FreeBSD/Linux Kernel Cross Reference
sys/contrib/zstd/zlibWrapper/examples/minigzip.c

     /* minigzip.c contains minimal changes required to be compiled with zlibWrapper:
      * - #include "zlib.h" was changed to #include "zstd_zlibwrapper.h"        */
     
     /* minigzip.c -- simulate gzip using the zlib compression library
      * Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly.
      * For conditions of distribution and use, see http://www.zlib.net/zlib_license.html
      */
     
     /*
     * 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.
     */
    
    /* @(#) $Id$ */
    
    #define _POSIX_SOURCE /* fileno */
    
    #include "zstd_zlibwrapper.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 _MSC_VER
    #  define snprintf _snprintf
    #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
   
   #ifdef Z_SOLO
   /* for Z_SOLO, create simplified gz* functions using deflate and inflate */
   
   #if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE)
   #  include <unistd.h>       /* for unlink() */
   #endif
   
   void *myalloc OF((void *, unsigned, unsigned));
   void myfree OF((void *, void *));
   
   void *myalloc(q, n, m)
       void *q;
       unsigned n, m;
   {
       q = Z_NULL;
       return calloc(n, m);
   }
   
   void myfree(q, p)
       void *q, *p;
   {
       q = Z_NULL;
       free(p);
   }
   
   typedef struct gzFile_s {
       FILE *file;
       int write;
       int err;
       char *msg;
       z_stream strm;
   } *gzFile;
   
   gzFile gzopen OF((const char *, const char *));
   gzFile gzdopen OF((int, const char *));
   gzFile gz_open OF((const char *, int, const char *));
   
   gzFile gzopen(path, mode)
   const char *path;
   const char *mode;
   {
       return gz_open(path, -1, mode);
   }
   
   gzFile gzdopen(fd, mode)
   int fd;
   const char *mode;
   {
       return gz_open(NULL, fd, mode);
   }
   
   gzFile gz_open(path, fd, mode)
       const char *path;
       int fd;
       const char *mode;
   {
       gzFile gz;
       int ret;
   
       gz = malloc(sizeof(struct gzFile_s));
       if (gz == NULL)
           return NULL;
       gz->write = strchr(mode, 'w') != NULL;
       gz->strm.zalloc = myalloc;
       gz->strm.zfree = myfree;
       gz->strm.opaque = Z_NULL;
       if (gz->write)
           ret = deflateInit2(&(gz->strm), -1, 8, 15 + 16, 8, 0);
       else {
           gz->strm.next_in = 0;
           gz->strm.avail_in = Z_NULL;
           ret = inflateInit2(&(gz->strm), 15 + 16);
       }
       if (ret != Z_OK) {
           free(gz);
           return NULL;
       }
       gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") :
                                 fopen(path, gz->write ? "wb" : "rb");
       if (gz->file == NULL) {
           gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm));
           free(gz);
           return NULL;
       }
       gz->err = 0;
       gz->msg = "";
       return gz;
   }
   
   int gzwrite OF((gzFile, const void *, unsigned));
   
   int gzwrite(gz, buf, len)
       gzFile gz;
       const void *buf;
       unsigned len;
   {
       z_stream *strm;
       unsigned char out[BUFLEN];
   
       if (gz == NULL || !gz->write)
           return 0;
       strm = &(gz->strm);
       strm->next_in = (void *)buf;
       strm->avail_in = len;
       do {
           strm->next_out = out;
           strm->avail_out = BUFLEN;
           (void)deflate(strm, Z_NO_FLUSH);
           fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);
       } while (strm->avail_out == 0);
       return len;
   }
   
   int gzread OF((gzFile, void *, unsigned));
   
   int gzread(gz, buf, len)
       gzFile gz;
       void *buf;
       unsigned len;
   {
       int ret;
       unsigned got;
       unsigned char in[1];
       z_stream *strm;
   
       if (gz == NULL || gz->write)
           return 0;
       if (gz->err)
           return 0;
       strm = &(gz->strm);
       strm->next_out = (void *)buf;
       strm->avail_out = len;
       do {
           got = fread(in, 1, 1, gz->file);
           if (got == 0)
               break;
           strm->next_in = in;
           strm->avail_in = 1;
           ret = inflate(strm, Z_NO_FLUSH);
           if (ret == Z_DATA_ERROR) {
               gz->err = Z_DATA_ERROR;
               gz->msg = strm->msg;
               return 0;
           }
           if (ret == Z_STREAM_END)
               inflateReset(strm);
       } while (strm->avail_out);
       return len - strm->avail_out;
   }
   
   int gzclose OF((gzFile));
   
   int gzclose(gz)
       gzFile gz;
   {
       z_stream *strm;
       unsigned char out[BUFLEN];
   
       if (gz == NULL)
           return Z_STREAM_ERROR;
       strm = &(gz->strm);
       if (gz->write) {
           strm->next_in = Z_NULL;
           strm->avail_in = 0;
           do {
               strm->next_out = out;
               strm->avail_out = BUFLEN;
               (void)deflate(strm, Z_FINISH);
               fwrite(out, 1, BUFLEN - strm->avail_out, gz->file);
           } while (strm->avail_out == 0);
           deflateEnd(strm);
       }
       else
           inflateEnd(strm);
       fclose(gz->file);
       free(gz);
       return Z_OK;
   }
   
   const char *gzerror OF((gzFile, int *));
   
   const char *gzerror(gz, err)
       gzFile gz;
       int *err;
   {
       *err = gz->err;
       return gz->msg;
   }
   
   #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;
   }

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