| /* minigzip.c -- simulate gzip using the zlib compression library |
| * Copyright (C) 1995-2006, 2010 Jean-loup Gailly. |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| /* |
| * minigzip is a minimal implementation of the gzip utility. This is |
| * only an example of using zlib and isn't meant to replace the |
| * full-featured gzip. No attempt is made to deal with file systems |
| * limiting names to 14 or 8+3 characters, etc... Error checking is |
| * very limited. So use minigzip only for testing; use gzip for the |
| * real thing. On MSDOS, use only on file names without extension |
| * or in pipe mode. |
| */ |
| |
| /* @(#) $Id$ */ |
| |
| #include "zlib.h" |
| #include <stdio.h> |
| |
| #ifdef STDC |
| # include <string.h> |
| # include <stdlib.h> |
| #endif |
| |
| #ifdef USE_MMAP |
| # include <sys/types.h> |
| # include <sys/mman.h> |
| # include <sys/stat.h> |
| #endif |
| |
| #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__) |
| # include <fcntl.h> |
| # include <io.h> |
| # ifdef UNDER_CE |
| # include <stdlib.h> |
| # endif |
| # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) |
| #else |
| # define SET_BINARY_MODE(file) |
| #endif |
| |
| #ifdef VMS |
| # define unlink delete |
| # define GZ_SUFFIX "-gz" |
| #endif |
| #ifdef RISCOS |
| # define unlink remove |
| # define GZ_SUFFIX "-gz" |
| # define fileno(file) file->__file |
| #endif |
| #if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os |
| # include <unix.h> /* for fileno */ |
| #endif |
| |
| #if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE) |
| #ifndef WIN32 /* unlink already in stdio.h for WIN32 */ |
| extern int unlink OF((const char *)); |
| #endif |
| #endif |
| |
| #if defined(UNDER_CE) |
| # include <windows.h> |
| # define perror(s) pwinerror(s) |
| |
| /* Map the Windows error number in ERROR to a locale-dependent error |
| message string and return a pointer to it. Typically, the values |
| for ERROR come from GetLastError. |
| |
| The string pointed to shall not be modified by the application, |
| but may be overwritten by a subsequent call to strwinerror |
| |
| The strwinerror function does not change the current setting |
| of GetLastError. */ |
| |
| static char *strwinerror (error) |
| DWORD error; |
| { |
| static char buf[1024]; |
| |
| wchar_t *msgbuf; |
| DWORD lasterr = GetLastError(); |
| DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
| | FORMAT_MESSAGE_ALLOCATE_BUFFER, |
| NULL, |
| error, |
| 0, /* Default language */ |
| (LPVOID)&msgbuf, |
| 0, |
| NULL); |
| if (chars != 0) { |
| /* If there is an \r\n appended, zap it. */ |
| if (chars >= 2 |
| && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { |
| chars -= 2; |
| msgbuf[chars] = 0; |
| } |
| |
| if (chars > sizeof (buf) - 1) { |
| chars = sizeof (buf) - 1; |
| msgbuf[chars] = 0; |
| } |
| |
| wcstombs(buf, msgbuf, chars + 1); |
| LocalFree(msgbuf); |
| } |
| else { |
| sprintf(buf, "unknown win32 error (%ld)", error); |
| } |
| |
| SetLastError(lasterr); |
| return buf; |
| } |
| |
| static void pwinerror (s) |
| const char *s; |
| { |
| if (s && *s) |
| fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ())); |
| else |
| fprintf(stderr, "%s\n", strwinerror(GetLastError ())); |
| } |
| |
| #endif /* UNDER_CE */ |
| |
| #ifndef GZ_SUFFIX |
| # define GZ_SUFFIX ".gz" |
| #endif |
| #define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1) |
| |
| #define BUFLEN 16384 |
| #define MAX_NAME_LEN 1024 |
| |
| #ifdef MAXSEG_64K |
| # define local static |
| /* Needed for systems with limitation on stack size. */ |
| #else |
| # define local |
| #endif |
| |
| char *prog; |
| |
| void error OF((const char *msg)); |
| void gz_compress OF((FILE *in, gzFile out)); |
| #ifdef USE_MMAP |
| int gz_compress_mmap OF((FILE *in, gzFile out)); |
| #endif |
| void gz_uncompress OF((gzFile in, FILE *out)); |
| void file_compress OF((char *file, char *mode)); |
| void file_uncompress OF((char *file)); |
| int main OF((int argc, char *argv[])); |
| |
| /* =========================================================================== |
| * Display error message and exit |
| */ |
| void error(msg) |
| const char *msg; |
| { |
| fprintf(stderr, "%s: %s\n", prog, msg); |
| exit(1); |
| } |
| |
| /* =========================================================================== |
| * Compress input to output then close both files. |
| */ |
| |
| void gz_compress(in, out) |
| FILE *in; |
| gzFile out; |
| { |
| local char buf[BUFLEN]; |
| int len; |
| int err; |
| |
| #ifdef USE_MMAP |
| /* Try first compressing with mmap. If mmap fails (minigzip used in a |
| * pipe), use the normal fread loop. |
| */ |
| if (gz_compress_mmap(in, out) == Z_OK) return; |
| #endif |
| for (;;) { |
| len = (int)fread(buf, 1, sizeof(buf), in); |
| if (ferror(in)) { |
| perror("fread"); |
| exit(1); |
| } |
| if (len == 0) break; |
| |
| if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err)); |
| } |
| fclose(in); |
| if (gzclose(out) != Z_OK) error("failed gzclose"); |
| } |
| |
| #ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */ |
| |
| /* Try compressing the input file at once using mmap. Return Z_OK if |
| * if success, Z_ERRNO otherwise. |
| */ |
| int gz_compress_mmap(in, out) |
| FILE *in; |
| gzFile out; |
| { |
| int len; |
| int err; |
| int ifd = fileno(in); |
| caddr_t buf; /* mmap'ed buffer for the entire input file */ |
| off_t buf_len; /* length of the input file */ |
| struct stat sb; |
| |
| /* Determine the size of the file, needed for mmap: */ |
| if (fstat(ifd, &sb) < 0) return Z_ERRNO; |
| buf_len = sb.st_size; |
| if (buf_len <= 0) return Z_ERRNO; |
| |
| /* Now do the actual mmap: */ |
| buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0); |
| if (buf == (caddr_t)(-1)) return Z_ERRNO; |
| |
| /* Compress the whole file at once: */ |
| len = gzwrite(out, (char *)buf, (unsigned)buf_len); |
| |
| if (len != (int)buf_len) error(gzerror(out, &err)); |
| |
| munmap(buf, buf_len); |
| fclose(in); |
| if (gzclose(out) != Z_OK) error("failed gzclose"); |
| return Z_OK; |
| } |
| #endif /* USE_MMAP */ |
| |
| /* =========================================================================== |
| * Uncompress input to output then close both files. |
| */ |
| void gz_uncompress(in, out) |
| gzFile in; |
| FILE *out; |
| { |
| local char buf[BUFLEN]; |
| int len; |
| int err; |
| |
| for (;;) { |
| len = gzread(in, buf, sizeof(buf)); |
| if (len < 0) error (gzerror(in, &err)); |
| if (len == 0) break; |
| |
| if ((int)fwrite(buf, 1, (unsigned)len, out) != len) { |
| error("failed fwrite"); |
| } |
| } |
| if (fclose(out)) error("failed fclose"); |
| |
| if (gzclose(in) != Z_OK) error("failed gzclose"); |
| } |
| |
| |
| /* =========================================================================== |
| * Compress the given file: create a corresponding .gz file and remove the |
| * original. |
| */ |
| void file_compress(file, mode) |
| char *file; |
| char *mode; |
| { |
| local char outfile[MAX_NAME_LEN]; |
| FILE *in; |
| gzFile out; |
| |
| if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) { |
| fprintf(stderr, "%s: filename too long\n", prog); |
| exit(1); |
| } |
| |
| strcpy(outfile, file); |
| strcat(outfile, GZ_SUFFIX); |
| |
| in = fopen(file, "rb"); |
| if (in == NULL) { |
| perror(file); |
| exit(1); |
| } |
| out = gzopen(outfile, mode); |
| if (out == NULL) { |
| fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile); |
| exit(1); |
| } |
| gz_compress(in, out); |
| |
| unlink(file); |
| } |
| |
| |
| /* =========================================================================== |
| * Uncompress the given file and remove the original. |
| */ |
| void file_uncompress(file) |
| char *file; |
| { |
| local char buf[MAX_NAME_LEN]; |
| char *infile, *outfile; |
| FILE *out; |
| gzFile in; |
| size_t len = strlen(file); |
| |
| if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) { |
| fprintf(stderr, "%s: filename too long\n", prog); |
| exit(1); |
| } |
| |
| strcpy(buf, file); |
| |
| if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) { |
| infile = file; |
| outfile = buf; |
| outfile[len-3] = '\0'; |
| } else { |
| outfile = file; |
| infile = buf; |
| strcat(infile, GZ_SUFFIX); |
| } |
| in = gzopen(infile, "rb"); |
| if (in == NULL) { |
| fprintf(stderr, "%s: can't gzopen %s\n", prog, infile); |
| exit(1); |
| } |
| out = fopen(outfile, "wb"); |
| if (out == NULL) { |
| perror(file); |
| exit(1); |
| } |
| |
| gz_uncompress(in, out); |
| |
| unlink(infile); |
| } |
| |
| |
| /* =========================================================================== |
| * Usage: minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...] |
| * -c : write to standard output |
| * -d : decompress |
| * -f : compress with Z_FILTERED |
| * -h : compress with Z_HUFFMAN_ONLY |
| * -r : compress with Z_RLE |
| * -1 to -9 : compression level |
| */ |
| |
| int main(argc, argv) |
| int argc; |
| char *argv[]; |
| { |
| int copyout = 0; |
| int uncompr = 0; |
| gzFile file; |
| char *bname, outmode[20]; |
| |
| strcpy(outmode, "wb6 "); |
| |
| prog = argv[0]; |
| bname = strrchr(argv[0], '/'); |
| if (bname) |
| bname++; |
| else |
| bname = argv[0]; |
| argc--, argv++; |
| |
| if (!strcmp(bname, "gunzip")) |
| uncompr = 1; |
| else if (!strcmp(bname, "zcat")) |
| copyout = uncompr = 1; |
| |
| while (argc > 0) { |
| if (strcmp(*argv, "-c") == 0) |
| copyout = 1; |
| else if (strcmp(*argv, "-d") == 0) |
| uncompr = 1; |
| else if (strcmp(*argv, "-f") == 0) |
| outmode[3] = 'f'; |
| else if (strcmp(*argv, "-h") == 0) |
| outmode[3] = 'h'; |
| else if (strcmp(*argv, "-r") == 0) |
| outmode[3] = 'R'; |
| else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' && |
| (*argv)[2] == 0) |
| outmode[2] = (*argv)[1]; |
| else |
| break; |
| argc--, argv++; |
| } |
| if (outmode[3] == ' ') |
| outmode[3] = 0; |
| if (argc == 0) { |
| SET_BINARY_MODE(stdin); |
| SET_BINARY_MODE(stdout); |
| if (uncompr) { |
| file = gzdopen(fileno(stdin), "rb"); |
| if (file == NULL) error("can't gzdopen stdin"); |
| gz_uncompress(file, stdout); |
| } else { |
| file = gzdopen(fileno(stdout), outmode); |
| if (file == NULL) error("can't gzdopen stdout"); |
| gz_compress(stdin, file); |
| } |
| } else { |
| if (copyout) { |
| SET_BINARY_MODE(stdout); |
| } |
| do { |
| if (uncompr) { |
| if (copyout) { |
| file = gzopen(*argv, "rb"); |
| if (file == NULL) |
| fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv); |
| else |
| gz_uncompress(file, stdout); |
| } else { |
| file_uncompress(*argv); |
| } |
| } else { |
| if (copyout) { |
| FILE * in = fopen(*argv, "rb"); |
| |
| if (in == NULL) { |
| perror(*argv); |
| } else { |
| file = gzdopen(fileno(stdout), outmode); |
| if (file == NULL) error("can't gzdopen stdout"); |
| |
| gz_compress(in, file); |
| } |
| |
| } else { |
| file_compress(*argv, outmode); |
| } |
| } |
| } while (argv++, --argc); |
| } |
| return 0; |
| } |