Mercurial > hg > CbC > CbC_gcc
annotate zlib/examples/zpipe.c @ 51:ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Sun, 07 Feb 2010 18:27:48 +0900 |
parents | |
children | 04ced10e8804 |
rev | line source |
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51
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1 /* zpipe.c: example of proper use of zlib's inflate() and deflate() |
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2 Not copyrighted -- provided to the public domain |
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3 Version 1.2 9 November 2004 Mark Adler */ |
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4 |
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5 /* Version history: |
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6 1.0 30 Oct 2004 First version |
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7 1.1 8 Nov 2004 Add void casting for unused return values |
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8 Use switch statement for inflate() return values |
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9 1.2 9 Nov 2004 Add assertions to document zlib guarantees |
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10 1.3 6 Apr 2005 Remove incorrect assertion in inf() |
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11 */ |
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12 |
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13 #include <stdio.h> |
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14 #include <string.h> |
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15 #include <assert.h> |
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16 #include "zlib.h" |
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17 |
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18 #define CHUNK 16384 |
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19 |
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20 /* Compress from file source to file dest until EOF on source. |
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21 def() returns Z_OK on success, Z_MEM_ERROR if memory could not be |
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22 allocated for processing, Z_STREAM_ERROR if an invalid compression |
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23 level is supplied, Z_VERSION_ERROR if the version of zlib.h and the |
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24 version of the library linked do not match, or Z_ERRNO if there is |
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25 an error reading or writing the files. */ |
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26 int def(FILE *source, FILE *dest, int level) |
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27 { |
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28 int ret, flush; |
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29 unsigned have; |
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30 z_stream strm; |
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31 char in[CHUNK]; |
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32 char out[CHUNK]; |
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33 |
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34 /* allocate deflate state */ |
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35 strm.zalloc = Z_NULL; |
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36 strm.zfree = Z_NULL; |
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37 strm.opaque = Z_NULL; |
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38 ret = deflateInit(&strm, level); |
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39 if (ret != Z_OK) |
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40 return ret; |
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41 |
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42 /* compress until end of file */ |
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43 do { |
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44 strm.avail_in = fread(in, 1, CHUNK, source); |
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45 if (ferror(source)) { |
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46 (void)deflateEnd(&strm); |
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47 return Z_ERRNO; |
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48 } |
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49 flush = feof(source) ? Z_FINISH : Z_NO_FLUSH; |
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50 strm.next_in = in; |
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51 |
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52 /* run deflate() on input until output buffer not full, finish |
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53 compression if all of source has been read in */ |
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54 do { |
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55 strm.avail_out = CHUNK; |
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56 strm.next_out = out; |
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57 ret = deflate(&strm, flush); /* no bad return value */ |
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58 assert(ret != Z_STREAM_ERROR); /* state not clobbered */ |
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59 have = CHUNK - strm.avail_out; |
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60 if (fwrite(out, 1, have, dest) != have || ferror(dest)) { |
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61 (void)deflateEnd(&strm); |
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62 return Z_ERRNO; |
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63 } |
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64 } while (strm.avail_out == 0); |
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65 assert(strm.avail_in == 0); /* all input will be used */ |
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66 |
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67 /* done when last data in file processed */ |
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68 } while (flush != Z_FINISH); |
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69 assert(ret == Z_STREAM_END); /* stream will be complete */ |
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70 |
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71 /* clean up and return */ |
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72 (void)deflateEnd(&strm); |
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73 return Z_OK; |
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74 } |
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75 |
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76 /* Decompress from file source to file dest until stream ends or EOF. |
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77 inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be |
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78 allocated for processing, Z_DATA_ERROR if the deflate data is |
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79 invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and |
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80 the version of the library linked do not match, or Z_ERRNO if there |
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81 is an error reading or writing the files. */ |
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82 int inf(FILE *source, FILE *dest) |
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83 { |
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84 int ret; |
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85 unsigned have; |
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86 z_stream strm; |
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87 char in[CHUNK]; |
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88 char out[CHUNK]; |
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89 |
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90 /* allocate inflate state */ |
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91 strm.zalloc = Z_NULL; |
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92 strm.zfree = Z_NULL; |
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93 strm.opaque = Z_NULL; |
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94 strm.avail_in = 0; |
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95 strm.next_in = Z_NULL; |
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96 ret = inflateInit(&strm); |
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97 if (ret != Z_OK) |
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98 return ret; |
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99 |
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100 /* decompress until deflate stream ends or end of file */ |
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101 do { |
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102 strm.avail_in = fread(in, 1, CHUNK, source); |
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103 if (ferror(source)) { |
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104 (void)inflateEnd(&strm); |
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105 return Z_ERRNO; |
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106 } |
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diff
changeset
|
107 if (strm.avail_in == 0) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
108 break; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
109 strm.next_in = in; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
110 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
111 /* run inflate() on input until output buffer not full */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
112 do { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
113 strm.avail_out = CHUNK; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
114 strm.next_out = out; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
115 ret = inflate(&strm, Z_NO_FLUSH); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
116 assert(ret != Z_STREAM_ERROR); /* state not clobbered */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
117 switch (ret) { |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
118 case Z_NEED_DICT: |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
119 ret = Z_DATA_ERROR; /* and fall through */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
120 case Z_DATA_ERROR: |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
121 case Z_MEM_ERROR: |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
122 (void)inflateEnd(&strm); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
123 return ret; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
124 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
125 have = CHUNK - strm.avail_out; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
126 if (fwrite(out, 1, have, dest) != have || ferror(dest)) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
127 (void)inflateEnd(&strm); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
128 return Z_ERRNO; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
129 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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|
130 } while (strm.avail_out == 0); |
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parents:
diff
changeset
|
131 |
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parents:
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|
132 /* done when inflate() says it's done */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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|
133 } while (ret != Z_STREAM_END); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
134 |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
135 /* clean up and return */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
136 (void)inflateEnd(&strm); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
137 return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
138 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
139 |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
140 /* report a zlib or i/o error */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
141 void zerr(int ret) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
142 { |
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parents:
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|
143 fputs("zpipe: ", stderr); |
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parents:
diff
changeset
|
144 switch (ret) { |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
145 case Z_ERRNO: |
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parents:
diff
changeset
|
146 if (ferror(stdin)) |
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parents:
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changeset
|
147 fputs("error reading stdin\n", stderr); |
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parents:
diff
changeset
|
148 if (ferror(stdout)) |
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parents:
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changeset
|
149 fputs("error writing stdout\n", stderr); |
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parents:
diff
changeset
|
150 break; |
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parents:
diff
changeset
|
151 case Z_STREAM_ERROR: |
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parents:
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changeset
|
152 fputs("invalid compression level\n", stderr); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
153 break; |
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parents:
diff
changeset
|
154 case Z_DATA_ERROR: |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
155 fputs("invalid or incomplete deflate data\n", stderr); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
156 break; |
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parents:
diff
changeset
|
157 case Z_MEM_ERROR: |
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parents:
diff
changeset
|
158 fputs("out of memory\n", stderr); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
159 break; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
160 case Z_VERSION_ERROR: |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
161 fputs("zlib version mismatch!\n", stderr); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
162 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
163 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
164 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
165 /* compress or decompress from stdin to stdout */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
166 int main(int argc, char **argv) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
167 { |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
168 int ret; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
169 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
170 /* do compression if no arguments */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
171 if (argc == 1) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
172 ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
173 if (ret != Z_OK) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
174 zerr(ret); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
175 return ret; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
176 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
177 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
178 /* do decompression if -d specified */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
179 else if (argc == 2 && strcmp(argv[1], "-d") == 0) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
180 ret = inf(stdin, stdout); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
181 if (ret != Z_OK) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
182 zerr(ret); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
183 return ret; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
184 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
185 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
186 /* otherwise, report usage */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
187 else { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
188 fputs("zpipe usage: zpipe [-d] < source > dest\n", stderr); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
189 return 1; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
190 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
191 } |