diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 508 |
1 files changed, 508 insertions, 0 deletions
@@ -0,0 +1,508 @@ +/* util.c -- utility functions for gzip support + + Copyright (C) 1997-1999, 2001-2002, 2006, 2009-2016 Free Software + Foundation, Inc. + Copyright (C) 1992-1993 Jean-loup Gailly + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#include <config.h> +#include <ctype.h> +#include <errno.h> +#include <limits.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdlib.h> +#include <errno.h> + +#include "tailor.h" +#include "gzip.h" +#include <xalloc.h> + +#ifndef CHAR_BIT +# define CHAR_BIT 8 +#endif + +static int write_buffer (int, voidp, unsigned int); + +/* ======================================================================== + * Table of CRC-32's of all single-byte values (made by makecrc.c) + */ +static const ulg crc_32_tab[] = { + 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, + 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, + 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, + 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, + 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, + 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, + 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, + 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, + 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, + 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, + 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, + 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, + 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, + 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, + 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, + 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, + 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, + 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, + 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, + 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, + 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, + 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, + 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, + 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, + 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, + 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, + 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, + 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, + 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, + 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, + 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, + 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, + 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, + 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, + 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, + 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, + 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, + 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, + 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, + 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, + 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, + 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, + 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, + 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, + 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, + 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, + 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, + 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, + 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, + 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, + 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, + 0x2d02ef8dL +}; + +/* =========================================================================== + * Copy input to output unchanged: zcat == cat with --force. + * IN assertion: insize bytes have already been read in inbuf and inptr bytes + * already processed or copied. + */ +int copy(in, out) + int in, out; /* input and output file descriptors */ +{ + int got; + + errno = 0; + while (insize > inptr) { + write_buf(out, (char*)inbuf + inptr, insize - inptr); + bytes_out += insize - inptr; + got = read_buffer (in, (char *) inbuf, INBUFSIZ); + if (got == -1) + read_error(); + bytes_in += got; + insize = (unsigned)got; + inptr = 0; + } + return OK; +} + +/* =========================================================================== + * Run a set of bytes through the crc shift register. If s is a NULL + * pointer, then initialize the crc shift register contents instead. + * Return the current crc in either case. + */ +ulg updcrc(s, n) + uch *s; /* pointer to bytes to pump through */ + unsigned n; /* number of bytes in s[] */ +{ + register ulg c; /* temporary variable */ + + static ulg crc = (ulg)0xffffffffL; /* shift register contents */ + + if (s == NULL) { + c = 0xffffffffL; + } else { + c = crc; + if (n) do { + c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8); + } while (--n); + } + crc = c; + return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */ +} + +/* =========================================================================== + * Clear input and output buffers + */ +void clear_bufs() +{ + outcnt = 0; + insize = inptr = 0; + bytes_in = bytes_out = 0L; +} + +/* =========================================================================== + * Fill the input buffer. This is called only when the buffer is empty. + */ +int fill_inbuf(eof_ok) + int eof_ok; /* set if EOF acceptable as a result */ +{ + int len; + + /* Read as much as possible */ + insize = 0; + do { + len = read_buffer (ifd, (char *) inbuf + insize, INBUFSIZ - insize); + if (len == 0) break; + if (len == -1) { + read_error(); + break; + } + insize += len; + } while (insize < INBUFSIZ); + + if (insize == 0) { + if (eof_ok) return EOF; + flush_window(); + errno = 0; + read_error(); + } + bytes_in += (off_t)insize; + inptr = 1; + return inbuf[0]; +} + +/* Like the standard read function, except do not attempt to read more + than INT_MAX bytes at a time. */ +int +read_buffer (fd, buf, cnt) + int fd; + voidp buf; + unsigned int cnt; +{ + int len; + if (INT_MAX < cnt) + cnt = INT_MAX; + len = read (fd, buf, cnt); + +#if defined F_SETFL && O_NONBLOCK && defined EAGAIN + /* Input files are opened O_NONBLOCK for security reasons. On some + file systems this can cause read to fail with errno == EAGAIN. */ + if (len < 0 && errno == EAGAIN) + { + int flags = fcntl (fd, F_GETFL); + if (0 <= flags) + { + if (! (flags & O_NONBLOCK)) + errno = EAGAIN; + else if (fcntl (fd, F_SETFL, flags & ~O_NONBLOCK) != -1) + len = read (fd, buf, cnt); + } + } +#endif + + return len; +} + +/* Likewise for 'write'. */ +static int +write_buffer (fd, buf, cnt) + int fd; + voidp buf; + unsigned int cnt; +{ + if (INT_MAX < cnt) + cnt = INT_MAX; + return write (fd, buf, cnt); +} + +/* =========================================================================== + * Write the output buffer outbuf[0..outcnt-1] and update bytes_out. + * (used for the compressed data only) + */ +void flush_outbuf() +{ + if (outcnt == 0) return; + + write_buf(ofd, (char *)outbuf, outcnt); + bytes_out += (off_t)outcnt; + outcnt = 0; +} + +/* =========================================================================== + * Write the output window window[0..outcnt-1] and update crc and bytes_out. + * (Used for the decompressed data only.) + */ +void flush_window() +{ + if (outcnt == 0) return; + updcrc(window, outcnt); + + if (!test) { + write_buf(ofd, (char *)window, outcnt); + } + bytes_out += (off_t)outcnt; + outcnt = 0; +} + +/* =========================================================================== + * Does the same as write(), but also handles partial pipe writes and checks + * for error return. + */ +void write_buf(fd, buf, cnt) + int fd; + voidp buf; + unsigned cnt; +{ + unsigned n; + + while ((n = write_buffer (fd, buf, cnt)) != cnt) { + if (n == (unsigned)(-1)) { + write_error(); + } + cnt -= n; + buf = (voidp)((char*)buf+n); + } +} + +/* ======================================================================== + * Put string s in lower case, return s. + */ +char *strlwr(s) + char *s; +{ + char *t; + for (t = s; *t; t++) + *t = tolow ((unsigned char) *t); + return s; +} + +/* ======================================================================== + * Return the base name of a file (remove any directory prefix and + * any version suffix). For systems with file names that are not + * case sensitive, force the base name to lower case. + */ +char * +gzip_base_name (fname) + char *fname; +{ + char *p; + + if ((p = strrchr(fname, PATH_SEP)) != NULL) fname = p+1; +#ifdef PATH_SEP2 + if ((p = strrchr(fname, PATH_SEP2)) != NULL) fname = p+1; +#endif +#ifdef PATH_SEP3 + if ((p = strrchr(fname, PATH_SEP3)) != NULL) fname = p+1; +#endif +#ifdef SUFFIX_SEP + if ((p = strrchr(fname, SUFFIX_SEP)) != NULL) *p = '\0'; +#endif + if (casemap('A') == 'a') strlwr(fname); + return fname; +} + +/* ======================================================================== + * Unlink a file, working around the unlink readonly bug (if present). + */ +int xunlink (filename) + char *filename; +{ + int r = unlink (filename); + +#ifdef UNLINK_READONLY_BUG + if (r != 0) + { + int e = errno; + if (chmod (filename, S_IWUSR) != 0) + { + errno = e; + return -1; + } + + r = unlink (filename); + } +#endif + + return r; +} + +/* ======================================================================== + * Make a file name legal for file systems not allowing file names with + * multiple dots or starting with a dot (such as MSDOS), by changing + * all dots except the last one into underlines. A target dependent + * function can be used instead of this simple function by defining the macro + * MAKE_LEGAL_NAME in tailor.h and providing the function in a target + * dependent module. + */ +void make_simple_name(name) + char *name; +{ + char *p = strrchr(name, '.'); + if (p == NULL) return; + if (p == name) p++; + do { + if (*--p == '.') *p = '_'; + } while (p != name); +} + +/* Convert the value of the environment variable ENVVAR_NAME + to a newly allocated argument vector, and set *ARGCP and *ARGVP + to the number of arguments and to the vector, respectively. + Make the new vector's zeroth element equal to the old **ARGVP. + Return a pointer to the newly allocated string storage. + + If the vector would be empty, do not allocate storage, + do not set *ARGCP and *ARGVP, and return NULL. */ + +#define SEPARATOR " \t" /* separators in env variable */ + +char *add_envopt( + int *argcp, /* pointer to argc */ + char ***argvp, /* pointer to argv */ + char const *envvar_name) /* name of environment variable */ +{ + char *p; /* running pointer through env variable */ + char **oargv; /* runs through old argv array */ + char **nargv; /* runs through new argv array */ + int nargc = 0; /* number of arguments in env variable */ + char *env_val; + + env_val = getenv(envvar_name); + if (env_val == NULL) return NULL; + + env_val = xstrdup (env_val); + + for (p = env_val; *p; nargc++ ) { /* move through env_val */ + p += strspn(p, SEPARATOR); /* skip leading separators */ + if (*p == '\0') break; + + p += strcspn(p, SEPARATOR); /* find end of word */ + if (*p) *p++ = '\0'; /* mark it */ + } + if (nargc == 0) { + free(env_val); + return NULL; + } + *argcp = nargc + 1; + /* Allocate the new argv array, with an extra element just in case + * the original arg list did not end with a NULL. + */ + nargv = xcalloc (*argcp + 1, sizeof (char *)); + oargv = *argvp; + *argvp = nargv; + + /* Copy the program name first */ + *nargv++ = *oargv; + + /* Then copy the environment args */ + for (p = env_val; nargc > 0; nargc--) { + p += strspn(p, SEPARATOR); /* skip separators */ + *(nargv++) = p; /* store start */ + while (*p++) ; /* skip over word */ + } + + *nargv = NULL; + return env_val; +} + +/* ======================================================================== + * Error handlers. + */ +void +gzip_error (char const *m) +{ + fprintf (stderr, "\n%s: %s: %s\n", program_name, ifname, m); + abort_gzip(); +} + +void +xalloc_die () +{ + fprintf (stderr, "\n%s: memory_exhausted\n", program_name); + abort_gzip (); +} + +void warning (char const *m) +{ + WARN ((stderr, "%s: %s: warning: %s\n", program_name, ifname, m)); +} + +void read_error() +{ + int e = errno; + fprintf (stderr, "\n%s: ", program_name); + if (e != 0) { + errno = e; + perror(ifname); + } else { + fprintf(stderr, "%s: unexpected end of file\n", ifname); + } + abort_gzip(); +} + +void write_error() +{ + int e = errno; + fprintf (stderr, "\n%s: ", program_name); + errno = e; + perror(ofname); + abort_gzip(); +} + +/* ======================================================================== + * Display compression ratio on the given stream on 6 characters. + */ +void display_ratio(num, den, file) + off_t num; + off_t den; + FILE *file; +{ + fprintf(file, "%5.1f%%", den == 0 ? 0 : 100.0 * num / den); +} + +/* ======================================================================== + * Print an off_t. There's no completely portable way to use printf, + * so we do it ourselves. + */ +void fprint_off(file, offset, width) + FILE *file; + off_t offset; + int width; +{ + char buf[CHAR_BIT * sizeof (off_t)]; + char *p = buf + sizeof buf; + + /* Don't negate offset here; it might overflow. */ + if (offset < 0) { + do + *--p = '0' - offset % 10; + while ((offset /= 10) != 0); + + *--p = '-'; + } else { + do + *--p = '0' + offset % 10; + while ((offset /= 10) != 0); + } + + width -= buf + sizeof buf - p; + while (0 < width--) { + putc (' ', file); + } + for (; p < buf + sizeof buf; p++) + putc (*p, file); +} |