diff options
Diffstat (limited to 'src/libs/7zip/win/CPP/7zip/Archive/Common/FindSignature.cpp')
-rw-r--r-- | src/libs/7zip/win/CPP/7zip/Archive/Common/FindSignature.cpp | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/src/libs/7zip/win/CPP/7zip/Archive/Common/FindSignature.cpp b/src/libs/7zip/win/CPP/7zip/Archive/Common/FindSignature.cpp deleted file mode 100644 index 15aa6ceae..000000000 --- a/src/libs/7zip/win/CPP/7zip/Archive/Common/FindSignature.cpp +++ /dev/null @@ -1,62 +0,0 @@ -// FindSignature.cpp - -#include "StdAfx.h" - -#include "Common/Buffer.h" - -#include "FindSignature.h" - -#include "../../Common/StreamUtils.h" - -HRESULT FindSignatureInStream(ISequentialInStream *stream, - const Byte *signature, unsigned signatureSize, - const UInt64 *limit, UInt64 &resPos) -{ - resPos = 0; - CByteBuffer byteBuffer2; - byteBuffer2.SetCapacity(signatureSize); - RINOK(ReadStream_FALSE(stream, byteBuffer2, signatureSize)); - - if (memcmp(byteBuffer2, signature, signatureSize) == 0) - return S_OK; - - const UInt32 kBufferSize = (1 << 16); - CByteBuffer byteBuffer; - byteBuffer.SetCapacity(kBufferSize); - Byte *buffer = byteBuffer; - UInt32 numPrevBytes = signatureSize - 1; - memcpy(buffer, (const Byte *)byteBuffer2 + 1, numPrevBytes); - resPos = 1; - for (;;) - { - if (limit != NULL) - if (resPos > *limit) - return S_FALSE; - do - { - UInt32 numReadBytes = kBufferSize - numPrevBytes; - UInt32 processedSize; - RINOK(stream->Read(buffer + numPrevBytes, numReadBytes, &processedSize)); - numPrevBytes += processedSize; - if (processedSize == 0) - return S_FALSE; - } - while (numPrevBytes < signatureSize); - UInt32 numTests = numPrevBytes - signatureSize + 1; - for (UInt32 pos = 0; pos < numTests; pos++) - { - Byte b = signature[0]; - for (; buffer[pos] != b && pos < numTests; pos++); - if (pos == numTests) - break; - if (memcmp(buffer + pos, signature, signatureSize) == 0) - { - resPos += pos; - return S_OK; - } - } - resPos += numTests; - numPrevBytes -= numTests; - memmove(buffer, buffer + numTests, numPrevBytes); - } -} |