7c36f72006-03-01Henrik Grubbström (Grubba) // Extracts IPTC Information Interchange Model data (aka "IPTC // headers") from JPEG files created with PhotoShop. // // http://www.iptc.org/IIM/ //
61c58b2006-03-02Henrik Grubbström (Grubba) // $Id: IIM.pmod,v 1.2 2006/03/02 18:35:42 grubba Exp $
7c36f72006-03-01Henrik Grubbström (Grubba) // // 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",
61c58b2006-03-02Henrik Grubbström (Grubba)  // This one seems to contain a charset name... // eg "CP_1252" or "CP_2" 183: "charset",
7c36f72006-03-01Henrik Grubbström (Grubba)  ]), 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", ]) ]);
61c58b2006-03-02Henrik Grubbström (Grubba) mapping(int:multiset(int)) binary_fields = ([ 1: (<20, 22>), 2: (<0>),
7c36f72006-03-01Henrik Grubbström (Grubba) ]); static int short_value(string str) { return (str[0]<<8)|str[1]; //return (str[1]<<8)|str[0]; } mapping get_information(Stdio.File fd) { mapping res = ([]); string jpeg_marker = fd->read(2); if (jpeg_marker != "\xff\xd8") { //werror("unknown JPEG marker: %O\n", jpeg_marker); return res; }
61c58b2006-03-02Henrik Grubbström (Grubba)  // 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 further down.
7c36f72006-03-01Henrik Grubbström (Grubba)  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)); if (app == "\xff\xed") // APP14 Photoshop { string data = fd->read(length-2); //werror("data: %O\n", data); // 0x0404 is IPTC IIM array blocks = (data / "8BIM\4\4")[1..]; if (!sizeof(blocks)) { werror("No 8BIM/IPTC IIM markers found in data\n"); break; } //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 = block[..3]; //werror("block_type_2: %O\n", block_type_2); int block_length = short_value(block[4..5]); string 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') {
61c58b2006-03-02Henrik Grubbström (Grubba)  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;
7c36f72006-03-01Henrik Grubbström (Grubba)  } if (!has_value(indices(fields), record_set)) { werror("Unknown record set marker: %O\n", record_set);
61c58b2006-03-02Henrik Grubbström (Grubba)  break;
7c36f72006-03-01Henrik Grubbström (Grubba)  } //werror("%3d: ", id);
61c58b2006-03-02Henrik Grubbström (Grubba)  //werror("%O\n", data);
7c36f72006-03-01Henrik Grubbström (Grubba)  //werror("info: %O\n", String.string2hex(info)); string label = fields[record_set][id] || (string)record_set + ":" + (string)id;
61c58b2006-03-02Henrik Grubbström (Grubba)  if (label == "coded character set") { if (data == "\e%5") { res->charset = (res->charset || ({})) + ({ "iso-8859-1" }); }
7c36f72006-03-01Henrik Grubbström (Grubba)  }
61c58b2006-03-02Henrik Grubbström (Grubba)  if ((binary_fields[record_set] && binary_fields[record_set][id]) || (<3, 7>)[record_set]) { // Decode binary fields. data = (string)Gmp.mpz(data, 256);
7c36f72006-03-01Henrik Grubbström (Grubba)  }
61c58b2006-03-02Henrik Grubbström (Grubba)  // werror("RAW: %O:%O\n", label, data);
7c36f72006-03-01Henrik Grubbström (Grubba)  if (res[label]) res[label] += ({ data }); else res[label] = ({ data }); } } break; } fd->read(length-2); } while (1);
61c58b2006-03-02Henrik Grubbström (Grubba)  if (sizeof(res)) { 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); } }
7c36f72006-03-01Henrik Grubbström (Grubba)  return res; }