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inflate.c

/* $Id: inflate.c,v 1.7 2002/01/31 18:28:24 ukai Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>

#undef BUFSIZE
#define BUFSIZE 4096

static char dummy_head[1 + 1] = {
    0x8 + 0x7 * 0x10,
    (((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
};

int
main(int argc, char **argv)
{
    z_stream s;
    FILE *f;
    char inbuf[BUFSIZE], outbuf[BUFSIZE];
    int status, flush, retry = 0, len = 0;

    if (argc > 1) {
      f = fopen(argv[1], "rb");
      if (!f) {
          fprintf(stderr, "%s: cannot open %s\n", argv[0], argv[1]);
          exit(1);
      }
    }
    else
      f = stdin;

    s.zalloc = Z_NULL;
    s.zfree = Z_NULL;
    s.opaque = Z_NULL;
    status = inflateInit(&s);
    if (status != Z_OK) {
      fprintf(stderr, "%s: inflateInit() %s\n", argv[0], zError(status));
      exit(1);
    }
    s.avail_in = 0;
    s.next_out = (Bytef *) outbuf;
    s.avail_out = sizeof(outbuf);
    flush = Z_NO_FLUSH;
    while (1) {
      if (s.avail_in == 0) {
          s.next_in = (Bytef *) inbuf;
          len = s.avail_in = fread(inbuf, 1, sizeof(inbuf), f);
      }
      status = inflate(&s, flush);
      if (status == Z_STREAM_END || status == Z_BUF_ERROR) {
          if (sizeof(outbuf) - s.avail_out)
            fwrite(outbuf, 1, sizeof(outbuf) - s.avail_out, stdout);
          break;
      }
      if (status == Z_DATA_ERROR && !retry++) {
          status = inflateReset(&s);
          if (status != Z_OK) {
            fprintf(stderr, "%s: inflateReset() %s\n", argv[0],
                  zError(status));
            exit(1);
          }
          s.next_in = (Bytef *) dummy_head;
          s.avail_in = sizeof(dummy_head);
          status = inflate(&s, flush);
          s.next_in = (Bytef *) inbuf;
          s.avail_in = len;
          continue;
      }
      if (status != Z_OK) {
          fprintf(stderr, "%s: inflate() %s\n", argv[0], zError(status));
          exit(1);
      }
      if (s.avail_out == 0) {
          fwrite(outbuf, 1, sizeof(outbuf), stdout);
          s.next_out = (Bytef *) outbuf;
          s.avail_out = sizeof(outbuf);
      }
      retry = 1;
    }
    inflateEnd(&s);
    fclose(f);
    return 0;
}

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