Mercurial > hg > CbC > CbC_gcc
annotate zlib/contrib/blast/blast.h @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 04ced10e8804 |
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rev | line source |
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1 /* blast.h -- interface for blast.c |
111 | 2 Copyright (C) 2003, 2012, 2013 Mark Adler |
3 version 1.3, 24 Aug 2013 | |
51
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4 |
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5 This software is provided 'as-is', without any express or implied |
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6 warranty. In no event will the author be held liable for any damages |
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7 arising from the use of this software. |
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8 |
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9 Permission is granted to anyone to use this software for any purpose, |
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10 including commercial applications, and to alter it and redistribute it |
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11 freely, subject to the following restrictions: |
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12 |
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13 1. The origin of this software must not be misrepresented; you must not |
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14 claim that you wrote the original software. If you use this software |
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15 in a product, an acknowledgment in the product documentation would be |
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16 appreciated but is not required. |
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17 2. Altered source versions must be plainly marked as such, and must not be |
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18 misrepresented as being the original software. |
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19 3. This notice may not be removed or altered from any source distribution. |
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20 |
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21 Mark Adler madler@alumni.caltech.edu |
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22 */ |
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23 |
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24 |
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25 /* |
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26 * blast() decompresses the PKWare Data Compression Library (DCL) compressed |
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27 * format. It provides the same functionality as the explode() function in |
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28 * that library. (Note: PKWare overused the "implode" verb, and the format |
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29 * used by their library implode() function is completely different and |
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30 * incompatible with the implode compression method supported by PKZIP.) |
111 | 31 * |
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"). | |
51
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35 */ |
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36 |
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37 |
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38 typedef unsigned (*blast_in)(void *how, unsigned char **buf); |
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39 typedef int (*blast_out)(void *how, unsigned char *buf, unsigned len); |
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40 /* Definitions for input/output functions passed to blast(). See below for |
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41 * what the provided functions need to do. |
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42 */ |
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43 |
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44 |
111 | 45 int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow, |
46 unsigned *left, unsigned char **in); | |
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47 /* Decompress input to output using the provided infun() and outfun() calls. |
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48 * On success, the return value of blast() is zero. If there is an error in |
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49 * the source data, i.e. it is not in the proper format, then a negative value |
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50 * is returned. If there is not enough input available or there is not enough |
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51 * output space, then a positive error is returned. |
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52 * |
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53 * The input function is invoked: len = infun(how, &buf), where buf is set by |
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54 * infun() to point to the input buffer, and infun() returns the number of |
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55 * available bytes there. If infun() returns zero, then blast() returns with |
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56 * an input error. (blast() only asks for input if it needs it.) inhow is for |
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57 * use by the application to pass an input descriptor to infun(), if desired. |
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58 * |
111 | 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. | |
61 * | |
51
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62 * The output function is invoked: err = outfun(how, buf, len), where the bytes |
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63 * to be written are buf[0..len-1]. If err is not zero, then blast() returns |
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64 * with an output error. outfun() is always called with len <= 4096. outhow |
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65 * is for use by the application to pass an output descriptor to outfun(), if |
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66 * desired. |
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67 * |
111 | 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. | |
71 * | |
51
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72 * The return codes are: |
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73 * |
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74 * 2: ran out of input before completing decompression |
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75 * 1: output error before completing decompression |
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76 * 0: successful decompression |
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77 * -1: literal flag not zero or one |
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78 * -2: dictionary size not in 4..6 |
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79 * -3: distance is too far back |
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80 * |
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81 * At the bottom of blast.c is an example program that uses blast() that can be |
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82 * compiled to produce a command-line decompression filter by defining TEST. |
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83 */ |