summaryrefslogtreecommitdiffstats
path: root/kernel/kls_xcf/xcf2pnm/xcf-general.c
blob: 92311346dc51be4003051b59fb9085315d1fd5c9 (plain)
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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
/* Generic functions for reading XCF files
 *
 * Copyright (C) 2006  Henning Makholm
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "xcftools.h"
#include <string.h>
#include <errno.h>
#ifdef HAVE_ICONV
# include <iconv.h>
#elif !defined(ICONV_CONST)
# define ICONV_CONST const
#endif

uint8_t *xcf_file = 0 ;
size_t xcf_length ;
int use_utf8 = 0 ;

uint32_t
xcfOffset(uint32_t addr,int spaceafter)
{
  uint32_t apparent ;
  xcfCheckspace(addr,4,"(xcfOffset)");
  apparent = xcfL(addr);
  xcfCheckspace(apparent,spaceafter,
                "Too large offset (%" PRIX32 ") at position %" PRIX32,
                apparent,addr);
  return apparent ;
}

int
xcfNextprop(uint32_t *master,uint32_t *body)
{
  uint32_t ptr, length, total, minlength ;
  PropType type ;
  ptr = *master ;
  xcfCheckspace(ptr,8,"(property header)");
  type = xcfL(ptr);
  length = xcfL(ptr+4);
  *body = ptr+8 ;

  switch(type) {
  case PROP_COLORMAP:
    {
      uint32_t ncolors ;
      xcfCheckspace(ptr+8,4,"(colormap length)");
      ncolors = xcfL(ptr+8) ;
      if( ncolors > 256 )
        FatalBadXCF("Colormap has %" PRIu32 " entries",ncolors);
      /* Surprise! Some older verion of the Gimp computed the wrong length
       * word, and the _reader_ always just reads three bytes per color
       * and ignores the length tag! Duplicate this so we too can read
       * the buggy XCF files.
       */
      length = minlength = 4+3*ncolors;
      break;
    }
  case PROP_COMPRESSION: minlength = 1; break;
  case PROP_OPACITY:     minlength = 4; break;
  case PROP_APPLY_MASK:  minlength = 4; break;
  case PROP_OFFSETS:     minlength = 8; break;
  case PROP_MODE:        minlength = 4; break;
  default:               minlength = 0; break;
  }
  if( length < minlength )
    FatalBadXCF("Short %s property at %" PRIX32 " (%" PRIu32 "<%" PRIu32 ")",
                showPropType(type),ptr,length,minlength);
  *master = ptr+8+length ;
  total = 8 + length + (type != PROP_END ? 8 : 0) ;
  if( total < length ) /* Check overwrap */
    FatalBadXCF("Overlong property at %" PRIX32, ptr);
  xcfCheckspace(ptr,total,"Overlong property at %" PRIX32,ptr) ;
  return type ;
}

const char*
xcfString(uint32_t ptr,uint32_t *after)
{
  uint32_t length ;
  unsigned i ;
  ICONV_CONST char *utf8master ;
  
  xcfCheckspace(ptr,4,"(string length)");
  length = xcfL(ptr) ;
  ptr += 4 ;
  xcfCheckspace(ptr,length,"(string)");
  utf8master = (ICONV_CONST char*)(xcf_file+ptr) ;
  if( after ) *after = ptr + length ;
  if( length == 0 || utf8master[length-1] != 0 )
    FatalBadXCF("String at %" PRIX32 " not zero-terminated",ptr-4);
  length-- ;

  if( use_utf8 ) return utf8master ;

  /* We assume that the local character set includes ASCII...
   * Check if conversion is needed at all
   */
  for( i=0 ; ; i++ ) {
    if( i == length )
      return utf8master ; /* Only ASCII after all */
    if( utf8master[i] == 0 )
      FatalBadXCF("String at %" PRIX32 " has embedded zeroes",ptr-4);
    if( (int8_t) utf8master[i] < 0 )
      break ;
  }
#ifdef HAVE_ICONV
  {
    size_t targetsize = length+1 ;
    int sloppy_translation = 0 ;
    iconv_t cd = iconv_open("//TRANSLIT","UTF-8");
    if( cd == (iconv_t) -1 ) {
      cd = iconv_open("","UTF-8");
      sloppy_translation = 1 ;
    }
    if( cd == (iconv_t) -1 )
      iconv_close(cd) ; /* Give up; perhaps iconv doesn't know UTF-8 */
    else
      while(1) {
        char *buffer = xcfmalloc(targetsize) ;
        ICONV_CONST char *inbuf = utf8master ;
        char *outbuf = buffer ;
        size_t incount = length ;
        size_t outcount = targetsize ;
        while(1) { /* Loop for systems without //ICONV support */
          size_t result = iconv(cd,&inbuf,&incount,&outbuf,&outcount) ;
          if( result == (size_t)-1 && errno == EILSEQ &&
              sloppy_translation && outcount > 0 ) {
            *outbuf++ = '?' ;
            outcount-- ;
            while( (int8_t)*inbuf < 0 ) inbuf++, incount-- ;
            continue ;
          }
          if( result != (size_t)-1 ) {
            if( outcount == 0 )
              errno = E2BIG ;
            else {
              *outbuf = 0 ;
              iconv_close(cd) ;
              return buffer ;
            }
          }
          break ;
        }
        if( errno == EILSEQ || errno == EINVAL )
          FatalBadXCF("Bad UTF-8 encoding '%s' at %" PRIXPTR,
                      inbuf,(uintptr_t)((inbuf-utf8master)+ptr));
        if( errno == E2BIG ) {
          targetsize += 1+incount ;
          xcffree(buffer) ;
          continue ;
        }
        FatalUnexpected("!iconv on layer name at %"PRIX32,ptr);
      }
  }
#endif
  {
    static int warned = 0 ;
    if( !warned ) {
      fprintf(stderr,_("Warning: one or more layer names could not be\n"
                       "         translated to the local character set.\n"));
      warned = 1 ;
    }
  }
  return utf8master ;
}

/* ****************************************************************** */

void
computeDimensions(struct tileDimensions *d)
{
  d->c.r = d->c.l + d->width ;
  d->c.b = d->c.t + d->height ;
  d->tilesx = (d->width+TILE_WIDTH-1)/TILE_WIDTH ;
  d->tilesy = (d->height+TILE_HEIGHT-1)/TILE_HEIGHT ;
  d->ntiles = d->tilesx * d->tilesy ;
}

struct xcfImage XCF ;

void
getBasicXcfInfo(void)
{
  uint32_t ptr, data, layerfile ;
  PropType type ;
  int i ;
  
  xcfCheckspace(0,14+7*4,"(very short)");
  if( strcmp((char*)xcf_file,"gimp xcf file") == 0 )
    XCF.version = 0 ;
  else if( xcf_file[13] == 0 &&
          sscanf((char*)xcf_file,"gimp xcf v%d",&XCF.version) == 1 )
    ;
  else
    FatalBadXCF(_("Not an XCF file at all (magic not recognized)"));

  if( XCF.version < 0 || XCF.version > 2 ) {
    fprintf(stderr,
            _("Warning: XCF version %d not supported (trying anyway...)\n"),
            XCF.version);
  }
  
  XCF.compression = COMPRESS_NONE ;
  XCF.colormapptr = 0 ;
  
  ptr = 14 ;
  XCF.width    = xcfL(ptr); ptr += 4 ;
  XCF.height   = xcfL(ptr); ptr += 4 ;
  XCF.type     = xcfL(ptr); ptr += 4 ;
  while( (type = xcfNextprop(&ptr,&data)) != PROP_END ) {
    switch(type) {
    case PROP_COLORMAP:
      XCF.colormapptr = data ;
      break ;
    case PROP_COMPRESSION:
      XCF.compression = xcf_file[data] ;
      break ;
    default:
      /* Ignore unknown properties */
      break ;
    }
  }

  layerfile = ptr ;
  for( XCF.numLayers = 0 ; xcfOffset(ptr,8*4) ; XCF.numLayers++, ptr+=4  )
    ;
  XCF.layers = xcfmalloc(XCF.numLayers * sizeof(struct xcfLayer)) ;
  for( i = 0 ; i < XCF.numLayers ; i++ ) {
    struct xcfLayer *L = XCF.layers + i ;
    ptr = xcfL(layerfile+4*(XCF.numLayers-1-i)) ;
    L->mode = GIMP_NORMAL_MODE ;
    L->opacity = 255 ;
    L->isVisible = 1 ;
    L->hasMask = 0 ;
    L->dim.width = xcfL(ptr); ptr+=4 ;
    L->dim.height = xcfL(ptr); ptr+=4 ;
    L->type = xcfL(ptr); ptr+=4 ;
    L->name = xcfString(ptr,&ptr);
    L->propptr = ptr ;
    while( (type = xcfNextprop(&ptr,&data)) != PROP_END ) {
      switch(type) {
      case PROP_OPACITY:
        L->opacity = xcfL(data);
        if( L->opacity > 255 )
          L->opacity = 255 ;
        break ;
      case PROP_VISIBLE:
        L->isVisible = xcfL(data) != 0 ;
        break ;
      case PROP_APPLY_MASK:
        L->hasMask = xcfL(data) != 0 ;
        break ;
      case PROP_OFFSETS:
        L->dim.c.l = (int32_t)(xcfL(data  )) ;
        L->dim.c.t = (int32_t)(xcfL(data+4)) ;
        break ;
      case PROP_MODE:
        L->mode = xcfL(data);
        break ;
      default:
        /* Ignore unknown properties */
        break ;
      }
    }
    xcfCheckspace(ptr,8,"(end of layer %s)",L->name);
    L->pixels.tileptrs = 0 ;
    L->pixels.hierarchy = xcfOffset(ptr  ,4*4);
    L->mask.tileptrs = 0 ;
    L->mask.hierarchy   = xcfOffset(ptr+4,4*4);

    computeDimensions(&L->dim);
  }
}