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/* pbmtoescp2.c - read a portable bitmap and produce Epson ESC/P2 raster
** graphics output data for Epson Stylus printers
**
** Copyright (C) 2003 by Ulrich Walcher (u.walcher@gmx.de)
** and Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
/* I used the Epson ESC/P Reference Manual (1997) in writing this. */
#include <string.h>
#include "pbm.h"
#include "shhopt.h"
static char const esc = 033;
struct cmdlineInfo {
const char * inputFileName;
unsigned int resolution;
unsigned int compress;
};
static void
parseCommandLine(int argc, char ** argv,
struct cmdlineInfo *cmdlineP) {
optStruct3 opt;
unsigned int option_def_index = 0;
optEntry *option_def = malloc(100*sizeof(optEntry));
unsigned int compressSpec, resolutionSpec;
opt.opt_table = option_def;
opt.short_allowed = FALSE;
opt.allowNegNum = FALSE;
OPTENT3(0, "compress", OPT_UINT, &cmdlineP->compress,
&compressSpec, 0);
OPTENT3(0, "resolution", OPT_UINT, &cmdlineP->resolution,
&resolutionSpec, 0);
optParseOptions3(&argc, argv, opt, sizeof(opt), 0);
if (argc-1 > 1)
pm_error("Too many arguments: %d. "
"Only argument is the filename", argc-1);
if (compressSpec) {
if (cmdlineP->compress != 0 && cmdlineP->compress != 1)
pm_error("Invalid -compress value: %u. Only 0 and 1 are valid.",
cmdlineP->compress);
} else
cmdlineP->compress = 1;
if (resolutionSpec) {
if (cmdlineP->resolution != 360 && cmdlineP->resolution != 180)
pm_error("Invalid -resolution value: %u. "
"Only 180 and 360 are valid.", cmdlineP->resolution);
} else
cmdlineP->resolution = 360;
if (argc-1 == 1)
cmdlineP->inputFileName = argv[1];
else
cmdlineP->inputFileName = "-";
}
static unsigned int
enc_epson_rle(unsigned int const l,
const unsigned char * const src,
unsigned char * const dest) {
/*----------------------------------------------------------------------------
compress l data bytes from src to dest and return the compressed
length
-----------------------------------------------------------------------------*/
unsigned int i; /* index */
unsigned int state; /* run state */
unsigned int pos; /* source position */
unsigned int dpos; /* destination position */
pos = dpos = state = 0;
while ( pos < l )
{
for (i=0; i<128 && pos+i<l; i++)
/* search for begin of a run, smallest useful run is 3
equal bytes
*/
if(src[pos+i]==src[pos+i+1] && src[pos+i]==src[pos+i+2])
{
state=1; /* set run state */
break;
}
if(i)
{
/* set counter byte for copy through */
dest[dpos] = i-1;
/* copy data bytes before run begin or end cond. */
memcpy(dest+dpos+1,src+pos,i);
pos+=i; dpos+=i+1; /* update positions */
}
if (state)
{
for (i=0; src[pos+i]==src[pos+i+1] && i<128 && pos+i<l; i++);
/* found the runlength i */
dest[dpos] = 257-i; /* set counter for byte repetition */
dest[dpos+1] = src[pos]; /* set byte to be repeated */
pos+=i; dpos+=2; state=0; /* update positions, reset run state */
}
}
return dpos;
}
int
main(int argc, char* argv[]) {
FILE* ifP;
int rows, cols;
int format;
unsigned int row, idx, len;
unsigned int h, v;
unsigned char *bytes, *cprbytes;
struct cmdlineInfo cmdline;
pbm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileName);
pbm_readpbminit(ifP, &cols, &rows, &format);
bytes = malloc(24*pbm_packed_bytes(cols)+2);
cprbytes = malloc(2*24*pbm_packed_bytes(cols));
if (bytes == NULL || cprbytes == NULL)
pm_error("Cannot allocate memory");
h = v = 3600/cmdline.resolution;
/* Set raster graphic mode. */
printf("%c%c%c%c%c%c", esc, '(', 'G', 1, 0, 1);
/* Set line spacing in units of 1/360 inches. */
printf("%c%c%c", esc, '+', 24*h/10);
/* Write out raster stripes 24 rows high. */
for (row = 0; row < rows; row += 24) {
unsigned int const linesThisStripe = (rows-row<24) ? rows%24 : 24;
printf("%c%c%c%c%c%c%c%c", esc, '.', cmdline.compress,
v, h, linesThisStripe,
cols%256, cols/256);
/* Read pbm rows, each padded to full byte */
for (idx = 0; idx < 24 && row+idx < rows; ++idx)
pbm_readpbmrow_packed(ifP,bytes+idx*pbm_packed_bytes(cols),
cols,format);
/* Write raster data. */
if (cmdline.compress != 0) {
/* compressed */
len = enc_epson_rle(linesThisStripe * pbm_packed_bytes(cols),
bytes, cprbytes);
fwrite(cprbytes,len,1,stdout);
} else
/* uncompressed */
fwrite(bytes, pbm_packed_bytes(cols), linesThisStripe, stdout);
if (rows-row >= 24) putchar('\n');
}
free(bytes); free(cprbytes);
pm_close(ifP);
/* Reset printer. */
printf("%c%c", esc, '@');
return 0;
}
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