Contents of /trunk/mkinitrd-magellan/klibc/usr/gzip/util.c
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Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
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Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
File MIME type: text/plain
File size: 11845 byte(s)
-updated to klibc-1.5.15
1 | /* util.c -- utility functions for gzip support |
2 | * Copyright (C) 1992-1993 Jean-loup Gailly |
3 | * This is free software; you can redistribute it and/or modify it under the |
4 | * terms of the GNU General Public License, see the file COPYING. |
5 | */ |
6 | |
7 | #ifdef RCSID |
8 | static char rcsid[] = "$Id: util.c,v 1.1 2002/08/18 00:59:21 hpa Exp $"; |
9 | #endif |
10 | |
11 | #include <ctype.h> |
12 | #include <errno.h> |
13 | #include <sys/types.h> |
14 | |
15 | #include "tailor.h" |
16 | |
17 | #include <unistd.h> |
18 | #include <fcntl.h> |
19 | #include <stdlib.h> |
20 | |
21 | #include "gzip.h" |
22 | |
23 | extern ulg crc_32_tab[]; /* crc table, defined below */ |
24 | |
25 | /* =========================================================================== |
26 | * Copy input to output unchanged: zcat == cat with --force. |
27 | * IN assertion: insize bytes have already been read in inbuf. |
28 | */ |
29 | int copy(in, out) |
30 | int in, out; /* input and output file descriptors */ |
31 | { |
32 | errno = 0; |
33 | while (insize != 0 && (int)insize != EOF) { |
34 | write_buf(out, (char*)inbuf, insize); |
35 | bytes_out += insize; |
36 | insize = read(in, (char*)inbuf, INBUFSIZ); |
37 | } |
38 | if ((int)insize == EOF && errno != 0) { |
39 | read_error(); |
40 | } |
41 | bytes_in = bytes_out; |
42 | return OK; |
43 | } |
44 | |
45 | /* =========================================================================== |
46 | * Run a set of bytes through the crc shift register. If s is a NULL |
47 | * pointer, then initialize the crc shift register contents instead. |
48 | * Return the current crc in either case. |
49 | */ |
50 | ulg updcrc(s, n) |
51 | uch *s; /* pointer to bytes to pump through */ |
52 | unsigned n; /* number of bytes in s[] */ |
53 | { |
54 | register ulg c; /* temporary variable */ |
55 | |
56 | static ulg crc = (ulg)0xffffffffL; /* shift register contents */ |
57 | |
58 | if (s == NULL) { |
59 | c = 0xffffffffL; |
60 | } else { |
61 | c = crc; |
62 | if (n) do { |
63 | c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8); |
64 | } while (--n); |
65 | } |
66 | crc = c; |
67 | return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */ |
68 | } |
69 | |
70 | /* =========================================================================== |
71 | * Clear input and output buffers |
72 | */ |
73 | void clear_bufs() |
74 | { |
75 | outcnt = 0; |
76 | insize = inptr = 0; |
77 | bytes_in = bytes_out = 0L; |
78 | } |
79 | |
80 | /* =========================================================================== |
81 | * Fill the input buffer. This is called only when the buffer is empty. |
82 | */ |
83 | int fill_inbuf(eof_ok) |
84 | int eof_ok; /* set if EOF acceptable as a result */ |
85 | { |
86 | int len; |
87 | |
88 | /* Read as much as possible */ |
89 | insize = 0; |
90 | errno = 0; |
91 | do { |
92 | len = read(ifd, (char*)inbuf+insize, INBUFSIZ-insize); |
93 | if (len == 0 || len == EOF) break; |
94 | insize += len; |
95 | } while (insize < INBUFSIZ); |
96 | |
97 | if (insize == 0) { |
98 | if (eof_ok) return EOF; |
99 | read_error(); |
100 | } |
101 | bytes_in += (ulg)insize; |
102 | inptr = 1; |
103 | return inbuf[0]; |
104 | } |
105 | |
106 | /* =========================================================================== |
107 | * Write the output buffer outbuf[0..outcnt-1] and update bytes_out. |
108 | * (used for the compressed data only) |
109 | */ |
110 | void flush_outbuf() |
111 | { |
112 | if (outcnt == 0) return; |
113 | |
114 | write_buf(ofd, (char *)outbuf, outcnt); |
115 | bytes_out += (ulg)outcnt; |
116 | outcnt = 0; |
117 | } |
118 | |
119 | /* =========================================================================== |
120 | * Write the output window window[0..outcnt-1] and update crc and bytes_out. |
121 | * (Used for the decompressed data only.) |
122 | */ |
123 | void flush_window() |
124 | { |
125 | if (outcnt == 0) return; |
126 | updcrc(window, outcnt); |
127 | |
128 | if (!test) { |
129 | write_buf(ofd, (char *)window, outcnt); |
130 | } |
131 | bytes_out += (ulg)outcnt; |
132 | outcnt = 0; |
133 | } |
134 | |
135 | /* =========================================================================== |
136 | * Does the same as write(), but also handles partial pipe writes and checks |
137 | * for error return. |
138 | */ |
139 | void write_buf(fd, buf, cnt) |
140 | int fd; |
141 | voidp buf; |
142 | unsigned cnt; |
143 | { |
144 | unsigned n; |
145 | |
146 | while ((n = write(fd, buf, cnt)) != cnt) { |
147 | if (n == (unsigned)(-1)) { |
148 | write_error(); |
149 | } |
150 | cnt -= n; |
151 | buf = (voidp)((char*)buf+n); |
152 | } |
153 | } |
154 | |
155 | /* ======================================================================== |
156 | * Put string s in lower case, return s. |
157 | */ |
158 | char *strlwr(s) |
159 | char *s; |
160 | { |
161 | char *t; |
162 | for (t = s; *t; t++) *t = tolow(*t); |
163 | return s; |
164 | } |
165 | |
166 | /* ======================================================================== |
167 | * Return the base name of a file (remove any directory prefix and |
168 | * any version suffix). For systems with file names that are not |
169 | * case sensitive, force the base name to lower case. |
170 | */ |
171 | char *basename(fname) |
172 | char *fname; |
173 | { |
174 | char *p; |
175 | |
176 | if ((p = strrchr(fname, PATH_SEP)) != NULL) fname = p+1; |
177 | if (casemap('A') == 'a') strlwr(fname); |
178 | return fname; |
179 | } |
180 | |
181 | /* ======================================================================== |
182 | * Add an environment variable (if any) before argv, and update argc. |
183 | * Return the expanded environment variable to be freed later, or NULL |
184 | * if no options were added to argv. |
185 | */ |
186 | #define SEPARATOR " \t" /* separators in env variable */ |
187 | |
188 | char *add_envopt(argcp, argvp, env) |
189 | int *argcp; /* pointer to argc */ |
190 | char ***argvp; /* pointer to argv */ |
191 | char *env; /* name of environment variable */ |
192 | { |
193 | char *p; /* running pointer through env variable */ |
194 | char **oargv; /* runs through old argv array */ |
195 | char **nargv; /* runs through new argv array */ |
196 | int oargc = *argcp; /* old argc */ |
197 | int nargc = 0; /* number of arguments in env variable */ |
198 | |
199 | env = (char*)getenv(env); |
200 | if (env == NULL) return NULL; |
201 | |
202 | p = (char*)xmalloc(strlen(env)+1); |
203 | env = strcpy(p, env); /* keep env variable intact */ |
204 | |
205 | for (p = env; *p; nargc++ ) { /* move through env */ |
206 | p += strspn(p, SEPARATOR); /* skip leading separators */ |
207 | if (*p == '\0') break; |
208 | |
209 | p += strcspn(p, SEPARATOR); /* find end of word */ |
210 | if (*p) *p++ = '\0'; /* mark it */ |
211 | } |
212 | if (nargc == 0) { |
213 | free(env); |
214 | return NULL; |
215 | } |
216 | *argcp += nargc; |
217 | /* Allocate the new argv array, with an extra element just in case |
218 | * the original arg list did not end with a NULL. |
219 | */ |
220 | nargv = (char**)calloc(*argcp+1, sizeof(char *)); |
221 | if (nargv == NULL) error("out of memory"); |
222 | oargv = *argvp; |
223 | *argvp = nargv; |
224 | |
225 | /* Copy the program name first */ |
226 | if (oargc-- < 0) error("argc<=0"); |
227 | *(nargv++) = *(oargv++); |
228 | |
229 | /* Then copy the environment args */ |
230 | for (p = env; nargc > 0; nargc--) { |
231 | p += strspn(p, SEPARATOR); /* skip separators */ |
232 | *(nargv++) = p; /* store start */ |
233 | while (*p++) ; /* skip over word */ |
234 | } |
235 | |
236 | /* Finally copy the old args and add a NULL (usual convention) */ |
237 | while (oargc--) *(nargv++) = *(oargv++); |
238 | *nargv = NULL; |
239 | return env; |
240 | } |
241 | |
242 | /* ======================================================================== |
243 | * Error handlers. |
244 | */ |
245 | void error(m) |
246 | char *m; |
247 | { |
248 | fprintf(stderr, "\n%s: %s: %s\n", progname, ifname, m); |
249 | abort_gzip(); |
250 | } |
251 | |
252 | void warn(a, b) |
253 | char *a, *b; /* message strings juxtaposed in output */ |
254 | { |
255 | WARN((stderr, "%s: %s: warning: %s%s\n", progname, ifname, a, b)); |
256 | } |
257 | |
258 | void read_error() |
259 | { |
260 | fprintf(stderr, "\n%s: ", progname); |
261 | if (errno != 0) { |
262 | perror(ifname); |
263 | } else { |
264 | fprintf(stderr, "%s: unexpected end of file\n", ifname); |
265 | } |
266 | abort_gzip(); |
267 | } |
268 | |
269 | void write_error() |
270 | { |
271 | fprintf(stderr, "\n%s: ", progname); |
272 | perror(ofname); |
273 | abort_gzip(); |
274 | } |
275 | |
276 | /* ======================================================================== |
277 | * Display compression ratio on the given stream on 6 characters. |
278 | */ |
279 | void display_ratio(num, den, file) |
280 | long num; |
281 | long den; |
282 | FILE *file; |
283 | { |
284 | long ratio; /* 1000 times the compression ratio */ |
285 | char sign; |
286 | |
287 | if (den == 0) { |
288 | ratio = 0; /* no compression */ |
289 | } else if (den < 2147483L) { /* (2**31 -1)/1000 */ |
290 | ratio = 1000L*num/den; |
291 | } else { |
292 | ratio = num/(den/1000L); |
293 | } |
294 | if (ratio < 0) { |
295 | sign = '-'; |
296 | ratio = -ratio; |
297 | } else { |
298 | sign = ' '; |
299 | } |
300 | fprintf(file, "%c%2ld.%1ld%%", sign, ratio / 10L, ratio % 10L); |
301 | } |
302 | |
303 | |
304 | /* ======================================================================== |
305 | * Semi-safe malloc -- never returns NULL. |
306 | */ |
307 | voidp xmalloc (size) |
308 | unsigned size; |
309 | { |
310 | voidp cp = (voidp)malloc (size); |
311 | |
312 | if (cp == NULL) error("out of memory"); |
313 | return cp; |
314 | } |
315 | |
316 | /* ======================================================================== |
317 | * Table of CRC-32's of all single-byte values (made by makecrc.c) |
318 | */ |
319 | ulg crc_32_tab[] = { |
320 | 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, |
321 | 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, |
322 | 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, |
323 | 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, |
324 | 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, |
325 | 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, |
326 | 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, |
327 | 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, |
328 | 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, |
329 | 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, |
330 | 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, |
331 | 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, |
332 | 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, |
333 | 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, |
334 | 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, |
335 | 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, |
336 | 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, |
337 | 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, |
338 | 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, |
339 | 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, |
340 | 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, |
341 | 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, |
342 | 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, |
343 | 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, |
344 | 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, |
345 | 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, |
346 | 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, |
347 | 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, |
348 | 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, |
349 | 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, |
350 | 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, |
351 | 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, |
352 | 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, |
353 | 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, |
354 | 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, |
355 | 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, |
356 | 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, |
357 | 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, |
358 | 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, |
359 | 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, |
360 | 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, |
361 | 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, |
362 | 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, |
363 | 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, |
364 | 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, |
365 | 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, |
366 | 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, |
367 | 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, |
368 | 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, |
369 | 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, |
370 | 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, |
371 | 0x2d02ef8dL |
372 | }; |