Source Jam - gzip-1.3.12

00118 {
00119     ulg orig_crc = 0;       /* original crc */
00120     ulg orig_len = 0;       /* original uncompressed length */
00121     int n;
00122     uch buf[EXTHDR];        /* extended local header */
00123     int err = OK;
00124 
00125     ifd = in;
00126     ofd = out;
00127 
00128     updcrc(NULL, 0);           /* initialize crc */
00129 
00130     if (pkzip && !ext_header) {  /* crc and length at the end otherwise */
00131         orig_crc = LG(inbuf + LOCCRC);
00132         orig_len = LG(inbuf + LOCLEN);
00133     }
00134 
00135     /* Decompress */
00136     if (method == DEFLATED)  {
00137 
00138         int res = inflate();
00139 
00140         if (res == 3) {
00141             xalloc_die ();
00142         } else if (res != 0) {
00143             gzip_error ("invalid compressed data--format violated");
00144         }
00145 
00146     } else if (pkzip && method == STORED) {
00147 
00148         register ulg n = LG(inbuf + LOCLEN);
00149 
00150         if (n != LG(inbuf + LOCSIZ) - (decrypt ? RAND_HEAD_LEN : 0)) {
00151 
00152             fprintf(stderr, "len %ld, siz %ld\n", n, LG(inbuf + LOCSIZ));
00153             gzip_error ("invalid compressed data--length mismatch");
00154         }
00155         while (n--) {
00156             uch c = (uch)get_byte();
00157             put_ubyte(c);
00158         }
00159         flush_window();
00160     } else {
00161         gzip_error ("internal error, invalid method");
00162     }
00163 
00164     /* Get the crc and original length */
00165     if (!pkzip) {
00166         /* crc32  (see algorithm.doc)
00167          * uncompressed input size modulo 2^32
00168          */
00169         for (n = 0; n < 8; n++) {
00170             buf[n] = (uch)get_byte(); /* may cause an error if EOF */
00171         }
00172         orig_crc = LG(buf);
00173         orig_len = LG(buf+4);
00174 
00175     } else if (ext_header) {  /* If extended header, check it */
00176         /* signature - 4bytes: 0x50 0x4b 0x07 0x08
00177          * CRC-32 value
00178          * compressed size 4-bytes
00179          * uncompressed size 4-bytes
00180          */
00181         for (n = 0; n < EXTHDR; n++) {
00182             buf[n] = (uch)get_byte(); /* may cause an error if EOF */
00183         }
00184         orig_crc = LG(buf+4);
00185         orig_len = LG(buf+12);
00186     }
00187 
00188     /* Validate decompression */
00189     if (orig_crc != updcrc(outbuf, 0)) {
00190         fprintf(stderr, "\n%s: %s: invalid compressed data--crc error\n",
00191                 program_name, ifname);
00192         err = ERROR;
00193     }
00194     if (orig_len != (ulg)(bytes_out & 0xffffffff)) {
00195         fprintf(stderr, "\n%s: %s: invalid compressed data--length error\n",
00196                 program_name, ifname);
00197         err = ERROR;
00198     }
00199 
00200     /* Check if there are more entries in a pkzip file */
00201     if (pkzip && inptr + 4 < insize && LG(inbuf+inptr) == LOCSIG) {
00202         if (to_stdout) {
00203             WARN((stderr,
00204                   "%s: %s has more than one entry--rest ignored\n",
00205                   program_name, ifname));
00206         } else {
00207             /* Don't destroy the input zip file */
00208             fprintf(stderr,
00209                     "%s: %s has more than one entry -- unchanged\n",
00210                     program_name, ifname);
00211             err = ERROR;
00212         }
00213     }
00214     ext_header = pkzip = 0; /* for next file */
00215     if (err == OK) return OK;
00216     exit_code = ERROR;
00217     if (!test) abort_gzip();
00218     return err;
00219 }


Defines
#define	LOCSIG 0x04034b50L
#define	LOCFLG 6
#define	CRPFLG 1
#define	EXTFLG 8
#define	LOCHOW 8
#define	LOCTIM 10
#define	LOCCRC 14
#define	LOCSIZ 18
#define	LOCLEN 22
#define	LOCFIL 26
#define	LOCEXT 28
#define	LOCHDR 30
#define	EXTHDR 16
#define	RAND_HEAD_LEN 12
Functions
int	check_zipfile (int in)
int	unzip (int in, int out)
Variables
int	decrypt
char *	key
int	pkzip = 0
int	ext_header = 0

unzip.c File Reference

Defines

Functions

Variables

Define Documentation

Function Documentation

Variable Documentation