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230 lines
7.1 KiB
C
230 lines
7.1 KiB
C
/** @file
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LZMA Decompress interfaces
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Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "LzmaDecompressLibInternal.h"
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#include "Sdk/C/Types.h"
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#include "Sdk/C/7zVersion.h"
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#include "Sdk/C/LzmaDec.h"
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//#include "Debug.h"
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#define SCRATCH_BUFFER_REQUEST_SIZE SIZE_64KB
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typedef struct
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{
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ISzAlloc Functions;
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VOID *Buffer;
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UINTN BufferSize;
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} ISzAllocWithData;
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/**
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Allocation routine used by LZMA decompression.
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@param P Pointer to the ISzAlloc instance
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@param Size The size in bytes to be allocated
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@return The allocated pointer address, or NULL on failure
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**/
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VOID *
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SzAlloc (
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VOID *P,
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size_t Size
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)
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{
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VOID *Addr;
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ISzAllocWithData *Private;
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Private = (ISzAllocWithData*) P;
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if (Private && Private->BufferSize >= Size) {
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Addr = Private->Buffer;
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Private->Buffer = (VOID*) ((UINT8*)Addr + Size);
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Private->BufferSize -= Size;
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return Addr;
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} else {
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// ASSERT (FALSE);
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return NULL;
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}
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}
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/**
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Free routine used by LZMA decompression.
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@param P Pointer to the ISzAlloc instance
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@param Address The address to be freed
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**/
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VOID
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SzFree (
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VOID *P,
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VOID *Address
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)
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{
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//
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// We use the 'scratch buffer' for allocations, so there is no free
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// operation required. The scratch buffer will be freed by the caller
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// of the decompression code.
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//
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}
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#define LZMA_HEADER_SIZE (LZMA_PROPS_SIZE + 8)
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/**
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Get the size of the uncompressed buffer by parsing EncodeData header.
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@param EncodedData Pointer to the compressed data.
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@return The size of the uncompressed buffer.
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**/
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UINT64
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GetDecodedSizeOfBuf(
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UINT8 *EncodedData
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)
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{
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UINT64 DecodedSize;
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INTN Index;
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if (!EncodedData) {
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return 0;
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}
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/* Parse header */
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DecodedSize = 0;
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for (Index = LZMA_PROPS_SIZE + 7; Index >= LZMA_PROPS_SIZE; Index--)
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DecodedSize = LShiftU64(DecodedSize, 8) + EncodedData[Index];
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return DecodedSize;
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}
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//
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// LZMA functions and data as defined in local LzmaDecompressLibInternal.h
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//
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/**
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Given a Lzma compressed source buffer, this function retrieves the size of
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the uncompressed buffer and the size of the scratch buffer required
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to decompress the compressed source buffer.
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Retrieves the size of the uncompressed buffer and the temporary scratch buffer
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required to decompress the buffer specified by Source and SourceSize.
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The size of the uncompressed buffer is returned in DestinationSize,
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the size of the scratch buffer is returned in ScratchSize, and RETURN_SUCCESS is returned.
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This function does not have scratch buffer available to perform a thorough
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checking of the validity of the source data. It just retrieves the "Original Size"
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field from the LZMA_HEADER_SIZE beginning bytes of the source data and output it as DestinationSize.
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And ScratchSize is specific to the decompression implementation.
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If SourceSize is less than LZMA_HEADER_SIZE, then ASSERT().
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@param Source The source buffer containing the compressed data.
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@param SourceSize The size, in bytes, of the source buffer.
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@param DestinationSize A pointer to the size, in bytes, of the uncompressed buffer
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that will be generated when the compressed buffer specified
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by Source and SourceSize is decompressed.
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@param ScratchSize A pointer to the size, in bytes, of the scratch buffer that
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is required to decompress the compressed buffer specified
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by Source and SourceSize.
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@retval RETURN_SUCCESS The size of the uncompressed data was returned
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in DestinationSize and the size of the scratch
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buffer was returned in ScratchSize.
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**/
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RETURN_STATUS
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EFIAPI
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LzmaUefiDecompressGetInfo (
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IN CONST VOID *Source,
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IN UINT32 SourceSize,
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OUT UINT32 *DestinationSize,
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OUT UINT32 *ScratchSize
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)
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{
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UInt64 DecodedSize;
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// ASSERT(SourceSize >= LZMA_HEADER_SIZE);
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if (!Source || SourceSize < LZMA_HEADER_SIZE) {
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return RETURN_INVALID_PARAMETER;
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}
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DecodedSize = GetDecodedSizeOfBuf((UINT8*)Source);
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*DestinationSize = (UINT32)DecodedSize;
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*ScratchSize = SCRATCH_BUFFER_REQUEST_SIZE;
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return RETURN_SUCCESS;
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}
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/**
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Decompresses a Lzma compressed source buffer.
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Extracts decompressed data to its original form.
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If the compressed source data specified by Source is successfully decompressed
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into Destination, then RETURN_SUCCESS is returned. If the compressed source data
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specified by Source is not in a valid compressed data format,
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then RETURN_INVALID_PARAMETER is returned.
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@param Source The source buffer containing the compressed data.
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@param SourceSize The size of source buffer.
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@param Destination The destination buffer to store the decompressed data
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@param Scratch A temporary scratch buffer that is used to perform the decompression.
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This is an optional parameter that may be NULL if the
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required scratch buffer size is 0.
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@retval RETURN_SUCCESS Decompression completed successfully, and
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the uncompressed buffer is returned in Destination.
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@retval RETURN_INVALID_PARAMETER
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The source buffer specified by Source is corrupted
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(not in a valid compressed format).
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**/
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RETURN_STATUS
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EFIAPI
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LzmaUefiDecompress (
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IN CONST VOID *Source,
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IN UINTN SourceSize,
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IN OUT VOID *Destination,
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IN OUT VOID *Scratch
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)
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{
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SRes LzmaResult;
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ELzmaStatus Status;
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SizeT DecodedBufSize;
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SizeT EncodedDataSize;
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ISzAllocWithData AllocFuncs;
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AllocFuncs.Functions.Alloc = SzAlloc;
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AllocFuncs.Functions.Free = SzFree;
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AllocFuncs.Buffer = Scratch;
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AllocFuncs.BufferSize = SCRATCH_BUFFER_REQUEST_SIZE;
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DecodedBufSize = (SizeT)GetDecodedSizeOfBuf((UINT8*)Source);
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EncodedDataSize = (SizeT) (SourceSize - LZMA_HEADER_SIZE);
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// PrintString ("DecodedBufSize = %x EncodedDataSize = %x\n", DecodedBufSize, EncodedDataSize);
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LzmaResult = LzmaDecode(
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Destination,
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&DecodedBufSize,
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(Byte*)((UINT8*)Source + LZMA_HEADER_SIZE),
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&EncodedDataSize,
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Source,
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LZMA_PROPS_SIZE,
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LZMA_FINISH_END,
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&Status,
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&(AllocFuncs.Functions)
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);
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// PrintString ("LzmaDecode OK\n");
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if (LzmaResult == SZ_OK) {
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return RETURN_SUCCESS;
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} else {
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return RETURN_INVALID_PARAMETER;
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}
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}
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