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/** @file
LZMA Decompress interfaces
Copyright (c) 2009, Intel Corporation<BR>
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,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "LzmaDecompressLibInternal.h"
#include "Sdk/C/Types.h"
#include "Sdk/C/7zVersion.h"
#include "Sdk/C/LzmaDec.h"
//
// Global data
//
CONST VOID *mSourceLastUsedWithGetInfo;
UINT32 mSizeOfLastSource;
UINT32 mDecompressedSizeForLastSource;
VOID *mScratchBuffer;
UINTN mScratchBufferSize;
#define SCRATCH_BUFFER_REQUEST_SIZE SIZE_64KB
/**
Allocation routine used by LZMA decompression.
@param P Pointer to the ISzAlloc instance
@param Size The size in bytes to be allocated
@return The allocated pointer address, or NULL on failure
**/
VOID *
SzAlloc (
VOID *P,
size_t Size
)
{
VOID *Addr;
if (mScratchBufferSize >= Size) {
Addr = mScratchBuffer;
mScratchBuffer = (VOID*) ((UINT8*)Addr + Size);
mScratchBufferSize -= Size;
return Addr;
} else {
ASSERT (FALSE);
return NULL;
}
}
/**
Free routine used by LZMA decompression.
@param P Pointer to the ISzAlloc instance
@param Address The address to be freed
**/
VOID
SzFree (
VOID *P,
VOID *Address
)
{
//
// We use the 'scratch buffer' for allocations, so there is no free
// operation required. The scratch buffer will be freed by the caller
// of the decompression code.
//
}
STATIC ISzAlloc g_Alloc = { SzAlloc, SzFree };
#define LZMA_HEADER_SIZE (LZMA_PROPS_SIZE + 8)
/**
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;
INTN 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 in 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 in DestinationSize,
the size of the scratch buffer is returned in 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, in bytes, of the source buffer.
@param DestinationSize A pointer to the size, in bytes, of the uncompressed buffer
that will be generated when the compressed buffer specified
by Source and SourceSize is decompressed.
@param ScratchSize A pointer to the size, in bytes, of the scratch buffer that
is required to decompress the compressed buffer specified
by Source and SourceSize.
@retval RETURN_SUCCESS The size of the uncompressed data was returned
in DestinationSize and the size of the scratch
buffer was returned in ScratchSize.
**/
RETURN_STATUS
EFIAPI
LzmaUefiDecompressGetInfo (
IN CONST VOID *Source,
IN UINT32 SourceSize,
OUT UINT32 *DestinationSize,
OUT UINT32 *ScratchSize
)
{
UInt64 DecodedSize;
ASSERT(SourceSize >= LZMA_HEADER_SIZE);
DecodedSize = GetDecodedSizeOfBuf((UINT8*)Source);
mSourceLastUsedWithGetInfo = Source;
mSizeOfLastSource = SourceSize;
mDecompressedSizeForLastSource = (UInt32)DecodedSize;
*DestinationSize = mDecompressedSizeForLastSource;
*ScratchSize = SCRATCH_BUFFER_REQUEST_SIZE;
return RETURN_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 in a valid compressed data format,
then RETURN_INVALID_PARAMETER is returned.
@param Source The source buffer containing the compressed data.
@param Destination The destination buffer to store the decompressed data
@param Scratch A temporary scratch buffer that is used to perform the decompression.
This is an optional parameter that may be NULL if the
required scratch buffer size is 0.
@retval RETURN_SUCCESS Decompression completed successfully, and
the uncompressed buffer is returned in Destination.
@retval RETURN_INVALID_PARAMETER
The source buffer specified by Source is corrupted
(not in a valid compressed format).
**/
RETURN_STATUS
EFIAPI
LzmaUefiDecompress (
IN CONST VOID *Source,
IN OUT VOID *Destination,
IN OUT VOID *Scratch
)
{
SRes LzmaResult;
ELzmaStatus Status;
SizeT DecodedBufSize;
SizeT EncodedDataSize;
if (Source != mSourceLastUsedWithGetInfo) {
return RETURN_INVALID_PARAMETER;
}
DecodedBufSize = (SizeT)mDecompressedSizeForLastSource;
EncodedDataSize = (SizeT)(mSizeOfLastSource - LZMA_HEADER_SIZE);
mScratchBuffer = Scratch;
mScratchBufferSize = SCRATCH_BUFFER_REQUEST_SIZE;
LzmaResult = LzmaDecode(
Destination,
&DecodedBufSize,
(Byte*)((UINT8*)Source + LZMA_HEADER_SIZE),
&EncodedDataSize,
Source,
LZMA_PROPS_SIZE,
LZMA_FINISH_END,
&Status,
&g_Alloc
);
if (LzmaResult == SZ_OK) {
return RETURN_SUCCESS;
} else {
return RETURN_INVALID_PARAMETER;
}
}
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