unsigned SharedBuffer::getSomeData(const char*& someData, unsigned position) const
{
unsigned totalSize = size();
if (position >= totalSize) {
someData = 0;
return 0;
}
#if ENABLE(DISK_IMAGE_CACHE)
ASSERT(position < size());
if (isMemoryMapped()) {
const char* data = static_cast<const char*>(diskImageCache().dataForItem(m_diskImageCacheId));
someData = data + position;
return size() - position;
}
#endif
if (hasPlatformData() || m_purgeableBuffer) {
ASSERT_WITH_SECURITY_IMPLICATION(position < size());
someData = data() + position;
return totalSize - position;
}
ASSERT_WITH_SECURITY_IMPLICATION(position < m_size);
unsigned consecutiveSize = m_buffer->data.size();
if (position < consecutiveSize) {
someData = m_buffer->data.data() + position;
return consecutiveSize - position;
}
position -= consecutiveSize;
#if !USE(NETWORK_CFDATA_ARRAY_CALLBACK)
unsigned segments = m_segments.size();
unsigned maxSegmentedSize = segments * segmentSize;
unsigned segment = segmentIndex(position);
if (segment < segments) {
unsigned bytesLeft = totalSize - consecutiveSize;
unsigned segmentedSize = std::min(maxSegmentedSize, bytesLeft);
unsigned positionInSegment = offsetInSegment(position);
someData = m_segments[segment] + positionInSegment;
return segment == segments - 1 ? segmentedSize - position : segmentSize - positionInSegment;
}
ASSERT_NOT_REACHED();
return 0;
#else
return copySomeDataFromDataArray(someData, position);
#endif
}
unsigned SharedBuffer::getSomeData(const char*& someData, unsigned position) const
{
unsigned totalSize = size();
if (position >= totalSize) {
someData = 0;
return 0;
}
if (hasPlatformData() || m_purgeableBuffer) {
ASSERT(position < size());
someData = data() + position;
return totalSize - position;
}
ASSERT(position < m_size);
unsigned consecutiveSize = m_buffer.size();
if (position < consecutiveSize) {
someData = m_buffer.data() + position;
return consecutiveSize - position;
}
position -= consecutiveSize;
unsigned segments = m_segments.size();
unsigned maxSegmentedSize = segments * segmentSize;
unsigned segment = segmentIndex(position);
if (segment < segments) {
unsigned bytesLeft = totalSize - consecutiveSize;
unsigned segmentedSize = min(maxSegmentedSize, bytesLeft);
unsigned positionInSegment = offsetInSegment(position);
someData = m_segments[segment] + positionInSegment;
return segment == segments - 1 ? segmentedSize - position : segmentSize - positionInSegment;
}
#if HAVE(NETWORK_CFDATA_ARRAY_CALLBACK)
ASSERT(maxSegmentedSize <= position);
position -= maxSegmentedSize;
return copySomeDataFromDataArray(someData, position);
#else
ASSERT_NOT_REACHED();
return 0;
#endif
}
unsigned SharedBuffer::getSomeData(const char*& someData, unsigned position) const
{
unsigned totalSize = size();
if (position >= totalSize) {
someData = 0;
return 0;
}
if (hasPlatformData()) {
ASSERT_WITH_SECURITY_IMPLICATION(position < size());
someData = data() + position;
return totalSize - position;
}
ASSERT_WITH_SECURITY_IMPLICATION(position < m_size);
unsigned consecutiveSize = m_buffer->data.size();
if (position < consecutiveSize) {
someData = m_buffer->data.data() + position;
return consecutiveSize - position;
}
position -= consecutiveSize;
#if !USE(NETWORK_CFDATA_ARRAY_CALLBACK)
unsigned segments = m_segments.size();
unsigned maxSegmentedSize = segments * segmentSize;
unsigned segment = segmentIndex(position);
if (segment < segments) {
unsigned bytesLeft = totalSize - consecutiveSize;
unsigned segmentedSize = std::min(maxSegmentedSize, bytesLeft);
unsigned positionInSegment = offsetInSegment(position);
someData = m_segments[segment] + positionInSegment;
return segment == segments - 1 ? segmentedSize - position : segmentSize - positionInSegment;
}
ASSERT_NOT_REACHED();
return 0;
#else
return copySomeDataFromDataArray(someData, position);
#endif
}
