Mercurial > hg > CbC > CbC_gcc
annotate zlib/examples/gzappend.c @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | ae3a4bfb450b |
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rev | line source |
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1 /* gzappend -- command to append to a gzip file |
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2 |
111 | 3 Copyright (C) 2003, 2012 Mark Adler, all rights reserved |
4 version 1.2, 11 Oct 2012 | |
51
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5 |
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6 This software is provided 'as-is', without any express or implied |
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7 warranty. In no event will the author be held liable for any damages |
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8 arising from the use of this software. |
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9 |
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10 Permission is granted to anyone to use this software for any purpose, |
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11 including commercial applications, and to alter it and redistribute it |
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12 freely, subject to the following restrictions: |
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13 |
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14 1. The origin of this software must not be misrepresented; you must not |
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15 claim that you wrote the original software. If you use this software |
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16 in a product, an acknowledgment in the product documentation would be |
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17 appreciated but is not required. |
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18 2. Altered source versions must be plainly marked as such, and must not be |
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19 misrepresented as being the original software. |
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20 3. This notice may not be removed or altered from any source distribution. |
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21 |
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22 Mark Adler madler@alumni.caltech.edu |
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23 */ |
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24 |
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25 /* |
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26 * Change history: |
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27 * |
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28 * 1.0 19 Oct 2003 - First version |
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29 * 1.1 4 Nov 2003 - Expand and clarify some comments and notes |
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30 * - Add version and copyright to help |
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31 * - Send help to stdout instead of stderr |
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32 * - Add some preemptive typecasts |
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33 * - Add L to constants in lseek() calls |
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34 * - Remove some debugging information in error messages |
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35 * - Use new data_type definition for zlib 1.2.1 |
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36 * - Simplfy and unify file operations |
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37 * - Finish off gzip file in gztack() |
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38 * - Use deflatePrime() instead of adding empty blocks |
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39 * - Keep gzip file clean on appended file read errors |
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40 * - Use in-place rotate instead of auxiliary buffer |
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41 * (Why you ask? Because it was fun to write!) |
111 | 42 * 1.2 11 Oct 2012 - Fix for proper z_const usage |
43 * - Check for input buffer malloc failure | |
51
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44 */ |
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45 |
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46 /* |
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47 gzappend takes a gzip file and appends to it, compressing files from the |
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48 command line or data from stdin. The gzip file is written to directly, to |
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49 avoid copying that file, in case it's large. Note that this results in the |
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50 unfriendly behavior that if gzappend fails, the gzip file is corrupted. |
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51 |
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52 This program was written to illustrate the use of the new Z_BLOCK option of |
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53 zlib 1.2.x's inflate() function. This option returns from inflate() at each |
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54 block boundary to facilitate locating and modifying the last block bit at |
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55 the start of the final deflate block. Also whether using Z_BLOCK or not, |
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56 another required feature of zlib 1.2.x is that inflate() now provides the |
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57 number of unusued bits in the last input byte used. gzappend will not work |
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58 with versions of zlib earlier than 1.2.1. |
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59 |
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60 gzappend first decompresses the gzip file internally, discarding all but |
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61 the last 32K of uncompressed data, and noting the location of the last block |
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62 bit and the number of unused bits in the last byte of the compressed data. |
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63 The gzip trailer containing the CRC-32 and length of the uncompressed data |
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64 is verified. This trailer will be later overwritten. |
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65 |
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66 Then the last block bit is cleared by seeking back in the file and rewriting |
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67 the byte that contains it. Seeking forward, the last byte of the compressed |
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68 data is saved along with the number of unused bits to initialize deflate. |
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69 |
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70 A deflate process is initialized, using the last 32K of the uncompressed |
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71 data from the gzip file to initialize the dictionary. If the total |
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72 uncompressed data was less than 32K, then all of it is used to initialize |
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73 the dictionary. The deflate output bit buffer is also initialized with the |
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74 last bits from the original deflate stream. From here on, the data to |
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75 append is simply compressed using deflate, and written to the gzip file. |
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76 When that is complete, the new CRC-32 and uncompressed length are written |
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77 as the trailer of the gzip file. |
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78 */ |
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79 |
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80 #include <stdio.h> |
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81 #include <stdlib.h> |
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82 #include <string.h> |
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83 #include <fcntl.h> |
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84 #include <unistd.h> |
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85 #include "zlib.h" |
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86 |
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87 #define local static |
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88 #define LGCHUNK 14 |
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89 #define CHUNK (1U << LGCHUNK) |
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90 #define DSIZE 32768U |
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91 |
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92 /* print an error message and terminate with extreme prejudice */ |
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93 local void bye(char *msg1, char *msg2) |
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94 { |
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95 fprintf(stderr, "gzappend error: %s%s\n", msg1, msg2); |
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96 exit(1); |
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97 } |
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98 |
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99 /* return the greatest common divisor of a and b using Euclid's algorithm, |
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100 modified to be fast when one argument much greater than the other, and |
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101 coded to avoid unnecessary swapping */ |
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102 local unsigned gcd(unsigned a, unsigned b) |
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103 { |
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104 unsigned c; |
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105 |
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106 while (a && b) |
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107 if (a > b) { |
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108 c = b; |
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|
109 while (a - c >= c) |
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parents:
diff
changeset
|
110 c <<= 1; |
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parents:
diff
changeset
|
111 a -= c; |
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parents:
diff
changeset
|
112 } |
ae3a4bfb450b
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parents:
diff
changeset
|
113 else { |
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parents:
diff
changeset
|
114 c = a; |
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parents:
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|
115 while (b - c >= c) |
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parents:
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|
116 c <<= 1; |
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parents:
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|
117 b -= c; |
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parents:
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|
118 } |
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parents:
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|
119 return a + b; |
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parents:
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|
120 } |
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parents:
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|
121 |
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parents:
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|
122 /* rotate list[0..len-1] left by rot positions, in place */ |
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parents:
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|
123 local void rotate(unsigned char *list, unsigned len, unsigned rot) |
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parents:
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|
124 { |
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parents:
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|
125 unsigned char tmp; |
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parents:
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126 unsigned cycles; |
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127 unsigned char *start, *last, *to, *from; |
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parents:
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128 |
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129 /* normalize rot and handle degenerate cases */ |
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130 if (len < 2) return; |
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131 if (rot >= len) rot %= len; |
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132 if (rot == 0) return; |
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133 |
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134 /* pointer to last entry in list */ |
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135 last = list + (len - 1); |
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parents:
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|
136 |
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parents:
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|
137 /* do simple left shift by one */ |
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parents:
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|
138 if (rot == 1) { |
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parents:
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|
139 tmp = *list; |
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parents:
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|
140 memcpy(list, list + 1, len - 1); |
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parents:
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|
141 *last = tmp; |
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parents:
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|
142 return; |
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parents:
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changeset
|
143 } |
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parents:
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|
144 |
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parents:
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|
145 /* do simple right shift by one */ |
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parents:
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changeset
|
146 if (rot == len - 1) { |
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parents:
diff
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|
147 tmp = *last; |
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parents:
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changeset
|
148 memmove(list + 1, list, len - 1); |
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parents:
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|
149 *list = tmp; |
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parents:
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changeset
|
150 return; |
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parents:
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changeset
|
151 } |
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parents:
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|
152 |
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parents:
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|
153 /* otherwise do rotate as a set of cycles in place */ |
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parents:
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changeset
|
154 cycles = gcd(len, rot); /* number of cycles */ |
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parents:
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changeset
|
155 do { |
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parents:
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changeset
|
156 start = from = list + cycles; /* start index is arbitrary */ |
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parents:
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changeset
|
157 tmp = *from; /* save entry to be overwritten */ |
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parents:
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|
158 for (;;) { |
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parents:
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changeset
|
159 to = from; /* next step in cycle */ |
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parents:
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changeset
|
160 from += rot; /* go right rot positions */ |
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parents:
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changeset
|
161 if (from > last) from -= len; /* (pointer better not wrap) */ |
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parents:
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changeset
|
162 if (from == start) break; /* all but one shifted */ |
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parents:
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changeset
|
163 *to = *from; /* shift left */ |
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parents:
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changeset
|
164 } |
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parents:
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|
165 *to = tmp; /* complete the circle */ |
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parents:
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changeset
|
166 } while (--cycles); |
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parents:
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changeset
|
167 } |
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parents:
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changeset
|
168 |
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parents:
diff
changeset
|
169 /* structure for gzip file read operations */ |
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parents:
diff
changeset
|
170 typedef struct { |
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parents:
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changeset
|
171 int fd; /* file descriptor */ |
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parents:
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changeset
|
172 int size; /* 1 << size is bytes in buf */ |
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parents:
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changeset
|
173 unsigned left; /* bytes available at next */ |
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parents:
diff
changeset
|
174 unsigned char *buf; /* buffer */ |
111 | 175 z_const unsigned char *next; /* next byte in buffer */ |
51
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parents:
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changeset
|
176 char *name; /* file name for error messages */ |
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parents:
diff
changeset
|
177 } file; |
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parents:
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changeset
|
178 |
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parents:
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changeset
|
179 /* reload buffer */ |
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parents:
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changeset
|
180 local int readin(file *in) |
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parents:
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changeset
|
181 { |
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parents:
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changeset
|
182 int len; |
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parents:
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changeset
|
183 |
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parents:
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changeset
|
184 len = read(in->fd, in->buf, 1 << in->size); |
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parents:
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changeset
|
185 if (len == -1) bye("error reading ", in->name); |
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parents:
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changeset
|
186 in->left = (unsigned)len; |
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parents:
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changeset
|
187 in->next = in->buf; |
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parents:
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changeset
|
188 return len; |
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parents:
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changeset
|
189 } |
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changeset
|
190 |
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parents:
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changeset
|
191 /* read from file in, exit if end-of-file */ |
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parents:
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changeset
|
192 local int readmore(file *in) |
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parents:
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changeset
|
193 { |
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parents:
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changeset
|
194 if (readin(in) == 0) bye("unexpected end of ", in->name); |
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parents:
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changeset
|
195 return 0; |
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parents:
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changeset
|
196 } |
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parents:
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changeset
|
197 |
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changeset
|
198 #define read1(in) (in->left == 0 ? readmore(in) : 0, \ |
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parents:
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changeset
|
199 in->left--, *(in->next)++) |
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changeset
|
200 |
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parents:
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changeset
|
201 /* skip over n bytes of in */ |
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parents:
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changeset
|
202 local void skip(file *in, unsigned n) |
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parents:
diff
changeset
|
203 { |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
204 unsigned bypass; |
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parents:
diff
changeset
|
205 |
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parents:
diff
changeset
|
206 if (n > in->left) { |
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parents:
diff
changeset
|
207 n -= in->left; |
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parents:
diff
changeset
|
208 bypass = n & ~((1U << in->size) - 1); |
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parents:
diff
changeset
|
209 if (bypass) { |
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parents:
diff
changeset
|
210 if (lseek(in->fd, (off_t)bypass, SEEK_CUR) == -1) |
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parents:
diff
changeset
|
211 bye("seeking ", in->name); |
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parents:
diff
changeset
|
212 n -= bypass; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
213 } |
ae3a4bfb450b
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parents:
diff
changeset
|
214 readmore(in); |
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parents:
diff
changeset
|
215 if (n > in->left) |
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parents:
diff
changeset
|
216 bye("unexpected end of ", in->name); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
217 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
218 in->left -= n; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
219 in->next += n; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
220 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
221 |
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parents:
diff
changeset
|
222 /* read a four-byte unsigned integer, little-endian, from in */ |
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parents:
diff
changeset
|
223 unsigned long read4(file *in) |
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parents:
diff
changeset
|
224 { |
ae3a4bfb450b
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parents:
diff
changeset
|
225 unsigned long val; |
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parents:
diff
changeset
|
226 |
ae3a4bfb450b
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parents:
diff
changeset
|
227 val = read1(in); |
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parents:
diff
changeset
|
228 val += (unsigned)read1(in) << 8; |
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parents:
diff
changeset
|
229 val += (unsigned long)read1(in) << 16; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
230 val += (unsigned long)read1(in) << 24; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
231 return val; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
232 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
233 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
234 /* skip over gzip header */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
235 local void gzheader(file *in) |
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parents:
diff
changeset
|
236 { |
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parents:
diff
changeset
|
237 int flags; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
238 unsigned n; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
239 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
240 if (read1(in) != 31 || read1(in) != 139) bye(in->name, " not a gzip file"); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
241 if (read1(in) != 8) bye("unknown compression method in", in->name); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
242 flags = read1(in); |
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parents:
diff
changeset
|
243 if (flags & 0xe0) bye("unknown header flags set in", in->name); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
244 skip(in, 6); |
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parents:
diff
changeset
|
245 if (flags & 4) { |
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parents:
diff
changeset
|
246 n = read1(in); |
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parents:
diff
changeset
|
247 n += (unsigned)(read1(in)) << 8; |
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parents:
diff
changeset
|
248 skip(in, n); |
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parents:
diff
changeset
|
249 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
250 if (flags & 8) while (read1(in) != 0) ; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
251 if (flags & 16) while (read1(in) != 0) ; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
252 if (flags & 2) skip(in, 2); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
253 } |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
254 |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
255 /* decompress gzip file "name", return strm with a deflate stream ready to |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
256 continue compression of the data in the gzip file, and return a file |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
257 descriptor pointing to where to write the compressed data -- the deflate |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
258 stream is initialized to compress using level "level" */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
259 local int gzscan(char *name, z_stream *strm, int level) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
260 { |
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parents:
diff
changeset
|
261 int ret, lastbit, left, full; |
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parents:
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changeset
|
262 unsigned have; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
263 unsigned long crc, tot; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
264 unsigned char *window; |
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parents:
diff
changeset
|
265 off_t lastoff, end; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
266 file gz; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
267 |
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parents:
diff
changeset
|
268 /* open gzip file */ |
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parents:
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changeset
|
269 gz.name = name; |
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parents:
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changeset
|
270 gz.fd = open(name, O_RDWR, 0); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
271 if (gz.fd == -1) bye("cannot open ", name); |
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parents:
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changeset
|
272 gz.buf = malloc(CHUNK); |
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parents:
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changeset
|
273 if (gz.buf == NULL) bye("out of memory", ""); |
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parents:
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changeset
|
274 gz.size = LGCHUNK; |
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parents:
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changeset
|
275 gz.left = 0; |
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parents:
diff
changeset
|
276 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
277 /* skip gzip header */ |
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parents:
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changeset
|
278 gzheader(&gz); |
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parents:
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changeset
|
279 |
ae3a4bfb450b
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parents:
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changeset
|
280 /* prepare to decompress */ |
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parents:
diff
changeset
|
281 window = malloc(DSIZE); |
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parents:
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changeset
|
282 if (window == NULL) bye("out of memory", ""); |
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parents:
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changeset
|
283 strm->zalloc = Z_NULL; |
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parents:
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changeset
|
284 strm->zfree = Z_NULL; |
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parents:
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changeset
|
285 strm->opaque = Z_NULL; |
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parents:
diff
changeset
|
286 ret = inflateInit2(strm, -15); |
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parents:
diff
changeset
|
287 if (ret != Z_OK) bye("out of memory", " or library mismatch"); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
288 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
289 /* decompress the deflate stream, saving append information */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
290 lastbit = 0; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
291 lastoff = lseek(gz.fd, 0L, SEEK_CUR) - gz.left; |
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parents:
diff
changeset
|
292 left = 0; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
293 strm->avail_in = gz.left; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
294 strm->next_in = gz.next; |
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parents:
diff
changeset
|
295 crc = crc32(0L, Z_NULL, 0); |
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parents:
diff
changeset
|
296 have = full = 0; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
297 do { |
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parents:
diff
changeset
|
298 /* if needed, get more input */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
299 if (strm->avail_in == 0) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
300 readmore(&gz); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
301 strm->avail_in = gz.left; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
302 strm->next_in = gz.next; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
303 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
304 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
305 /* set up output to next available section of sliding window */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
306 strm->avail_out = DSIZE - have; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
307 strm->next_out = window + have; |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
308 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
309 /* inflate and check for errors */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
310 ret = inflate(strm, Z_BLOCK); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
311 if (ret == Z_STREAM_ERROR) bye("internal stream error!", ""); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
312 if (ret == Z_MEM_ERROR) bye("out of memory", ""); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
313 if (ret == Z_DATA_ERROR) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
314 bye("invalid compressed data--format violated in", name); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
315 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
316 /* update crc and sliding window pointer */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
317 crc = crc32(crc, window + have, DSIZE - have - strm->avail_out); |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
318 if (strm->avail_out) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
319 have = DSIZE - strm->avail_out; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
320 else { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
321 have = 0; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
322 full = 1; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
323 } |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
324 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
325 /* process end of block */ |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
326 if (strm->data_type & 128) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
327 if (strm->data_type & 64) |
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
328 left = strm->data_type & 0x1f; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
329 else { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
330 lastbit = strm->data_type & 0x1f; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
331 lastoff = lseek(gz.fd, 0L, SEEK_CUR) - strm->avail_in; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
332 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
333 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
334 } while (ret != Z_STREAM_END); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
335 inflateEnd(strm); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
336 gz.left = strm->avail_in; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
337 gz.next = strm->next_in; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
338 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
339 /* save the location of the end of the compressed data */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
340 end = lseek(gz.fd, 0L, SEEK_CUR) - gz.left; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
341 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
342 /* check gzip trailer and save total for deflate */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
343 if (crc != read4(&gz)) |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
344 bye("invalid compressed data--crc mismatch in ", name); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
345 tot = strm->total_out; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
346 if ((tot & 0xffffffffUL) != read4(&gz)) |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
347 bye("invalid compressed data--length mismatch in", name); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
348 |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
349 /* if not at end of file, warn */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
350 if (gz.left || readin(&gz)) |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
351 fprintf(stderr, |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
352 "gzappend warning: junk at end of gzip file overwritten\n"); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
353 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
354 /* clear last block bit */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
355 lseek(gz.fd, lastoff - (lastbit != 0), SEEK_SET); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
356 if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
357 *gz.buf = (unsigned char)(*gz.buf ^ (1 << ((8 - lastbit) & 7))); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
358 lseek(gz.fd, -1L, SEEK_CUR); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
359 if (write(gz.fd, gz.buf, 1) != 1) bye("writing after seek to ", name); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
360 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
361 /* if window wrapped, build dictionary from window by rotating */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
362 if (full) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
363 rotate(window, DSIZE, have); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
364 have = DSIZE; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
365 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
366 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
367 /* set up deflate stream with window, crc, total_in, and leftover bits */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
368 ret = deflateInit2(strm, level, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
369 if (ret != Z_OK) bye("out of memory", ""); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
370 deflateSetDictionary(strm, window, have); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
371 strm->adler = crc; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
372 strm->total_in = tot; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
373 if (left) { |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
374 lseek(gz.fd, --end, SEEK_SET); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
375 if (read(gz.fd, gz.buf, 1) != 1) bye("reading after seek on ", name); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
376 deflatePrime(strm, 8 - left, *gz.buf); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
377 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
378 lseek(gz.fd, end, SEEK_SET); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
379 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
380 /* clean up and return */ |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
381 free(window); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
382 free(gz.buf); |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
383 return gz.fd; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
384 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
385 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
386 /* append file "name" to gzip file gd using deflate stream strm -- if last |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
387 is true, then finish off the deflate stream at the end */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
388 local void gztack(char *name, int gd, z_stream *strm, int last) |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
389 { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
390 int fd, len, ret; |
ae3a4bfb450b
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kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
391 unsigned left; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
392 unsigned char *in, *out; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
393 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
394 /* open file to compress and append */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
395 fd = 0; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
396 if (name != NULL) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
397 fd = open(name, O_RDONLY, 0); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
398 if (fd == -1) |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
399 fprintf(stderr, "gzappend warning: %s not found, skipping ...\n", |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
400 name); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
401 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
402 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
403 /* allocate buffers */ |
111 | 404 in = malloc(CHUNK); |
51
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
405 out = malloc(CHUNK); |
111 | 406 if (in == NULL || out == NULL) bye("out of memory", ""); |
51
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
407 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
408 /* compress input file and append to gzip file */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
409 do { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
410 /* get more input */ |
111 | 411 len = read(fd, in, CHUNK); |
51
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
412 if (len == -1) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
413 fprintf(stderr, |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
414 "gzappend warning: error reading %s, skipping rest ...\n", |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
415 name); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
416 len = 0; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
417 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
418 strm->avail_in = (unsigned)len; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
419 strm->next_in = in; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
420 if (len) strm->adler = crc32(strm->adler, in, (unsigned)len); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
421 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
422 /* compress and write all available output */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
423 do { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
424 strm->avail_out = CHUNK; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
425 strm->next_out = out; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
426 ret = deflate(strm, last && len == 0 ? Z_FINISH : Z_NO_FLUSH); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
427 left = CHUNK - strm->avail_out; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
428 while (left) { |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
429 len = write(gd, out + CHUNK - strm->avail_out - left, left); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
430 if (len == -1) bye("writing gzip file", ""); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
431 left -= (unsigned)len; |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
432 } |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
433 } while (strm->avail_out == 0 && ret != Z_STREAM_END); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
434 } while (len != 0); |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
435 |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
436 /* write trailer after last entry */ |
ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
437 if (last) { |
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parents:
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438 deflateEnd(strm); |
ae3a4bfb450b
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439 out[0] = (unsigned char)(strm->adler); |
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440 out[1] = (unsigned char)(strm->adler >> 8); |
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441 out[2] = (unsigned char)(strm->adler >> 16); |
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442 out[3] = (unsigned char)(strm->adler >> 24); |
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443 out[4] = (unsigned char)(strm->total_in); |
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444 out[5] = (unsigned char)(strm->total_in >> 8); |
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445 out[6] = (unsigned char)(strm->total_in >> 16); |
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446 out[7] = (unsigned char)(strm->total_in >> 24); |
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447 len = 8; |
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parents:
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448 do { |
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449 ret = write(gd, out + 8 - len, len); |
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450 if (ret == -1) bye("writing gzip file", ""); |
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451 len -= ret; |
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452 } while (len); |
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453 close(gd); |
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454 } |
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455 |
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456 /* clean up and return */ |
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457 free(out); |
111 | 458 free(in); |
51
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459 if (fd > 0) close(fd); |
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460 } |
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461 |
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462 /* process the compression level option if present, scan the gzip file, and |
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463 append the specified files, or append the data from stdin if no other file |
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464 names are provided on the command line -- the gzip file must be writable |
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465 and seekable */ |
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466 int main(int argc, char **argv) |
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467 { |
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468 int gd, level; |
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469 z_stream strm; |
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parents:
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470 |
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parents:
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471 /* ignore command name */ |
111 | 472 argc--; argv++; |
51
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parents:
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473 |
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parents:
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474 /* provide usage if no arguments */ |
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475 if (*argv == NULL) { |
111 | 476 printf( |
477 "gzappend 1.2 (11 Oct 2012) Copyright (C) 2003, 2012 Mark Adler\n" | |
478 ); | |
51
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parents:
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479 printf( |
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480 "usage: gzappend [-level] file.gz [ addthis [ andthis ... ]]\n"); |
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parents:
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481 return 0; |
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parents:
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|
482 } |
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|
483 |
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parents:
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|
484 /* set compression level */ |
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parents:
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485 level = Z_DEFAULT_COMPRESSION; |
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parents:
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changeset
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486 if (argv[0][0] == '-') { |
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parents:
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|
487 if (argv[0][1] < '0' || argv[0][1] > '9' || argv[0][2] != 0) |
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parents:
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|
488 bye("invalid compression level", ""); |
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parents:
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489 level = argv[0][1] - '0'; |
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parents:
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|
490 if (*++argv == NULL) bye("no gzip file name after options", ""); |
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parents:
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changeset
|
491 } |
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parents:
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changeset
|
492 |
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parents:
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changeset
|
493 /* prepare to append to gzip file */ |
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parents:
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494 gd = gzscan(*argv++, &strm, level); |
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parents:
diff
changeset
|
495 |
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parents:
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changeset
|
496 /* append files on command line, or from stdin if none */ |
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parents:
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changeset
|
497 if (*argv == NULL) |
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parents:
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changeset
|
498 gztack(NULL, gd, &strm, 1); |
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parents:
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changeset
|
499 else |
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parents:
diff
changeset
|
500 do { |
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parents:
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changeset
|
501 gztack(*argv, gd, &strm, argv[1] == NULL); |
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parents:
diff
changeset
|
502 } while (*++argv != NULL); |
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parents:
diff
changeset
|
503 return 0; |
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parents:
diff
changeset
|
504 } |