648db22b |
1 | /* |
2 | * Copyright (c) Yann Collet, Meta Platforms, Inc. and affiliates. |
3 | * All rights reserved. |
4 | * |
5 | * This source code is licensed under both the BSD-style license (found in the |
6 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
7 | * in the COPYING file in the root directory of this source tree). |
8 | * You may select, at your option, one of the above-listed licenses. |
9 | */ |
10 | |
11 | #ifndef ZSTD_V03_H_298734209782 |
12 | #define ZSTD_V03_H_298734209782 |
13 | |
14 | #if defined (__cplusplus) |
15 | extern "C" { |
16 | #endif |
17 | |
18 | /* ************************************* |
19 | * Includes |
20 | ***************************************/ |
21 | #include <stddef.h> /* size_t */ |
22 | |
23 | |
24 | /* ************************************* |
25 | * Simple one-step function |
26 | ***************************************/ |
27 | /** |
28 | ZSTDv03_decompress() : decompress ZSTD frames compliant with v0.3.x format |
29 | compressedSize : is the exact source size |
30 | maxOriginalSize : is the size of the 'dst' buffer, which must be already allocated. |
31 | It must be equal or larger than originalSize, otherwise decompression will fail. |
32 | return : the number of bytes decompressed into destination buffer (originalSize) |
33 | or an errorCode if it fails (which can be tested using ZSTDv01_isError()) |
34 | */ |
35 | size_t ZSTDv03_decompress( void* dst, size_t maxOriginalSize, |
36 | const void* src, size_t compressedSize); |
37 | |
38 | /** |
39 | ZSTDv03_findFrameSizeInfoLegacy() : get the source length and decompressed bound of a ZSTD frame compliant with v0.3.x format |
40 | srcSize : The size of the 'src' buffer, at least as large as the frame pointed to by 'src' |
41 | cSize (output parameter) : the number of bytes that would be read to decompress this frame |
42 | or an error code if it fails (which can be tested using ZSTDv01_isError()) |
43 | dBound (output parameter) : an upper-bound for the decompressed size of the data in the frame |
44 | or ZSTD_CONTENTSIZE_ERROR if an error occurs |
45 | |
46 | note : assumes `cSize` and `dBound` are _not_ NULL. |
47 | */ |
48 | void ZSTDv03_findFrameSizeInfoLegacy(const void *src, size_t srcSize, |
49 | size_t* cSize, unsigned long long* dBound); |
50 | |
51 | /** |
52 | ZSTDv03_isError() : tells if the result of ZSTDv03_decompress() is an error |
53 | */ |
54 | unsigned ZSTDv03_isError(size_t code); |
55 | |
56 | |
57 | /* ************************************* |
58 | * Advanced functions |
59 | ***************************************/ |
60 | typedef struct ZSTDv03_Dctx_s ZSTDv03_Dctx; |
61 | ZSTDv03_Dctx* ZSTDv03_createDCtx(void); |
62 | size_t ZSTDv03_freeDCtx(ZSTDv03_Dctx* dctx); |
63 | |
64 | size_t ZSTDv03_decompressDCtx(void* ctx, |
65 | void* dst, size_t maxOriginalSize, |
66 | const void* src, size_t compressedSize); |
67 | |
68 | /* ************************************* |
69 | * Streaming functions |
70 | ***************************************/ |
71 | size_t ZSTDv03_resetDCtx(ZSTDv03_Dctx* dctx); |
72 | |
73 | size_t ZSTDv03_nextSrcSizeToDecompress(ZSTDv03_Dctx* dctx); |
74 | size_t ZSTDv03_decompressContinue(ZSTDv03_Dctx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize); |
75 | /** |
76 | Use above functions alternatively. |
77 | ZSTD_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTD_decompressContinue(). |
78 | ZSTD_decompressContinue() will use previous data blocks to improve compression if they are located prior to current block. |
79 | Result is the number of bytes regenerated within 'dst'. |
80 | It can be zero, which is not an error; it just means ZSTD_decompressContinue() has decoded some header. |
81 | */ |
82 | |
83 | /* ************************************* |
84 | * Prefix - version detection |
85 | ***************************************/ |
86 | #define ZSTDv03_magicNumber 0xFD2FB523 /* v0.3 */ |
87 | |
88 | |
89 | #if defined (__cplusplus) |
90 | } |
91 | #endif |
92 | |
93 | #endif /* ZSTD_V03_H_298734209782 */ |