cannam@128: /* minigzip.c -- simulate gzip using the zlib compression library cannam@128: * Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly. cannam@128: * For conditions of distribution and use, see copyright notice in zlib.h cannam@128: */ cannam@128: cannam@128: /* cannam@128: * minigzip is a minimal implementation of the gzip utility. This is cannam@128: * only an example of using zlib and isn't meant to replace the cannam@128: * full-featured gzip. No attempt is made to deal with file systems cannam@128: * limiting names to 14 or 8+3 characters, etc... Error checking is cannam@128: * very limited. So use minigzip only for testing; use gzip for the cannam@128: * real thing. On MSDOS, use only on file names without extension cannam@128: * or in pipe mode. cannam@128: */ cannam@128: cannam@128: /* @(#) $Id$ */ cannam@128: cannam@128: #include "zlib.h" cannam@128: #include cannam@128: cannam@128: #ifdef STDC cannam@128: # include cannam@128: # include cannam@128: #endif cannam@128: cannam@128: #ifdef USE_MMAP cannam@128: # include cannam@128: # include cannam@128: # include cannam@128: #endif cannam@128: cannam@128: #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__) cannam@128: # include cannam@128: # include cannam@128: # ifdef UNDER_CE cannam@128: # include cannam@128: # endif cannam@128: # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) cannam@128: #else cannam@128: # define SET_BINARY_MODE(file) cannam@128: #endif cannam@128: cannam@128: #ifdef _MSC_VER cannam@128: # define snprintf _snprintf cannam@128: #endif cannam@128: cannam@128: #ifdef VMS cannam@128: # define unlink delete cannam@128: # define GZ_SUFFIX "-gz" cannam@128: #endif cannam@128: #ifdef RISCOS cannam@128: # define unlink remove cannam@128: # define GZ_SUFFIX "-gz" cannam@128: # define fileno(file) file->__file cannam@128: #endif cannam@128: #if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os cannam@128: # include /* for fileno */ cannam@128: #endif cannam@128: cannam@128: #if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE) cannam@128: #ifndef WIN32 /* unlink already in stdio.h for WIN32 */ cannam@128: extern int unlink OF((const char *)); cannam@128: #endif cannam@128: #endif cannam@128: cannam@128: #if defined(UNDER_CE) cannam@128: # include cannam@128: # define perror(s) pwinerror(s) cannam@128: cannam@128: /* Map the Windows error number in ERROR to a locale-dependent error cannam@128: message string and return a pointer to it. Typically, the values cannam@128: for ERROR come from GetLastError. cannam@128: cannam@128: The string pointed to shall not be modified by the application, cannam@128: but may be overwritten by a subsequent call to strwinerror cannam@128: cannam@128: The strwinerror function does not change the current setting cannam@128: of GetLastError. */ cannam@128: cannam@128: static char *strwinerror (error) cannam@128: DWORD error; cannam@128: { cannam@128: static char buf[1024]; cannam@128: cannam@128: wchar_t *msgbuf; cannam@128: DWORD lasterr = GetLastError(); cannam@128: DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM cannam@128: | FORMAT_MESSAGE_ALLOCATE_BUFFER, cannam@128: NULL, cannam@128: error, cannam@128: 0, /* Default language */ cannam@128: (LPVOID)&msgbuf, cannam@128: 0, cannam@128: NULL); cannam@128: if (chars != 0) { cannam@128: /* If there is an \r\n appended, zap it. */ cannam@128: if (chars >= 2 cannam@128: && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { cannam@128: chars -= 2; cannam@128: msgbuf[chars] = 0; cannam@128: } cannam@128: cannam@128: if (chars > sizeof (buf) - 1) { cannam@128: chars = sizeof (buf) - 1; cannam@128: msgbuf[chars] = 0; cannam@128: } cannam@128: cannam@128: wcstombs(buf, msgbuf, chars + 1); cannam@128: LocalFree(msgbuf); cannam@128: } cannam@128: else { cannam@128: sprintf(buf, "unknown win32 error (%ld)", error); cannam@128: } cannam@128: cannam@128: SetLastError(lasterr); cannam@128: return buf; cannam@128: } cannam@128: cannam@128: static void pwinerror (s) cannam@128: const char *s; cannam@128: { cannam@128: if (s && *s) cannam@128: fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ())); cannam@128: else cannam@128: fprintf(stderr, "%s\n", strwinerror(GetLastError ())); cannam@128: } cannam@128: cannam@128: #endif /* UNDER_CE */ cannam@128: cannam@128: #ifndef GZ_SUFFIX cannam@128: # define GZ_SUFFIX ".gz" cannam@128: #endif cannam@128: #define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1) cannam@128: cannam@128: #define BUFLEN 16384 cannam@128: #define MAX_NAME_LEN 1024 cannam@128: cannam@128: #ifdef MAXSEG_64K cannam@128: # define local static cannam@128: /* Needed for systems with limitation on stack size. */ cannam@128: #else cannam@128: # define local cannam@128: #endif cannam@128: cannam@128: #ifdef Z_SOLO cannam@128: /* for Z_SOLO, create simplified gz* functions using deflate and inflate */ cannam@128: cannam@128: #if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE) cannam@128: # include /* for unlink() */ cannam@128: #endif cannam@128: cannam@128: void *myalloc OF((void *, unsigned, unsigned)); cannam@128: void myfree OF((void *, void *)); cannam@128: cannam@128: void *myalloc(q, n, m) cannam@128: void *q; cannam@128: unsigned n, m; cannam@128: { cannam@128: q = Z_NULL; cannam@128: return calloc(n, m); cannam@128: } cannam@128: cannam@128: void myfree(q, p) cannam@128: void *q, *p; cannam@128: { cannam@128: q = Z_NULL; cannam@128: free(p); cannam@128: } cannam@128: cannam@128: typedef struct gzFile_s { cannam@128: FILE *file; cannam@128: int write; cannam@128: int err; cannam@128: char *msg; cannam@128: z_stream strm; cannam@128: } *gzFile; cannam@128: cannam@128: gzFile gzopen OF((const char *, const char *)); cannam@128: gzFile gzdopen OF((int, const char *)); cannam@128: gzFile gz_open OF((const char *, int, const char *)); cannam@128: cannam@128: gzFile gzopen(path, mode) cannam@128: const char *path; cannam@128: const char *mode; cannam@128: { cannam@128: return gz_open(path, -1, mode); cannam@128: } cannam@128: cannam@128: gzFile gzdopen(fd, mode) cannam@128: int fd; cannam@128: const char *mode; cannam@128: { cannam@128: return gz_open(NULL, fd, mode); cannam@128: } cannam@128: cannam@128: gzFile gz_open(path, fd, mode) cannam@128: const char *path; cannam@128: int fd; cannam@128: const char *mode; cannam@128: { cannam@128: gzFile gz; cannam@128: int ret; cannam@128: cannam@128: gz = malloc(sizeof(struct gzFile_s)); cannam@128: if (gz == NULL) cannam@128: return NULL; cannam@128: gz->write = strchr(mode, 'w') != NULL; cannam@128: gz->strm.zalloc = myalloc; cannam@128: gz->strm.zfree = myfree; cannam@128: gz->strm.opaque = Z_NULL; cannam@128: if (gz->write) cannam@128: ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0); cannam@128: else { cannam@128: gz->strm.next_in = 0; cannam@128: gz->strm.avail_in = Z_NULL; cannam@128: ret = inflateInit2(&(gz->strm), 15 + 16); cannam@128: } cannam@128: if (ret != Z_OK) { cannam@128: free(gz); cannam@128: return NULL; cannam@128: } cannam@128: gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") : cannam@128: fopen(path, gz->write ? "wb" : "rb"); cannam@128: if (gz->file == NULL) { cannam@128: gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm)); cannam@128: free(gz); cannam@128: return NULL; cannam@128: } cannam@128: gz->err = 0; cannam@128: gz->msg = ""; cannam@128: return gz; cannam@128: } cannam@128: cannam@128: int gzwrite OF((gzFile, const void *, unsigned)); cannam@128: cannam@128: int gzwrite(gz, buf, len) cannam@128: gzFile gz; cannam@128: const void *buf; cannam@128: unsigned len; cannam@128: { cannam@128: z_stream *strm; cannam@128: unsigned char out[BUFLEN]; cannam@128: cannam@128: if (gz == NULL || !gz->write) cannam@128: return 0; cannam@128: strm = &(gz->strm); cannam@128: strm->next_in = (void *)buf; cannam@128: strm->avail_in = len; cannam@128: do { cannam@128: strm->next_out = out; cannam@128: strm->avail_out = BUFLEN; cannam@128: (void)deflate(strm, Z_NO_FLUSH); cannam@128: fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); cannam@128: } while (strm->avail_out == 0); cannam@128: return len; cannam@128: } cannam@128: cannam@128: int gzread OF((gzFile, void *, unsigned)); cannam@128: cannam@128: int gzread(gz, buf, len) cannam@128: gzFile gz; cannam@128: void *buf; cannam@128: unsigned len; cannam@128: { cannam@128: int ret; cannam@128: unsigned got; cannam@128: unsigned char in[1]; cannam@128: z_stream *strm; cannam@128: cannam@128: if (gz == NULL || gz->write) cannam@128: return 0; cannam@128: if (gz->err) cannam@128: return 0; cannam@128: strm = &(gz->strm); cannam@128: strm->next_out = (void *)buf; cannam@128: strm->avail_out = len; cannam@128: do { cannam@128: got = fread(in, 1, 1, gz->file); cannam@128: if (got == 0) cannam@128: break; cannam@128: strm->next_in = in; cannam@128: strm->avail_in = 1; cannam@128: ret = inflate(strm, Z_NO_FLUSH); cannam@128: if (ret == Z_DATA_ERROR) { cannam@128: gz->err = Z_DATA_ERROR; cannam@128: gz->msg = strm->msg; cannam@128: return 0; cannam@128: } cannam@128: if (ret == Z_STREAM_END) cannam@128: inflateReset(strm); cannam@128: } while (strm->avail_out); cannam@128: return len - strm->avail_out; cannam@128: } cannam@128: cannam@128: int gzclose OF((gzFile)); cannam@128: cannam@128: int gzclose(gz) cannam@128: gzFile gz; cannam@128: { cannam@128: z_stream *strm; cannam@128: unsigned char out[BUFLEN]; cannam@128: cannam@128: if (gz == NULL) cannam@128: return Z_STREAM_ERROR; cannam@128: strm = &(gz->strm); cannam@128: if (gz->write) { cannam@128: strm->next_in = Z_NULL; cannam@128: strm->avail_in = 0; cannam@128: do { cannam@128: strm->next_out = out; cannam@128: strm->avail_out = BUFLEN; cannam@128: (void)deflate(strm, Z_FINISH); cannam@128: fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); cannam@128: } while (strm->avail_out == 0); cannam@128: deflateEnd(strm); cannam@128: } cannam@128: else cannam@128: inflateEnd(strm); cannam@128: fclose(gz->file); cannam@128: free(gz); cannam@128: return Z_OK; cannam@128: } cannam@128: cannam@128: const char *gzerror OF((gzFile, int *)); cannam@128: cannam@128: const char *gzerror(gz, err) cannam@128: gzFile gz; cannam@128: int *err; cannam@128: { cannam@128: *err = gz->err; cannam@128: return gz->msg; cannam@128: } cannam@128: cannam@128: #endif cannam@128: cannam@128: char *prog; cannam@128: cannam@128: void error OF((const char *msg)); cannam@128: void gz_compress OF((FILE *in, gzFile out)); cannam@128: #ifdef USE_MMAP cannam@128: int gz_compress_mmap OF((FILE *in, gzFile out)); cannam@128: #endif cannam@128: void gz_uncompress OF((gzFile in, FILE *out)); cannam@128: void file_compress OF((char *file, char *mode)); cannam@128: void file_uncompress OF((char *file)); cannam@128: int main OF((int argc, char *argv[])); cannam@128: cannam@128: /* =========================================================================== cannam@128: * Display error message and exit cannam@128: */ cannam@128: void error(msg) cannam@128: const char *msg; cannam@128: { cannam@128: fprintf(stderr, "%s: %s\n", prog, msg); cannam@128: exit(1); cannam@128: } cannam@128: cannam@128: /* =========================================================================== cannam@128: * Compress input to output then close both files. cannam@128: */ cannam@128: cannam@128: void gz_compress(in, out) cannam@128: FILE *in; cannam@128: gzFile out; cannam@128: { cannam@128: local char buf[BUFLEN]; cannam@128: int len; cannam@128: int err; cannam@128: cannam@128: #ifdef USE_MMAP cannam@128: /* Try first compressing with mmap. If mmap fails (minigzip used in a cannam@128: * pipe), use the normal fread loop. cannam@128: */ cannam@128: if (gz_compress_mmap(in, out) == Z_OK) return; cannam@128: #endif cannam@128: for (;;) { cannam@128: len = (int)fread(buf, 1, sizeof(buf), in); cannam@128: if (ferror(in)) { cannam@128: perror("fread"); cannam@128: exit(1); cannam@128: } cannam@128: if (len == 0) break; cannam@128: cannam@128: if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err)); cannam@128: } cannam@128: fclose(in); cannam@128: if (gzclose(out) != Z_OK) error("failed gzclose"); cannam@128: } cannam@128: cannam@128: #ifdef USE_MMAP /* MMAP version, Miguel Albrecht */ cannam@128: cannam@128: /* Try compressing the input file at once using mmap. Return Z_OK if cannam@128: * if success, Z_ERRNO otherwise. cannam@128: */ cannam@128: int gz_compress_mmap(in, out) cannam@128: FILE *in; cannam@128: gzFile out; cannam@128: { cannam@128: int len; cannam@128: int err; cannam@128: int ifd = fileno(in); cannam@128: caddr_t buf; /* mmap'ed buffer for the entire input file */ cannam@128: off_t buf_len; /* length of the input file */ cannam@128: struct stat sb; cannam@128: cannam@128: /* Determine the size of the file, needed for mmap: */ cannam@128: if (fstat(ifd, &sb) < 0) return Z_ERRNO; cannam@128: buf_len = sb.st_size; cannam@128: if (buf_len <= 0) return Z_ERRNO; cannam@128: cannam@128: /* Now do the actual mmap: */ cannam@128: buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0); cannam@128: if (buf == (caddr_t)(-1)) return Z_ERRNO; cannam@128: cannam@128: /* Compress the whole file at once: */ cannam@128: len = gzwrite(out, (char *)buf, (unsigned)buf_len); cannam@128: cannam@128: if (len != (int)buf_len) error(gzerror(out, &err)); cannam@128: cannam@128: munmap(buf, buf_len); cannam@128: fclose(in); cannam@128: if (gzclose(out) != Z_OK) error("failed gzclose"); cannam@128: return Z_OK; cannam@128: } cannam@128: #endif /* USE_MMAP */ cannam@128: cannam@128: /* =========================================================================== cannam@128: * Uncompress input to output then close both files. cannam@128: */ cannam@128: void gz_uncompress(in, out) cannam@128: gzFile in; cannam@128: FILE *out; cannam@128: { cannam@128: local char buf[BUFLEN]; cannam@128: int len; cannam@128: int err; cannam@128: cannam@128: for (;;) { cannam@128: len = gzread(in, buf, sizeof(buf)); cannam@128: if (len < 0) error (gzerror(in, &err)); cannam@128: if (len == 0) break; cannam@128: cannam@128: if ((int)fwrite(buf, 1, (unsigned)len, out) != len) { cannam@128: error("failed fwrite"); cannam@128: } cannam@128: } cannam@128: if (fclose(out)) error("failed fclose"); cannam@128: cannam@128: if (gzclose(in) != Z_OK) error("failed gzclose"); cannam@128: } cannam@128: cannam@128: cannam@128: /* =========================================================================== cannam@128: * Compress the given file: create a corresponding .gz file and remove the cannam@128: * original. cannam@128: */ cannam@128: void file_compress(file, mode) cannam@128: char *file; cannam@128: char *mode; cannam@128: { cannam@128: local char outfile[MAX_NAME_LEN]; cannam@128: FILE *in; cannam@128: gzFile out; cannam@128: cannam@128: if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) { cannam@128: fprintf(stderr, "%s: filename too long\n", prog); cannam@128: exit(1); cannam@128: } cannam@128: cannam@128: #if !defined(NO_snprintf) && !defined(NO_vsnprintf) cannam@128: snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX); cannam@128: #else cannam@128: strcpy(outfile, file); cannam@128: strcat(outfile, GZ_SUFFIX); cannam@128: #endif cannam@128: cannam@128: in = fopen(file, "rb"); cannam@128: if (in == NULL) { cannam@128: perror(file); cannam@128: exit(1); cannam@128: } cannam@128: out = gzopen(outfile, mode); cannam@128: if (out == NULL) { cannam@128: fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile); cannam@128: exit(1); cannam@128: } cannam@128: gz_compress(in, out); cannam@128: cannam@128: unlink(file); cannam@128: } cannam@128: cannam@128: cannam@128: /* =========================================================================== cannam@128: * Uncompress the given file and remove the original. cannam@128: */ cannam@128: void file_uncompress(file) cannam@128: char *file; cannam@128: { cannam@128: local char buf[MAX_NAME_LEN]; cannam@128: char *infile, *outfile; cannam@128: FILE *out; cannam@128: gzFile in; cannam@128: size_t len = strlen(file); cannam@128: cannam@128: if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) { cannam@128: fprintf(stderr, "%s: filename too long\n", prog); cannam@128: exit(1); cannam@128: } cannam@128: cannam@128: #if !defined(NO_snprintf) && !defined(NO_vsnprintf) cannam@128: snprintf(buf, sizeof(buf), "%s", file); cannam@128: #else cannam@128: strcpy(buf, file); cannam@128: #endif cannam@128: cannam@128: if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) { cannam@128: infile = file; cannam@128: outfile = buf; cannam@128: outfile[len-3] = '\0'; cannam@128: } else { cannam@128: outfile = file; cannam@128: infile = buf; cannam@128: #if !defined(NO_snprintf) && !defined(NO_vsnprintf) cannam@128: snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX); cannam@128: #else cannam@128: strcat(infile, GZ_SUFFIX); cannam@128: #endif cannam@128: } cannam@128: in = gzopen(infile, "rb"); cannam@128: if (in == NULL) { cannam@128: fprintf(stderr, "%s: can't gzopen %s\n", prog, infile); cannam@128: exit(1); cannam@128: } cannam@128: out = fopen(outfile, "wb"); cannam@128: if (out == NULL) { cannam@128: perror(file); cannam@128: exit(1); cannam@128: } cannam@128: cannam@128: gz_uncompress(in, out); cannam@128: cannam@128: unlink(infile); cannam@128: } cannam@128: cannam@128: cannam@128: /* =========================================================================== cannam@128: * Usage: minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...] cannam@128: * -c : write to standard output cannam@128: * -d : decompress cannam@128: * -f : compress with Z_FILTERED cannam@128: * -h : compress with Z_HUFFMAN_ONLY cannam@128: * -r : compress with Z_RLE cannam@128: * -1 to -9 : compression level cannam@128: */ cannam@128: cannam@128: int main(argc, argv) cannam@128: int argc; cannam@128: char *argv[]; cannam@128: { cannam@128: int copyout = 0; cannam@128: int uncompr = 0; cannam@128: gzFile file; cannam@128: char *bname, outmode[20]; cannam@128: cannam@128: #if !defined(NO_snprintf) && !defined(NO_vsnprintf) cannam@128: snprintf(outmode, sizeof(outmode), "%s", "wb6 "); cannam@128: #else cannam@128: strcpy(outmode, "wb6 "); cannam@128: #endif cannam@128: cannam@128: prog = argv[0]; cannam@128: bname = strrchr(argv[0], '/'); cannam@128: if (bname) cannam@128: bname++; cannam@128: else cannam@128: bname = argv[0]; cannam@128: argc--, argv++; cannam@128: cannam@128: if (!strcmp(bname, "gunzip")) cannam@128: uncompr = 1; cannam@128: else if (!strcmp(bname, "zcat")) cannam@128: copyout = uncompr = 1; cannam@128: cannam@128: while (argc > 0) { cannam@128: if (strcmp(*argv, "-c") == 0) cannam@128: copyout = 1; cannam@128: else if (strcmp(*argv, "-d") == 0) cannam@128: uncompr = 1; cannam@128: else if (strcmp(*argv, "-f") == 0) cannam@128: outmode[3] = 'f'; cannam@128: else if (strcmp(*argv, "-h") == 0) cannam@128: outmode[3] = 'h'; cannam@128: else if (strcmp(*argv, "-r") == 0) cannam@128: outmode[3] = 'R'; cannam@128: else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' && cannam@128: (*argv)[2] == 0) cannam@128: outmode[2] = (*argv)[1]; cannam@128: else cannam@128: break; cannam@128: argc--, argv++; cannam@128: } cannam@128: if (outmode[3] == ' ') cannam@128: outmode[3] = 0; cannam@128: if (argc == 0) { cannam@128: SET_BINARY_MODE(stdin); cannam@128: SET_BINARY_MODE(stdout); cannam@128: if (uncompr) { cannam@128: file = gzdopen(fileno(stdin), "rb"); cannam@128: if (file == NULL) error("can't gzdopen stdin"); cannam@128: gz_uncompress(file, stdout); cannam@128: } else { cannam@128: file = gzdopen(fileno(stdout), outmode); cannam@128: if (file == NULL) error("can't gzdopen stdout"); cannam@128: gz_compress(stdin, file); cannam@128: } cannam@128: } else { cannam@128: if (copyout) { cannam@128: SET_BINARY_MODE(stdout); cannam@128: } cannam@128: do { cannam@128: if (uncompr) { cannam@128: if (copyout) { cannam@128: file = gzopen(*argv, "rb"); cannam@128: if (file == NULL) cannam@128: fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv); cannam@128: else cannam@128: gz_uncompress(file, stdout); cannam@128: } else { cannam@128: file_uncompress(*argv); cannam@128: } cannam@128: } else { cannam@128: if (copyout) { cannam@128: FILE * in = fopen(*argv, "rb"); cannam@128: cannam@128: if (in == NULL) { cannam@128: perror(*argv); cannam@128: } else { cannam@128: file = gzdopen(fileno(stdout), outmode); cannam@128: if (file == NULL) error("can't gzdopen stdout"); cannam@128: cannam@128: gz_compress(in, file); cannam@128: } cannam@128: cannam@128: } else { cannam@128: file_compress(*argv, outmode); cannam@128: } cannam@128: } cannam@128: } while (argv++, --argc); cannam@128: } cannam@128: return 0; cannam@128: }