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// Extracts IPTC Information Interchange Model data (aka "IPTC 
// headers") from JPEG files created with PhotoShop. 
// 
// Anders Johansson & Henrik Grubbström 
 
#pike __REAL_VERSION__ 
 
//! IPTC Information Interchange Model data 
//! (aka "IPTC header") extraction. 
//! 
//! @url{http://www.iptc.org/IIM/@} 
 
mapping(int:mapping(int:string)) fields = 
  ([ 
    1: ([   // ENVELOPE RECORD 
      0:   "model version", 
      5:   "destination", 
      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",                   // Unique Name of Object. 
      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",                      // Obsoleted by "subject reference". 
      20:  "supplemental category", // Obsoleted by "subject reference". 
      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>), 
]); 
 
protected int short_value(string str) 
{ 
  return (str[0]<<8)|str[1]; 
  //return (str[1]<<8)|str[0]; 
} 
 
protected 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: %x\n", 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 0 
      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: %x\n", info); 
      string label = 
        fields[record_set][id] || 
        (string)record_set + ":" + (string)id; 
 
      if (label == "coded character set") { 
        string charset = ([ 
          "\e%/@": "UTF-16",    // ISO-IR 162 (NB: Actually UCS-2 level 1) 
          "\e%/A": "UTF-32",    // ISO-IR 163 (NB: Actually UCS-4 level 1) 
          "\e%/B": "ISO-8859-1",// ISO-IR 125 (NB: Actually binary) 
          "\e%/C": "UTF-16",    // ISO-IR 174 (NB: Actually UCS-2 level 2) 
          "\e%/D": "UTF-32",    // ISO-IR 175 (NB: Actually UCS-4 level 2) 
          "\e%/E": "UTF-16",    // ISO-IR 176 (NB: Actually UCS-2 level 3) 
          "\e%/F": "UTF-32",    // ISO-IR 177 (NB: Actually UCS-4 level 3) 
          "\e%/G": "UTF-8",     // ISO-IR 190 (NB: Actually UTF-8 level 1) 
          "\e%/H": "UTF-8",     // ISO-IR 191 (NB: Actually UTF-8 level 2) 
          "\e%/I": "UTF-8",     // ISO-IR 192 (NB: Actually UTF-8 level 3) 
          "\e%/J": "UTF-16",    // ISO-IR 193 (NB: Actually UTF-16 level 1) 
          "\e%/K": "UTF-16",    // ISO-IR 194 (NB: Actually UTF-16 level 2) 
          "\e%/L": "UTF-16",    // ISO-IR 195 (NB: Actually UTF-16 level 3) 
          "\e%5": "ISO-8859-1", 
          "\e%@": "ISO-2022",   // ISO-IR 108, ISO-IR 178 
          "\e%A": "NAPLPS",     // ISO-IR 108 
          "\e%B": "UTF-1",      // ISO-IR 178 
          "\e%C": "T.101 DS1",  // ISO-IR 131 
          "\e%D": "T.101 DS2",  // ISO-IR 145 
          "\e%E": "T.101 PHOTO",// ISO-IR 160 
          "\e%F": "T.101 AUDIO",// ISO-IR 161 
          "\e%G": "UTF-8",      // ISO-IR 196 
          "\e%H": "T.107 VEMMI",// ISO-IR 188 
        ])[data]; 
        if (charset) { 
          res->charset = (res->charset || ({})) + ({ charset }); 
        } 
      } 
 
      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; 
} 
 
//! Get IPTC information from an open file. 
//! 
//! Supported embedding formats are: 
//! 
//! @ul 
//!   @item 
//!     PhotoShop Document (aka PSD). 
//!   @item 
//!     Postscript and Embedded Postscript. 
//!   @item 
//!     Joint Picture Experts Group (aka JPEG). 
//! @endul 
//! 
//! @returns 
//!   Returns a mapping containing any found IPTC IIM data. 
mapping get_information(Stdio.File fd) 
{ 
  string marker = fd->read(2); 
  string photoshop_data = ""; 
 
  if (marker == "\xc5\xd0") { 
    // Probably a DOS EPS Binary Header. 
    string tmp = fd->read(28); 
    if (!has_prefix(tmp, "\xd3\xc6")) return ([]); 
    int offset; 
    sscanf(tmp, "%*2c%-4c", offset); 
    offset -= 30; 
    if (offset < 0) return ([]); 
    if (offset > 0) fd->read(offset); 
    marker = fd->read(2);       // Should be a PS header. 
  } 
  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; 
      } 
      // Let hex2string swollow "%" and possible " ". 
      photoshop_data += String.hex2string(line); 
      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); 
      else 
        break; 
      //werror ("length: %O\n", short_value(length_s)); 
 
      string data = fd->read((length-2) & 0xffff); 
      if (app == "\xff\xed") // APP14 Photoshop 
      { 
        //werror("data: %O\n", data); 
        photoshop_data = data; 
        break; 
      } 
    } while (1); 
  } else if (marker == "8B") { 
    //  May be a native PSD file. It should start with "8BPS\0\1" to be valid. 
    string marker2 = fd->read(4); 
    if (marker2 == "PS\0\1") { 
      photoshop_data = "8BPS\0\1" + fd->read(); 
    } 
  } 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", 
        "cp_utf8": "utf8", 
      ])[charset] || charset; 
    } 
    //werror("Charset: %O\n", charset); 
    res->charset = ({ charset }); 
    object decoder = 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; 
}