//
// srecord - Manipulate EPROM load files
// Copyright (C) 2009-2011 Peter Miller
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 3 of the License, or (at
// your option) any later version.
//
// This program 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 Lesser General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//

#include <srecord/bitrev.h>


static unsigned char table[256] =
{
    0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
    0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
    0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
    0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
    0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
    0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
    0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
    0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
    0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
    0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
    0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
    0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
    0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
    0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
    0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
    0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
    0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
    0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
    0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
    0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
    0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
    0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
    0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
    0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
    0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
    0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
    0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
    0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
    0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
    0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
    0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
    0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF,
};


unsigned char
srecord::bitrev8(unsigned char value)
{
    return table[value];
}


unsigned short
srecord::bitrev16(unsigned short value)
{
    // could make this faster with a table,
    // but is it worth it?
    unsigned char hi1(value >> 8);
    unsigned char lo1(value);
    unsigned short hi2(bitrev8(lo1));
    unsigned char lo2(bitrev8(hi1));
    // hi2 must have same type as return
    return ((hi2 << 8) | lo2);
}


unsigned long
srecord::bitrev24(unsigned long value)
{
    unsigned char hi1(value >> 16);
    unsigned short lo1(value);
    unsigned long hi2(bitrev16(lo1));
    unsigned char lo2(bitrev8(hi1));
    // hi2 must have same type as return
    return ((hi2 << 8) | lo2);
}


unsigned long
srecord::bitrev32(unsigned long value)
{
    unsigned short hi1(value >> 16);
    unsigned short lo1(value);
    unsigned long hi2(bitrev16(lo1));
    unsigned short lo2(bitrev16(hi1));
    // hi2 must have same type as return
    return ((hi2 << 16) | lo2);
}


unsigned long long
srecord::bitrev40(unsigned long long value)
{
    unsigned char hi1(value >> 32);
    unsigned long lo1(value);
    unsigned long long hi2(bitrev32(lo1));
    unsigned char lo2(bitrev8(hi1));
    // hi2 must have same type as return
    return ((hi2 << 8) | lo2);
}


unsigned long long
srecord::bitrev48(unsigned long long value)
{
    unsigned short hi1(value >> 32);
    unsigned long lo1(value);
    unsigned long long hi2(bitrev32(lo1));
    unsigned short lo2(bitrev16(hi1));
    // hi2 must have same type as return
    return ((hi2 << 16) | lo2);
}


unsigned long long
srecord::bitrev56(unsigned long long value)
{
    unsigned long hi1(value >> 32);
    unsigned long lo1(value);
    unsigned long long hi2(bitrev32(lo1));
    unsigned long lo2(bitrev24(hi1));
    // hi2 must have same type as return
    return ((hi2 << 24) | lo2);
}


unsigned long long
srecord::bitrev64(unsigned long long value)
{
    unsigned long hi1(value >> 32);
    unsigned long lo1(value);
    unsigned long long hi2 = bitrev32(lo1);
    unsigned long lo2 = bitrev32(hi1);
    // hi2 must have same type as return
    return ((hi2 << 32) | lo2);
}


// vim: set ts=8 sw=4 et :
