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-rwxr-xr-xCPP/7zip/Common/StreamObjects.cpp221
1 files changed, 221 insertions, 0 deletions
diff --git a/CPP/7zip/Common/StreamObjects.cpp b/CPP/7zip/Common/StreamObjects.cpp
new file mode 100755
index 0000000..a18f1bc
--- /dev/null
+++ b/CPP/7zip/Common/StreamObjects.cpp
@@ -0,0 +1,221 @@
+// 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(dest, _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;
+}