/*
 *   Copyright 2003-2004 The Apache Software Foundation.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

// !!! This include file must be first thing in file !!!
#include "../platforms/PlatformAutoSense.hpp"

#include "HexCoder.h"

#include "../common/AxisTrace.h"

const static char s_HexToNumTable[256]=
{
/* following is for ascii characters */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 00  - 15  */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 16  - 31  */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 32  - 47  */
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0,  /* 48  - 63  */
    0,10,11,12,13,14,15, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 64  - 79  */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 80  - 95  */
    0,10,11,12,13,14,15, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 96  - 111 */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 112 - 127 */
/* Following is for ebcdic characters */
    0,10,11,12,13,14,15, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 128 - 143 */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 144 - 159 */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 160 - 175 */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 176 - 191 */
    0,10,11,12,13,14,15, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 192 - 207 */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 208 - 223 */
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 224 - 239 */
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0,  /* 240 - 255 */
};

    
const static char s_NumToHexTable[16] =
{
    '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
};

int Hex_Encode(char * coded_dst, const unsigned char *plain_src,
               int len_plain_src)
{
    const unsigned char *cur = plain_src;
    const unsigned char *end = cur + len_plain_src;
    while(cur < end)
    {
        *coded_dst = s_NumToHexTable[(*cur) >> 4];
        coded_dst++;
        *coded_dst = s_NumToHexTable[(*cur)& 0x0f];
        coded_dst++;
        cur++;
    }
    return 0;
}

int Hex_Decode(unsigned char * plain_dst, const char *coded_src)
{
    unsigned char* curr = plain_dst;
    while (*coded_src != '\0')
    {
        *curr = (s_HexToNumTable[(int)(*coded_src)] << 4) | 
            s_HexToNumTable[(int)(*(coded_src+1))];
        curr++;
        coded_src+=2;
    }
    return (int)(curr-plain_dst);
}