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/* wrap.c */

/*

This Software is distributed with the following X11 License,

sometimes also known as MIT license.

Copyright (c) 2010 Miguel A. Ballicora

 Permission is hereby granted, free of charge, to any person

 obtaining a copy of this software and associated documentation

 files (the "Software"), to deal in the Software without

 restriction, including without limitation the rights to use,

 copy, modify, merge, publish, distribute, sublicense, and/or sell

 copies of the Software, and to permit persons to whom the

 Software is furnished to do so, subject to the following

 conditions:

 The above copyright notice and this permission notice shall be

 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 OTHER DEALINGS IN THE SOFTWARE.

*/

#include "wrap.h"

#if defined(LZMA86)

#include "Lzma86Enc.h"

#include "Lzma86Dec.h"

#endif

#if defined(ZLIB)

#include "zlib.h"

#endif

#if defined(HUFFMAN)

#include "hzip.h"

#endif

#if defined(LIBLZF)

#include "lzf.h"

#endif

#if defined(LIBBZIP2)

#include "bzlib.h"

#endif

#if !defined(NDEBUG)

#define NDEBUG

#endif

#ifdef DEBUG

#undef NDEBUG

#endif

#include "assert.h"

/* external, so the compiler can be silenced */

size_t TB_DUMMY_unused;

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

#if defined(ZLIB)

extern int

zlib_encode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        enum COMPRESSION_LEVELS {ZLIB_MAXIMUM_COMPRESSION = 9};

        int outcome;

        unsigned long zz = (unsigned long)out_max;

        outcome = compress2 (out_start, &zz, in_start, in_len, ZLIB_MAXIMUM_COMPRESSION);

        *pout_len = (size_t) zz;

        return outcome == Z_OK;

}

extern int

zlib_decode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        int outcome;

        unsigned long nn = (unsigned long) out_max /* *pout_len */;

        outcome = uncompress (out_start, &nn, in_start, (unsigned long)in_len);

        *pout_len = (size_t)nn;

        return outcome == Z_OK;

}

#endif

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

#if defined(LIBLZF)

extern int

lzf_encode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        size_t x = lzf_compress (in_start, (unsigned)in_len, out_start, (unsigned)(in_len-1) /* ensures best compression */);

        TB_DUMMY_unused = out_max;

        if (x != 0)

                *pout_len = (size_t) x;

        return x != 0;

}

extern int

lzf_decode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        *pout_len = (size_t)lzf_decompress (in_start, (unsigned)in_len, out_start, (unsigned)out_max);

        return *pout_len != 0;

}

#endif

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

#if defined(LZMA86)

extern int

lzma_encode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        int level  =    5;                      /* 5 => default compression level */

        unsigned int memory = 4096;     /* dictionary size */

        int filter = SZ_FILTER_NO;      /* => 0, use LZMA, do not try to optimize with x86 filter */

        size_t zz  = out_max;           /* maximum memory allowed, receives back the actual size */

        int x      = Lzma86_Encode(out_start, &zz, in_start, in_len, level, memory, filter);

        *pout_len  = zz;

        return x == 0;

}

extern int

lzma_decode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

                size_t nn = out_max;

                int x = Lzma86_Decode(out_start, &nn, in_start, &in_len);

                *pout_len = nn;

                return x == SZ_OK;

}

#endif

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

#if defined (LIBBZIP2)

extern int

bzip2_encode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        int     blockSize100k =  9;

        int verbosity     =  0;

        int workFactor    = 30;

        size_t destlen    = out_max;

        int x = BZ2_bzBuffToBuffCompress( (char*)out_start, &destlen, (char*)in_start, in_len,

                                                                blockSize100k, verbosity, workFactor);

        *pout_len = destlen;

        return x == BZ_OK;

}

extern int

bzip2_decode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        int     small      = 1;

        int verbosity  = 0;

        size_t destlen = n;

        int x = BZ2_bzBuffToBuffDecompress( (char*)out_start, &destlen, (char*)in_start, in_len,

                               small, verbosity);

        *pout_len = destlen;

        return x == BZ_OK;

}

#endif

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

extern int

justcopy_encode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        size_t i;

        const unsigned char *in  = in_start;

                  unsigned char *out = out_start;

        if (in_len > out_max)

                return 0;

        for (i = 0; i < in_len; i++) {

                *out++ = *in++;

        }

        *pout_len = in_len;

        return 1;

}

extern int

justcopy_decode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        size_t i;

        const unsigned char *in  = in_start;

                  unsigned char *out = out_start;

        if (in_len > out_max)

                return 0;

        for (i = 0; i < in_len; i++) {

                *out++ = *in++;

        }

        *pout_len = in_len;

        return 1;

}

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

#define RLE_ESC 253

#define RLE_TER 254

#define RLE_MAX 252

#define TRUE 1

#define FALSE 0

extern int

rle_encode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        const unsigned char *p;

        const unsigned char *in      = in_start;

        const unsigned char *in_end  = in  + in_len;

        unsigned char       *out     = out_start;

        int ok = TRUE;

        int ch;

        ptrdiff_t out_len;

        while (in < in_end)

        {

                if (*in == RLE_ESC) {

                        *out++ = RLE_ESC;

                        *out++ = RLE_ESC;

                        in++;

                } else {

                        ch = *in;

                        if ( (in_end-in) >= 3 /* enough space for a run */

                                && ch == in[1] && ch == in[2] && ch == in[3] /* enough length */) {

                                p = in;

                                while (p < in_end && *p == ch && (p-in) < RLE_MAX) {

                                        p++;

                                }

                                *out++ = RLE_ESC;

                                assert (RLE_MAX < 256);

                                *out++ = (unsigned char)(p - in);

                                *out++ = (unsigned char)ch;

                                in = p;

                        } else {

                                *out++ = *in++;

                        }

                }

        }

        if (ok) {

                /*      *out++ = RLE_ESC; *out++ = RLE_TER; */

                out_len = out - out_start;

                *pout_len = (size_t)out_len;

                ok = (size_t)out_len <= out_max;

        }

        return ok;

}

extern int

rle_decode

(const unsigned char *in_start, size_t in_len, unsigned char *out_start, size_t *pout_len, size_t out_max)

{

        const unsigned char *in  = in_start;

        const unsigned char *in_end  = in  + in_len;

                  unsigned char *out = out_start;

                  unsigned char *out_end = out + *pout_len;

        int ok = TRUE;

        int ch;

        int n;

        ptrdiff_t out_len;

        while (in < in_end)

        {

                                                                        if (in  >=  in_end) { ok = FALSE; break;}

                                                                        if (out >= out_end) { ok = FALSE; break;}

                if (*in == RLE_ESC) {

                        ++in;                                   if (in >= in_end) { ok = FALSE; break;}

                        if (*in == RLE_ESC) {

                                *out++ = *in++;

                        } /*else if (*in == RLE_TER) {ok = TRUE;break;} */ else {

                                /* rle */

                                n  = *in++;             if (in >= in_end) { ok = FALSE; break;}

                                ch = *in++;

                                while (n-->0) {         if (out >= out_end) { ok = FALSE; break;}

                                        *out++ = (unsigned char)ch;

                                }

                        }

                } else {

                        *out++ = *in++;

                }

        }

        out_len = out - out_start;

        if (ok)

                *pout_len = (size_t)out_len;

        ok = ok && (out_max >= (size_t)out_len);

        return ok;

}