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/* uclpack.c -- example program: a simple file packer

   This file is part of the UCL data compression library.

   Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer

   All Rights Reserved.

   The UCL library is free software; you can redistribute it and/or

   modify it under the terms of the GNU General Public License as

   published by the Free Software Foundation; either version 2 of

   the License, or (at your option) any later version.

   The UCL library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with the UCL library; see the file COPYING.

   If not, write to the Free Software Foundation, Inc.,

   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

   Markus F.X.J. Oberhumer

   <markus@oberhumer.com>

 */

/*************************************************************************

// NOTE: this is an example program, so do not use to backup your data

//

// This program lacks things like sophisticated file handling but is

// pretty complete regarding compression - it should provide a good

// starting point for adaption for you applications.

**************************************************************************/

#include <ucl/ucl.h>

#include "lutil.h"

static const char *progname = NULL;

static unsigned long total_in = 0;

static unsigned long total_out = 0;

/* magic file header for compressed files */

static const unsigned char magic[8] =

    { 0x00, 0xe9, 0x55, 0x43, 0x4c, 0xff, 0x01, 0x1a };

/*************************************************************************

// file IO

**************************************************************************/

ucl_uint xread(FILE *f, ucl_voidp buf, ucl_uint len, ucl_bool allow_eof)

{

    ucl_uint l;

    l = ucl_fread(f,buf,len);

    if (l > len)

    {

        fprintf(stderr,"\nsomething's wrong with your C library !!!\n");

        exit(1);

    }

    if (l != len && !allow_eof)

    {

        fprintf(stderr,"\nread error - premature end of file\n");

        exit(1);

    }

    total_in += l;

    return l;

}

ucl_uint xwrite(FILE *f, const ucl_voidp buf, ucl_uint len)

{

    ucl_uint l;

    if (f != NULL)

    {

        l = ucl_fwrite(f,buf,len);

        if (l != len)

        {

            fprintf(stderr,"\nwrite error [%ld %ld]  (disk full ?)\n",

                   (long)len, (long)l);

            exit(1);

        }

    }

    total_out += len;

    return len;

}

int xgetc(FILE *f)

{

    unsigned char c;

    xread(f,(ucl_voidp) &c,1,0);

    return c;

}

void xputc(FILE *f, int c)

{

    unsigned char cc = (unsigned char) c;

    xwrite(f,(const ucl_voidp) &cc,1);

}

/* read and write portable 32-bit integers */

ucl_uint32 xread32(FILE *f)

{

    unsigned char b[4];

    ucl_uint32 v;

    xread(f,b,4,0);

    v  = (ucl_uint32) b[3] <<  0;

    v |= (ucl_uint32) b[2] <<  8;

    v |= (ucl_uint32) b[1] << 16;

    v |= (ucl_uint32) b[0] << 24;

    return v;

}

void xwrite32(FILE *f, ucl_uint32 v)

{

    unsigned char b[4];

    b[3] = (unsigned char) (v >>  0);

    b[2] = (unsigned char) (v >>  8);

    b[1] = (unsigned char) (v >> 16);

    b[0] = (unsigned char) (v >> 24);

    xwrite(f,b,4);

}

/*************************************************************************

// compress

**************************************************************************/

int do_compress(FILE *fi, FILE *fo, ucl_uint size)

{

    int r = 0;

    ucl_byte *in = NULL;

    ucl_byte *out = NULL;

    ucl_uint in_len;

    ucl_uint out_len;

    ucl_uint overhead = 4*size;

    total_in = total_out = 0;

/*

 * Step 1: allocate compression buffers and work-memory

 */

    in = (ucl_byte *) ucl_malloc(size);

    out = (ucl_byte *) ucl_malloc(size + overhead);

    if (in == NULL || out == NULL)

    {

        printf("%s: out of memory\n", progname);

        r = 1;

        goto err;

    }

/*

 * Step 2: compress (single block)

 */

    /* read block */

    in_len = xread(fi,in,size,1);

    r = ucl_nrv2e_decompress_safe_8(in,in_len,out,&out_len,NULL);

    if (r != UCL_E_OK || out_len > in_len + overhead)

    {

        /* this should NEVER happen */

        printf("internal error - decompression failed: %d\n", r);

        r = 2;

        goto err;

    }

    xwrite(fo,out,out_len);

    r = 0;

err:

    ucl_free(out);

    ucl_free(in);

    return r;

}

/*************************************************************************

//

**************************************************************************/

static void usage(void)

{

    printf("usage: %s input-file output-file  (decompress)\n", progname);

    exit(1);

}

/* open input file */

static FILE *xopen_fi(const char *name)

{

    FILE *f;

    f = fopen(name,"rb");

    if (f == NULL)

    {

        printf("%s: cannot open input file %s\n", progname, name);

        exit(1);

    }

#if defined(HAVE_STAT) && defined(S_ISREG)

    {

        struct stat st;

#if defined(HAVE_LSTAT)

        if (lstat(name,&st) != 0 || !S_ISREG(st.st_mode))

#else

        if (stat(name,&st) != 0 || !S_ISREG(st.st_mode))

#endif

        {

            printf("%s: %s is not a regular file\n", progname, name);

            fclose(f);

            exit(1);

        }

    }

#endif

    return f;

}

/* open output file */

static FILE *xopen_fo(const char *name)

{

    FILE *f;

#if 0

    /* this is an example program, so make sure we don't overwrite a file */

    f = fopen(name,"rb");

    if (f != NULL)

    {

        printf("%s: file %s already exists -- not overwritten\n", progname, name);

        fclose(f);

        exit(1);

    }

#endif

    f = fopen(name,"wb");

    if (f == NULL)

    {

        printf("%s: cannot open output file %s\n", progname, name);

        exit(1);

    }

    return f;

}

/*************************************************************************

//

**************************************************************************/

int main(int argc, char *argv[])

{

    int i = 1;

    int r = 0;

    FILE *fi = NULL;

    FILE *fo = NULL;

    const char *in_name = NULL;

    const char *out_name = NULL;

    int size;

    const char *s;

#if defined(__EMX__)

    _response(&argc,&argv);

    _wildcard(&argc,&argv);

#endif

    progname = argv[0];

    for (s = progname; *s; s++)

        if (*s == '/' || *s == '\\')

            progname = s + 1;

    printf("\nUCL real-time data compression library (v%s, %s).\n",

            ucl_version_string(), ucl_version_date());

    printf("Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer\n\n");

/*

 * Step 1: initialize the UCL library

 */

    if (ucl_init() != UCL_E_OK)

    {

        printf("ucl_init() failed !!!\n");

        exit(1);

    }

    if (i + 2 != argc)

        usage();

/*

 * Step 2: process file(s)

 */

    in_name = argv[i++];

    out_name = argv[i++];

    fi = xopen_fi(in_name);

    fo = xopen_fo(out_name);

    fseek(fi, 0, SEEK_END);

    size = ftell(fi);

    fseek(fi, 0, SEEK_SET);

    r = do_compress(fi,fo,size);

    if (r == 0)

        printf("%s: algorithm NRV2E-99/10-singleblk, decompressed %ld into %ld bytes\n",

                progname, total_in, total_out);

quit:

    if (fi) fclose(fi);

    if (fo) fclose(fo);

    return r;

}