// Run length encoding plus LZ compression plus Huffman encoding
private void cpt_rle_lzh()
{
uint bptr;
int Huffchar, LZlength, LZoffs;
get_bit = cpt_getbit;
cpt_LZbuff[CIRCSIZE - 3] = 0;
cpt_LZbuff[CIRCSIZE - 2] = 0;
cpt_LZbuff[CIRCSIZE - 1] = 0;
cpt_LZptr = 0;
while (cpt_outlength != 0)
{
cpt_readHuff(256, cpt_Hufftree);
cpt_readHuff(64, cpt_LZlength);
cpt_readHuff(128, cpt_LZoffs);
int block_count = 0;
cpt_newbits = (uint)(cpt_data[cpt_char++] << 8);
cpt_newbits = cpt_newbits | cpt_data[cpt_char++];
cpt_newbits = cpt_newbits << 16;
cpt_bitsavail = 16;
while (block_count < cpt_blocksize && cpt_outlength != 0)
{
if (cpt_getbit() != 0)
{
Huffchar = gethuffbyte(cpt_Hufftree[0]);
cpt_outch((byte)Huffchar);
block_count += 2;
}
else
{
LZlength = gethuffbyte(cpt_LZlength[0]);
LZoffs = gethuffbyte(cpt_LZoffs[0]);
LZoffs = (LZoffs << 6) | cpt_get6bits();
bptr = (uint)(cpt_LZptr - LZoffs);
while (LZlength-- > 0)
{
cpt_outch(cpt_LZbuff[bptr++ & (CIRCSIZE - 1)]);
}
block_count += 3;
}
}
}
}
// Run length encoding plus LZ compression plus Huffman encoding
private void cpt_rle_lzh()
{
uint bptr;
int Huffchar, LZlength, LZoffs;
get_bit = cpt_getbit;
cpt_LZbuff[CIRCSIZE - 3] = 0;
cpt_LZbuff[CIRCSIZE - 2] = 0;
cpt_LZbuff[CIRCSIZE - 1] = 0;
cpt_LZptr = 0;
while (cpt_outlength != 0)
{
cpt_readHuff(256, cpt_Hufftree);
cpt_readHuff(64, cpt_LZlength);
cpt_readHuff(128, cpt_LZoffs);
int block_count = 0;
cpt_newbits = (uint)(cpt_data[cpt_char++] << 8);
cpt_newbits = cpt_newbits | cpt_data[cpt_char++];
cpt_newbits = cpt_newbits << 16;
cpt_bitsavail = 16;
while (block_count < cpt_blocksize && cpt_outlength != 0)
{
if (cpt_getbit() != 0)
{
Huffchar = gethuffbyte(cpt_Hufftree[0]);
cpt_outch((byte)Huffchar);
block_count += 2;
}
else
{
LZlength = gethuffbyte(cpt_LZlength[0]);
LZoffs = gethuffbyte(cpt_LZoffs[0]);
LZoffs = (LZoffs << 6) | cpt_get6bits();
bptr = (uint)(cpt_LZptr - LZoffs);
while (LZlength-- > 0)
{
cpt_outch(cpt_LZbuff[bptr++ & (CIRCSIZE - 1)]);
}
block_count += 3;
}
}
}
}
