about summary refs log tree commit diff
path: root/converter/pbm/pbmtoescp2.c
blob: 8585614a04d0cff4ace29af13cc8e67541c18edd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/* 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 "pm_c_util.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);
    
    pm_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;
}