileData)
: m_size(fileData.size())
{
m_segments.append({0, DataSegment::create(WTFMove(fileData))});
}
SharedBuffer::SharedBuffer(Vector<char>&& data)
{
append(WTFMove(data));
}
#if USE(GSTREAMER)
Ref<SharedBuffer> SharedBuffer::create(GstMappedBuffer& mappedBuffer)
{
ASSERT(mappedBuffer.isSharable());
return adoptRef(*new SharedBuffer(mappedBuffer));
}
SharedBuffer::SharedBuffer(GstMappedBuffer& mappedBuffer)
: m_size(mappedBuffer.size())
{
m_segments.append({0, DataSegment::create(&mappedBuffer)});
}
#endif
RefPtr<SharedBuffer> SharedBuffer::createWithContentsOfFile(const String& filePath)
{
bool mappingSuccess;
FileSystem::MappedFileData mappedFileData(filePath, FileSystem::MappedFileMode::Shared, mappingSuccess);
if (!mappingSuccess)
return SharedBuffer::createFromReadingFile(filePath);
return adoptRef(new SharedBuffer(WTFMove(mappedFileData)));
}
Ref<SharedBuffer> SharedBuffer::create(Vector<char>&& vector)
{
return adoptRef(*new SharedBuffer(WTFMove(vector)));
}
// FIXME: Move the whole class from Vector<char> to Vector<uint8_t> and make this efficient, replacing the Vector<char> version above.
Ref<SharedBuffer> SharedBuffer::create(Vector<uint8_t>&& vector)
{
return adoptRef(*new SharedBuffer { vector.data(), vector.size() });
}
void SharedBuffer::combineIntoOneSegment() const
{
#if !ASSERT_DISABLED
// FIXME: We ought to be able to set this to true and have no assertions fire.
// Remove all instances of appending after calling this, because they are all O(n^2) algorithms since r215686.
// m_hasBeenCombinedIntoOneSegment = true;
#endif
if (m_segments.size() <= 1)
return;
Vector<char> combinedData;
combinedData.reserveInitialCapacity(m_size);
for (const auto& segment : m_segments)
combinedData.append(segment.segment->data(), segment.segment->size());
ASSERT(combinedData.size() == m_size);
m_segments.clear();
m_segments.append({0, DataSegment::create(WTFMove(combinedData))});
ASSERT(m_segments.size() == 1);
ASSERT(internallyConsistent());
}
const char* SharedBuffer::data() const
{
if (!m_segments.size())
return nullptr;
combineIntoOneSegment();
ASSERT(internallyConsistent());
return m_segments[0].segment->data();
}
SharedBufferDataView SharedBuffer::getSomeData(size_t position) const
{
RELEASE_ASSERT(position < m_size);
auto comparator = [](const size_t& position, const DataSegmentVectorEntry& entry) {
return position < entry.beginPosition;
};
const DataSegmentVectorEntry* element = std::upper_bound(m_segments.begin(), m_segments.end(), position, comparator);
element--; // std::upper_bound gives a pointer to the element that is greater than position. We want the element just before that.
return { element->segment.copyRef(), position - element->beginPosition };
}
RefPtr<ArrayBuffer> SharedBuffer::tryCreateArrayBuffer() const
{
auto arrayBuffer = ArrayBuffer::tryCreateUninitialized(static_cast<unsigned>(size()), sizeof(char));
if (!arrayBuffer) {
WTFLogAlways("SharedBuffer::tryCreateArrayBuffer Unable to create buffer. Requested size was %zu\n", size());
return nullptr;
}
size_t position = 0;
for (const auto& segment : m_segments) {
memcpy(static_cast<char*>(arrayBuffer->data()) + position, segment.segment->data(), segment.segment->size());
position += segment.segment->size();
}
ASSERT(position == m_size);
ASSERT(internallyConsistent());
return arrayBuffer;
}
void SharedBuffer::append(const SharedBuffer& data)
{
ASSERT(!m_hasBeenCombinedIntoOneSegment);
m_segments.reserveCapacity(m_segments.size() + data.m_segments.size());
for (const auto& element : data.m_segments) {
m_segments.uncheckedAppend({m_size, element.segment.copyRef()});
m_size += element.segment->size();
}
ASSERT(internallyConsistent());
}
void SharedBuffer::append(const char* data, size_t length)
{
ASSERT(!m_hasBeenCombinedIntoOneSegment);
Vector<char> vector;
vector.append(data, length);
m_segments.append({m_size, DataSegment::create(WTFMove(vector))});
m_size += length;
ASSERT(internallyConsistent());
}
void SharedBuffer::append(Vector<char>&& data)
{
ASSERT(!m_hasBeenCombinedIntoOneSegment);
auto dataSize = data.size();
m_segments.append({m_size, DataSegment::create(WTFMove(data))});
m_size += dataSize;
ASSERT(internallyConsistent());
}
void SharedBuffer::clear()
{
m_size = 0;
m_segments.clear();
ASSERT(internallyConsistent());
}
Ref<SharedBuffer> SharedBuffer::copy() const
{
Ref<SharedBuffer> clone = adoptRef(*new SharedBuffer);
clone->m_size = m_size;
clone->m_segments.reserveInitialCapacity(m_segments.size());
for (const auto& element : m_segments)
clone->m_segments.uncheckedAppend({element.beginPosition, element.segment.copyRef()});
ASSERT(clone->internallyConsistent());
ASSERT(internallyConsistent());
return clone;
}
#if !ASSERT_DISABLED
bool SharedBuffer::internallyConsistent() const
{
size_t position = 0;
for (const auto& element : m_segments) {
if (element.beginPosition != position)
return false;
position += element.segment->size();
}
return position == m_size;
}
#endif
const char* SharedBuffer::DataSegment::data() const
{
auto visitor = WTF::makeVisitor(
[](const Vector<char>& data) { return data.data(); },
#if USE(CF)
[](const RetainPtr<CFDataRef>& data) { return reinterpret_cast<const char*>(CFDataGetBytePtr(data.get())); },
#endif
#if USE(SOUP)
[](const GUniquePtr<SoupBuffer>& data) { return data->data; },
#endif
#if USE(GLIB)
[](const GRefPtr<GBytes>& data) { return reinterpret_cast<const char*>(g_bytes_get_data(data.get(), nullptr)); },
#endif
#if USE(GSTREAMER)
[](const RefPtr<GstMappedBuffer>& data) { return reinterpret_cast<const char*>(data->data()); },
#endif
[](const FileSystem::MappedFileData& data) { return reinterpret_cast<const char*>(data.data()); }
);
return WTF::visit(visitor, m_immutableData);
}
#if !USE(CF)
void SharedBuffer::hintMemoryNotNeededSoon() const
{
}
#endif
bool SharedBuffer::operator==(const SharedBuffer& other) const
{
if (this == &other)
return true;
if (m_size != other.m_size)
return false;
auto thisIterator = begin();
size_t thisOffset = 0;
auto otherIterator = other.begin();
size_t otherOffset = 0;
while (thisIterator != end() && otherIterator != other.end()) {
auto& thisSegment = thisIterator->segment.get();
auto& otherSegment = otherIterator->segment.get();
if (&thisSegment == &otherSegment && !thisOffset && !otherOffset) {
++thisIterator;
++otherIterator;
continue;
}
ASSERT(thisOffset < thisSegment.size());
ASSERT(otherOffset < otherSegment.size());
size_t thisRemaining = thisSegment.size() - thisOffset;
size_t otherRemaining = otherSegment.size() - otherOffset;
size_t remaining = std::min(thisRemaining, otherRemaining);
if (memcmp(thisSegment.data() + thisOffset, otherSegment.data() + otherOffset, remaining))
return false;
thisOffset += remaining;
otherOffset += remaining;
if (thisOffset == thisSegment.size()) {
++thisIterator;
thisOffset = 0;
}
if (otherOffset == otherSegment.size()) {
++otherIterator;
otherOffset = 0;
}
}
return true;
}
size_t SharedBuffer::DataSegment::size() const
{
auto visitor = WTF::makeVisitor(
[](const Vector<char>& data) { return data.size(); },
#if USE(CF)
[](const RetainPtr<CFDataRef>& data) { return CFDataGetLength(data.get()); },
#endif
#if USE(SOUP)
[](const GUniquePtr<SoupBuffer>& data) { return static_cast<size_t>(data->length); },
#endif
#if USE(GLIB)
[](const GRefPtr<GBytes>& data) { return g_bytes_get_size(data.get()); },
#endif
#if USE(GSTREAMER)
[](const RefPtr<GstMappedBuffer>& data) { return data->size(); },
#endif
[](const FileSystem::MappedFileData& data) { return data.size(); }
);
return WTF::visit(visitor, m_immutableData);
}
SharedBufferDataView::SharedBufferDataView(Ref<SharedBuffer::DataSegment>&& segment, size_t positionWithinSegment)
: m_positionWithinSegment(positionWithinSegment)
, m_segment(WTFMove(segment))
{
ASSERT(positionWithinSegment < m_segment->size());
}
size_t SharedBufferDataView::size() const
{
return m_segment->size() - m_positionWithinSegment;
}
const char* SharedBufferDataView::data() const
{
return m_segment->data() + m_positionWithinSegment;
}
RefPtr<SharedBuffer> utf8Buffer(const String& string)
{
// Allocate a buffer big enough to hold all the characters.
const int length = string.length();
Vector<char> buffer(length * 3);
// Convert to runs of 8-bit characters.
char* p = buffer.data();
if (length) {
if (string.is8Bit()) {
const LChar* d = string.characters8();
if (!WTF::Unicode::convertLatin1ToUTF8(&d, d + length, &p, p + buffer.size()))
return nullptr;
} else {
const UChar* d = string.characters16();
if (WTF::Unicode::convertUTF16ToUTF8(&d, d + length, &p, p + buffer.size()) != WTF::Unicode::ConversionOK)
return nullptr;
}
}
buffer.shrink(p - buffer.data());
return SharedBuffer::create(WTFMove(buffer));
}
} // namespace WebCore