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// StreamObjects.cpp
#include "StdAfx.h"
#include "../../../C/Alloc.h"
#include "StreamObjects.h"
STDMETHODIMP CBufInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (size == 0)
return S_OK;
if (_pos > _size)
return E_FAIL;
size_t rem = _size - (size_t)_pos;
if (rem > size)
rem = (size_t)size;
memcpy(data, _data + (size_t)_pos, rem);
_pos += rem;
if (processedSize)
*processedSize = (UInt32)rem;
return S_OK;
}
STDMETHODIMP CBufInStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch(seekOrigin)
{
case STREAM_SEEK_SET: _pos = offset; break;
case STREAM_SEEK_CUR: _pos += offset; break;
case STREAM_SEEK_END: _pos = _size + offset; break;
default: return STG_E_INVALIDFUNCTION;
}
if (newPosition)
*newPosition = _pos;
return S_OK;
}
void CByteDynBuffer::Free()
{
free(_buf);
_buf = 0;
_capacity = 0;
}
bool CByteDynBuffer::EnsureCapacity(size_t cap)
{
if (cap <= _capacity)
return true;
size_t delta;
if (_capacity > 64)
delta = _capacity / 4;
else if (_capacity > 8)
delta = 16;
else
delta = 4;
cap = MyMax(_capacity + delta, cap);
Byte *buf = (Byte *)realloc(_buf, cap);
if (!buf)
return false;
_buf = buf;
_capacity = cap;
return true;
}
Byte *CDynBufSeqOutStream::GetBufPtrForWriting(size_t addSize)
{
addSize += _size;
if (addSize < _size)
return NULL;
if (!_buffer.EnsureCapacity(addSize))
return NULL;
return (Byte *)_buffer + _size;
}
void CDynBufSeqOutStream::CopyToBuffer(CByteBuffer &dest) const
{
dest.SetCapacity(_size);
memcpy((Byte *)dest, (const Byte *)_buffer, _size);
}
STDMETHODIMP CDynBufSeqOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (size == 0)
return S_OK;
Byte *buf = GetBufPtrForWriting(size);
if (!buf)
return E_OUTOFMEMORY;
memcpy(buf, data, size);
UpdateSize(size);
if (processedSize)
*processedSize = size;
return S_OK;
}
STDMETHODIMP CBufPtrSeqOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
size_t rem = _size - _pos;
if (rem > size)
rem = (size_t)size;
memcpy(_buffer + _pos, data, rem);
_pos += rem;
if (processedSize)
*processedSize = (UInt32)rem;
return (rem != 0 || size == 0) ? S_OK : E_FAIL;
}
STDMETHODIMP CSequentialOutStreamSizeCount::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 realProcessedSize;
HRESULT result = _stream->Write(data, size, &realProcessedSize);
_size += realProcessedSize;
if (processedSize)
*processedSize = realProcessedSize;
return result;
}
static const UInt64 kEmptyTag = (UInt64)(Int64)-1;
void CCachedInStream::Free()
{
MyFree(_tags);
_tags = 0;
MidFree(_data);
_data = 0;
}
bool CCachedInStream::Alloc(unsigned blockSizeLog, unsigned numBlocksLog)
{
unsigned sizeLog = blockSizeLog + numBlocksLog;
if (sizeLog >= sizeof(size_t) * 8)
return false;
size_t dataSize = (size_t)1 << sizeLog;
if (_data == 0 || dataSize != _dataSize)
{
MidFree(_data);
_data = (Byte *)MidAlloc(dataSize);
if (_data == 0)
return false;
_dataSize = dataSize;
}
if (_tags == 0 || numBlocksLog != _numBlocksLog)
{
MyFree(_tags);
_tags = (UInt64 *)MyAlloc(sizeof(UInt64) << numBlocksLog);
if (_tags == 0)
return false;
_numBlocksLog = numBlocksLog;
}
_blockSizeLog = blockSizeLog;
return true;
}
void CCachedInStream::Init(UInt64 size)
{
_size = size;
_pos = 0;
size_t numBlocks = (size_t)1 << _numBlocksLog;
for (size_t i = 0; i < numBlocks; i++)
_tags[i] = kEmptyTag;
}
STDMETHODIMP CCachedInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize)
*processedSize = 0;
if (size == 0)
return S_OK;
if (_pos > _size)
return E_FAIL;
{
UInt64 rem = _size - _pos;
if (size > rem)
size = (UInt32)rem;
}
while (size != 0)
{
UInt64 cacheTag = _pos >> _blockSizeLog;
size_t cacheIndex = (size_t)cacheTag & (((size_t)1 << _numBlocksLog) - 1);
Byte *p = _data + (cacheIndex << _blockSizeLog);
if (_tags[cacheIndex] != cacheTag)
{
UInt64 remInBlock = _size - (cacheTag << _blockSizeLog);
size_t blockSize = (size_t)1 << _blockSizeLog;
if (blockSize > remInBlock)
blockSize = (size_t)remInBlock;
RINOK(ReadBlock(cacheTag, p, blockSize));
_tags[cacheIndex] = cacheTag;
}
size_t offset = (size_t)_pos & (((size_t)1 << _blockSizeLog) - 1);
UInt32 cur = (UInt32)MyMin(((size_t)1 << _blockSizeLog) - offset, (size_t)size);
memcpy(data, p + offset, cur);
if (processedSize)
*processedSize += cur;
data = (void *)((const Byte *)data + cur);
_pos += cur;
size -= cur;
}
return S_OK;
}
STDMETHODIMP CCachedInStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch(seekOrigin)
{
case STREAM_SEEK_SET: _pos = offset; break;
case STREAM_SEEK_CUR: _pos = _pos + offset; break;
case STREAM_SEEK_END: _pos = _size + offset; break;
default: return STG_E_INVALIDFUNCTION;
}
if (newPosition != 0)
*newPosition = _pos;
return S_OK;
}
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