Mercurial > hg > CbC > CbC_gcc
annotate zlib/examples/zpipe.c @ 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 /* zpipe.c: example of proper use of zlib's inflate() and deflate() |
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2 Not copyrighted -- provided to the public domain |
111 | 3 Version 1.4 11 December 2005 Mark Adler */ |
51
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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() |
111 | 11 1.4 11 Dec 2005 Add hack to avoid MSDOS end-of-line conversions |
12 Avoid some compiler warnings for input and output buffers | |
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13 */ |
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14 |
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15 #include <stdio.h> |
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16 #include <string.h> |
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17 #include <assert.h> |
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18 #include "zlib.h" |
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19 |
111 | 20 #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__) |
21 # include <fcntl.h> | |
22 # include <io.h> | |
23 # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) | |
24 #else | |
25 # define SET_BINARY_MODE(file) | |
26 #endif | |
27 | |
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28 #define CHUNK 16384 |
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29 |
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30 /* Compress from file source to file dest until EOF on source. |
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31 def() returns Z_OK on success, Z_MEM_ERROR if memory could not be |
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32 allocated for processing, Z_STREAM_ERROR if an invalid compression |
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33 level is supplied, Z_VERSION_ERROR if the version of zlib.h and the |
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34 version of the library linked do not match, or Z_ERRNO if there is |
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35 an error reading or writing the files. */ |
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36 int def(FILE *source, FILE *dest, int level) |
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37 { |
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38 int ret, flush; |
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39 unsigned have; |
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40 z_stream strm; |
111 | 41 unsigned char in[CHUNK]; |
42 unsigned char out[CHUNK]; | |
51
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43 |
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44 /* allocate deflate state */ |
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45 strm.zalloc = Z_NULL; |
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46 strm.zfree = Z_NULL; |
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47 strm.opaque = Z_NULL; |
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48 ret = deflateInit(&strm, level); |
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49 if (ret != Z_OK) |
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50 return ret; |
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51 |
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52 /* compress until end of file */ |
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53 do { |
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54 strm.avail_in = fread(in, 1, CHUNK, source); |
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55 if (ferror(source)) { |
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56 (void)deflateEnd(&strm); |
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57 return Z_ERRNO; |
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58 } |
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59 flush = feof(source) ? Z_FINISH : Z_NO_FLUSH; |
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60 strm.next_in = in; |
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61 |
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62 /* run deflate() on input until output buffer not full, finish |
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63 compression if all of source has been read in */ |
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64 do { |
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65 strm.avail_out = CHUNK; |
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66 strm.next_out = out; |
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67 ret = deflate(&strm, flush); /* no bad return value */ |
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68 assert(ret != Z_STREAM_ERROR); /* state not clobbered */ |
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69 have = CHUNK - strm.avail_out; |
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70 if (fwrite(out, 1, have, dest) != have || ferror(dest)) { |
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71 (void)deflateEnd(&strm); |
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72 return Z_ERRNO; |
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73 } |
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74 } while (strm.avail_out == 0); |
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75 assert(strm.avail_in == 0); /* all input will be used */ |
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76 |
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77 /* done when last data in file processed */ |
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78 } while (flush != Z_FINISH); |
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79 assert(ret == Z_STREAM_END); /* stream will be complete */ |
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80 |
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81 /* clean up and return */ |
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82 (void)deflateEnd(&strm); |
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83 return Z_OK; |
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84 } |
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85 |
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86 /* Decompress from file source to file dest until stream ends or EOF. |
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87 inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be |
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88 allocated for processing, Z_DATA_ERROR if the deflate data is |
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89 invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and |
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90 the version of the library linked do not match, or Z_ERRNO if there |
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91 is an error reading or writing the files. */ |
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92 int inf(FILE *source, FILE *dest) |
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93 { |
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94 int ret; |
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95 unsigned have; |
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96 z_stream strm; |
111 | 97 unsigned char in[CHUNK]; |
98 unsigned char out[CHUNK]; | |
51
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99 |
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100 /* allocate inflate state */ |
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101 strm.zalloc = Z_NULL; |
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102 strm.zfree = Z_NULL; |
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103 strm.opaque = Z_NULL; |
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104 strm.avail_in = 0; |
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105 strm.next_in = Z_NULL; |
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106 ret = inflateInit(&strm); |
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107 if (ret != Z_OK) |
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108 return ret; |
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109 |
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110 /* decompress until deflate stream ends or end of file */ |
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111 do { |
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112 strm.avail_in = fread(in, 1, CHUNK, source); |
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113 if (ferror(source)) { |
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114 (void)inflateEnd(&strm); |
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115 return Z_ERRNO; |
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116 } |
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117 if (strm.avail_in == 0) |
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118 break; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
119 strm.next_in = in; |
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parents:
diff
changeset
|
120 |
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parents:
diff
changeset
|
121 /* run inflate() on input until output buffer not full */ |
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parents:
diff
changeset
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122 do { |
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parents:
diff
changeset
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123 strm.avail_out = CHUNK; |
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parents:
diff
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124 strm.next_out = out; |
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parents:
diff
changeset
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125 ret = inflate(&strm, Z_NO_FLUSH); |
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parents:
diff
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126 assert(ret != Z_STREAM_ERROR); /* state not clobbered */ |
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parents:
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127 switch (ret) { |
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parents:
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changeset
|
128 case Z_NEED_DICT: |
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parents:
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|
129 ret = Z_DATA_ERROR; /* and fall through */ |
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parents:
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|
130 case Z_DATA_ERROR: |
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parents:
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131 case Z_MEM_ERROR: |
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parents:
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|
132 (void)inflateEnd(&strm); |
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parents:
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|
133 return ret; |
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parents:
diff
changeset
|
134 } |
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parents:
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135 have = CHUNK - strm.avail_out; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
136 if (fwrite(out, 1, have, dest) != have || ferror(dest)) { |
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parents:
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|
137 (void)inflateEnd(&strm); |
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parents:
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|
138 return Z_ERRNO; |
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parents:
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changeset
|
139 } |
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parents:
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|
140 } while (strm.avail_out == 0); |
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parents:
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|
141 |
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parents:
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|
142 /* done when inflate() says it's done */ |
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parents:
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143 } while (ret != Z_STREAM_END); |
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parents:
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144 |
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parents:
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|
145 /* clean up and return */ |
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parents:
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146 (void)inflateEnd(&strm); |
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parents:
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147 return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR; |
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parents:
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148 } |
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parents:
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149 |
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parents:
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|
150 /* report a zlib or i/o error */ |
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parents:
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|
151 void zerr(int ret) |
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parents:
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|
152 { |
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parents:
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153 fputs("zpipe: ", stderr); |
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parents:
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154 switch (ret) { |
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parents:
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155 case Z_ERRNO: |
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parents:
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|
156 if (ferror(stdin)) |
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parents:
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157 fputs("error reading stdin\n", stderr); |
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parents:
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changeset
|
158 if (ferror(stdout)) |
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parents:
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|
159 fputs("error writing stdout\n", stderr); |
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parents:
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changeset
|
160 break; |
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parents:
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changeset
|
161 case Z_STREAM_ERROR: |
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parents:
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|
162 fputs("invalid compression level\n", stderr); |
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parents:
diff
changeset
|
163 break; |
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parents:
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changeset
|
164 case Z_DATA_ERROR: |
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parents:
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|
165 fputs("invalid or incomplete deflate data\n", stderr); |
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parents:
diff
changeset
|
166 break; |
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parents:
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changeset
|
167 case Z_MEM_ERROR: |
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parents:
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changeset
|
168 fputs("out of memory\n", stderr); |
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parents:
diff
changeset
|
169 break; |
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parents:
diff
changeset
|
170 case Z_VERSION_ERROR: |
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parents:
diff
changeset
|
171 fputs("zlib version mismatch!\n", stderr); |
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parents:
diff
changeset
|
172 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
173 } |
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parents:
diff
changeset
|
174 |
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parents:
diff
changeset
|
175 /* compress or decompress from stdin to stdout */ |
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parents:
diff
changeset
|
176 int main(int argc, char **argv) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
177 { |
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parents:
diff
changeset
|
178 int ret; |
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parents:
diff
changeset
|
179 |
111 | 180 /* avoid end-of-line conversions */ |
181 SET_BINARY_MODE(stdin); | |
182 SET_BINARY_MODE(stdout); | |
183 | |
51
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parents:
diff
changeset
|
184 /* do compression if no arguments */ |
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parents:
diff
changeset
|
185 if (argc == 1) { |
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parents:
diff
changeset
|
186 ret = def(stdin, stdout, Z_DEFAULT_COMPRESSION); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
187 if (ret != Z_OK) |
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parents:
diff
changeset
|
188 zerr(ret); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
189 return ret; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
190 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
191 |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
192 /* do decompression if -d specified */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
193 else if (argc == 2 && strcmp(argv[1], "-d") == 0) { |
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parents:
diff
changeset
|
194 ret = inf(stdin, stdout); |
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parents:
diff
changeset
|
195 if (ret != Z_OK) |
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parents:
diff
changeset
|
196 zerr(ret); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
197 return ret; |
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parents:
diff
changeset
|
198 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
199 |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
200 /* otherwise, report usage */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
201 else { |
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parents:
diff
changeset
|
202 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
|
203 return 1; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
204 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
205 } |