source: thirdparty/blosc/internal-complibs/zstd-0.7.4/legacy/zstd_legacy.h @ 8ebc79b

Revision 8ebc79b, 5.0 KB checked in by Hal Finkel <hfinkel@…>, 8 years ago (diff)

Add the other internal compression libraries from blocs

  • Property mode set to 100644
RevLine 
[8ebc79b]1/*
2    zstd_legacy - decoder for legacy format
3    Header File
4    Copyright (C) 2015-2016, Yann Collet.
5
6    BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
7
8    Redistribution and use in source and binary forms, with or without
9    modification, are permitted provided that the following conditions are
10    met:
11    * Redistributions of source code must retain the above copyright
12    notice, this list of conditions and the following disclaimer.
13    * Redistributions in binary form must reproduce the above
14    copyright notice, this list of conditions and the following disclaimer
15    in the documentation and/or other materials provided with the
16    distribution.
17    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29    You can contact the author at :
30    - zstd source repository : https://github.com/Cyan4973/zstd
31    - ztsd public forum : https://groups.google.com/forum/#!forum/lz4c
32*/
33#ifndef ZSTD_LEGACY_H
34#define ZSTD_LEGACY_H
35
36#if defined (__cplusplus)
37extern "C" {
38#endif
39
40/* *************************************
41*  Includes
42***************************************/
43#include "mem.h"            /* MEM_STATIC */
44#include "error_private.h"  /* ERROR */
45#include "zstd_v01.h"
46#include "zstd_v02.h"
47#include "zstd_v03.h"
48#include "zstd_v04.h"
49#include "zstd_v05.h"
50#include "zstd_v06.h"
51
52
53/** ZSTD_isLegacy() :
54    @return : > 0 if supported by legacy decoder. 0 otherwise.
55              return value is the version.
56*/
57MEM_STATIC unsigned ZSTD_isLegacy(const void* src, size_t srcSize)
58{
59    U32 magicNumberLE;
60    if (srcSize<4) return 0;
61    magicNumberLE = MEM_readLE32(src);
62    switch(magicNumberLE)
63    {
64        case ZSTDv01_magicNumberLE:return 1;
65        case ZSTDv02_magicNumber : return 2;
66        case ZSTDv03_magicNumber : return 3;
67        case ZSTDv04_magicNumber : return 4;
68        case ZSTDv05_MAGICNUMBER : return 5;
69        case ZSTDv06_MAGICNUMBER : return 6;
70        default : return 0;
71    }
72}
73
74
75MEM_STATIC unsigned long long ZSTD_getDecompressedSize_legacy(const void* src, size_t srcSize)
76{
77    if (srcSize < 4) return 0;
78
79    {   U32 const version = ZSTD_isLegacy(src, srcSize);
80        if (version < 5) return 0;  /* no decompressed size in frame header, or not a legacy format */
81        if (version==5) {
82            ZSTDv05_parameters fParams;
83            size_t const frResult = ZSTDv05_getFrameParams(&fParams, src, srcSize);
84            if (frResult != 0) return 0;
85            return fParams.srcSize;
86        }
87        if (version==6) {
88            ZSTDv06_frameParams fParams;
89            size_t const frResult = ZSTDv06_getFrameParams(&fParams, src, srcSize);
90            if (frResult != 0) return 0;
91            return fParams.frameContentSize;
92        }
93        return 0;   /* should not be possible */
94    }
95}
96
97MEM_STATIC size_t ZSTD_decompressLegacy(
98                     void* dst, size_t dstCapacity,
99               const void* src, size_t compressedSize,
100               const void* dict,size_t dictSize)
101{
102    U32 const version = ZSTD_isLegacy(src, compressedSize);
103    switch(version)
104    {
105        case 1 :
106            return ZSTDv01_decompress(dst, dstCapacity, src, compressedSize);
107        case 2 :
108            return ZSTDv02_decompress(dst, dstCapacity, src, compressedSize);
109        case 3 :
110            return ZSTDv03_decompress(dst, dstCapacity, src, compressedSize);
111        case 4 :
112            return ZSTDv04_decompress(dst, dstCapacity, src, compressedSize);
113        case 5 :
114            {   size_t result;
115                ZSTDv05_DCtx* const zd = ZSTDv05_createDCtx();
116                if (zd==NULL) return ERROR(memory_allocation);
117                result = ZSTDv05_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
118                ZSTDv05_freeDCtx(zd);
119                return result;
120            }
121        case 6 :
122            {   size_t result;
123                ZSTDv06_DCtx* const zd = ZSTDv06_createDCtx();
124                if (zd==NULL) return ERROR(memory_allocation);
125                result = ZSTDv06_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
126                ZSTDv06_freeDCtx(zd);
127                return result;
128            }
129        default :
130            return ERROR(prefix_unknown);
131    }
132}
133
134
135
136#if defined (__cplusplus)
137}
138#endif
139
140#endif   /* ZSTD_LEGACY_H */
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