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
  
288
  
289
  
290
  
291
  
292
  
293
  
294
  
295
  
296
  
297
  
298
  
299
  
300
  
301
  
302
  
303
  
304
  
305
  
306
  
307
  
308
  
309
  
310
  
311
  
312
  
313
  
314
  
315
  
316
  
317
  
318
  
319
  
320
  
321
  
322
  
323
  
324
  
325
  
326
  
327
  
328
  
329
  
330
  
331
  
332
  
333
  
334
  
335
  
336
  
337
  
338
  
339
  
340
  
341
  
342
  
343
  
344
  
345
  
346
  
347
  
348
  
349
  
350
  
351
  
352
  
353
  
354
  
355
  
356
  
357
  
358
  
359
  
360
  
// Extracts IPTC Information Interchange Model data (aka "IPTC 
// headers") from JPEG files created with PhotoShop. 
//  
// http://www.iptc.org/IIM/ 
// 
// $Id$ 
// 
// Anders Johansson & Henrik Grubbström 
 
mapping(int:mapping(int:string)) fields = 
  ([ 
    1: ([   // ENVELOPE RECORD 
      0:   "model version", 
      5:   "destinatino", 
      20:  "file format", 
      22:  "file format version", 
      30:  "service identifier", 
      40:  "envelope number", 
      50:  "product i.d.", 
      60:  "envelope, priority", 
      70:  "date sent", 
      80:  "time sent", 
      90:  "coded character set", 
      100: "uno", 
      120: "arm Identifier", 
      122: "arm Version", 
    ]), 
    2: ([    // APPLICATION RECORD 
      0:   "record version", 
      3:   "object type reference", 
      4:   "object attribut reference", 
      5:   "object name", 
      7:   "edit status", 
      8:   "editorial update", 
      10:  "urgency", 
      12:  "subject reference", 
      15:  "category", 
      20:  "supplemental category", 
      22:  "fixture identifier", 
      25:  "keywords", 
      26:  "content location code", 
      27:  "content location name", 
      30:  "release date", 
      35:  "release time", 
      37:  "expiration date", 
      38:  "expiration time", 
      40:  "special instructions", 
      42:  "action advised", 
      45:  "reference service", 
      47:  "reference date", 
      50:  "reference number", 
      55:  "date created", 
      60:  "time created", 
      62:  "digital creation date", 
      63:  "digital creation time", 
      65:  "originating program", 
      70:  "program version", 
      75:  "object cycle", 
      80:  "by-line", 
      85:  "by-line title", 
      90:  "city", 
      92:  "sub-location", 
      95:  "province/state", 
      100: "country/primary location code", 
      101: "country/primary location name", 
      103: "original transmission reference", 
      105: "headline", 
      110: "credit", 
      115: "source", 
      116: "copyright notice", 
      118: "contact", 
      120: "caption/abstract", 
      122: "writer/editor", 
      125: "rasterized caption", 
      130: "image type", 
      131: "image orientation", 
      135: "language identifier", 
      150: "audio type", 
      151: "audio sampling rate", 
      152: "audio sampling resolution", 
      153: "audio duration", 
      154: "audio outcue", 
      200: "objectdata preview file format", 
      201: "objectdata preview file format version", 
      202: "objectdata preview data", 
 
      // This one seems to contain a charset name... 
      //   eg "CP_1252" or "CP_2" 
      183: "charset", 
    ]), 
    3: ([ ]), // DIGITAL NEWSPHOTO PARAMETER 
    4: ([ ]), // Not Allocated, 
    5: ([ ]), // Not Allocated, 
    6: ([ ]), // ABSTRACT RELATIONSHIP 
    7: ([     // PRE-OBJECTDATA DESCRIPTOR 
      10: "size mode", 
      20: "max subfile size", 
      90: "objectdata size announced", 
      95: "maximum objectdata size", 
    ]), 
    8: ([     // OBJECTDATA 
      10: "subfile", 
    ]), 
    9: ([     // POST-OBJECTDATA DESCRIPTOR 
      10: "confirmed objectdata size", 
    ]) 
  ]); 
 
mapping(int:multiset(int)) binary_fields = ([ 
  1: (<20, 22>), 
  2: (<0>), 
]); 
 
static int short_value(string str) 
{ 
  return (str[0]<<8)|str[1]; 
  //return (str[1]<<8)|str[0]; 
} 
 
static mapping(string:string|array(string)) decode_photoshop_data(string data) 
{ 
  mapping(string:string|array(string)) res = ([]); 
 
  // 0x0404 is IPTC IIM 
  array blocks = (data / "8BIM\4\4")[1..]; 
  if (!sizeof(blocks)) { 
    werror("No 8BIM/IPTC IIM markers found in data\n"); 
    return res; 
  } 
  //werror("blocks: %O\n", blocks); 
  foreach(blocks, string block) { 
    //werror("block: %O\n", String.string2hex(block)); 
    if (sizeof(block) < 6) { 
      werror("Malformed 8BIM block\n"); 
      continue; 
    } 
 
    string block_type_2; 
    int block_length; 
    string info; 
     
    if (block[0]) { 
      // Photoshop 6.0 format with header description text of variable length. 
      // The two bytes after the description text is zero padding, then comes 
      // the two bytes of data length. 
      int dsclen = block[0]; 
      //werror("dsclen: %d\n", dsclen); 
      block_type_2 = block[1..dsclen]; 
      block_length = short_value(block[dsclen+3..dsclen+4]); 
      info = block[5+dsclen..4+dsclen+block_length]; 
    } 
    else { 
      block_type_2 = block[..3]; 
      //werror("block_type_2: %O\n", block_type_2); 
      block_length = short_value(block[4..5]); 
      info = block[6..5 + block_length]; 
    } 
 
#if 0 
    werror("block_length: %O\n" 
           "actual length: %O\n" 
           "info: %O\n", block_length, sizeof(info), info); 
#endif /* 0 */ 
 
    while (sizeof(info)) { 
      if (sizeof(info) < 6) { 
        //werror("Short info %O\n", info); 
        break; 
      } 
      int segment_marker = info[0]; 
      int record_set = info[1]; 
      int id = info[2]; 
      int size = short_value(info[3..4]); 
      string data = info[5..size+5-1]; 
      info = info[size+5..]; 
 
      if (segment_marker != '\x1c') { 
        if (segment_marker == '\x6f') { 
          // I have not found any documentation for this segment, 
          // but I use it to detect Nyhedstjeneste. 
          if ((record_set == 110) && (!id)) { 
            res->charset = ({ "iso-8859-1" }); 
            continue; 
          } 
        } 
#if 1 
      werror("Unknown segment marker: 0x%02x\n" 
               "record_set: %d\n" 
               "id: %d\n" 
               "data: %O\n", segment_marker, record_set, id, data); 
#endif /* 1 */ 
      break; 
      } 
 
      if (!has_value(indices(fields), record_set)) { 
        werror("Unknown record set marker: %O\n", record_set); 
        break; 
      } 
 
      //werror("%3d: ", id); 
      //werror("%O\n", data); 
      //werror("info: %O\n", String.string2hex(info)); 
      string label = 
        fields[record_set][id] || 
        (string)record_set + ":" + (string)id; 
 
      if (label == "coded character set") { 
        if (data == "\e%5") { 
          res->charset = (res->charset || ({})) + ({ "iso-8859-1" }); 
        } 
      } 
 
      if (label == "special instructions" && lower_case(data) == "nyhedstjeneste") 
        res->charset = (res->charset || ({})) + ({ "iso-8859-1" }); 
 
      if ((binary_fields[record_set] && binary_fields[record_set][id]) || 
          (<3, 7>)[record_set]) { 
        // Decode binary fields. 
        data = (string)Gmp.mpz(data, 256); 
      } 
 
      // werror("RAW: %O:%O\n", label, data); 
 
      if (res[label]) 
        res[label] += ({ data }); 
      else 
        res[label] = ({ data }); 
    } 
  } 
  return res; 
} 
 
mapping get_information(Stdio.File fd) 
{ 
  string marker = fd->read(2); 
  string photoshop_data = ""; 
 
  if (marker == "%!") { 
    int bytes = -1; 
    // Note: We use the split iterator by hand to make sure '\r' is 
    //       valid as a line terminator. 
    foreach(String.SplitIterator(marker, (<'\r','\n'>), 1, 
                                 fd->read_function(8192)); 
            int lineno; string line) { 
      if (line[0] != '%') continue; 
      if (bytes < 0) sscanf(line, "%%BeginPhotoshop: %d", bytes); 
      else if (has_prefix(line, "%EndPhotoshop")) { 
        break; 
      } else if (has_prefix(line, "% ")) { 
#if constant(String.hex2string) 
      photoshop_data += String.hex2string(line[2..]); 
#else 
      photoshop_data += Crypto.hex_to_string(line[2..]); 
#endif 
      if (sizeof(photoshop_data) >= bytes) break; 
      } else { 
#if constant(String.hex2string) 
      photoshop_data += String.hex2string(line[1..]); 
#else 
      photoshop_data += Crypto.hex_to_string(line[1..]); 
#endif 
      if (sizeof(photoshop_data) >= bytes) break; 
      } 
    } 
  } else if (marker == "\xff\xd8") { 
    do { 
      string app = fd->read(2); 
      if (sizeof(app) != 2) 
      break; 
      string length_s = fd->read(2); 
      int length; 
      if (sizeof(length_s) == 2) 
        length = short_value(length_s); 
      //werror ("length: %O\n", short_value(length_s)); 
 
      string data = fd->read(length-2); 
      if (app == "\xff\xed") // APP14 Photoshop 
      { 
        //werror("data: %O\n", data); 
        photoshop_data = data; 
        break; 
      } 
    } while (1); 
  } else { 
    //werror("unknown marker: %O neither JPEG nor Postscript\n", marker); 
    return ([]); 
  } 
 
  if (!sizeof(photoshop_data)) return ([]); 
 
  mapping res = decode_photoshop_data(photoshop_data); 
 
  if (sizeof(res)) { 
    // IIMV 4.1 Chapter 3 Section 1.6 (a): 
    //   Record 1:xx shall use coded character set ISO 646 International 
    //   Reference Version or ISO 4873 Default Version. 
    // 
    // IIMV 4.1 Chapter 5 1:90: 
    //   The control functions apply to character oriented DataSets in 
    //   records 2-6. They also apply to record 8, unless the objectdata 
    //   explicitly, or the File Format implicitly, defines character sets 
    //   otherwise. 
    //   [...] 
    //   If 1:90 is omitted, the default for records 2-6 and 8 is ISO 646 
    //   IRV (7 bits) or ISO 4873 DV (8 bits). Record 1 shall always use 
    //   ISO 646 IRV or ISO 4873 DV respectively. 
    // 
    // In practice the above of course isn't true, and it seems 
    // that macintosh encoding is used in place of ISO 4873 DV. 
    // 
    // 1: "iso646irv" or "iso4873dv", 
    // 
    // Most application record fields seem to be encoded 
    // with the macintosh charset. 
    // 
    // This has been verified for the fields: 
    //   "by-line" 
    //   "caption/abstract" 
    //   "city" 
    //   "copyright notice" 
    //   "headline" 
    //   "keywords" 
    //   "object name" 
    //   "source" 
    //   "special instructions" 
    //   "supplemental category" 
    //   "writer/editor" 
    // and is assumed for the remainder. 
    // 
    // Some do however (eg Nyhedstjeneste in Denmark) use ISO-8859-1. 
    // 
    // We attempt some DWIM... 
 
    string charset; 
    if (!res->charset) { 
      charset = "macintosh"; 
    } else { 
      charset = lower_case(res->charset[0]); 
 
      // Remap to standard names: 
      charset = ([ 
        "cp_1252":"windows1252", 
        "cp_2":"macintosh", 
      ])[charset] || charset; 
    } 
    //werror("Charset: %O\n", charset); 
    res->charset = ({ charset }); 
    object decoder = Locale.Charset.decoder(charset); 
    foreach(res; string key; array(string) vals) { 
      res[key] = map(vals, 
                     lambda(string val, object decoder) { 
                       return decoder->feed(val)->drain(); 
                     }, decoder); 
    } 
  } 
 
  return res; 
}