/*
#
# Collective Tuning Run-Time
# Part of Collective Mind
#
# See cM LICENSE.txt for licensing details.
# See cM Copyright.txt for copyright details.
#
*/

#include <stdio.h>
#include <stdlib.h>

#ifdef OPENME
#include <openme.h>
#endif
#ifdef XOPENME
#include <xopenme.h>
#endif

#include <string.h>
#include <assert.h>
#include "zlib.h"

#if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
#  include <fcntl.h>
#  include <io.h>
#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
#  define SET_BINARY_MODE(file)
#endif

#define CHUNK 16384

/* Compress from file source to file dest until EOF on source.
   def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
   allocated for processing, Z_STREAM_ERROR if an invalid compression
   level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
   version of the library linked do not match, or Z_ERRNO if there is
   an error reading or writing the files. */
int def(FILE *source, FILE *dest, int level)
{
    int ret, flush;
    unsigned have;
    z_stream strm;
    unsigned char in[CHUNK];
    unsigned char out[CHUNK];

    /* allocate deflate state */
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    ret = deflateInit(&strm, level);
    if (ret != Z_OK)
        return ret;

    /* compress until end of file */
    do {
        strm.avail_in = fread(in, 1, CHUNK, source);
        if (ferror(source)) {
            (void)deflateEnd(&strm);
            return Z_ERRNO;
        }
        flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
        strm.next_in = in;

        /* run deflate() on input until output buffer not full, finish
           compression if all of source has been read in */
        do {
            strm.avail_out = CHUNK;
            strm.next_out = out;
            ret = deflate(&strm, flush);    /* no bad return value */
            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
            have = CHUNK - strm.avail_out;
            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
                (void)deflateEnd(&strm);
                return Z_ERRNO;
            }
        } while (strm.avail_out == 0);
        assert(strm.avail_in == 0);     /* all input will be used */

        /* done when last data in file processed */
    } while (flush != Z_FINISH);
    assert(ret == Z_STREAM_END);        /* stream will be complete */

    /* clean up and return */
    (void)deflateEnd(&strm);
    return Z_OK;
}

/* Decompress from file source to file dest until stream ends or EOF.
   inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
   allocated for processing, Z_DATA_ERROR if the deflate data is
   invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
   the version of the library linked do not match, or Z_ERRNO if there
   is an error reading or writing the files. */
int inf(FILE *source, FILE *dest)
{
    int ret;
    unsigned have;
    z_stream strm;
    unsigned char in[CHUNK];
    unsigned char out[CHUNK];

    /* allocate inflate state */
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    strm.avail_in = 0;
    strm.next_in = Z_NULL;
    ret = inflateInit(&strm);
    if (ret != Z_OK)
        return ret;

    /* decompress until deflate stream ends or end of file */
    do {
        strm.avail_in = fread(in, 1, CHUNK, source);
        if (ferror(source)) {
            (void)inflateEnd(&strm);
            return Z_ERRNO;
        }
        if (strm.avail_in == 0)
            break;
        strm.next_in = in;

        /* run inflate() on input until output buffer not full */
        do {
            strm.avail_out = CHUNK;
            strm.next_out = out;
            ret = inflate(&strm, Z_NO_FLUSH);
            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
            switch (ret) {
            case Z_NEED_DICT:
                ret = Z_DATA_ERROR;     /* and fall through */
            case Z_DATA_ERROR:
            case Z_MEM_ERROR:
                (void)inflateEnd(&strm);
                return ret;
            }
            have = CHUNK - strm.avail_out;
            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
                (void)inflateEnd(&strm);
                return Z_ERRNO;
            }
        } while (strm.avail_out == 0);

        /* done when inflate() says it's done */
    } while (ret != Z_STREAM_END);

    /* clean up and return */
    (void)inflateEnd(&strm);
    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}

/* report a zlib or i/o error */
void zerr(int ret)
{
    fputs("zpipe: ", stderr);
    switch (ret) {
    case Z_ERRNO:
        if (ferror(stdin))
            fputs("error reading stdin\n", stderr);
        if (ferror(stdout))
            fputs("error writing stdout\n", stderr);
        break;
    case Z_STREAM_ERROR:
        fputs("invalid compression level\n", stderr);
        break;
    case Z_DATA_ERROR:
        fputs("invalid or incomplete deflate data\n", stderr);
        break;
    case Z_MEM_ERROR:
        fputs("out of memory\n", stderr);
        break;
    case Z_VERSION_ERROR:
        fputs("zlib version mismatch!\n", stderr);
    }
}

int main(int argc, char* argv[])
{
  long ct_repeat=0;
  long ct_repeat_max=1;
  int ct_return=0;

  int decode;
  char* source_file;
  char* dest_file;
  FILE* source_fp;
  FILE* dest_fp;

#ifdef OPENME
  openme_init(NULL,NULL,NULL,0);
  openme_callback("PROGRAM_START", NULL);
#endif
#ifdef XOPENME
  xopenme_init(1,0);
#endif

  if (getenv("CT_REPEAT_MAIN")!=NULL) ct_repeat_max=atol(getenv("CT_REPEAT_MAIN"));
              
#ifdef OPENME
  openme_callback("KERNEL_START", NULL);
#endif
#ifdef XOPENME
  xopenme_clock_start(0);
#endif

  if (argc != 4) {
    fputs("usage: < --decode | --encode > < source > < dest >\n", stderr);
    ct_return = 1;
    goto end;
  }
  if (strcmp(argv[1], "--decode") == 0) {
    decode = 1;
  } else if (strcmp(argv[1], "--encode") == 0) {
    decode = 0;
  } else {
    fputs("usage: < --decode | --encode > < source > < dest >\n", stderr);
    ct_return = 1;
    goto end;
  }
  source_file = argv[2];
  dest_file = argv[3];

  /* avoid end-of-line conversions */
  SET_BINARY_MODE(stdin);
  SET_BINARY_MODE(stdout);

  for (ct_repeat=0; ct_repeat<ct_repeat_max; ct_repeat++) {
    source_fp = fopen(source_file, "rb");
    if (NULL == source_fp) {
      fputs("Failed to open source file\n", stderr);
      ct_return = 1;
      goto end;
    }
    dest_fp = fopen(dest_file, "wb");
    if (NULL == dest_fp) {
      fputs("Failed to open dest file\n", stderr);
      fclose(source_fp);
      ct_return = 1;
      goto end;
    }
    if (decode) {
      ct_return = inf(source_fp, dest_fp);
    } else {
      ct_return = def(source_fp, dest_fp, Z_DEFAULT_COMPRESSION);
    }
    fclose(source_fp);
    fclose(dest_fp);
  }

end:
    
#ifdef XOPENME
  xopenme_clock_end(0);
#endif
#ifdef OPENME
  openme_callback("KERNEL_END", NULL);
#endif

#ifdef XOPENME
  xopenme_dump_state();
  xopenme_finish();
#endif
#ifdef OPENME
  openme_callback("PROGRAM_END", NULL);
#endif

  return ct_return;
}