| /* gun.c -- simple gunzip to give an example of the use of inflateBack() |
| * Copyright (C) 2003, 2005, 2008, 2010, 2012 Mark Adler |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| Version 1.7 12 August 2012 Mark Adler */ |
| |
| /* Version history: |
| 1.0 16 Feb 2003 First version for testing of inflateBack() |
| 1.1 21 Feb 2005 Decompress concatenated gzip streams |
| Remove use of "this" variable (C++ keyword) |
| Fix return value for in() |
| Improve allocation failure checking |
| Add typecasting for void * structures |
| Add -h option for command version and usage |
| Add a bunch of comments |
| 1.2 20 Mar 2005 Add Unix compress (LZW) decompression |
| Copy file attributes from input file to output file |
| 1.3 12 Jun 2005 Add casts for error messages [Oberhumer] |
| 1.4 8 Dec 2006 LZW decompression speed improvements |
| 1.5 9 Feb 2008 Avoid warning in latest version of gcc |
| 1.6 17 Jan 2010 Avoid signed/unsigned comparison warnings |
| 1.7 12 Aug 2012 Update for z_const usage in zlib 1.2.8 |
| */ |
| |
| /* |
| gun [ -t ] [ name ... ] |
| |
| decompresses the data in the named gzip files. If no arguments are given, |
| gun will decompress from stdin to stdout. The names must end in .gz, -gz, |
| .z, -z, _z, or .Z. The uncompressed data will be written to a file name |
| with the suffix stripped. On success, the original file is deleted. On |
| failure, the output file is deleted. For most failures, the command will |
| continue to process the remaining names on the command line. A memory |
| allocation failure will abort the command. If -t is specified, then the |
| listed files or stdin will be tested as gzip files for integrity (without |
| checking for a proper suffix), no output will be written, and no files |
| will be deleted. |
| |
| Like gzip, gun allows concatenated gzip streams and will decompress them, |
| writing all of the uncompressed data to the output. Unlike gzip, gun allows |
| an empty file on input, and will produce no error writing an empty output |
| file. |
| |
| gun will also decompress files made by Unix compress, which uses LZW |
| compression. These files are automatically detected by virtue of their |
| magic header bytes. Since the end of Unix compress stream is marked by the |
| end-of-file, they cannot be concantenated. If a Unix compress stream is |
| encountered in an input file, it is the last stream in that file. |
| |
| Like gunzip and uncompress, the file attributes of the original compressed |
| file are maintained in the final uncompressed file, to the extent that the |
| user permissions allow it. |
| |
| On my Mac OS X PowerPC G4, gun is almost twice as fast as gunzip (version |
| 1.2.4) is on the same file, when gun is linked with zlib 1.2.2. Also the |
| LZW decompression provided by gun is about twice as fast as the standard |
| Unix uncompress command. |
| */ |
| |
| /* external functions and related types and constants */ |
| #include <stdio.h> /* fprintf() */ |
| #include <stdlib.h> /* malloc(), free() */ |
| #include <string.h> /* strerror(), strcmp(), strlen(), memcpy() */ |
| #include <errno.h> /* errno */ |
| #include <fcntl.h> /* open() */ |
| #include <unistd.h> /* read(), write(), close(), chown(), unlink() */ |
| #include <sys/types.h> |
| #include <sys/stat.h> /* stat(), chmod() */ |
| #include <utime.h> /* utime() */ |
| #include "zlib.h" /* inflateBackInit(), inflateBack(), */ |
| /* inflateBackEnd(), crc32() */ |
| |
| /* function declaration */ |
| #define local static |
| |
| /* buffer constants */ |
| #define SIZE 32768U /* input and output buffer sizes */ |
| #define PIECE 16384 /* limits i/o chunks for 16-bit int case */ |
| |
| /* structure for infback() to pass to input function in() -- it maintains the |
| input file and a buffer of size SIZE */ |
| struct ind { |
| int infile; |
| unsigned char *inbuf; |
| }; |
| |
| /* Load input buffer, assumed to be empty, and return bytes loaded and a |
| pointer to them. read() is called until the buffer is full, or until it |
| returns end-of-file or error. Return 0 on error. */ |
| local unsigned in(void *in_desc, z_const unsigned char **buf) |
| { |
| int ret; |
| unsigned len; |
| unsigned char *next; |
| struct ind *me = (struct ind *)in_desc; |
| |
| next = me->inbuf; |
| *buf = next; |
| len = 0; |
| do { |
| ret = PIECE; |
| if ((unsigned)ret > SIZE - len) |
| ret = (int)(SIZE - len); |
| ret = (int)read(me->infile, next, ret); |
| if (ret == -1) { |
| len = 0; |
| break; |
| } |
| next += ret; |
| len += ret; |
| } while (ret != 0 && len < SIZE); |
| return len; |
| } |
| |
| /* structure for infback() to pass to output function out() -- it maintains the |
| output file, a running CRC-32 check on the output and the total number of |
| bytes output, both for checking against the gzip trailer. (The length in |
| the gzip trailer is stored modulo 2^32, so it's ok if a long is 32 bits and |
| the output is greater than 4 GB.) */ |
| struct outd { |
| int outfile; |
| int check; /* true if checking crc and total */ |
| unsigned long crc; |
| unsigned long total; |
| }; |
| |
| /* Write output buffer and update the CRC-32 and total bytes written. write() |
| is called until all of the output is written or an error is encountered. |
| On success out() returns 0. For a write failure, out() returns 1. If the |
| output file descriptor is -1, then nothing is written. |
| */ |
| local int out(void *out_desc, unsigned char *buf, unsigned len) |
| { |
| int ret; |
| struct outd *me = (struct outd *)out_desc; |
| |
| if (me->check) { |
| me->crc = crc32(me->crc, buf, len); |
| me->total += len; |
| } |
| if (me->outfile != -1) |
| do { |
| ret = PIECE; |
| if ((unsigned)ret > len) |
| ret = (int)len; |
| ret = (int)write(me->outfile, buf, ret); |
| if (ret == -1) |
| return 1; |
| buf += ret; |
| len -= ret; |
| } while (len != 0); |
| return 0; |
| } |
| |
| /* next input byte macro for use inside lunpipe() and gunpipe() */ |
| #define NEXT() (have ? 0 : (have = in(indp, &next)), \ |
| last = have ? (have--, (int)(*next++)) : -1) |
| |
| /* memory for gunpipe() and lunpipe() -- |
| the first 256 entries of prefix[] and suffix[] are never used, could |
| have offset the index, but it's faster to waste the memory */ |
| unsigned char inbuf[SIZE]; /* input buffer */ |
| unsigned char outbuf[SIZE]; /* output buffer */ |
| unsigned short prefix[65536]; /* index to LZW prefix string */ |
| unsigned char suffix[65536]; /* one-character LZW suffix */ |
| unsigned char match[65280 + 2]; /* buffer for reversed match or gzip |
| 32K sliding window */ |
| |
| /* throw out what's left in the current bits byte buffer (this is a vestigial |
| aspect of the compressed data format derived from an implementation that |
| made use of a special VAX machine instruction!) */ |
| #define FLUSHCODE() \ |
| do { \ |
| left = 0; \ |
| rem = 0; \ |
| if (chunk > have) { \ |
| chunk -= have; \ |
| have = 0; \ |
| if (NEXT() == -1) \ |
| break; \ |
| chunk--; \ |
| if (chunk > have) { \ |
| chunk = have = 0; \ |
| break; \ |
| } \ |
| } \ |
| have -= chunk; \ |
| next += chunk; \ |
| chunk = 0; \ |
| } while (0) |
| |
| /* Decompress a compress (LZW) file from indp to outfile. The compress magic |
| header (two bytes) has already been read and verified. There are have bytes |
| of buffered input at next. strm is used for passing error information back |
| to gunpipe(). |
| |
| lunpipe() will return Z_OK on success, Z_BUF_ERROR for an unexpected end of |
| file, read error, or write error (a write error indicated by strm->next_in |
| not equal to Z_NULL), or Z_DATA_ERROR for invalid input. |
| */ |
| local int lunpipe(unsigned have, z_const unsigned char *next, struct ind *indp, |
| int outfile, z_stream *strm) |
| { |
| int last; /* last byte read by NEXT(), or -1 if EOF */ |
| unsigned chunk; /* bytes left in current chunk */ |
| int left; /* bits left in rem */ |
| unsigned rem; /* unused bits from input */ |
| int bits; /* current bits per code */ |
| unsigned code; /* code, table traversal index */ |
| unsigned mask; /* mask for current bits codes */ |
| int max; /* maximum bits per code for this stream */ |
| unsigned flags; /* compress flags, then block compress flag */ |
| unsigned end; /* last valid entry in prefix/suffix tables */ |
| unsigned temp; /* current code */ |
| unsigned prev; /* previous code */ |
| unsigned final; /* last character written for previous code */ |
| unsigned stack; /* next position for reversed string */ |
| unsigned outcnt; /* bytes in output buffer */ |
| struct outd outd; /* output structure */ |
| unsigned char *p; |
| |
| /* set up output */ |
| outd.outfile = outfile; |
| outd.check = 0; |
| |
| /* process remainder of compress header -- a flags byte */ |
| flags = NEXT(); |
| if (last == -1) |
| return Z_BUF_ERROR; |
| if (flags & 0x60) { |
| strm->msg = (char *)"unknown lzw flags set"; |
| return Z_DATA_ERROR; |
| } |
| max = flags & 0x1f; |
| if (max < 9 || max > 16) { |
| strm->msg = (char *)"lzw bits out of range"; |
| return Z_DATA_ERROR; |
| } |
| if (max == 9) /* 9 doesn't really mean 9 */ |
| max = 10; |
| flags &= 0x80; /* true if block compress */ |
| |
| /* clear table */ |
| bits = 9; |
| mask = 0x1ff; |
| end = flags ? 256 : 255; |
| |
| /* set up: get first 9-bit code, which is the first decompressed byte, but |
| don't create a table entry until the next code */ |
| if (NEXT() == -1) /* no compressed data is ok */ |
| return Z_OK; |
| final = prev = (unsigned)last; /* low 8 bits of code */ |
| if (NEXT() == -1) /* missing a bit */ |
| return Z_BUF_ERROR; |
| if (last & 1) { /* code must be < 256 */ |
| strm->msg = (char *)"invalid lzw code"; |
| return Z_DATA_ERROR; |
| } |
| rem = (unsigned)last >> 1; /* remaining 7 bits */ |
| left = 7; |
| chunk = bits - 2; /* 7 bytes left in this chunk */ |
| outbuf[0] = (unsigned char)final; /* write first decompressed byte */ |
| outcnt = 1; |
| |
| /* decode codes */ |
| stack = 0; |
| for (;;) { |
| /* if the table will be full after this, increment the code size */ |
| if (end >= mask && bits < max) { |
| FLUSHCODE(); |
| bits++; |
| mask <<= 1; |
| mask++; |
| } |
| |
| /* get a code of length bits */ |
| if (chunk == 0) /* decrement chunk modulo bits */ |
| chunk = bits; |
| code = rem; /* low bits of code */ |
| if (NEXT() == -1) { /* EOF is end of compressed data */ |
| /* write remaining buffered output */ |
| if (outcnt && out(&outd, outbuf, outcnt)) { |
| strm->next_in = outbuf; /* signal write error */ |
| return Z_BUF_ERROR; |
| } |
| return Z_OK; |
| } |
| code += (unsigned)last << left; /* middle (or high) bits of code */ |
| left += 8; |
| chunk--; |
| if (bits > left) { /* need more bits */ |
| if (NEXT() == -1) /* can't end in middle of code */ |
| return Z_BUF_ERROR; |
| code += (unsigned)last << left; /* high bits of code */ |
| left += 8; |
| chunk--; |
| } |
| code &= mask; /* mask to current code length */ |
| left -= bits; /* number of unused bits */ |
| rem = (unsigned)last >> (8 - left); /* unused bits from last byte */ |
| |
| /* process clear code (256) */ |
| if (code == 256 && flags) { |
| FLUSHCODE(); |
| bits = 9; /* initialize bits and mask */ |
| mask = 0x1ff; |
| end = 255; /* empty table */ |
| continue; /* get next code */ |
| } |
| |
| /* special code to reuse last match */ |
| temp = code; /* save the current code */ |
| if (code > end) { |
| /* Be picky on the allowed code here, and make sure that the code |
| we drop through (prev) will be a valid index so that random |
| input does not cause an exception. The code != end + 1 check is |
| empirically derived, and not checked in the original uncompress |
| code. If this ever causes a problem, that check could be safely |
| removed. Leaving this check in greatly improves gun's ability |
| to detect random or corrupted input after a compress header. |
| In any case, the prev > end check must be retained. */ |
| if (code != end + 1 || prev > end) { |
| strm->msg = (char *)"invalid lzw code"; |
| return Z_DATA_ERROR; |
| } |
| match[stack++] = (unsigned char)final; |
| code = prev; |
| } |
| |
| /* walk through linked list to generate output in reverse order */ |
| p = match + stack; |
| while (code >= 256) { |
| *p++ = suffix[code]; |
| code = prefix[code]; |
| } |
| stack = p - match; |
| match[stack++] = (unsigned char)code; |
| final = code; |
| |
| /* link new table entry */ |
| if (end < mask) { |
| end++; |
| prefix[end] = (unsigned short)prev; |
| suffix[end] = (unsigned char)final; |
| } |
| |
| /* set previous code for next iteration */ |
| prev = temp; |
| |
| /* write output in forward order */ |
| while (stack > SIZE - outcnt) { |
| while (outcnt < SIZE) |
| outbuf[outcnt++] = match[--stack]; |
| if (out(&outd, outbuf, outcnt)) { |
| strm->next_in = outbuf; /* signal write error */ |
| return Z_BUF_ERROR; |
| } |
| outcnt = 0; |
| } |
| p = match + stack; |
| do { |
| outbuf[outcnt++] = *--p; |
| } while (p > match); |
| stack = 0; |
| |
| /* loop for next code with final and prev as the last match, rem and |
| left provide the first 0..7 bits of the next code, end is the last |
| valid table entry */ |
| } |
| } |
| |
| /* Decompress a gzip file from infile to outfile. strm is assumed to have been |
| successfully initialized with inflateBackInit(). The input file may consist |
| of a series of gzip streams, in which case all of them will be decompressed |
| to the output file. If outfile is -1, then the gzip stream(s) integrity is |
| checked and nothing is written. |
| |
| The return value is a zlib error code: Z_MEM_ERROR if out of memory, |
| Z_DATA_ERROR if the header or the compressed data is invalid, or if the |
| trailer CRC-32 check or length doesn't match, Z_BUF_ERROR if the input ends |
| prematurely or a write error occurs, or Z_ERRNO if junk (not a another gzip |
| stream) follows a valid gzip stream. |
| */ |
| local int gunpipe(z_stream *strm, int infile, int outfile) |
| { |
| int ret, first, last; |
| unsigned have, flags, len; |
| z_const unsigned char *next = NULL; |
| struct ind ind, *indp; |
| struct outd outd; |
| |
| /* setup input buffer */ |
| ind.infile = infile; |
| ind.inbuf = inbuf; |
| indp = &ind; |
| |
| /* decompress concatenated gzip streams */ |
| have = 0; /* no input data read in yet */ |
| first = 1; /* looking for first gzip header */ |
| strm->next_in = Z_NULL; /* so Z_BUF_ERROR means EOF */ |
| for (;;) { |
| /* look for the two magic header bytes for a gzip stream */ |
| if (NEXT() == -1) { |
| ret = Z_OK; |
| break; /* empty gzip stream is ok */ |
| } |
| if (last != 31 || (NEXT() != 139 && last != 157)) { |
| strm->msg = (char *)"incorrect header check"; |
| ret = first ? Z_DATA_ERROR : Z_ERRNO; |
| break; /* not a gzip or compress header */ |
| } |
| first = 0; /* next non-header is junk */ |
| |
| /* process a compress (LZW) file -- can't be concatenated after this */ |
| if (last == 157) { |
| ret = lunpipe(have, next, indp, outfile, strm); |
| break; |
| } |
| |
| /* process remainder of gzip header */ |
| ret = Z_BUF_ERROR; |
| if (NEXT() != 8) { /* only deflate method allowed */ |
| if (last == -1) break; |
| strm->msg = (char *)"unknown compression method"; |
| ret = Z_DATA_ERROR; |
| break; |
| } |
| flags = NEXT(); /* header flags */ |
| NEXT(); /* discard mod time, xflgs, os */ |
| NEXT(); |
| NEXT(); |
| NEXT(); |
| NEXT(); |
| NEXT(); |
| if (last == -1) break; |
| if (flags & 0xe0) { |
| strm->msg = (char *)"unknown header flags set"; |
| ret = Z_DATA_ERROR; |
| break; |
| } |
| if (flags & 4) { /* extra field */ |
| len = NEXT(); |
| len += (unsigned)(NEXT()) << 8; |
| if (last == -1) break; |
| while (len > have) { |
| len -= have; |
| have = 0; |
| if (NEXT() == -1) break; |
| len--; |
| } |
| if (last == -1) break; |
| have -= len; |
| next += len; |
| } |
| if (flags & 8) /* file name */ |
| while (NEXT() != 0 && last != -1) |
| ; |
| if (flags & 16) /* comment */ |
| while (NEXT() != 0 && last != -1) |
| ; |
| if (flags & 2) { /* header crc */ |
| NEXT(); |
| NEXT(); |
| } |
| if (last == -1) break; |
| |
| /* set up output */ |
| outd.outfile = outfile; |
| outd.check = 1; |
| outd.crc = crc32(0L, Z_NULL, 0); |
| outd.total = 0; |
| |
| /* decompress data to output */ |
| strm->next_in = next; |
| strm->avail_in = have; |
| ret = inflateBack(strm, in, indp, out, &outd); |
| if (ret != Z_STREAM_END) break; |
| next = strm->next_in; |
| have = strm->avail_in; |
| strm->next_in = Z_NULL; /* so Z_BUF_ERROR means EOF */ |
| |
| /* check trailer */ |
| ret = Z_BUF_ERROR; |
| if (NEXT() != (int)(outd.crc & 0xff) || |
| NEXT() != (int)((outd.crc >> 8) & 0xff) || |
| NEXT() != (int)((outd.crc >> 16) & 0xff) || |
| NEXT() != (int)((outd.crc >> 24) & 0xff)) { |
| /* crc error */ |
| if (last != -1) { |
| strm->msg = (char *)"incorrect data check"; |
| ret = Z_DATA_ERROR; |
| } |
| break; |
| } |
| if (NEXT() != (int)(outd.total & 0xff) || |
| NEXT() != (int)((outd.total >> 8) & 0xff) || |
| NEXT() != (int)((outd.total >> 16) & 0xff) || |
| NEXT() != (int)((outd.total >> 24) & 0xff)) { |
| /* length error */ |
| if (last != -1) { |
| strm->msg = (char *)"incorrect length check"; |
| ret = Z_DATA_ERROR; |
| } |
| break; |
| } |
| |
| /* go back and look for another gzip stream */ |
| } |
| |
| /* clean up and return */ |
| return ret; |
| } |
| |
| /* Copy file attributes, from -> to, as best we can. This is best effort, so |
| no errors are reported. The mode bits, including suid, sgid, and the sticky |
| bit are copied (if allowed), the owner's user id and group id are copied |
| (again if allowed), and the access and modify times are copied. */ |
| local void copymeta(char *from, char *to) |
| { |
| struct stat was; |
| struct utimbuf when; |
| |
| /* get all of from's Unix meta data, return if not a regular file */ |
| if (stat(from, &was) != 0 || (was.st_mode & S_IFMT) != S_IFREG) |
| return; |
| |
| /* set to's mode bits, ignore errors */ |
| (void)chmod(to, was.st_mode & 07777); |
| |
| /* copy owner's user and group, ignore errors */ |
| (void)chown(to, was.st_uid, was.st_gid); |
| |
| /* copy access and modify times, ignore errors */ |
| when.actime = was.st_atime; |
| when.modtime = was.st_mtime; |
| (void)utime(to, &when); |
| } |
| |
| /* Decompress the file inname to the file outnname, of if test is true, just |
| decompress without writing and check the gzip trailer for integrity. If |
| inname is NULL or an empty string, read from stdin. If outname is NULL or |
| an empty string, write to stdout. strm is a pre-initialized inflateBack |
| structure. When appropriate, copy the file attributes from inname to |
| outname. |
| |
| gunzip() returns 1 if there is an out-of-memory error or an unexpected |
| return code from gunpipe(). Otherwise it returns 0. |
| */ |
| local int gunzip(z_stream *strm, char *inname, char *outname, int test) |
| { |
| int ret; |
| int infile, outfile; |
| |
| /* open files */ |
| if (inname == NULL || *inname == 0) { |
| inname = "-"; |
| infile = 0; /* stdin */ |
| } |
| else { |
| infile = open(inname, O_RDONLY, 0); |
| if (infile == -1) { |
| fprintf(stderr, "gun cannot open %s\n", inname); |
| return 0; |
| } |
| } |
| if (test) |
| outfile = -1; |
| else if (outname == NULL || *outname == 0) { |
| outname = "-"; |
| outfile = 1; /* stdout */ |
| } |
| else { |
| outfile = open(outname, O_CREAT | O_TRUNC | O_WRONLY, 0666); |
| if (outfile == -1) { |
| close(infile); |
| fprintf(stderr, "gun cannot create %s\n", outname); |
| return 0; |
| } |
| } |
| errno = 0; |
| |
| /* decompress */ |
| ret = gunpipe(strm, infile, outfile); |
| if (outfile > 2) close(outfile); |
| if (infile > 2) close(infile); |
| |
| /* interpret result */ |
| switch (ret) { |
| case Z_OK: |
| case Z_ERRNO: |
| if (infile > 2 && outfile > 2) { |
| copymeta(inname, outname); /* copy attributes */ |
| unlink(inname); |
| } |
| if (ret == Z_ERRNO) |
| fprintf(stderr, "gun warning: trailing garbage ignored in %s\n", |
| inname); |
| break; |
| case Z_DATA_ERROR: |
| if (outfile > 2) unlink(outname); |
| fprintf(stderr, "gun data error on %s: %s\n", inname, strm->msg); |
| break; |
| case Z_MEM_ERROR: |
| if (outfile > 2) unlink(outname); |
| fprintf(stderr, "gun out of memory error--aborting\n"); |
| return 1; |
| case Z_BUF_ERROR: |
| if (outfile > 2) unlink(outname); |
| if (strm->next_in != Z_NULL) { |
| fprintf(stderr, "gun write error on %s: %s\n", |
| outname, strerror(errno)); |
| } |
| else if (errno) { |
| fprintf(stderr, "gun read error on %s: %s\n", |
| inname, strerror(errno)); |
| } |
| else { |
| fprintf(stderr, "gun unexpected end of file on %s\n", |
| inname); |
| } |
| break; |
| default: |
| if (outfile > 2) unlink(outname); |
| fprintf(stderr, "gun internal error--aborting\n"); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* Process the gun command line arguments. See the command syntax near the |
| beginning of this source file. */ |
| int main(int argc, char **argv) |
| { |
| int ret, len, test; |
| char *outname; |
| unsigned char *window; |
| z_stream strm; |
| |
| /* initialize inflateBack state for repeated use */ |
| window = match; /* reuse LZW match buffer */ |
| strm.zalloc = Z_NULL; |
| strm.zfree = Z_NULL; |
| strm.opaque = Z_NULL; |
| ret = inflateBackInit(&strm, 15, window); |
| if (ret != Z_OK) { |
| fprintf(stderr, "gun out of memory error--aborting\n"); |
| return 1; |
| } |
| |
| /* decompress each file to the same name with the suffix removed */ |
| argc--; |
| argv++; |
| test = 0; |
| if (argc && strcmp(*argv, "-h") == 0) { |
| fprintf(stderr, "gun 1.6 (17 Jan 2010)\n"); |
| fprintf(stderr, "Copyright (C) 2003-2010 Mark Adler\n"); |
| fprintf(stderr, "usage: gun [-t] [file1.gz [file2.Z ...]]\n"); |
| return 0; |
| } |
| if (argc && strcmp(*argv, "-t") == 0) { |
| test = 1; |
| argc--; |
| argv++; |
| } |
| if (argc) |
| do { |
| if (test) |
| outname = NULL; |
| else { |
| len = (int)strlen(*argv); |
| if (strcmp(*argv + len - 3, ".gz") == 0 || |
| strcmp(*argv + len - 3, "-gz") == 0) |
| len -= 3; |
| else if (strcmp(*argv + len - 2, ".z") == 0 || |
| strcmp(*argv + len - 2, "-z") == 0 || |
| strcmp(*argv + len - 2, "_z") == 0 || |
| strcmp(*argv + len - 2, ".Z") == 0) |
| len -= 2; |
| else { |
| fprintf(stderr, "gun error: no gz type on %s--skipping\n", |
| *argv); |
| continue; |
| } |
| outname = malloc(len + 1); |
| if (outname == NULL) { |
| fprintf(stderr, "gun out of memory error--aborting\n"); |
| ret = 1; |
| break; |
| } |
| memcpy(outname, *argv, len); |
| outname[len] = 0; |
| } |
| ret = gunzip(&strm, *argv, outname, test); |
| if (outname != NULL) free(outname); |
| if (ret) break; |
| } while (argv++, --argc); |
| else |
| ret = gunzip(&strm, NULL, NULL, test); |
| |
| /* clean up */ |
| inflateBackEnd(&strm); |
| return ret; |
| } |
