source: trunk/src/blosc.h @ 90

Revision 90, 4.1 KB checked in by faltet, 3 years ago (diff)

Updated date in blosc.h.
Line 
1/*********************************************************************
2  Blosc - Blocked Suffling and Compression Library
3
4  Author: Francesc Alted (faltet@pytables.org)
5
6  See LICENSES/BLOSC.txt for details about copyright and rights to use.
7**********************************************************************/
8
9
10#ifndef BLOSC_H
11#define BLOSC_H
12
13/* Version numbers */
14#define BLOSC_VERSION_MAJOR    0    /* for major interface/format changes  */
15#define BLOSC_VERSION_MINOR    9    /* for minor interface/format changes  */
16#define BLOSC_VERSION_RELEASE  1    /* for tweaks, bug-fixes, or development */
17
18#define BLOSC_VERSION_STRING   "0.9.1.dev"  /* string version.  Sync with above! */
19#define BLOSC_VERSION_DATE     "2010-05-26"      /* date version */
20
21/* The *_VERS_FORMAT should be just 1-byte long */
22#define BLOSC_VERSION_FORMAT    2   /* Blosc format version, starting at 1 */
23#define BLOSCLZ_VERSION_FORMAT  1   /* Blosclz format version, starting at 1 */
24
25/* The combined blosc and blosclz formats */
26#define BLOSC_VERSION_CFORMAT (BLOSC_VERSION_FORMAT << 8) & (BLOSCLZ_VERSION_FORMAT)
27
28
29/**
30
31  Initialize a pool of threads for compression/decompression.  If
32  `nthreads` is 1, then the serial version is chosen and a possible
33  previous existing pool is ended.  Returns the previous number of
34  threads.  If this is not called, `nthreads` is set to 1 internally.
35
36*/
37
38int blosc_set_nthreads(int nthreads);
39
40
41/**
42
43  Compress a block of data in the `src` buffer and returns the size of
44  compressed block.  The size of `src` buffer is specified by
45  `nbytes`.  There is not a minimum `src` buffer size (`nbytes`).
46
47  `clevel` is the desired compression level and must be a number
48  between 0 (no compression) and 9 (maximum compression).
49
50  `doshuffle` specifies whether the shuffle compression preconditioner
51  should be applyied or not.  0 means not applying it and 1 means
52  applying it.
53
54  `typesize` is the number of bytes for the atomic type in binary
55  `src` buffer.  This is mainly useful for the shuffle preconditioner.
56  Only a typesize > 1 will allow the shuffle to work.
57
58  The `dest` buffer must have at least the size of the `src` buffer.
59  The `src` buffer and the `dest` buffer can not overlap.
60
61  If `src` buffer is not compressible (len(`dest`) >= len(`src`)), the
62  return value is zero and you should discard the contents of the
63  `dest` buffer.
64
65  A negative return value means that an internal error happened.  This
66  should never happen.  If you see this, please report it back
67  together with the buffer data causing this and compression settings.
68
69  Compression is memory safe and guaranteed not to write the `dest`
70  buffer more than what is specified in `nbytes`.  However, it is not
71  re-entrant and not thread-safe (despite the fact that it uses
72  threads internally ;-)
73
74 */
75
76unsigned int blosc_compress(int clevel, int doshuffle, size_t typesize,
77                            size_t nbytes, const void *src, void *dest);
78
79
80/**
81
82  Decompress a block of compressed data in `src`, put the result in
83  `dest` and returns the size of the decompressed block. If error
84  occurs, e.g. the compressed data is corrupted or the output buffer
85  is not large enough, then 0 (zero) or a negative value will be
86  returned instead.
87
88  The `src` buffer and the `dest` buffer can not overlap.
89
90  Decompression is memory safe and guaranteed not to write the `dest`
91  buffer more than what is specified in `dest_size`.  However, it is
92  not re-entrant and not thread-safe (despite the fact that it uses
93  threads internally ;-)
94
95*/
96
97unsigned int blosc_decompress(const void *src, void *dest, size_t dest_size);
98
99
100/**
101
102  Free possible memory temporaries and thread resources.  Use this
103  when you are not going to use Blosc for a long while.
104
105*/
106
107void blosc_free_resources(void);
108
109
110
111/*********************************************************************
112
113  Low-level functions follows.  Use them only if you are an expert!
114
115*********************************************************************/
116
117
118/**
119
120  Force the use of a specific blocksize.  If 0, an automatic
121  blocksize will be used (the default).
122
123*/
124
125void blosc_set_blocksize(size_t blocksize);
126
127
128#endif
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