void dng_memory_stream::DoWrite (const void *data,
uint32 count,
uint64 offset)
{
DoSetLength (Max_uint64 (fMemoryStreamLength,
offset + count));
uint64 baseOffset = offset;
while (count)
{
uint32 pageIndex = (uint32) (offset / fPageSize);
uint32 pageOffset = (uint32) (offset % fPageSize);
uint32 blockCount = Min_uint32 (fPageSize - pageOffset, count);
const uint8 *sPtr = ((const uint8 *) data) + (uint32) (offset - baseOffset);
uint8 *dPtr = fPageList [pageIndex]->Buffer_uint8 () +
pageOffset;
DoCopyBytes (sPtr, dPtr, blockCount);
offset += blockCount;
count -= blockCount;
}
}
void dng_stream::Put (const void *data,
uint32 count)
{
// See if we can replace or append to the existing buffer.
uint64 endPosition = fPosition + count;
if (fBufferDirty &&
fPosition >= fBufferStart &&
fPosition <= fBufferEnd &&
endPosition <= fBufferLimit)
{
DoCopyBytes (data,
fBuffer + (uint32) (fPosition - fBufferStart),
count);
if (fBufferEnd < endPosition)
fBufferEnd = endPosition;
}
// Else we need to write to the file.
else
{
// Write existing buffer.
Flush ();
// Write large blocks unbuffered.
if (count >= fBufferSize)
{
dng_abort_sniffer::SniffForAbort (fSniffer);
DoWrite (data, count, fPosition);
}
// Start a new buffer with small blocks.
else
{
fBufferDirty = true;
fBufferStart = fPosition;
fBufferEnd = endPosition;
fBufferLimit = fBufferStart + fBufferSize;
DoCopyBytes (data,
fBuffer,
count);
}
}
fPosition = endPosition;
fLength = Max_uint64 (Length (), fPosition);
}
