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Annotation of coherent/g/usr/bin/gzip/util.c, revision 1.1

1.1     ! root        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: #ifndef lint
        !             8: static char rcsid[] = "$Id: util.c,v 0.11 1993/02/24 18:23:13 jloup Exp $";
        !             9: #endif
        !            10: 
        !            11: #include "tailor.h"
        !            12: #include "gzip.h"
        !            13: #include "crypt.h"
        !            14: 
        !            15: #include <stdio.h>
        !            16: #include <ctype.h>
        !            17: #include <errno.h>
        !            18: 
        !            19: #ifdef HAVE_UNISTD_H
        !            20: #  include <sys/types.h>
        !            21: #  include <unistd.h>
        !            22: #endif
        !            23: 
        !            24: #if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
        !            25: #  include <stdlib.h>
        !            26: #else
        !            27:    extern int errno;
        !            28: #endif
        !            29: 
        !            30: extern ulg crc_32_tab[];   /* crc table, defined below */
        !            31: 
        !            32: /* ===========================================================================
        !            33:  * Run a set of bytes through the crc shift register.  If s is a NULL
        !            34:  * pointer, then initialize the crc shift register contents instead.
        !            35:  * Return the current crc in either case.
        !            36:  */
        !            37: ulg updcrc(s, n)
        !            38:     uch *s;                 /* pointer to bytes to pump through */
        !            39:     unsigned n;             /* number of bytes in s[] */
        !            40: {
        !            41:     register ulg c;         /* temporary variable */
        !            42: 
        !            43:     static ulg crc = (ulg)0xffffffffL; /* shift register contents */
        !            44: 
        !            45:     if (s == NULL) {
        !            46:        c = 0xffffffffL;
        !            47:     } else {
        !            48:        c = crc;
        !            49:        while (n--) {
        !            50:            c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
        !            51:        }
        !            52:     }
        !            53:     crc = c;
        !            54:     return c ^ 0xffffffffL;       /* (instead of ~c for 64-bit machines) */
        !            55: }
        !            56: 
        !            57: /* ===========================================================================
        !            58:  * Clear input and output buffers
        !            59:  */
        !            60: void clear_bufs()
        !            61: {
        !            62:     outcnt = 0;
        !            63:     insize = inptr = 0;
        !            64:     bytes_in = bytes_out = 0L;
        !            65: }
        !            66: 
        !            67: /* ===========================================================================
        !            68:  * Fill the input buffer. This is called only when the buffer is empty
        !            69:  * and at least one byte is really needed.
        !            70:  */
        !            71: int fill_inbuf()
        !            72: {
        !            73:     int len;
        !            74: 
        !            75:     /* Read as much as possible */
        !            76:     insize = 0;
        !            77:     do {
        !            78:        len = read(ifd, inbuf+insize, INBUFSIZ-insize);
        !            79:         if (len == 0 || len == EOF) break;
        !            80:        insize += len;
        !            81:     } while (insize < INBUFSIZ);
        !            82: 
        !            83:     if (insize == 0) {
        !            84:        read_error();
        !            85:     }
        !            86:     bytes_in += (ulg)insize;
        !            87:     inptr = 1;
        !            88:     return inbuf[0];
        !            89: }
        !            90: 
        !            91: /* ===========================================================================
        !            92:  * Write the output buffer outbuf[0..outcnt-1] and update bytes_out.
        !            93:  * (used for the compressed data only)
        !            94:  */
        !            95: void flush_outbuf()
        !            96: {
        !            97:     if (outcnt == 0) return;
        !            98: 
        !            99:     if (write(ofd, (char *)outbuf, outcnt) != outcnt) {
        !           100:        write_error();
        !           101:     }
        !           102:     bytes_out += (ulg)outcnt;
        !           103:     outcnt = 0;
        !           104: }
        !           105: 
        !           106: /* ===========================================================================
        !           107:  * Write the output window window[0..outcnt-1] and update crc and bytes_out.
        !           108:  * (Used for the decompressed data only.)
        !           109:  */
        !           110: void flush_window()
        !           111: {
        !           112:     if (outcnt == 0) return;
        !           113:     updcrc(window, outcnt);
        !           114: 
        !           115:     if (!test && write(ofd, (char *)window, outcnt) != outcnt) {
        !           116:        write_error();
        !           117:     }
        !           118:     bytes_out += (ulg)outcnt;
        !           119:     outcnt = 0;
        !           120: }
        !           121: 
        !           122: 
        !           123: /* ======================================================================== */
        !           124: char *strlwr(s)
        !           125:    /* put string s in lower case, return s */
        !           126:    char *s;
        !           127: {
        !           128:    char *t;
        !           129:    for (t = s; *t; t++) *t = tolow(*t);
        !           130:    return s;
        !           131: }
        !           132: 
        !           133: /* ========================================================================
        !           134:  * Return the base name of a file (remove any directory prefix and
        !           135:  * any version suffix). For systems with filenames that are not
        !           136:  * case sensitive, force the base name to lower case.
        !           137:  */
        !           138: char *basename(fname)
        !           139:    char *fname;
        !           140: {
        !           141:    char *p;
        !           142: 
        !           143:    if ((p = strrchr(fname, PATH_SEP))  != NULL) fname = p+1;
        !           144: #ifdef PATH_SEP2
        !           145:    if ((p = strrchr(fname, PATH_SEP2)) != NULL) fname = p+1;
        !           146: #endif
        !           147: #ifdef PATH_SEP3
        !           148:    if ((p = strrchr(fname, PATH_SEP3)) != NULL) fname = p+1;
        !           149: #endif
        !           150: #ifdef SUFFIX_SEP
        !           151:    if ((p = strrchr(fname, SUFFIX_SEP)) != NULL) *p = '\0';
        !           152: #endif
        !           153:    if (casemap('A') == 'a') strlwr(fname);
        !           154:    return fname;
        !           155: }
        !           156: 
        !           157: /* ========================================================================
        !           158:  * Add an environment variable (if any) before argv, and update argc.
        !           159:  * Return the expanded environment variable to be freed later, or NULL 
        !           160:  * if no options were added to argv.
        !           161:  */
        !           162: #define SEPARATOR      " \t"   /* separators in env variable */
        !           163: 
        !           164: char *add_envopt(argcp, argvp, env)
        !           165:     int *argcp;          /* pointer to argc */
        !           166:     char ***argvp;       /* pointer to argv */
        !           167:     char *env;           /* name of environment variable */
        !           168: {
        !           169:     char *p;             /* running pointer through env variable */
        !           170:     char **oargv;        /* runs through old argv array */
        !           171:     char **nargv;        /* runs through new argv array */
        !           172:     int         oargc = *argcp; /* old argc */
        !           173:     int  nargc = 0;      /* number of arguments in env variable */
        !           174: 
        !           175:     env = (char*)getenv(env);
        !           176:     if (env == NULL) return NULL;
        !           177: 
        !           178:     p = (char*)xmalloc(strlen(env)+1);
        !           179:     env = strcpy(p, env);                    /* keep env variable intact */
        !           180: 
        !           181:     for (p = env; *p; nargc++ ) {            /* move through env */
        !           182:        p += strspn(p, SEPARATOR);           /* skip leading separators */
        !           183:        if (*p == '\0') break;
        !           184: 
        !           185:        p += strcspn(p, SEPARATOR);          /* find end of word */
        !           186:        if (*p) *p++ = '\0';                 /* mark it */
        !           187:     }
        !           188:     if (nargc == 0) {
        !           189:        free(env); env = NULL;
        !           190:        return NULL;
        !           191:     }
        !           192:     *argcp += nargc;
        !           193:     /* Allocate the new argv array, with an extra element just in case
        !           194:      * the original arg list did not end with a NULL.
        !           195:      */
        !           196:     nargv = (char**)calloc(*argcp+1, sizeof(char *));
        !           197:     if (nargv == NULL) error("out of memory");
        !           198:     oargv  = *argvp;
        !           199:     *argvp = nargv;
        !           200: 
        !           201:     /* Copy the program name first */
        !           202:     if (oargc-- < 0) error("argc<=0");
        !           203:     *(nargv++) = *(oargv++);
        !           204: 
        !           205:     /* Then copy the environment args */
        !           206:     for (p = env; nargc > 0; nargc--) {
        !           207:        p += strspn(p, SEPARATOR);           /* skip separators */
        !           208:        *(nargv++) = p;                      /* store start */
        !           209:        while (*p++) ;                       /* skip over word */
        !           210:     }
        !           211: 
        !           212:     /* Finally copy the old args and add a NULL (usual convention) */
        !           213:     while (oargc--) *(nargv++) = *(oargv++);
        !           214:     *nargv = NULL;
        !           215:     return env;
        !           216: }
        !           217: 
        !           218: /* ========================================================================
        !           219:  * Error handlers.
        !           220:  */
        !           221: void error(m)
        !           222:     char *m;
        !           223: {
        !           224:     fprintf(stderr, "%s: %s\n", ifname, m);
        !           225:     abort_gzip();
        !           226: }
        !           227: 
        !           228: void warn(a, b)
        !           229:     char *a, *b;            /* message strings juxtaposed in output */
        !           230: {
        !           231:     WARN((stderr, " warning: %s%s\n", a, b));
        !           232: }
        !           233: 
        !           234: void read_error()
        !           235: {
        !           236:     fprintf(stderr, "\nread error on ");
        !           237:     if (errno != 0) {
        !           238:        perror(ifname);
        !           239:     } else {
        !           240:        fprintf(stderr, "%s: unexpected end of file\n", ifname);
        !           241:     }
        !           242:     abort_gzip();
        !           243: }
        !           244: 
        !           245: void write_error()
        !           246: {
        !           247:     fprintf(stderr, "\nwrite error on ");
        !           248:     perror(ofname);
        !           249:     abort_gzip();
        !           250: }
        !           251: 
        !           252: /* ========================================================================
        !           253:  * Display compression ratio on stderr.
        !           254:  */
        !           255: void display_ratio(num, den)
        !           256:     long num;
        !           257:     long den;
        !           258: {
        !           259:     long ratio;  /* 1000 times the compression ratio */
        !           260: 
        !           261:     if (den == 0) {
        !           262:        ratio = 0; /* no compression */
        !           263:     } else if (den < 2147483L) { /* (2**31 -1)/1000 */
        !           264:        ratio = 1000L*num/den;
        !           265:     } else {
        !           266:        ratio = num/(den/1000L);
        !           267:     }
        !           268:     if (ratio < 0) {
        !           269:        putc('-', stderr);
        !           270:        ratio = -ratio;
        !           271:     }
        !           272:     fprintf(stderr, "%2ld.%ld%%", ratio / 10L, ratio % 10L);
        !           273: }
        !           274: 
        !           275: 
        !           276: /* ========================================================================
        !           277:  * Semi-safe malloc -- never returns NULL.
        !           278:  */
        !           279: voidp xmalloc (size)
        !           280:     unsigned size;
        !           281: {
        !           282:     voidp cp = (voidp)malloc (size);
        !           283: 
        !           284:     if (cp == NULL) error("out of memory");
        !           285:     return cp;
        !           286: }
        !           287: 
        !           288: /* ========================================================================
        !           289:  * Table of CRC-32's of all single-byte values (made by makecrc.c)
        !           290:  */
        !           291: ulg crc_32_tab[] = {
        !           292:   0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
        !           293:   0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
        !           294:   0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
        !           295:   0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
        !           296:   0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
        !           297:   0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
        !           298:   0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
        !           299:   0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
        !           300:   0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
        !           301:   0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
        !           302:   0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
        !           303:   0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
        !           304:   0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
        !           305:   0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
        !           306:   0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
        !           307:   0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
        !           308:   0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
        !           309:   0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
        !           310:   0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
        !           311:   0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
        !           312:   0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
        !           313:   0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
        !           314:   0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
        !           315:   0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
        !           316:   0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
        !           317:   0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
        !           318:   0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
        !           319:   0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
        !           320:   0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
        !           321:   0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
        !           322:   0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
        !           323:   0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
        !           324:   0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
        !           325:   0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
        !           326:   0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
        !           327:   0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
        !           328:   0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
        !           329:   0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
        !           330:   0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
        !           331:   0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
        !           332:   0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
        !           333:   0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
        !           334:   0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
        !           335:   0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
        !           336:   0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
        !           337:   0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
        !           338:   0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
        !           339:   0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
        !           340:   0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
        !           341:   0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
        !           342:   0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
        !           343:   0x2d02ef8dL
        !           344: };

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