/*
* libopenraw - crwdecompressor.h
*
* Copyright (C) 2007-2016 Hubert Figuiere
*
* This library 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 library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
/*
Simple reference decompresser for Canon digital cameras.
Outputs raw 16-bit CCD data, no header, native byte order.
Written by Dave Coffin.
Downloaded from http://cybercom.net/~dcoffin/dcraw/decompress.c
$Revision: 1.1 $
$Date: 2005/06/27 14:07:24 $
*/
#include <fcntl.h>
#include <string.h>
#include <libopenraw/consts.h>
#include <libopenraw/debug.h>
#include "rawdata.hpp"
#include "crwdecompressor.hpp"
#include "exception.hpp"
#include "trace.hpp"
#include "io/stream.hpp"
namespace OpenRaw { namespace Internals {
CrwDecompressor::CrwDecompressor(IO::Stream * stream,
RawContainer * container)
: Decompressor(stream, container),
m_table(0),
m_height(0), m_width(0),
m_free(0), m_leaf(0),
m_bitbuf(0), m_vbits(0)
{
}
CrwDecompressor::~CrwDecompressor()
{
}
/*
A rough description of Canon's compression algorithm:
+ Each pixel outputs a 10-bit sample, from 0 to 1023.
+ Split the data into blocks of 64 samples each.
+ Subtract from each sample the value of the sample two positions
to the left, which has the same color filter. From the two
leftmost samples in each row, subtract 512.
+ For each nonzero sample, make a token consisting of two four-bit
numbers. The low nibble is the number of bits required to
represent the sample, and the high nibble is the number of
zero samples preceding this sample.
+ Output this token as a variable-length bitstring using
one of three tablesets. Follow it with a fixed-length
bitstring containing the sample.
The "first_decode" table is used for the first sample in each
block, and the "second_decode" table is used for the others.
*/
/*
Construct a decode tree according the specification in *source.
The first 16 bytes specify how many codes should be 1-bit, 2-bit
3-bit, etc. Bytes after that are the leaf values.
For example, if the source is
{ 0,1,4,2,3,1,2,0,0,0,0,0,0,0,0,0,
0x04,0x03,0x05,0x06,0x02,0x07,0x01,0x08,0x09,0x00,0x0a,0x0b,0xff },
then the code is
00 0x04
010 0x03
011 0x05
100 0x06
101 0x02
1100 0x07
1101 0x01
11100 0x08
11101 0x09
11110 0x00
111110 0x0a
1111110 0x0b
1111111 0xff
*/
void CrwDecompressor::make_decoder(decode_t *dest, const uint8_t *source,
int level)
{
int i, next;
if (level==0) {
m_free = dest;
m_leaf = 0;
}
m_free++;
/*
At what level should the next leaf appear?
*/
for (i=next=0; i <= m_leaf && next < 16; ) {
i += source[next++];
}
if (i > m_leaf) {
if (level < next) { /* Are we there yet? */
dest->branch[0] = m_free;
make_decoder(m_free,source,level+1);
dest->branch[1] = m_free;
make_decoder(m_free,source,level+1);
}
else {
dest->leaf = source[16 + m_leaf++];
}
}
}
void CrwDecompressor::init_tables(uint32_t table_idx)
{
static const uint8_t first_tree[3][29] = {
{ 0,1,4,2,3,1,2,0,0,0,0,0,0,0,0,0,
0x04,0x03,0x05,0x06,0x02,0x07,0x01,0x08,0x09,0x00,0x0a,0x0b,0xff },
{ 0,2,2,3,1,1,1,1,2,0,0,0,0,0,0,0,
0x03,0x02,0x04,0x01,0x05,0x00,0x06,0x07,0x09,0x08,0x0a,0x0b,0xff },
{ 0,0,6,3,1,1,2,0,0,0,0,0,0,0,0,0,
0x06,0x05,0x07,0x04,0x08,0x03,0x09,0x02,0x00,0x0a,0x01,0x0b,0xff },
};
static const uint8_t second_tree[3][180] = {
{ 0,2,2,2,1,4,2,1,2,5,1,1,0,0,0,139,
0x03,0x04,0x02,0x05,0x01,0x06,0x07,0x08,
0x12,0x13,0x11,0x14,0x09,0x15,0x22,0x00,0x21,0x16,0x0a,0xf0,
0x23,0x17,0x24,0x31,0x32,0x18,0x19,0x33,0x25,0x41,0x34,0x42,
0x35,0x51,0x36,0x37,0x38,0x29,0x79,0x26,0x1a,0x39,0x56,0x57,
0x28,0x27,0x52,0x55,0x58,0x43,0x76,0x59,0x77,0x54,0x61,0xf9,
0x71,0x78,0x75,0x96,0x97,0x49,0xb7,0x53,0xd7,0x74,0xb6,0x98,
0x47,0x48,0x95,0x69,0x99,0x91,0xfa,0xb8,0x68,0xb5,0xb9,0xd6,
0xf7,0xd8,0x67,0x46,0x45,0x94,0x89,0xf8,0x81,0xd5,0xf6,0xb4,
0x88,0xb1,0x2a,0x44,0x72,0xd9,0x87,0x66,0xd4,0xf5,0x3a,0xa7,
0x73,0xa9,0xa8,0x86,0x62,0xc7,0x65,0xc8,0xc9,0xa1,0xf4,0xd1,
0xe9,0x5a,0x92,0x85,0xa6,0xe7,0x93,0xe8,0xc1,0xc6,0x7a,0x64,
0xe1,0x4a,0x6a,0xe6,0xb3,0xf1,0xd3,0xa5,0x8a,0xb2,0x9a,0xba,
0x84,0xa4,0x63,0xe5,0xc5,0xf3,0xd2,0xc4,0x82,0xaa,0xda,0xe4,
0xf2,0xca,0x83,0xa3,0xa2,0xc3,0xea,0xc2,0xe2,0xe3,0xff,0xff },
{ 0,2,2,1,4,1,4,1,3,3,1,0,0,0,0,140,
0x02,0x03,0x01,0x04,0x05,0x12,0x11,0x06,
0x13,0x07,0x08,0x14,0x22,0x09,0x21,0x00,0x23,0x15,0x31,0x32,
0x0a,0x16,0xf0,0x24,0x33,0x41,0x42,0x19,0x17,0x25,0x18,0x51,
0x34,0x43,0x52,0x29,0x35,0x61,0x39,0x71,0x62,0x36,0x53,0x26,
0x38,0x1a,0x37,0x81,0x27,0x91,0x79,0x55,0x45,0x28,0x72,0x59,
0xa1,0xb1,0x44,0x69,0x54,0x58,0xd1,0xfa,0x57,0xe1,0xf1,0xb9,
0x49,0x47,0x63,0x6a,0xf9,0x56,0x46,0xa8,0x2a,0x4a,0x78,0x99,
0x3a,0x75,0x74,0x86,0x65,0xc1,0x76,0xb6,0x96,0xd6,0x89,0x85,
0xc9,0xf5,0x95,0xb4,0xc7,0xf7,0x8a,0x97,0xb8,0x73,0xb7,0xd8,
0xd9,0x87,0xa7,0x7a,0x48,0x82,0x84,0xea,0xf4,0xa6,0xc5,0x5a,
0x94,0xa4,0xc6,0x92,0xc3,0x68,0xb5,0xc8,0xe4,0xe5,0xe6,0xe9,
0xa2,0xa3,0xe3,0xc2,0x66,0x67,0x93,0xaa,0xd4,0xd5,0xe7,0xf8,
0x88,0x9a,0xd7,0x77,0xc4,0x64,0xe2,0x98,0xa5,0xca,0xda,0xe8,
0xf3,0xf6,0xa9,0xb2,0xb3,0xf2,0xd2,0x83,0xba,0xd3,0xff,0xff },
{ 0,0,6,2,1,3,3,2,5,1,2,2,8,10,0,117,
0x04,0x05,0x03,0x06,0x02,0x07,0x01,0x08,
0x09,0x12,0x13,0x14,0x11,0x15,0x0a,0x16,0x17,0xf0,0x00,0x22,
0x21,0x18,0x23,0x19,0x24,0x32,0x31,0x25,0x33,0x38,0x37,0x34,
0x35,0x36,0x39,0x79,0x57,0x58,0x59,0x28,0x56,0x78,0x27,0x41,
0x29,0x77,0x26,0x42,0x76,0x99,0x1a,0x55,0x98,0x97,0xf9,0x48,
0x54,0x96,0x89,0x47,0xb7,0x49,0xfa,0x75,0x68,0xb6,0x67,0x69,
0xb9,0xb8,0xd8,0x52,0xd7,0x88,0xb5,0x74,0x51,0x46,0xd9,0xf8,
0x3a,0xd6,0x87,0x45,0x7a,0x95,0xd5,0xf6,0x86,0xb4,0xa9,0x94,
0x53,0x2a,0xa8,0x43,0xf5,0xf7,0xd4,0x66,0xa7,0x5a,0x44,0x8a,
0xc9,0xe8,0xc8,0xe7,0x9a,0x6a,0x73,0x4a,0x61,0xc7,0xf4,0xc6,
0x65,0xe9,0x72,0xe6,0x71,0x91,0x93,0xa6,0xda,0x92,0x85,0x62,
0xf3,0xc5,0xb2,0xa4,0x84,0xba,0x64,0xa5,0xb3,0xd2,0x81,0xe5,
0xd3,0xaa,0xc4,0xca,0xf2,0xb1,0xe4,0xd1,0x83,0x63,0xea,0xc3,
0xe2,0x82,0xf1,0xa3,0xc2,0xa1,0xc1,0xe3,0xa2,0xe1,0xff,0xff }
};
if (table_idx > 2)
table_idx = 2;
memset( m_first_decode, 0, sizeof(m_first_decode));
memset(m_second_decode, 0, sizeof(m_second_decode));
make_decoder(m_first_decode, first_tree[table_idx], 0);
make_decoder(m_second_decode, second_tree[table_idx], 0);
}
/*
getbits(-1) initializes the buffer
getbits(n) where 0 <= n <= 25 returns an n-bit integer
*/
uint32_t CrwDecompressor::getbits(IO::Stream * s, int nbits)
{
uint32_t ret = 0;
uint8_t c;
if (nbits == 0)
return 0;
if (nbits == -1)
ret = m_bitbuf = m_vbits = 0;
else {
ret = m_bitbuf << (32 - m_vbits) >> (32 - nbits);
m_vbits -= nbits;
}
while (m_vbits < 25) {
try {
c = s->readByte();
m_bitbuf = (m_bitbuf << 8) + c;
if (c == 0xff)
s->readByte(); /* always extra 00 after ff */
m_vbits += 8;
}
catch(const Internals::IOException &)
{
break;
}
}
return ret;
}
namespace {
static
int canon_has_lowbits(IO::Stream * s)
{
uint8_t test[0x4000 - 26];
int ret=1;
uint32_t i;
s->seek (0, SEEK_SET);
s->read (test, sizeof(test));
for (i=514; i < sizeof(test) - 1; i++)
if (test[i] == 0xff) {
if (test[i+1])
return 1;
ret=0;
}
return ret;
}
}
// int oldmain(int argc, char **argv)
RawDataPtr CrwDecompressor::decompress()
{
decode_t *decode, *dindex;
int i, j, leaf, len, diff, diffbuf[64], r, save;
int carry = 0, base[2] = {0, 0};
uint32_t column = 0;
uint16_t outbuf[64];
uint8_t c;
RawDataPtr bitmap(new RawData);
bitmap->setDataType(OR_DATA_TYPE_RAW);
// we know the 10-bits are hardcoded in the CRW
bitmap->setBpc(10);
bitmap->setWhiteLevel((1 << 10) - 1);
uint8_t *rawbuf = (uint8_t*)bitmap->allocData(m_width
* sizeof(uint16_t)
* m_height);
bitmap->setDimensions(m_width,
m_height);
init_tables(m_table);
int lowbits = canon_has_lowbits(m_stream);
LOGDBG2("lowbits = %d height = %d width = %d\n", lowbits,
m_height, m_width);
m_stream->seek(514 + lowbits * m_height * m_width / 4, SEEK_SET);
getbits(m_stream, -1); /* Prime the bit buffer */
while (column < m_width * m_height) {
memset(diffbuf, 0, sizeof(diffbuf));
decode = m_first_decode;
for (i = 0; i < 64; i++ ) {
for (dindex = decode; dindex->branch[0]; ) {
dindex = dindex->branch[getbits(m_stream, 1)];
}
leaf = dindex->leaf;
decode = m_second_decode;
if (leaf == 0 && i) {
break;
}
if (leaf == 0xff) {
continue;
}
i += leaf >> 4;
len = leaf & 15;
if (len == 0) {
continue;
}
diff = getbits(m_stream, len);
if ((diff & (1 << (len-1))) == 0) {
diff -= (1 << len) - 1;
}
if (i < 64) {
diffbuf[i] = diff;
}
}
diffbuf[0] += carry;
carry = diffbuf[0];
for (i=0; i < 64; i++ ) {
if (column++ % m_width == 0) {
base[0] = base[1] = 512;
}
outbuf[i] = (base[i & 1] += diffbuf[i]);
}
if (lowbits) {
save = m_stream->seek(0, SEEK_CUR);
m_stream->seek((column-64)/4, SEEK_SET);
for (i=j=0; j < 64/4; j++ ) {
c = m_stream->readByte();
for (r = 0; r < 8; r += 2) {
// outbuf is 64, so we must check for it to not
// overflow (read out of bounds)
uint16_t next = i < 63 ? outbuf[i+1] : 0;
outbuf[i] = (next << 2) + ((c >> r) & 3);
i++;
}
}
m_stream->seek(save, SEEK_SET);
}
memcpy(rawbuf, outbuf, 2 * 64);
rawbuf += 2 * 64;
}
return bitmap;
}
} }
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0))
indent-tabs-mode:nil
fill-column:80
End:
*/