Chris@4: /* minigzip.c -- simulate gzip using the zlib compression library Chris@4: * Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly. Chris@4: * For conditions of distribution and use, see copyright notice in zlib.h Chris@4: */ Chris@4: Chris@4: /* Chris@4: * minigzip is a minimal implementation of the gzip utility. This is Chris@4: * only an example of using zlib and isn't meant to replace the Chris@4: * full-featured gzip. No attempt is made to deal with file systems Chris@4: * limiting names to 14 or 8+3 characters, etc... Error checking is Chris@4: * very limited. So use minigzip only for testing; use gzip for the Chris@4: * real thing. On MSDOS, use only on file names without extension Chris@4: * or in pipe mode. Chris@4: */ Chris@4: Chris@4: /* @(#) $Id$ */ Chris@4: Chris@4: #include "zlib.h" Chris@4: #include Chris@4: Chris@4: #ifdef STDC Chris@4: # include Chris@4: # include Chris@4: #endif Chris@4: Chris@4: #ifdef USE_MMAP Chris@4: # include Chris@4: # include Chris@4: # include Chris@4: #endif Chris@4: Chris@4: #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__) Chris@4: # include Chris@4: # include Chris@4: # ifdef UNDER_CE Chris@4: # include Chris@4: # endif Chris@4: # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) Chris@4: #else Chris@4: # define SET_BINARY_MODE(file) Chris@4: #endif Chris@4: Chris@4: #ifdef VMS Chris@4: # define unlink delete Chris@4: # define GZ_SUFFIX "-gz" Chris@4: #endif Chris@4: #ifdef RISCOS Chris@4: # define unlink remove Chris@4: # define GZ_SUFFIX "-gz" Chris@4: # define fileno(file) file->__file Chris@4: #endif Chris@4: #if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os Chris@4: # include /* for fileno */ Chris@4: #endif Chris@4: Chris@4: #if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE) Chris@4: #ifndef WIN32 /* unlink already in stdio.h for WIN32 */ Chris@4: extern int unlink OF((const char *)); Chris@4: #endif Chris@4: #endif Chris@4: Chris@4: #if defined(UNDER_CE) Chris@4: # include Chris@4: # define perror(s) pwinerror(s) Chris@4: Chris@4: /* Map the Windows error number in ERROR to a locale-dependent error Chris@4: message string and return a pointer to it. Typically, the values Chris@4: for ERROR come from GetLastError. Chris@4: Chris@4: The string pointed to shall not be modified by the application, Chris@4: but may be overwritten by a subsequent call to strwinerror Chris@4: Chris@4: The strwinerror function does not change the current setting Chris@4: of GetLastError. */ Chris@4: Chris@4: static char *strwinerror (error) Chris@4: DWORD error; Chris@4: { Chris@4: static char buf[1024]; Chris@4: Chris@4: wchar_t *msgbuf; Chris@4: DWORD lasterr = GetLastError(); Chris@4: DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM Chris@4: | FORMAT_MESSAGE_ALLOCATE_BUFFER, Chris@4: NULL, Chris@4: error, Chris@4: 0, /* Default language */ Chris@4: (LPVOID)&msgbuf, Chris@4: 0, Chris@4: NULL); Chris@4: if (chars != 0) { Chris@4: /* If there is an \r\n appended, zap it. */ Chris@4: if (chars >= 2 Chris@4: && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') { Chris@4: chars -= 2; Chris@4: msgbuf[chars] = 0; Chris@4: } Chris@4: Chris@4: if (chars > sizeof (buf) - 1) { Chris@4: chars = sizeof (buf) - 1; Chris@4: msgbuf[chars] = 0; Chris@4: } Chris@4: Chris@4: wcstombs(buf, msgbuf, chars + 1); Chris@4: LocalFree(msgbuf); Chris@4: } Chris@4: else { Chris@4: sprintf(buf, "unknown win32 error (%ld)", error); Chris@4: } Chris@4: Chris@4: SetLastError(lasterr); Chris@4: return buf; Chris@4: } Chris@4: Chris@4: static void pwinerror (s) Chris@4: const char *s; Chris@4: { Chris@4: if (s && *s) Chris@4: fprintf(stderr, "%s: %s\n", s, strwinerror(GetLastError ())); Chris@4: else Chris@4: fprintf(stderr, "%s\n", strwinerror(GetLastError ())); Chris@4: } Chris@4: Chris@4: #endif /* UNDER_CE */ Chris@4: Chris@4: #ifndef GZ_SUFFIX Chris@4: # define GZ_SUFFIX ".gz" Chris@4: #endif Chris@4: #define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1) Chris@4: Chris@4: #define BUFLEN 16384 Chris@4: #define MAX_NAME_LEN 1024 Chris@4: Chris@4: #ifdef MAXSEG_64K Chris@4: # define local static Chris@4: /* Needed for systems with limitation on stack size. */ Chris@4: #else Chris@4: # define local Chris@4: #endif Chris@4: Chris@4: #ifdef Z_SOLO Chris@4: /* for Z_SOLO, create simplified gz* functions using deflate and inflate */ Chris@4: Chris@4: #if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE) Chris@4: # include /* for unlink() */ Chris@4: #endif Chris@4: Chris@4: void *myalloc OF((void *, unsigned, unsigned)); Chris@4: void myfree OF((void *, void *)); Chris@4: Chris@4: void *myalloc(q, n, m) Chris@4: void *q; Chris@4: unsigned n, m; Chris@4: { Chris@4: q = Z_NULL; Chris@4: return calloc(n, m); Chris@4: } Chris@4: Chris@4: void myfree(q, p) Chris@4: void *q, *p; Chris@4: { Chris@4: q = Z_NULL; Chris@4: free(p); Chris@4: } Chris@4: Chris@4: typedef struct gzFile_s { Chris@4: FILE *file; Chris@4: int write; Chris@4: int err; Chris@4: char *msg; Chris@4: z_stream strm; Chris@4: } *gzFile; Chris@4: Chris@4: gzFile gzopen OF((const char *, const char *)); Chris@4: gzFile gzdopen OF((int, const char *)); Chris@4: gzFile gz_open OF((const char *, int, const char *)); Chris@4: Chris@4: gzFile gzopen(path, mode) Chris@4: const char *path; Chris@4: const char *mode; Chris@4: { Chris@4: return gz_open(path, -1, mode); Chris@4: } Chris@4: Chris@4: gzFile gzdopen(fd, mode) Chris@4: int fd; Chris@4: const char *mode; Chris@4: { Chris@4: return gz_open(NULL, fd, mode); Chris@4: } Chris@4: Chris@4: gzFile gz_open(path, fd, mode) Chris@4: const char *path; Chris@4: int fd; Chris@4: const char *mode; Chris@4: { Chris@4: gzFile gz; Chris@4: int ret; Chris@4: Chris@4: gz = malloc(sizeof(struct gzFile_s)); Chris@4: if (gz == NULL) Chris@4: return NULL; Chris@4: gz->write = strchr(mode, 'w') != NULL; Chris@4: gz->strm.zalloc = myalloc; Chris@4: gz->strm.zfree = myfree; Chris@4: gz->strm.opaque = Z_NULL; Chris@4: if (gz->write) Chris@4: ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0); Chris@4: else { Chris@4: gz->strm.next_in = 0; Chris@4: gz->strm.avail_in = Z_NULL; Chris@4: ret = inflateInit2(&(gz->strm), 15 + 16); Chris@4: } Chris@4: if (ret != Z_OK) { Chris@4: free(gz); Chris@4: return NULL; Chris@4: } Chris@4: gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") : Chris@4: fopen(path, gz->write ? "wb" : "rb"); Chris@4: if (gz->file == NULL) { Chris@4: gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm)); Chris@4: free(gz); Chris@4: return NULL; Chris@4: } Chris@4: gz->err = 0; Chris@4: gz->msg = ""; Chris@4: return gz; Chris@4: } Chris@4: Chris@4: int gzwrite OF((gzFile, const void *, unsigned)); Chris@4: Chris@4: int gzwrite(gz, buf, len) Chris@4: gzFile gz; Chris@4: const void *buf; Chris@4: unsigned len; Chris@4: { Chris@4: z_stream *strm; Chris@4: unsigned char out[BUFLEN]; Chris@4: Chris@4: if (gz == NULL || !gz->write) Chris@4: return 0; Chris@4: strm = &(gz->strm); Chris@4: strm->next_in = (void *)buf; Chris@4: strm->avail_in = len; Chris@4: do { Chris@4: strm->next_out = out; Chris@4: strm->avail_out = BUFLEN; Chris@4: (void)deflate(strm, Z_NO_FLUSH); Chris@4: fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); Chris@4: } while (strm->avail_out == 0); Chris@4: return len; Chris@4: } Chris@4: Chris@4: int gzread OF((gzFile, void *, unsigned)); Chris@4: Chris@4: int gzread(gz, buf, len) Chris@4: gzFile gz; Chris@4: void *buf; Chris@4: unsigned len; Chris@4: { Chris@4: int ret; Chris@4: unsigned got; Chris@4: unsigned char in[1]; Chris@4: z_stream *strm; Chris@4: Chris@4: if (gz == NULL || gz->write) Chris@4: return 0; Chris@4: if (gz->err) Chris@4: return 0; Chris@4: strm = &(gz->strm); Chris@4: strm->next_out = (void *)buf; Chris@4: strm->avail_out = len; Chris@4: do { Chris@4: got = fread(in, 1, 1, gz->file); Chris@4: if (got == 0) Chris@4: break; Chris@4: strm->next_in = in; Chris@4: strm->avail_in = 1; Chris@4: ret = inflate(strm, Z_NO_FLUSH); Chris@4: if (ret == Z_DATA_ERROR) { Chris@4: gz->err = Z_DATA_ERROR; Chris@4: gz->msg = strm->msg; Chris@4: return 0; Chris@4: } Chris@4: if (ret == Z_STREAM_END) Chris@4: inflateReset(strm); Chris@4: } while (strm->avail_out); Chris@4: return len - strm->avail_out; Chris@4: } Chris@4: Chris@4: int gzclose OF((gzFile)); Chris@4: Chris@4: int gzclose(gz) Chris@4: gzFile gz; Chris@4: { Chris@4: z_stream *strm; Chris@4: unsigned char out[BUFLEN]; Chris@4: Chris@4: if (gz == NULL) Chris@4: return Z_STREAM_ERROR; Chris@4: strm = &(gz->strm); Chris@4: if (gz->write) { Chris@4: strm->next_in = Z_NULL; Chris@4: strm->avail_in = 0; Chris@4: do { Chris@4: strm->next_out = out; Chris@4: strm->avail_out = BUFLEN; Chris@4: (void)deflate(strm, Z_FINISH); Chris@4: fwrite(out, 1, BUFLEN - strm->avail_out, gz->file); Chris@4: } while (strm->avail_out == 0); Chris@4: deflateEnd(strm); Chris@4: } Chris@4: else Chris@4: inflateEnd(strm); Chris@4: fclose(gz->file); Chris@4: free(gz); Chris@4: return Z_OK; Chris@4: } Chris@4: Chris@4: const char *gzerror OF((gzFile, int *)); Chris@4: Chris@4: const char *gzerror(gz, err) Chris@4: gzFile gz; Chris@4: int *err; Chris@4: { Chris@4: *err = gz->err; Chris@4: return gz->msg; Chris@4: } Chris@4: Chris@4: #endif Chris@4: Chris@4: char *prog; Chris@4: Chris@4: void error OF((const char *msg)); Chris@4: void gz_compress OF((FILE *in, gzFile out)); Chris@4: #ifdef USE_MMAP Chris@4: int gz_compress_mmap OF((FILE *in, gzFile out)); Chris@4: #endif Chris@4: void gz_uncompress OF((gzFile in, FILE *out)); Chris@4: void file_compress OF((char *file, char *mode)); Chris@4: void file_uncompress OF((char *file)); Chris@4: int main OF((int argc, char *argv[])); Chris@4: Chris@4: /* =========================================================================== Chris@4: * Display error message and exit Chris@4: */ Chris@4: void error(msg) Chris@4: const char *msg; Chris@4: { Chris@4: fprintf(stderr, "%s: %s\n", prog, msg); Chris@4: exit(1); Chris@4: } Chris@4: Chris@4: /* =========================================================================== Chris@4: * Compress input to output then close both files. Chris@4: */ Chris@4: Chris@4: void gz_compress(in, out) Chris@4: FILE *in; Chris@4: gzFile out; Chris@4: { Chris@4: local char buf[BUFLEN]; Chris@4: int len; Chris@4: int err; Chris@4: Chris@4: #ifdef USE_MMAP Chris@4: /* Try first compressing with mmap. If mmap fails (minigzip used in a Chris@4: * pipe), use the normal fread loop. Chris@4: */ Chris@4: if (gz_compress_mmap(in, out) == Z_OK) return; Chris@4: #endif Chris@4: for (;;) { Chris@4: len = (int)fread(buf, 1, sizeof(buf), in); Chris@4: if (ferror(in)) { Chris@4: perror("fread"); Chris@4: exit(1); Chris@4: } Chris@4: if (len == 0) break; Chris@4: Chris@4: if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err)); Chris@4: } Chris@4: fclose(in); Chris@4: if (gzclose(out) != Z_OK) error("failed gzclose"); Chris@4: } Chris@4: Chris@4: #ifdef USE_MMAP /* MMAP version, Miguel Albrecht */ Chris@4: Chris@4: /* Try compressing the input file at once using mmap. Return Z_OK if Chris@4: * if success, Z_ERRNO otherwise. Chris@4: */ Chris@4: int gz_compress_mmap(in, out) Chris@4: FILE *in; Chris@4: gzFile out; Chris@4: { Chris@4: int len; Chris@4: int err; Chris@4: int ifd = fileno(in); Chris@4: caddr_t buf; /* mmap'ed buffer for the entire input file */ Chris@4: off_t buf_len; /* length of the input file */ Chris@4: struct stat sb; Chris@4: Chris@4: /* Determine the size of the file, needed for mmap: */ Chris@4: if (fstat(ifd, &sb) < 0) return Z_ERRNO; Chris@4: buf_len = sb.st_size; Chris@4: if (buf_len <= 0) return Z_ERRNO; Chris@4: Chris@4: /* Now do the actual mmap: */ Chris@4: buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0); Chris@4: if (buf == (caddr_t)(-1)) return Z_ERRNO; Chris@4: Chris@4: /* Compress the whole file at once: */ Chris@4: len = gzwrite(out, (char *)buf, (unsigned)buf_len); Chris@4: Chris@4: if (len != (int)buf_len) error(gzerror(out, &err)); Chris@4: Chris@4: munmap(buf, buf_len); Chris@4: fclose(in); Chris@4: if (gzclose(out) != Z_OK) error("failed gzclose"); Chris@4: return Z_OK; Chris@4: } Chris@4: #endif /* USE_MMAP */ Chris@4: Chris@4: /* =========================================================================== Chris@4: * Uncompress input to output then close both files. Chris@4: */ Chris@4: void gz_uncompress(in, out) Chris@4: gzFile in; Chris@4: FILE *out; Chris@4: { Chris@4: local char buf[BUFLEN]; Chris@4: int len; Chris@4: int err; Chris@4: Chris@4: for (;;) { Chris@4: len = gzread(in, buf, sizeof(buf)); Chris@4: if (len < 0) error (gzerror(in, &err)); Chris@4: if (len == 0) break; Chris@4: Chris@4: if ((int)fwrite(buf, 1, (unsigned)len, out) != len) { Chris@4: error("failed fwrite"); Chris@4: } Chris@4: } Chris@4: if (fclose(out)) error("failed fclose"); Chris@4: Chris@4: if (gzclose(in) != Z_OK) error("failed gzclose"); Chris@4: } Chris@4: Chris@4: Chris@4: /* =========================================================================== Chris@4: * Compress the given file: create a corresponding .gz file and remove the Chris@4: * original. Chris@4: */ Chris@4: void file_compress(file, mode) Chris@4: char *file; Chris@4: char *mode; Chris@4: { Chris@4: local char outfile[MAX_NAME_LEN]; Chris@4: FILE *in; Chris@4: gzFile out; Chris@4: Chris@4: if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) { Chris@4: fprintf(stderr, "%s: filename too long\n", prog); Chris@4: exit(1); Chris@4: } Chris@4: Chris@4: strcpy(outfile, file); Chris@4: strcat(outfile, GZ_SUFFIX); Chris@4: Chris@4: in = fopen(file, "rb"); Chris@4: if (in == NULL) { Chris@4: perror(file); Chris@4: exit(1); Chris@4: } Chris@4: out = gzopen(outfile, mode); Chris@4: if (out == NULL) { Chris@4: fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile); Chris@4: exit(1); Chris@4: } Chris@4: gz_compress(in, out); Chris@4: Chris@4: unlink(file); Chris@4: } Chris@4: Chris@4: Chris@4: /* =========================================================================== Chris@4: * Uncompress the given file and remove the original. Chris@4: */ Chris@4: void file_uncompress(file) Chris@4: char *file; Chris@4: { Chris@4: local char buf[MAX_NAME_LEN]; Chris@4: char *infile, *outfile; Chris@4: FILE *out; Chris@4: gzFile in; Chris@4: size_t len = strlen(file); Chris@4: Chris@4: if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) { Chris@4: fprintf(stderr, "%s: filename too long\n", prog); Chris@4: exit(1); Chris@4: } Chris@4: Chris@4: strcpy(buf, file); Chris@4: Chris@4: if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) { Chris@4: infile = file; Chris@4: outfile = buf; Chris@4: outfile[len-3] = '\0'; Chris@4: } else { Chris@4: outfile = file; Chris@4: infile = buf; Chris@4: strcat(infile, GZ_SUFFIX); Chris@4: } Chris@4: in = gzopen(infile, "rb"); Chris@4: if (in == NULL) { Chris@4: fprintf(stderr, "%s: can't gzopen %s\n", prog, infile); Chris@4: exit(1); Chris@4: } Chris@4: out = fopen(outfile, "wb"); Chris@4: if (out == NULL) { Chris@4: perror(file); Chris@4: exit(1); Chris@4: } Chris@4: Chris@4: gz_uncompress(in, out); Chris@4: Chris@4: unlink(infile); Chris@4: } Chris@4: Chris@4: Chris@4: /* =========================================================================== Chris@4: * Usage: minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...] Chris@4: * -c : write to standard output Chris@4: * -d : decompress Chris@4: * -f : compress with Z_FILTERED Chris@4: * -h : compress with Z_HUFFMAN_ONLY Chris@4: * -r : compress with Z_RLE Chris@4: * -1 to -9 : compression level Chris@4: */ Chris@4: Chris@4: int main(argc, argv) Chris@4: int argc; Chris@4: char *argv[]; Chris@4: { Chris@4: int copyout = 0; Chris@4: int uncompr = 0; Chris@4: gzFile file; Chris@4: char *bname, outmode[20]; Chris@4: Chris@4: strcpy(outmode, "wb6 "); Chris@4: Chris@4: prog = argv[0]; Chris@4: bname = strrchr(argv[0], '/'); Chris@4: if (bname) Chris@4: bname++; Chris@4: else Chris@4: bname = argv[0]; Chris@4: argc--, argv++; Chris@4: Chris@4: if (!strcmp(bname, "gunzip")) Chris@4: uncompr = 1; Chris@4: else if (!strcmp(bname, "zcat")) Chris@4: copyout = uncompr = 1; Chris@4: Chris@4: while (argc > 0) { Chris@4: if (strcmp(*argv, "-c") == 0) Chris@4: copyout = 1; Chris@4: else if (strcmp(*argv, "-d") == 0) Chris@4: uncompr = 1; Chris@4: else if (strcmp(*argv, "-f") == 0) Chris@4: outmode[3] = 'f'; Chris@4: else if (strcmp(*argv, "-h") == 0) Chris@4: outmode[3] = 'h'; Chris@4: else if (strcmp(*argv, "-r") == 0) Chris@4: outmode[3] = 'R'; Chris@4: else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' && Chris@4: (*argv)[2] == 0) Chris@4: outmode[2] = (*argv)[1]; Chris@4: else Chris@4: break; Chris@4: argc--, argv++; Chris@4: } Chris@4: if (outmode[3] == ' ') Chris@4: outmode[3] = 0; Chris@4: if (argc == 0) { Chris@4: SET_BINARY_MODE(stdin); Chris@4: SET_BINARY_MODE(stdout); Chris@4: if (uncompr) { Chris@4: file = gzdopen(fileno(stdin), "rb"); Chris@4: if (file == NULL) error("can't gzdopen stdin"); Chris@4: gz_uncompress(file, stdout); Chris@4: } else { Chris@4: file = gzdopen(fileno(stdout), outmode); Chris@4: if (file == NULL) error("can't gzdopen stdout"); Chris@4: gz_compress(stdin, file); Chris@4: } Chris@4: } else { Chris@4: if (copyout) { Chris@4: SET_BINARY_MODE(stdout); Chris@4: } Chris@4: do { Chris@4: if (uncompr) { Chris@4: if (copyout) { Chris@4: file = gzopen(*argv, "rb"); Chris@4: if (file == NULL) Chris@4: fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv); Chris@4: else Chris@4: gz_uncompress(file, stdout); Chris@4: } else { Chris@4: file_uncompress(*argv); Chris@4: } Chris@4: } else { Chris@4: if (copyout) { Chris@4: FILE * in = fopen(*argv, "rb"); Chris@4: Chris@4: if (in == NULL) { Chris@4: perror(*argv); Chris@4: } else { Chris@4: file = gzdopen(fileno(stdout), outmode); Chris@4: if (file == NULL) error("can't gzdopen stdout"); Chris@4: Chris@4: gz_compress(in, file); Chris@4: } Chris@4: Chris@4: } else { Chris@4: file_compress(*argv, outmode); Chris@4: } Chris@4: } Chris@4: } while (argv++, --argc); Chris@4: } Chris@4: return 0; Chris@4: }