110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
|
/*
|
||
|
|
* PostScript filter functions
|
||
|
|
*
|
||
|
|
* Copyright 2003 Huw D M Davies
|
||
|
|
*
|
||
|
|
* 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 2.1 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, write to the Free Software
|
||
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
*/
|
||
|
|
#include <ctype.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include "psdrv.h"
|
||
|
|
#include "wine/debug.h"
|
||
|
|
|
||
|
|
WINE_DEFAULT_DEBUG_CHANNEL(psdrv);
|
||
|
|
|
||
|
|
DWORD RLE_encode(BYTE *in_buf, DWORD len, BYTE *out_buf)
|
||
|
|
{
|
||
|
|
BYTE *next_in = in_buf, *next_out = out_buf;
|
||
|
|
DWORD rl;
|
||
|
|
|
||
|
|
while(next_in < in_buf + len) {
|
||
|
|
if(next_in + 1 < in_buf + len) {
|
||
|
|
if(*next_in == *(next_in + 1)) {
|
||
|
|
next_in += 2;
|
||
|
|
rl = 2;
|
||
|
|
while(next_in < in_buf + len && *next_in == *(next_in - 1) && rl < 128) {
|
||
|
|
next_in++;
|
||
|
|
rl++;
|
||
|
|
}
|
||
|
|
*next_out++ = 257 - rl;
|
||
|
|
*next_out++ = *(next_in - 1);
|
||
|
|
} else {
|
||
|
|
rl = 0;
|
||
|
|
next_out++;
|
||
|
|
while(next_in < in_buf + len && rl < 128) {
|
||
|
|
if(next_in + 2 < in_buf + len && *next_in == *(next_in + 1)) {
|
||
|
|
if(rl == 127 || *next_in == *(next_in + 2))
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
*next_out++ = *next_in++;
|
||
|
|
rl++;
|
||
|
|
}
|
||
|
|
*(next_out - rl - 1) = rl - 1;
|
||
|
|
}
|
||
|
|
} else { /* special case: begin of run on last byte */
|
||
|
|
*next_out++ = 0;
|
||
|
|
*next_out++ = *next_in;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
*next_out++ = 128;
|
||
|
|
return next_out - out_buf;
|
||
|
|
}
|
||
|
|
|
||
|
|
DWORD ASCII85_encode(BYTE *in_buf, DWORD len, BYTE *out_buf)
|
||
|
|
{
|
||
|
|
DWORD number;
|
||
|
|
BYTE *next_in = in_buf, *next_out = out_buf;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
while(next_in + 3 < in_buf + len) {
|
||
|
|
number = (next_in[0] << 24) |
|
||
|
|
(next_in[1] << 16) |
|
||
|
|
(next_in[2] << 8) |
|
||
|
|
(next_in[3] );
|
||
|
|
next_in += 4;
|
||
|
|
if(number == 0)
|
||
|
|
*next_out++ = 'z';
|
||
|
|
else {
|
||
|
|
for(i = 4; i >= 0; i--) {
|
||
|
|
next_out[i] = number % 85 + '!';
|
||
|
|
number /= 85;
|
||
|
|
}
|
||
|
|
next_out += 5;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if(next_in != in_buf + len) {
|
||
|
|
number = (*next_in++ << 24) & 0xff000000;
|
||
|
|
if(next_in < in_buf + len)
|
||
|
|
number |= ((*next_in++ << 16) & 0x00ff0000);
|
||
|
|
if(next_in < in_buf + len)
|
||
|
|
number |= ((*next_in++ << 8) & 0x0000ff00);
|
||
|
|
|
||
|
|
for(i = len % 4 + 1; i < 5; i++)
|
||
|
|
number /= 85;
|
||
|
|
|
||
|
|
for(i = len % 4; i >= 0; i--) {
|
||
|
|
next_out[i] = number % 85 + '!';
|
||
|
|
number /= 85;
|
||
|
|
}
|
||
|
|
next_out += len % 4 + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return next_out - out_buf;
|
||
|
|
}
|