/* minigzip.c -- simulate gzip using the zlib compression library
 * Copyright (C) 1995-2006, 2010, 2011, 2016 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

#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

static char *prog;

void error            OF((const char *msg));
void gz_compress      OF((FILE   *in, gzFile out));
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[]));

/* ===========================================================================
 * Compress input to output then close both files.
 */

void gz_compress(in, out)
    FILE   *in;
    gzFile out;
{
    local char buf[BUFLEN];
    int len;
	int ret = 0;

    for (;;) {
        len = (int)fread(buf, 1, sizeof(buf), in);
        if (len == 0) break;
		ret = gzwrite(out, buf, (unsigned)len);
        if (ret != len) 
			printf("wrong gzwrite:%d,ret:%d\n", len, ret);
    }
    fclose(in);
    gzclose(out);
}



/* ===========================================================================
 * 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);
    }

#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
    snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX);
#else
    strcpy(outfile, file);
    strcat(outfile, GZ_SUFFIX);
#endif

    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);
}


/* ===========================================================================
 * 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];

#if !defined(NO_snprintf) && !defined(NO_vsnprintf)
    snprintf(outmode, sizeof(outmode), "%s", "wb6 ");
#else
    strcpy(outmode, "wb6 ");
#endif

    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;
	{
        do {
			{
                if (copyout) {
                    FILE * in = fopen(*argv, "rb");

                    if (in == NULL) {
                        perror(*argv);
                    } else {
                        file = gzdopen(fileno(stdout), outmode);
                        if (file == NULL) printf("can't gzdopen stdout");

                        gz_compress(in, file);
                    }

                } else {
					printf("outmode:%s\n",outmode);
                    file_compress(*argv, outmode);
                }
            }
        } while (argv++, --argc);
    }
    return 0;
}