UEFITool/LZMA/LzmaDecompress.c
Nikolaj Schlej 262e81720c Version 0.19.0
- added support for Intel signed sections
- massages are cleaned up once again
2014-11-08 12:40:06 +01:00

160 lines
4.7 KiB
C

/* LZMA Decompress Implementation
Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHWARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
*/
#include "LzmaDecompress.h"
#include "SDK/C/Types.h"
#include "SDK/C/7zVersion.h"
#include <stdlib.h>
UINT64
EFIAPI
LShiftU64(
UINT64 Operand,
UINT32 Count
)
{
return Operand << Count;
}
static void * AllocForLzma(void *p, size_t size) { (void)p; return malloc(size); }
static void FreeForLzma(void *p, void *address) { (void)p; free(address); }
static ISzAlloc SzAllocForLzma = { &AllocForLzma, &FreeForLzma };
/*
Get the size of the uncompressed buffer by parsing EncodeData header.
@param EncodedData Pointer to the compressed data.
@return The size of the uncompressed buffer.
*/
UINT64
GetDecodedSizeOfBuf(
UINT8 *EncodedData
)
{
UINT64 DecodedSize;
INT32 Index;
// Parse header
DecodedSize = 0;
for (Index = LZMA_PROPS_SIZE + 7; Index >= LZMA_PROPS_SIZE; Index--)
DecodedSize = LShiftU64(DecodedSize, 8) + EncodedData[Index];
return DecodedSize;
}
//
// LZMA functions and data as defined local LzmaDecompressLibInternal.h
//
/*
Given a Lzma compressed source buffer, this function retrieves the size of
the uncompressed buffer and the size of the scratch buffer required
to decompress the compressed source buffer.
Retrieves the size of the uncompressed buffer and the temporary scratch buffer
required to decompress the buffer specified by Source and SourceSize.
The size of the uncompressed buffer is returned DestinationSize,
the size of the scratch buffer is returned ScratchSize, and RETURN_SUCCESS is returned.
This function does not have scratch buffer available to perform a thorough
checking of the validity of the source data. It just retrieves the "Original Size"
field from the LZMA_HEADER_SIZE beginning bytes of the source data and output it as DestinationSize.
And ScratchSize is specific to the decompression implementation.
If SourceSize is less than LZMA_HEADER_SIZE, then ASSERT().
@param Source The source buffer containing the compressed data.
@param SourceSize The size, bytes, of the source buffer.
@param DestinationSize A pointer to the size, bytes, of the uncompressed buffer
that will be generated when the compressed buffer specified
by Source and SourceSize is decompressed.
@retval EFI_SUCCESS The size of the uncompressed data was returned
DestinationSize and the size of the scratch
buffer was returned ScratchSize.
*/
INT32
EFIAPI
LzmaGetInfo(
CONST VOID *Source,
UINT32 SourceSize,
UINT32 *DestinationSize
)
{
UInt64 DecodedSize;
ASSERT(SourceSize >= LZMA_HEADER_SIZE); (void)SourceSize;
DecodedSize = GetDecodedSizeOfBuf((UINT8*)Source);
*DestinationSize = (UINT32)DecodedSize;
return ERR_SUCCESS;
}
/*
Decompresses a Lzma compressed source buffer.
Extracts decompressed data to its original form.
If the compressed source data specified by Source is successfully decompressed
into Destination, then RETURN_SUCCESS is returned. If the compressed source data
specified by Source is not a valid compressed data format,
then RETURN_INVALID_PARAMETER is returned.
@param Source The source buffer containing the compressed data.
@param SourceSize The size of source buffer.
@param Destination The destination buffer to store the decompressed data
@retval EFI_SUCCESS Decompression completed successfully, and
the uncompressed buffer is returned Destination.
@retval EFI_INVALID_PARAMETER
The source buffer specified by Source is corrupted
(not a valid compressed format).
*/
INT32
EFIAPI
LzmaDecompress(
CONST VOID *Source,
UINT32 SourceSize,
VOID *Destination
)
{
SRes LzmaResult;
ELzmaStatus Status;
SizeT DecodedBufSize;
SizeT EncodedDataSize;
DecodedBufSize = (SizeT)GetDecodedSizeOfBuf((UINT8*)Source);
EncodedDataSize = (SizeT)(SourceSize - LZMA_HEADER_SIZE);
LzmaResult = LzmaDecode(
(Byte*)Destination,
&DecodedBufSize,
(Byte*)((UINT8*)Source + LZMA_HEADER_SIZE),
&EncodedDataSize,
(CONST Byte*) Source,
LZMA_PROPS_SIZE,
LZMA_FINISH_END,
&Status,
&SzAllocForLzma
);
if (LzmaResult == SZ_OK) {
return ERR_SUCCESS;
}
else {
return ERR_INVALID_PARAMETER;
}
}