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#include <string.h>
#include "mallocvar.h"
#include "pm.h"
#include "global_variables.h"
#include "util.h"
#include "decode.h"
#include "bayer.h"
#include "canon.h"
#include "stdio_nofail.h"
void
canon_600_load_raw(Image const image) {
unsigned char data[1120], *dp;
unsigned short pixel[896], *pix;
int irow, orow, col;
for (irow=orow=0; irow < height; irow++)
{
fread_nofail (data, 1120, 1, ifp);
for (dp=data, pix=pixel; dp < data+1120; dp+=10, pix+=8)
{
pix[0] = (dp[0] << 2) + (dp[1] >> 6 );
pix[1] = (dp[2] << 2) + (dp[1] >> 4 & 3);
pix[2] = (dp[3] << 2) + (dp[1] >> 2 & 3);
pix[3] = (dp[4] << 2) + (dp[1] & 3);
pix[4] = (dp[5] << 2) + (dp[9] & 3);
pix[5] = (dp[6] << 2) + (dp[9] >> 2 & 3);
pix[6] = (dp[7] << 2) + (dp[9] >> 4 & 3);
pix[7] = (dp[8] << 2) + (dp[9] >> 6 );
}
for (col=0; col < width; col++)
BAYER(orow,col) = pixel[col];
for (col=width; col < 896; col++)
black += pixel[col];
if ((orow+=2) > height)
orow = 1;
}
black /= (896 - width) * height;
maximum = 0x3ff;
}
void
canon_a5_load_raw(Image const image) {
unsigned char data[1940], *dp;
unsigned short pixel[1552], *pix;
int row, col;
for (row=0; row < height; row++) {
fread_nofail (data, raw_width * 10 / 8, 1, ifp);
for (dp=data, pix=pixel; pix < pixel+raw_width; dp+=10, pix+=8)
{
pix[0] = (dp[1] << 2) + (dp[0] >> 6);
pix[1] = (dp[0] << 4) + (dp[3] >> 4);
pix[2] = (dp[3] << 6) + (dp[2] >> 2);
pix[3] = (dp[2] << 8) + (dp[5] );
pix[4] = (dp[4] << 2) + (dp[7] >> 6);
pix[5] = (dp[7] << 4) + (dp[6] >> 4);
pix[6] = (dp[6] << 6) + (dp[9] >> 2);
pix[7] = (dp[9] << 8) + (dp[8] );
}
for (col=0; col < width; col++)
BAYER(row,col) = (pixel[col] & 0x3ff);
for (col=width; col < raw_width; col++)
black += pixel[col] & 0x3ff;
}
if (raw_width > width)
black /= (raw_width - width) * height;
maximum = 0x3ff;
}
/*
Return 0 if the image starts with compressed data,
1 if it starts with uncompressed low-order bits.
In Canon compressed data, 0xff is always followed by 0x00.
*/
static int
canon_has_lowbits()
{
unsigned char test[0x4000];
int ret=1, i;
fseek_nofail (ifp, 0, SEEK_SET);
fread_nofail (test, 1, sizeof test, ifp);
for (i=540; i < sizeof test - 1; i++)
if (test[i] == 0xff) {
if (test[i+1]) return 1;
ret=0;
}
return ret;
}
void
canon_compressed_load_raw(Image const image) {
unsigned short *pixel, *prow;
int lowbits, i, row, r, col, save, val;
unsigned irow, icol;
struct decode *decode, *dindex;
int block, diffbuf[64], leaf, len, diff, carry=0, pnum=0, base[2];
unsigned char c;
MALLOCARRAY(pixel, raw_width*8);
if (pixel == NULL)
pm_error("Unable to allocate space for %u pixels", raw_width*8);
lowbits = canon_has_lowbits();
if (!lowbits) maximum = 0x3ff;
fseek_nofail (ifp, 540 + lowbits*raw_height*raw_width/4, SEEK_SET);
zero_after_ff = 1;
getbits(ifp, -1);
for (row = 0; row < raw_height; row += 8) {
for (block=0; block < raw_width >> 3; block++) {
memset (diffbuf, 0, sizeof diffbuf);
decode = first_decode;
for (i=0; i < 64; i++ ) {
for (dindex=decode; dindex->branch[0]; )
dindex = dindex->branch[getbits(ifp, 1)];
leaf = dindex->leaf;
decode = second_decode;
if (leaf == 0 && i) break;
if (leaf == 0xff) continue;
i += leaf >> 4;
len = leaf & 15;
if (len == 0) continue;
diff = getbits(ifp, 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 (pnum++ % raw_width == 0)
base[0] = base[1] = 512;
pixel[(block << 6) + i] = ( base[i & 1] += diffbuf[i] );
}
}
if (lowbits) {
save = ftell_nofail(ifp);
fseek_nofail (ifp, 26 + row*raw_width/4, SEEK_SET);
for (prow=pixel, i=0; i < raw_width*2; i++) {
c = fgetc_nofail(ifp);
for (r=0; r < 8; r+=2, prow++) {
val = (*prow << 2) + ((c >> r) & 3);
if (raw_width == 2672 && val < 512) val += 2;
*prow = val;
}
}
fseek_nofail (ifp, save, SEEK_SET);
}
for (r=0; r < 8; r++) {
irow = row - top_margin + r;
if (irow >= height) continue;
for (col = 0; col < raw_width; col++) {
icol = col - left_margin;
if (icol < width)
BAYER(irow,icol) = pixel[r*raw_width+col];
else
black += pixel[r*raw_width+col];
}
}
}
free (pixel);
if (raw_width > width)
black /= (raw_width - width) * height;
}
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