cannam@89: /* minigzip.c -- simulate gzip using the zlib compression library cannam@89: * Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly. cannam@89: * For conditions of distribution and use, see copyright notice in zlib.h cannam@89: */ cannam@89: cannam@89: /* cannam@89: * minigzip is a minimal implementation of the gzip utility. This is cannam@89: * only an example of using zlib and isn't meant to replace the cannam@89: * full-featured gzip. No attempt is made to deal with file systems cannam@89: * limiting names to 14 or 8+3 characters, etc... Error checking is cannam@89: * very limited. So use minigzip only for testing; use gzip for the cannam@89: * real thing. On MSDOS, use only on file names without extension cannam@89: * or in pipe mode. cannam@89: */ cannam@89: cannam@89: /* @(#) $Id$ */ cannam@89: cannam@89: #include "zlib.h" cannam@89: #include cannam@89: cannam@89: #ifdef STDC cannam@89: # include cannam@89: # include cannam@89: #endif cannam@89: cannam@89: #ifdef USE_MMAP cannam@89: # include cannam@89: # include cannam@89: # include cannam@89: #endif cannam@89: cannam@89: #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__) cannam@89: # include cannam@89: # include cannam@89: # ifdef UNDER_CE cannam@89: # include cannam@89: # endif cannam@89: # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) cannam@89: #else cannam@89: # define SET_BINARY_MODE(file) cannam@89: #endif cannam@89: cannam@89: #ifdef VMS cannam@89: # define unlink delete cannam@89: # define GZ_SUFFIX "-gz" cannam@89: #endif cannam@89: #ifdef RISCOS cannam@89: # define unlink remove cannam@89: # define GZ_SUFFIX "-gz" cannam@89: # define fileno(file) file->__file cannam@89: #endif cannam@89: #if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os cannam@89: # include /* for fileno */ cannam@89: #endif cannam@89: cannam@89: #if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE) cannam@89: #ifndef WIN32 /* unlink already in stdio.h for WIN32 */ cannam@89: extern int unlink OF((const char *)); cannam@89: #endif cannam@89: #endif cannam@89: cannam@89: #if defined(UNDER_CE) cannam@89: # include cannam@89: # define perror(s) pwinerror(s) cannam@89: cannam@89: /* Map the Windows error number in ERROR to a locale-dependent error cannam@89: message string and return a pointer to it. Typically, the values cannam@89: for ERROR come from GetLastError. cannam@89: cannam@89: The string pointed to shall not be modified by the application, cannam@89: but may be overwritten by a subsequent call to strwinerror cannam@89: cannam@89: The strwinerror function does not change the current setting cannam@89: of GetLastError. */ cannam@89: cannam@89: static char *strwinerror (error) cannam@89: DWORD error; cannam@89: { cannam@89: static char buf[1024]; cannam@89: cannam@89: wchar_t *msgbuf; cannam@89: DWORD lasterr = GetLastError(); cannam@89: DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM cannam@89: | FORMAT_MESSAGE_ALLOCATE_BUFFER, cannam@89: NULL, cannam@89: error, cannam@89: 0, /* Default language */ cannam@89: (LPVOID)&msgbuf, cannam@89: 0, cannam@89: NULL); cannam@89: if (chars != 0) { cannam@89: /* If there is an \r\n appended, zap it. */ cannam@89: if (chars >= 2 cannam@89: && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { cannam@89: chars -= 2; cannam@89: msgbuf[chars] = 0; cannam@89: } cannam@89: cannam@89: if (chars > sizeof (buf) - 1) { cannam@89: chars = sizeof (buf) - 1; cannam@89: msgbuf[chars] = 0; cannam@89: } cannam@89: cannam@89: wcstombs(buf, msgbuf, chars + 1); cannam@89: LocalFree(msgbuf); cannam@89: } cannam@89: else { cannam@89: sprintf(buf, "unknown win32 error (%ld)", error); cannam@89: } cannam@89: cannam@89: SetLastError(lasterr); cannam@89: return buf; cannam@89: } cannam@89: cannam@89: static void pwinerror (s) cannam@89: const char *s; cannam@89: { cannam@89: if (s && *s) cannam@89: fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ())); cannam@89: else cannam@89: fprintf(stderr, "%s\n", strwinerror(GetLastError ())); cannam@89: } cannam@89: cannam@89: #endif /* UNDER_CE */ cannam@89: cannam@89: #ifndef GZ_SUFFIX cannam@89: # define GZ_SUFFIX ".gz" cannam@89: #endif cannam@89: #define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1) cannam@89: cannam@89: #define BUFLEN 16384 cannam@89: #define MAX_NAME_LEN 1024 cannam@89: cannam@89: #ifdef MAXSEG_64K cannam@89: # define local static cannam@89: /* Needed for systems with limitation on stack size. */ cannam@89: #else cannam@89: # define local cannam@89: #endif cannam@89: cannam@89: #ifdef Z_SOLO cannam@89: /* for Z_SOLO, create simplified gz* functions using deflate and inflate */ cannam@89: cannam@89: #if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE) cannam@89: # include /* for unlink() */ cannam@89: #endif cannam@89: cannam@89: void *myalloc OF((void *, unsigned, unsigned)); cannam@89: void myfree OF((void *, void *)); cannam@89: cannam@89: void *myalloc(q, n, m) cannam@89: void *q; cannam@89: unsigned n, m; cannam@89: { cannam@89: q = Z_NULL; cannam@89: return calloc(n, m); cannam@89: } cannam@89: cannam@89: void myfree(q, p) cannam@89: void *q, *p; cannam@89: { cannam@89: q = Z_NULL; cannam@89: free(p); cannam@89: } cannam@89: cannam@89: typedef struct gzFile_s { cannam@89: FILE *file; cannam@89: int write; cannam@89: int err; cannam@89: char *msg; cannam@89: z_stream strm; cannam@89: } *gzFile; cannam@89: cannam@89: gzFile gzopen OF((const char *, const char *)); cannam@89: gzFile gzdopen OF((int, const char *)); cannam@89: gzFile gz_open OF((const char *, int, const char *)); cannam@89: cannam@89: gzFile gzopen(path, mode) cannam@89: const char *path; cannam@89: const char *mode; cannam@89: { cannam@89: return gz_open(path, -1, mode); cannam@89: } cannam@89: cannam@89: gzFile gzdopen(fd, mode) cannam@89: int fd; cannam@89: const char *mode; cannam@89: { cannam@89: return gz_open(NULL, fd, mode); cannam@89: } cannam@89: cannam@89: gzFile gz_open(path, fd, mode) cannam@89: const char *path; cannam@89: int fd; cannam@89: const char *mode; cannam@89: { cannam@89: gzFile gz; cannam@89: int ret; cannam@89: cannam@89: gz = malloc(sizeof(struct gzFile_s)); cannam@89: if (gz == NULL) cannam@89: return NULL; cannam@89: gz->write = strchr(mode, 'w') != NULL; cannam@89: gz->strm.zalloc = myalloc; cannam@89: gz->strm.zfree = myfree; cannam@89: gz->strm.opaque = Z_NULL; cannam@89: if (gz->write) cannam@89: ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0); cannam@89: else { cannam@89: gz->strm.next_in = 0; cannam@89: gz->strm.avail_in = Z_NULL; cannam@89: ret = inflateInit2(&(gz->strm), 15 + 16); cannam@89: } cannam@89: if (ret != Z_OK) { cannam@89: free(gz); cannam@89: return NULL; cannam@89: } cannam@89: gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") : cannam@89: fopen(path, gz->write ? "wb" : "rb"); cannam@89: if (gz->file == NULL) { cannam@89: gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm)); cannam@89: free(gz); cannam@89: return NULL; cannam@89: } cannam@89: gz->err = 0; cannam@89: gz->msg = ""; cannam@89: return gz; cannam@89: } cannam@89: cannam@89: int gzwrite OF((gzFile, const void *, unsigned)); cannam@89: cannam@89: int gzwrite(gz, buf, len) cannam@89: gzFile gz; cannam@89: const void *buf; cannam@89: unsigned len; cannam@89: { cannam@89: z_stream *strm; cannam@89: unsigned char out[BUFLEN]; cannam@89: cannam@89: if (gz == NULL || !gz->write) cannam@89: return 0; cannam@89: strm = &(gz->strm); cannam@89: strm->next_in = (void *)buf; cannam@89: strm->avail_in = len; cannam@89: do { cannam@89: strm->next_out = out; cannam@89: strm->avail_out = BUFLEN; cannam@89: (void)deflate(strm, Z_NO_FLUSH); cannam@89: fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); cannam@89: } while (strm->avail_out == 0); cannam@89: return len; cannam@89: } cannam@89: cannam@89: int gzread OF((gzFile, void *, unsigned)); cannam@89: cannam@89: int gzread(gz, buf, len) cannam@89: gzFile gz; cannam@89: void *buf; cannam@89: unsigned len; cannam@89: { cannam@89: int ret; cannam@89: unsigned got; cannam@89: unsigned char in[1]; cannam@89: z_stream *strm; cannam@89: cannam@89: if (gz == NULL || gz->write) cannam@89: return 0; cannam@89: if (gz->err) cannam@89: return 0; cannam@89: strm = &(gz->strm); cannam@89: strm->next_out = (void *)buf; cannam@89: strm->avail_out = len; cannam@89: do { cannam@89: got = fread(in, 1, 1, gz->file); cannam@89: if (got == 0) cannam@89: break; cannam@89: strm->next_in = in; cannam@89: strm->avail_in = 1; cannam@89: ret = inflate(strm, Z_NO_FLUSH); cannam@89: if (ret == Z_DATA_ERROR) { cannam@89: gz->err = Z_DATA_ERROR; cannam@89: gz->msg = strm->msg; cannam@89: return 0; cannam@89: } cannam@89: if (ret == Z_STREAM_END) cannam@89: inflateReset(strm); cannam@89: } while (strm->avail_out); cannam@89: return len - strm->avail_out; cannam@89: } cannam@89: cannam@89: int gzclose OF((gzFile)); cannam@89: cannam@89: int gzclose(gz) cannam@89: gzFile gz; cannam@89: { cannam@89: z_stream *strm; cannam@89: unsigned char out[BUFLEN]; cannam@89: cannam@89: if (gz == NULL) cannam@89: return Z_STREAM_ERROR; cannam@89: strm = &(gz->strm); cannam@89: if (gz->write) { cannam@89: strm->next_in = Z_NULL; cannam@89: strm->avail_in = 0; cannam@89: do { cannam@89: strm->next_out = out; cannam@89: strm->avail_out = BUFLEN; cannam@89: (void)deflate(strm, Z_FINISH); cannam@89: fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); cannam@89: } while (strm->avail_out == 0); cannam@89: deflateEnd(strm); cannam@89: } cannam@89: else cannam@89: inflateEnd(strm); cannam@89: fclose(gz->file); cannam@89: free(gz); cannam@89: return Z_OK; cannam@89: } cannam@89: cannam@89: const char *gzerror OF((gzFile, int *)); cannam@89: cannam@89: const char *gzerror(gz, err) cannam@89: gzFile gz; cannam@89: int *err; cannam@89: { cannam@89: *err = gz->err; cannam@89: return gz->msg; cannam@89: } cannam@89: cannam@89: #endif cannam@89: cannam@89: char *prog; cannam@89: cannam@89: void error OF((const char *msg)); cannam@89: void gz_compress OF((FILE *in, gzFile out)); cannam@89: #ifdef USE_MMAP cannam@89: int gz_compress_mmap OF((FILE *in, gzFile out)); cannam@89: #endif cannam@89: void gz_uncompress OF((gzFile in, FILE *out)); cannam@89: void file_compress OF((char *file, char *mode)); cannam@89: void file_uncompress OF((char *file)); cannam@89: int main OF((int argc, char *argv[])); cannam@89: cannam@89: /* =========================================================================== cannam@89: * Display error message and exit cannam@89: */ cannam@89: void error(msg) cannam@89: const char *msg; cannam@89: { cannam@89: fprintf(stderr, "%s: %s\n", prog, msg); cannam@89: exit(1); cannam@89: } cannam@89: cannam@89: /* =========================================================================== cannam@89: * Compress input to output then close both files. cannam@89: */ cannam@89: cannam@89: void gz_compress(in, out) cannam@89: FILE *in; cannam@89: gzFile out; cannam@89: { cannam@89: local char buf[BUFLEN]; cannam@89: int len; cannam@89: int err; cannam@89: cannam@89: #ifdef USE_MMAP cannam@89: /* Try first compressing with mmap. If mmap fails (minigzip used in a cannam@89: * pipe), use the normal fread loop. cannam@89: */ cannam@89: if (gz_compress_mmap(in, out) == Z_OK) return; cannam@89: #endif cannam@89: for (;;) { cannam@89: len = (int)fread(buf, 1, sizeof(buf), in); cannam@89: if (ferror(in)) { cannam@89: perror("fread"); cannam@89: exit(1); cannam@89: } cannam@89: if (len == 0) break; cannam@89: cannam@89: if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err)); cannam@89: } cannam@89: fclose(in); cannam@89: if (gzclose(out) != Z_OK) error("failed gzclose"); cannam@89: } cannam@89: cannam@89: #ifdef USE_MMAP /* MMAP version, Miguel Albrecht */ cannam@89: cannam@89: /* Try compressing the input file at once using mmap. Return Z_OK if cannam@89: * if success, Z_ERRNO otherwise. cannam@89: */ cannam@89: int gz_compress_mmap(in, out) cannam@89: FILE *in; cannam@89: gzFile out; cannam@89: { cannam@89: int len; cannam@89: int err; cannam@89: int ifd = fileno(in); cannam@89: caddr_t buf; /* mmap'ed buffer for the entire input file */ cannam@89: off_t buf_len; /* length of the input file */ cannam@89: struct stat sb; cannam@89: cannam@89: /* Determine the size of the file, needed for mmap: */ cannam@89: if (fstat(ifd, &sb) < 0) return Z_ERRNO; cannam@89: buf_len = sb.st_size; cannam@89: if (buf_len <= 0) return Z_ERRNO; cannam@89: cannam@89: /* Now do the actual mmap: */ cannam@89: buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0); cannam@89: if (buf == (caddr_t)(-1)) return Z_ERRNO; cannam@89: cannam@89: /* Compress the whole file at once: */ cannam@89: len = gzwrite(out, (char *)buf, (unsigned)buf_len); cannam@89: cannam@89: if (len != (int)buf_len) error(gzerror(out, &err)); cannam@89: cannam@89: munmap(buf, buf_len); cannam@89: fclose(in); cannam@89: if (gzclose(out) != Z_OK) error("failed gzclose"); cannam@89: return Z_OK; cannam@89: } cannam@89: #endif /* USE_MMAP */ cannam@89: cannam@89: /* =========================================================================== cannam@89: * Uncompress input to output then close both files. cannam@89: */ cannam@89: void gz_uncompress(in, out) cannam@89: gzFile in; cannam@89: FILE *out; cannam@89: { cannam@89: local char buf[BUFLEN]; cannam@89: int len; cannam@89: int err; cannam@89: cannam@89: for (;;) { cannam@89: len = gzread(in, buf, sizeof(buf)); cannam@89: if (len < 0) error (gzerror(in, &err)); cannam@89: if (len == 0) break; cannam@89: cannam@89: if ((int)fwrite(buf, 1, (unsigned)len, out) != len) { cannam@89: error("failed fwrite"); cannam@89: } cannam@89: } cannam@89: if (fclose(out)) error("failed fclose"); cannam@89: cannam@89: if (gzclose(in) != Z_OK) error("failed gzclose"); cannam@89: } cannam@89: cannam@89: cannam@89: /* =========================================================================== cannam@89: * Compress the given file: create a corresponding .gz file and remove the cannam@89: * original. cannam@89: */ cannam@89: void file_compress(file, mode) cannam@89: char *file; cannam@89: char *mode; cannam@89: { cannam@89: local char outfile[MAX_NAME_LEN]; cannam@89: FILE *in; cannam@89: gzFile out; cannam@89: cannam@89: if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) { cannam@89: fprintf(stderr, "%s: filename too long\n", prog); cannam@89: exit(1); cannam@89: } cannam@89: cannam@89: strcpy(outfile, file); cannam@89: strcat(outfile, GZ_SUFFIX); cannam@89: cannam@89: in = fopen(file, "rb"); cannam@89: if (in == NULL) { cannam@89: perror(file); cannam@89: exit(1); cannam@89: } cannam@89: out = gzopen(outfile, mode); cannam@89: if (out == NULL) { cannam@89: fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile); cannam@89: exit(1); cannam@89: } cannam@89: gz_compress(in, out); cannam@89: cannam@89: unlink(file); cannam@89: } cannam@89: cannam@89: cannam@89: /* =========================================================================== cannam@89: * Uncompress the given file and remove the original. cannam@89: */ cannam@89: void file_uncompress(file) cannam@89: char *file; cannam@89: { cannam@89: local char buf[MAX_NAME_LEN]; cannam@89: char *infile, *outfile; cannam@89: FILE *out; cannam@89: gzFile in; cannam@89: size_t len = strlen(file); cannam@89: cannam@89: if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) { cannam@89: fprintf(stderr, "%s: filename too long\n", prog); cannam@89: exit(1); cannam@89: } cannam@89: cannam@89: strcpy(buf, file); cannam@89: cannam@89: if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) { cannam@89: infile = file; cannam@89: outfile = buf; cannam@89: outfile[len-3] = '\0'; cannam@89: } else { cannam@89: outfile = file; cannam@89: infile = buf; cannam@89: strcat(infile, GZ_SUFFIX); cannam@89: } cannam@89: in = gzopen(infile, "rb"); cannam@89: if (in == NULL) { cannam@89: fprintf(stderr, "%s: can't gzopen %s\n", prog, infile); cannam@89: exit(1); cannam@89: } cannam@89: out = fopen(outfile, "wb"); cannam@89: if (out == NULL) { cannam@89: perror(file); cannam@89: exit(1); cannam@89: } cannam@89: cannam@89: gz_uncompress(in, out); cannam@89: cannam@89: unlink(infile); cannam@89: } cannam@89: cannam@89: cannam@89: /* =========================================================================== cannam@89: * Usage: minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...] cannam@89: * -c : write to standard output cannam@89: * -d : decompress cannam@89: * -f : compress with Z_FILTERED cannam@89: * -h : compress with Z_HUFFMAN_ONLY cannam@89: * -r : compress with Z_RLE cannam@89: * -1 to -9 : compression level cannam@89: */ cannam@89: cannam@89: int main(argc, argv) cannam@89: int argc; cannam@89: char *argv[]; cannam@89: { cannam@89: int copyout = 0; cannam@89: int uncompr = 0; cannam@89: gzFile file; cannam@89: char *bname, outmode[20]; cannam@89: cannam@89: strcpy(outmode, "wb6 "); cannam@89: cannam@89: prog = argv[0]; cannam@89: bname = strrchr(argv[0], '/'); cannam@89: if (bname) cannam@89: bname++; cannam@89: else cannam@89: bname = argv[0]; cannam@89: argc--, argv++; cannam@89: cannam@89: if (!strcmp(bname, "gunzip")) cannam@89: uncompr = 1; cannam@89: else if (!strcmp(bname, "zcat")) cannam@89: copyout = uncompr = 1; cannam@89: cannam@89: while (argc > 0) { cannam@89: if (strcmp(*argv, "-c") == 0) cannam@89: copyout = 1; cannam@89: else if (strcmp(*argv, "-d") == 0) cannam@89: uncompr = 1; cannam@89: else if (strcmp(*argv, "-f") == 0) cannam@89: outmode[3] = 'f'; cannam@89: else if (strcmp(*argv, "-h") == 0) cannam@89: outmode[3] = 'h'; cannam@89: else if (strcmp(*argv, "-r") == 0) cannam@89: outmode[3] = 'R'; cannam@89: else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' && cannam@89: (*argv)[2] == 0) cannam@89: outmode[2] = (*argv)[1]; cannam@89: else cannam@89: break; cannam@89: argc--, argv++; cannam@89: } cannam@89: if (outmode[3] == ' ') cannam@89: outmode[3] = 0; cannam@89: if (argc == 0) { cannam@89: SET_BINARY_MODE(stdin); cannam@89: SET_BINARY_MODE(stdout); cannam@89: if (uncompr) { cannam@89: file = gzdopen(fileno(stdin), "rb"); cannam@89: if (file == NULL) error("can't gzdopen stdin"); cannam@89: gz_uncompress(file, stdout); cannam@89: } else { cannam@89: file = gzdopen(fileno(stdout), outmode); cannam@89: if (file == NULL) error("can't gzdopen stdout"); cannam@89: gz_compress(stdin, file); cannam@89: } cannam@89: } else { cannam@89: if (copyout) { cannam@89: SET_BINARY_MODE(stdout); cannam@89: } cannam@89: do { cannam@89: if (uncompr) { cannam@89: if (copyout) { cannam@89: file = gzopen(*argv, "rb"); cannam@89: if (file == NULL) cannam@89: fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv); cannam@89: else cannam@89: gz_uncompress(file, stdout); cannam@89: } else { cannam@89: file_uncompress(*argv); cannam@89: } cannam@89: } else { cannam@89: if (copyout) { cannam@89: FILE * in = fopen(*argv, "rb"); cannam@89: cannam@89: if (in == NULL) { cannam@89: perror(*argv); cannam@89: } else { cannam@89: file = gzdopen(fileno(stdout), outmode); cannam@89: if (file == NULL) error("can't gzdopen stdout"); cannam@89: cannam@89: gz_compress(in, file); cannam@89: } cannam@89: cannam@89: } else { cannam@89: file_compress(*argv, outmode); cannam@89: } cannam@89: } cannam@89: } while (argv++, --argc); cannam@89: } cannam@89: return 0; cannam@89: }