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// Archive/LzmaIn.cpp
#include "StdAfx.h"
#include "LzmaIn.h"
#include "../../Common/StreamUtils.h"
namespace NArchive {
namespace NLzma {
static bool CheckDictSize(const Byte *p)
{
UInt32 dicSize = GetUi32(p);
int i;
for (i = 1; i <= 30; i++)
if (dicSize == ((UInt32)2 << i) || dicSize == ((UInt32)3 << i))
return true;
return false;
}
HRESULT ReadStreamHeader(ISequentialInStream *inStream, CHeader &block)
{
Byte sig[5 + 9];
RINOK(ReadStream_FALSE(inStream, sig, 5 + 8));
const Byte kMaxProp0Val = 5 * 5 * 9 - 1;
if (sig[0] > kMaxProp0Val)
return S_FALSE;
for (int i = 0; i < 5; i++)
block.LzmaProps[i] = sig[i];
block.IsThereFilter = false;
block.FilterMethod = 0;
if (!CheckDictSize(sig + 1))
{
if (sig[0] > 1 || sig[1] > kMaxProp0Val)
return S_FALSE;
block.IsThereFilter = true;
block.FilterMethod = sig[0];
for (int i = 0; i < 5; i++)
block.LzmaProps[i] = sig[i + 1];
if (!CheckDictSize(block.LzmaProps + 1))
return S_FALSE;
RINOK(ReadStream_FALSE(inStream, sig + 5 + 8, 1));
}
UInt32 unpOffset = 5 + (block.IsThereFilter ? 1 : 0);
block.UnpackSize = GetUi64(sig + unpOffset);
if (block.HasUnpackSize() && block.UnpackSize >= ((UInt64)1 << 56))
return S_FALSE;
return S_OK;
}
}}
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