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This commit is contained in:
mamehaze 2015-01-21 19:21:00 +00:00
parent c96597932e
commit d0c41baa6a
2 changed files with 38 additions and 8 deletions
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41
src/mame/machine/315-5881_crypt.c
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@ -664,17 +664,18 @@ void sega_315_5881_crypt_device::enc_start()
// deathcox and others confirm format as 0x20000 bit as compressed bit, 0x1ff00 bits as block size 1, 0x000ff bits as block size 2
// for compressed streams the 'line size' is block size 1.
int blockx = ((dec_header & 0x000000ff) >> 0) + 1;
block_numlines = ((dec_header & 0x000000ff) >> 0) + 1;
int blocky = ((dec_header & 0x0001ff00) >> 8) + 1;
block_size = blockx * blocky;
block_size = block_numlines * blocky;
if(dec_header & FLAG_COMPRESSED) {
line_buffer_size = blocky;
line_buffer_pos = line_buffer_size;
buffer_bit = 7;
buffer_bit2 = 15;
}
// printf("header %08x\n", dec_header);
printf("header %08x\n", dec_header);
enc_ready = true;
}
@ -775,9 +776,27 @@ const UINT8 sega_315_5881_crypt_device::trees[9][2][32] = {
int sega_315_5881_crypt_device::get_compressed_bit()
{
if(buffer_pos == BUFFER_SIZE)
enc_fill();
int res = (buffer[buffer_pos^1] >> buffer_bit) & 1;
// if(buffer_pos == BUFFER_SIZE)
// enc_fill();
if (buffer_bit2 == 15)
{
buffer_bit2 = 0;
UINT16 buffer2a = get_decrypted_16();
buffer2[0] = buffer2a;
buffer2[1] = buffer2a >> 8;
// block_pos+=2;
buffer_pos = 0;
}
else
{
buffer_bit2++;
}
// if (buffer_bit ==7) printf("using byte %02x\n", buffer2[(buffer_pos&1) ^ 1]);
int res = (buffer2[(buffer_pos&1)^1] >> buffer_bit) & 1;
buffer_bit--;
if(buffer_bit == -1) {
buffer_bit = 7;
@ -785,7 +804,6 @@ int sega_315_5881_crypt_device::get_compressed_bit()
}
return res;
}
void sega_315_5881_crypt_device::line_fill()
{
assert(line_buffer_pos == line_buffer_size);
@ -838,4 +856,13 @@ void sega_315_5881_crypt_device::line_fill()
}
}
}
if (block_numlines == block_pos)
{
enc_start();
}
else
{
block_pos++;
}
}

5
src/mame/machine/315-5881_crypt.h
View File

@ -56,9 +56,12 @@ private:
bool enc_ready;
int buffer_pos, line_buffer_pos, line_buffer_size, buffer_bit;
int buffer_pos, line_buffer_pos, line_buffer_size, buffer_bit, buffer_bit2;
UINT8 buffer2[2];
int block_size;
int block_pos;
int block_numlines;
struct sbox {
UINT8 table[64];