1 /** @file
2 LZMA Decompress interfaces
3
4 Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15 #include "LzmaDecompressLibInternal.h"
16 #include "Sdk/C/7zTypes.h"
17 #include "Sdk/C/7zVersion.h"
18 #include "Sdk/C/LzmaDec.h"
19
20 #define SCRATCH_BUFFER_REQUEST_SIZE SIZE_64KB
21
22 typedef struct
23 {
24 ISzAlloc Functions;
25 VOID *Buffer;
26 UINTN BufferSize;
27 } ISzAllocWithData;
28
29 /**
30 Allocation routine used by LZMA decompression.
31
32 @param P Pointer to the ISzAlloc instance
33 @param Size The size in bytes to be allocated
34
35 @return The allocated pointer address, or NULL on failure
36 **/
37 VOID *
SzAlloc(VOID * P,size_t Size)38 SzAlloc (
39 VOID *P,
40 size_t Size
41 )
42 {
43 VOID *Addr;
44 ISzAllocWithData *Private;
45
46 Private = (ISzAllocWithData*) P;
47
48 if (Private->BufferSize >= Size) {
49 Addr = Private->Buffer;
50 Private->Buffer = (VOID*) ((UINT8*)Addr + Size);
51 Private->BufferSize -= Size;
52 return Addr;
53 } else {
54 ASSERT (FALSE);
55 return NULL;
56 }
57 }
58
59 /**
60 Free routine used by LZMA decompression.
61
62 @param P Pointer to the ISzAlloc instance
63 @param Address The address to be freed
64 **/
65 VOID
SzFree(VOID * P,VOID * Address)66 SzFree (
67 VOID *P,
68 VOID *Address
69 )
70 {
71 //
72 // We use the 'scratch buffer' for allocations, so there is no free
73 // operation required. The scratch buffer will be freed by the caller
74 // of the decompression code.
75 //
76 }
77
78 #define LZMA_HEADER_SIZE (LZMA_PROPS_SIZE + 8)
79
80 /**
81 Get the size of the uncompressed buffer by parsing EncodeData header.
82
83 @param EncodedData Pointer to the compressed data.
84
85 @return The size of the uncompressed buffer.
86 **/
87 UINT64
GetDecodedSizeOfBuf(UINT8 * EncodedData)88 GetDecodedSizeOfBuf(
89 UINT8 *EncodedData
90 )
91 {
92 UINT64 DecodedSize;
93 INTN Index;
94
95 /* Parse header */
96 DecodedSize = 0;
97 for (Index = LZMA_PROPS_SIZE + 7; Index >= LZMA_PROPS_SIZE; Index--)
98 DecodedSize = LShiftU64(DecodedSize, 8) + EncodedData[Index];
99
100 return DecodedSize;
101 }
102
103 //
104 // LZMA functions and data as defined in local LzmaDecompressLibInternal.h
105 //
106
107 /**
108 Given a Lzma compressed source buffer, this function retrieves the size of
109 the uncompressed buffer and the size of the scratch buffer required
110 to decompress the compressed source buffer.
111
112 Retrieves the size of the uncompressed buffer and the temporary scratch buffer
113 required to decompress the buffer specified by Source and SourceSize.
114 The size of the uncompressed buffer is returned in DestinationSize,
115 the size of the scratch buffer is returned in ScratchSize, and RETURN_SUCCESS is returned.
116 This function does not have scratch buffer available to perform a thorough
117 checking of the validity of the source data. It just retrieves the "Original Size"
118 field from the LZMA_HEADER_SIZE beginning bytes of the source data and output it as DestinationSize.
119 And ScratchSize is specific to the decompression implementation.
120
121 If SourceSize is less than LZMA_HEADER_SIZE, then ASSERT().
122
123 @param Source The source buffer containing the compressed data.
124 @param SourceSize The size, in bytes, of the source buffer.
125 @param DestinationSize A pointer to the size, in bytes, of the uncompressed buffer
126 that will be generated when the compressed buffer specified
127 by Source and SourceSize is decompressed.
128 @param ScratchSize A pointer to the size, in bytes, of the scratch buffer that
129 is required to decompress the compressed buffer specified
130 by Source and SourceSize.
131
132 @retval RETURN_SUCCESS The size of the uncompressed data was returned
133 in DestinationSize and the size of the scratch
134 buffer was returned in ScratchSize.
135
136 **/
137 RETURN_STATUS
138 EFIAPI
LzmaUefiDecompressGetInfo(IN CONST VOID * Source,IN UINT32 SourceSize,OUT UINT32 * DestinationSize,OUT UINT32 * ScratchSize)139 LzmaUefiDecompressGetInfo (
140 IN CONST VOID *Source,
141 IN UINT32 SourceSize,
142 OUT UINT32 *DestinationSize,
143 OUT UINT32 *ScratchSize
144 )
145 {
146 UInt64 DecodedSize;
147
148 ASSERT(SourceSize >= LZMA_HEADER_SIZE);
149
150 DecodedSize = GetDecodedSizeOfBuf((UINT8*)Source);
151
152 *DestinationSize = (UINT32)DecodedSize;
153 *ScratchSize = SCRATCH_BUFFER_REQUEST_SIZE;
154 return RETURN_SUCCESS;
155 }
156
157 /**
158 Decompresses a Lzma compressed source buffer.
159
160 Extracts decompressed data to its original form.
161 If the compressed source data specified by Source is successfully decompressed
162 into Destination, then RETURN_SUCCESS is returned. If the compressed source data
163 specified by Source is not in a valid compressed data format,
164 then RETURN_INVALID_PARAMETER is returned.
165
166 @param Source The source buffer containing the compressed data.
167 @param SourceSize The size of source buffer.
168 @param Destination The destination buffer to store the decompressed data
169 @param Scratch A temporary scratch buffer that is used to perform the decompression.
170 This is an optional parameter that may be NULL if the
171 required scratch buffer size is 0.
172
173 @retval RETURN_SUCCESS Decompression completed successfully, and
174 the uncompressed buffer is returned in Destination.
175 @retval RETURN_INVALID_PARAMETER
176 The source buffer specified by Source is corrupted
177 (not in a valid compressed format).
178 **/
179 RETURN_STATUS
180 EFIAPI
LzmaUefiDecompress(IN CONST VOID * Source,IN UINTN SourceSize,IN OUT VOID * Destination,IN OUT VOID * Scratch)181 LzmaUefiDecompress (
182 IN CONST VOID *Source,
183 IN UINTN SourceSize,
184 IN OUT VOID *Destination,
185 IN OUT VOID *Scratch
186 )
187 {
188 SRes LzmaResult;
189 ELzmaStatus Status;
190 SizeT DecodedBufSize;
191 SizeT EncodedDataSize;
192 ISzAllocWithData AllocFuncs;
193
194 AllocFuncs.Functions.Alloc = SzAlloc;
195 AllocFuncs.Functions.Free = SzFree;
196 AllocFuncs.Buffer = Scratch;
197 AllocFuncs.BufferSize = SCRATCH_BUFFER_REQUEST_SIZE;
198
199 DecodedBufSize = (SizeT)GetDecodedSizeOfBuf((UINT8*)Source);
200 EncodedDataSize = (SizeT) (SourceSize - LZMA_HEADER_SIZE);
201
202 LzmaResult = LzmaDecode(
203 Destination,
204 &DecodedBufSize,
205 (Byte*)((UINT8*)Source + LZMA_HEADER_SIZE),
206 &EncodedDataSize,
207 Source,
208 LZMA_PROPS_SIZE,
209 LZMA_FINISH_END,
210 &Status,
211 &(AllocFuncs.Functions)
212 );
213
214 if (LzmaResult == SZ_OK) {
215 return RETURN_SUCCESS;
216 } else {
217 return RETURN_INVALID_PARAMETER;
218 }
219 }
220
221