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1 /* blast.h -- interface for blast.c
2 Copyright (C) 2003, 2012, 2013 Mark Adler
3 version 1.3, 24 Aug 2013
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the author be held liable for any damages
7 arising from the use of this software.
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
21 Mark Adler firstname.lastname@example.org
26 * blast() decompresses the PKWare Data Compression Library (DCL) compressed
27 * format. It provides the same functionality as the explode() function in
28 * that library. (Note: PKWare overused the "implode" verb, and the format
29 * used by their library implode() function is completely different and
30 * incompatible with the implode compression method supported by PKZIP.)
32 * The binary mode for stdio functions should be used to assure that the
33 * compressed data is not corrupted when read or written. For example:
34 * fopen(..., "rb") and fopen(..., "wb").
38 typedef unsigned (*blast_in)(void *how, unsigned char **buf);
39 typedef int (*blast_out)(void *how, unsigned char *buf, unsigned len);
40 /* Definitions for input/output functions passed to blast(). See below for
41 * what the provided functions need to do.
45 int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow,
46 unsigned *left, unsigned char **in);
47 /* Decompress input to output using the provided infun() and outfun() calls.
48 * On success, the return value of blast() is zero. If there is an error in
49 * the source data, i.e. it is not in the proper format, then a negative value
50 * is returned. If there is not enough input available or there is not enough
51 * output space, then a positive error is returned.
53 * The input function is invoked: len = infun(how, &buf), where buf is set by
54 * infun() to point to the input buffer, and infun() returns the number of
55 * available bytes there. If infun() returns zero, then blast() returns with
56 * an input error. (blast() only asks for input if it needs it.) inhow is for
57 * use by the application to pass an input descriptor to infun(), if desired.
59 * If left and in are not NULL and *left is not zero when blast() is called,
60 * then the *left bytes are *in are consumed for input before infun() is used.
62 * The output function is invoked: err = outfun(how, buf, len), where the bytes
63 * to be written are buf[0..len-1]. If err is not zero, then blast() returns
64 * with an output error. outfun() is always called with len <= 4096. outhow
65 * is for use by the application to pass an output descriptor to outfun(), if
66 * desired.
68 * If there is any unused input, *left is set to the number of bytes that were
69 * read and *in points to them. Otherwise *left is set to zero and *in is set
70 * to NULL. If left or in are NULL, then they are not set.
72 * The return codes are:
74 * 2: ran out of input before completing decompression
75 * 1: output error before completing decompression
76 * 0: successful decompression
77 * -1: literal flag not zero or one
78 * -2: dictionary size not in 4..6
79 * -3: distance is too far back
81 * At the bottom of blast.c is an example program that uses blast() that can be
82 * compiled to produce a command-line decompression filter by defining TEST.