|
Chris@4
|
1 /* blast.h -- interface for blast.c
|
|
Chris@4
|
2 Copyright (C) 2003 Mark Adler
|
|
Chris@4
|
3 version 1.1, 16 Feb 2003
|
|
Chris@4
|
4
|
|
Chris@4
|
5 This software is provided 'as-is', without any express or implied
|
|
Chris@4
|
6 warranty. In no event will the author be held liable for any damages
|
|
Chris@4
|
7 arising from the use of this software.
|
|
Chris@4
|
8
|
|
Chris@4
|
9 Permission is granted to anyone to use this software for any purpose,
|
|
Chris@4
|
10 including commercial applications, and to alter it and redistribute it
|
|
Chris@4
|
11 freely, subject to the following restrictions:
|
|
Chris@4
|
12
|
|
Chris@4
|
13 1. The origin of this software must not be misrepresented; you must not
|
|
Chris@4
|
14 claim that you wrote the original software. If you use this software
|
|
Chris@4
|
15 in a product, an acknowledgment in the product documentation would be
|
|
Chris@4
|
16 appreciated but is not required.
|
|
Chris@4
|
17 2. Altered source versions must be plainly marked as such, and must not be
|
|
Chris@4
|
18 misrepresented as being the original software.
|
|
Chris@4
|
19 3. This notice may not be removed or altered from any source distribution.
|
|
Chris@4
|
20
|
|
Chris@4
|
21 Mark Adler madler@alumni.caltech.edu
|
|
Chris@4
|
22 */
|
|
Chris@4
|
23
|
|
Chris@4
|
24
|
|
Chris@4
|
25 /*
|
|
Chris@4
|
26 * blast() decompresses the PKWare Data Compression Library (DCL) compressed
|
|
Chris@4
|
27 * format. It provides the same functionality as the explode() function in
|
|
Chris@4
|
28 * that library. (Note: PKWare overused the "implode" verb, and the format
|
|
Chris@4
|
29 * used by their library implode() function is completely different and
|
|
Chris@4
|
30 * incompatible with the implode compression method supported by PKZIP.)
|
|
Chris@4
|
31 */
|
|
Chris@4
|
32
|
|
Chris@4
|
33
|
|
Chris@4
|
34 typedef unsigned (*blast_in)(void *how, unsigned char **buf);
|
|
Chris@4
|
35 typedef int (*blast_out)(void *how, unsigned char *buf, unsigned len);
|
|
Chris@4
|
36 /* Definitions for input/output functions passed to blast(). See below for
|
|
Chris@4
|
37 * what the provided functions need to do.
|
|
Chris@4
|
38 */
|
|
Chris@4
|
39
|
|
Chris@4
|
40
|
|
Chris@4
|
41 int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow);
|
|
Chris@4
|
42 /* Decompress input to output using the provided infun() and outfun() calls.
|
|
Chris@4
|
43 * On success, the return value of blast() is zero. If there is an error in
|
|
Chris@4
|
44 * the source data, i.e. it is not in the proper format, then a negative value
|
|
Chris@4
|
45 * is returned. If there is not enough input available or there is not enough
|
|
Chris@4
|
46 * output space, then a positive error is returned.
|
|
Chris@4
|
47 *
|
|
Chris@4
|
48 * The input function is invoked: len = infun(how, &buf), where buf is set by
|
|
Chris@4
|
49 * infun() to point to the input buffer, and infun() returns the number of
|
|
Chris@4
|
50 * available bytes there. If infun() returns zero, then blast() returns with
|
|
Chris@4
|
51 * an input error. (blast() only asks for input if it needs it.) inhow is for
|
|
Chris@4
|
52 * use by the application to pass an input descriptor to infun(), if desired.
|
|
Chris@4
|
53 *
|
|
Chris@4
|
54 * The output function is invoked: err = outfun(how, buf, len), where the bytes
|
|
Chris@4
|
55 * to be written are buf[0..len-1]. If err is not zero, then blast() returns
|
|
Chris@4
|
56 * with an output error. outfun() is always called with len <= 4096. outhow
|
|
Chris@4
|
57 * is for use by the application to pass an output descriptor to outfun(), if
|
|
Chris@4
|
58 * desired.
|
|
Chris@4
|
59 *
|
|
Chris@4
|
60 * The return codes are:
|
|
Chris@4
|
61 *
|
|
Chris@4
|
62 * 2: ran out of input before completing decompression
|
|
Chris@4
|
63 * 1: output error before completing decompression
|
|
Chris@4
|
64 * 0: successful decompression
|
|
Chris@4
|
65 * -1: literal flag not zero or one
|
|
Chris@4
|
66 * -2: dictionary size not in 4..6
|
|
Chris@4
|
67 * -3: distance is too far back
|
|
Chris@4
|
68 *
|
|
Chris@4
|
69 * At the bottom of blast.c is an example program that uses blast() that can be
|
|
Chris@4
|
70 * compiled to produce a command-line decompression filter by defining TEST.
|
|
Chris@4
|
71 */
|
