static void input_handle_th(void *p)
{
char c;
int b = 0;
setsockopt(ihpipe[1], SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b));
while (1) if (read(0, &c, 1) == 1) be_write(ihpipe[1], &c, 1);
}
static void be_write_list(struct be_list *list, FILE *out)
{
size_t i;
fputc('l', out);
for(i = 0; i < list->len; i++) {
be_write(list->nodes + i, out);
}
fputc('e', out);
}
static void be_write_dict(struct be_dict *dict, FILE *out)
{
fputc('d', out);
size_t i;
for(i = 0; i < dict->len; i++) {
struct be_str *bstr = dict->pairs[i].key;
be_write_str(bstr, out);
be_write(dict->pairs[i].val, out);
}
fputc('e', out);
}
void chd_file::decompress_v5_map()
{
// if no offset, we haven't written it yet
if (m_mapoffset == 0)
{
memset(m_rawmap, 0xff, m_rawmap.count());
return;
}
// read the reader
UINT8 rawbuf[16];
file_read(m_mapoffset, rawbuf, sizeof(rawbuf));
UINT32 mapbytes = be_read(&rawbuf[0], 4);
UINT64 firstoffs = be_read(&rawbuf[4], 6);
UINT16 mapcrc = be_read(&rawbuf[10], 2);
UINT8 lengthbits = rawbuf[12];
UINT8 selfbits = rawbuf[13];
UINT8 parentbits = rawbuf[14];
// now read the map
dynamic_buffer compressed(mapbytes);
file_read(m_mapoffset + 16, compressed, mapbytes);
bitstream_in bitbuf(compressed, compressed.count());
// first decode the compression types
huffman_decoder<16, 8> decoder;
huffman_error err = decoder.import_tree_rle(bitbuf);
if (err != HUFFERR_NONE)
throw CHDERR_DECOMPRESSION_ERROR;
UINT8 lastcomp = 0;
int repcount = 0;
for (int hunknum = 0; hunknum < m_hunkcount; hunknum++)
{
UINT8 *rawmap = &m_rawmap[hunknum * 12];
if (repcount > 0)
rawmap[0] = lastcomp, repcount--;
else
{
UINT8 val = decoder.decode_one(bitbuf);
if (val == COMPRESSION_RLE_SMALL)
rawmap[0] = lastcomp, repcount = 2 + decoder.decode_one(bitbuf);
else if (val == COMPRESSION_RLE_LARGE)
rawmap[0] = lastcomp, repcount = 2 + 16 + (decoder.decode_one(bitbuf) << 4), repcount += decoder.decode_one(bitbuf);
else
rawmap[0] = lastcomp = val;
}
}
// then iterate through the hunks and extract the needed data
UINT64 curoffset = firstoffs;
UINT32 last_self = 0;
UINT64 last_parent = 0;
for (int hunknum = 0; hunknum < m_hunkcount; hunknum++)
{
UINT8 *rawmap = &m_rawmap[hunknum * 12];
UINT64 offset = curoffset;
UINT32 length = 0;
UINT16 crc = 0;
switch (rawmap[0])
{
// base types
case COMPRESSION_TYPE_0:
case COMPRESSION_TYPE_1:
case COMPRESSION_TYPE_2:
case COMPRESSION_TYPE_3:
curoffset += length = bitbuf.read(lengthbits);
crc = bitbuf.read(16);
break;
case COMPRESSION_NONE:
curoffset += length = m_hunkbytes;
crc = bitbuf.read(16);
break;
case COMPRESSION_SELF:
last_self = offset = bitbuf.read(selfbits);
break;
case COMPRESSION_PARENT:
offset = bitbuf.read(parentbits);
last_parent = offset;
break;
// pseudo-types; convert into base types
case COMPRESSION_SELF_1:
last_self++;
case COMPRESSION_SELF_0:
rawmap[0] = COMPRESSION_SELF;
offset = last_self;
break;
case COMPRESSION_PARENT_SELF:
rawmap[0] = COMPRESSION_PARENT;
last_parent = offset = (UINT64(hunknum) * UINT64(m_hunkbytes)) / m_unitbytes;
break;
case COMPRESSION_PARENT_1:
last_parent += m_hunkbytes / m_unitbytes;
case COMPRESSION_PARENT_0:
rawmap[0] = COMPRESSION_PARENT;
offset = last_parent;
break;
}
be_write(&rawmap[1], length, 3);
be_write(&rawmap[4], offset, 6);
be_write(&rawmap[10], crc, 2);
}
// verify the final CRC
if (crc16_creator::simple(m_rawmap, m_hunkcount * 12) != mapcrc)
throw CHDERR_DECOMPRESSION_ERROR;
}
chd_error chd_file::read_hunk(UINT32 hunknum, void *buffer)
{
// wrap this for clean reporting
try
{
// punt if no file
if (m_file == NULL)
throw CHDERR_NOT_OPEN;
// return an error if out of range
if (hunknum >= m_hunkcount)
throw CHDERR_HUNK_OUT_OF_RANGE;
// get a pointer to the map entry
UINT64 blockoffs;
UINT32 blocklen;
UINT32 blockcrc;
UINT8 *rawmap;
UINT8 *dest = reinterpret_cast<UINT8 *>(buffer);
switch (m_version)
{
// v3/v4 map entries
case 3:
case 4:
rawmap = m_rawmap + 16 * hunknum;
blockoffs = be_read(&rawmap[0], 8);
blockcrc = be_read(&rawmap[8], 4);
switch (rawmap[15] & V34_MAP_ENTRY_FLAG_TYPE_MASK)
{
case V34_MAP_ENTRY_TYPE_COMPRESSED:
blocklen = be_read(&rawmap[12], 2) + (rawmap[14] << 16);
file_read(blockoffs, m_compressed, blocklen);
m_decompressor[0]->decompress(m_compressed, blocklen, dest, m_hunkbytes);
if (!(rawmap[15] & V34_MAP_ENTRY_FLAG_NO_CRC) && dest != NULL && crc32_creator::simple(dest, m_hunkbytes) != blockcrc)
throw CHDERR_DECOMPRESSION_ERROR;
return CHDERR_NONE;
case V34_MAP_ENTRY_TYPE_UNCOMPRESSED:
file_read(blockoffs, dest, m_hunkbytes);
if (!(rawmap[15] & V34_MAP_ENTRY_FLAG_NO_CRC) && crc32_creator::simple(dest, m_hunkbytes) != blockcrc)
throw CHDERR_DECOMPRESSION_ERROR;
return CHDERR_NONE;
case V34_MAP_ENTRY_TYPE_MINI:
be_write(dest, blockoffs, 8);
for (UINT32 bytes = 8; bytes < m_hunkbytes; bytes++)
dest[bytes] = dest[bytes - 8];
if (!(rawmap[15] & V34_MAP_ENTRY_FLAG_NO_CRC) && crc32_creator::simple(dest, m_hunkbytes) != blockcrc)
throw CHDERR_DECOMPRESSION_ERROR;
return CHDERR_NONE;
case V34_MAP_ENTRY_TYPE_SELF_HUNK:
return read_hunk(blockoffs, dest);
case V34_MAP_ENTRY_TYPE_PARENT_HUNK:
if (m_parent_missing)
throw CHDERR_REQUIRES_PARENT;
return m_parent->read_hunk(blockoffs, dest);
}
break;
// v5 map entries
case 5:
rawmap = m_rawmap + m_mapentrybytes * hunknum;
// uncompressed case
if (!compressed())
{
blockoffs = UINT64(be_read(rawmap, 4)) * UINT64(m_hunkbytes);
if (blockoffs != 0)
file_read(blockoffs, dest, m_hunkbytes);
else if (m_parent_missing)
throw CHDERR_REQUIRES_PARENT;
else if (m_parent != NULL)
m_parent->read_hunk(hunknum, dest);
else
memset(dest, 0, m_hunkbytes);
return CHDERR_NONE;
}
// compressed case
blocklen = be_read(&rawmap[1], 3);
blockoffs = be_read(&rawmap[4], 6);
blockcrc = be_read(&rawmap[10], 2);
switch (rawmap[0])
{
case COMPRESSION_TYPE_0:
case COMPRESSION_TYPE_1:
case COMPRESSION_TYPE_2:
case COMPRESSION_TYPE_3:
file_read(blockoffs, m_compressed, blocklen);
m_decompressor[rawmap[0]]->decompress(m_compressed, blocklen, dest, m_hunkbytes);
if (!m_decompressor[rawmap[0]]->lossy() && dest != NULL && crc16_creator::simple(dest, m_hunkbytes) != blockcrc)
throw CHDERR_DECOMPRESSION_ERROR;
if (m_decompressor[rawmap[0]]->lossy() && crc16_creator::simple(m_compressed, blocklen) != blockcrc)
throw CHDERR_DECOMPRESSION_ERROR;
return CHDERR_NONE;
case COMPRESSION_NONE:
file_read(blockoffs, dest, m_hunkbytes);
if (crc16_creator::simple(dest, m_hunkbytes) != blockcrc)
throw CHDERR_DECOMPRESSION_ERROR;
return CHDERR_NONE;
case COMPRESSION_SELF:
return read_hunk(blockoffs, dest);
case COMPRESSION_PARENT:
if (m_parent_missing)
throw CHDERR_REQUIRES_PARENT;
return m_parent->read_bytes(UINT64(blockoffs) * UINT64(m_parent->unit_bytes()), dest, m_hunkbytes);
}
break;
}
// if we get here, something was wrong
throw CHDERR_READ_ERROR;
}
// just return errors
catch (chd_error &err)
{
return err;
}
}
