CRC / Thumbnail cache naming method?
#1
I need to examine the cache of fanart/posters/etc for my helper app. I see from the code that XBMC calculates the CRC of the file name and uses the first hex digit as a hash. However, I'm not calculating the same result that XBMC does.

For example, this fanart has a name of 9b8e09d3.jpg in the cache, but I calculated a different CRC-32 for the filename. I tried both the original url and the url converted to all lower case.

Is there a special convention to use when calculating the CRC-32? e.g. Removing the http:// or appending the name of the movie.
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#2
it's calculated from a lower-cased url, https://github.com/xbmc/xbmc/blob/master...e.cpp#L252

likely your CRC-32 is slightly different. in particular the version in kodi starts out at 0xFFFFFFFF
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#3
Thanks for the pointer. I re-implemented the algorithm from /xbmc/utils/Crc32.cpp rather than use the built in CRC in my tools library. Looks like there are lots of CRC algorithms and the one I was using didn't match the one from XBMC.
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#4
Since I'm just learning Python, and have little experience with the whole byte deal this was a bite of an adventure. Anyway here is a conversion to C# that seems to be working.

Code:
using System;
using System.Collections.Generic;
using System.Text;

namespace KodiTools {
   public static class Tools {

      public static string GetKodiThumbnailFileName(string photoUri) {
         photoUri = photoUri.ToLower();
         string ext = photoUri.Substring(photoUri.LastIndexOf('.') + 1);
         List<string> allowedExt = new List<string>() { "jpg", "jpeg", "gif", "png" };
         if(!allowedExt.Contains(ext)) {
            return null;
         }

         byte[] buffer = Encoding.UTF8.GetBytes(photoUri);
         uint crc = 0xffffffff;
  
         for(int i = 0; i < buffer.Length; i++) {
            crc = (crc << 8) ^ CrcTable[((crc >> 24) ^ buffer[i]) & 0xff];
         }
         return string.Format("{0}.{1}",
               string.Format("{0:X8}", crc),
               ext
            );
      }

      private static uint[] CrcTable = {
         0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9,
         0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005,
         0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61,
         0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD,
         0x4C11DB70, 0x48D0C6C7, 0x4593E01E, 0x4152FDA9,
         0x5F15ADAC, 0x5BD4B01B, 0x569796C2, 0x52568B75,
         0x6A1936C8, 0x6ED82B7F, 0x639B0DA6, 0x675A1011,
         0x791D4014, 0x7DDC5DA3, 0x709F7B7A, 0x745E66CD,
         0x9823B6E0, 0x9CE2AB57, 0x91A18D8E, 0x95609039,
         0x8B27C03C, 0x8FE6DD8B, 0x82A5FB52, 0x8664E6E5,
         0xBE2B5B58, 0xBAEA46EF, 0xB7A96036, 0xB3687D81,
         0xAD2F2D84, 0xA9EE3033, 0xA4AD16EA, 0xA06C0B5D,
         0xD4326D90, 0xD0F37027, 0xDDB056FE, 0xD9714B49,
         0xC7361B4C, 0xC3F706FB, 0xCEB42022, 0xCA753D95,
         0xF23A8028, 0xF6FB9D9F, 0xFBB8BB46, 0xFF79A6F1,
         0xE13EF6F4, 0xE5FFEB43, 0xE8BCCD9A, 0xEC7DD02D,
         0x34867077, 0x30476DC0, 0x3D044B19, 0x39C556AE,
         0x278206AB, 0x23431B1C, 0x2E003DC5, 0x2AC12072,
         0x128E9DCF, 0x164F8078, 0x1B0CA6A1, 0x1FCDBB16,
         0x018AEB13, 0x054BF6A4, 0x0808D07D, 0x0CC9CDCA,
         0x7897AB07, 0x7C56B6B0, 0x71159069, 0x75D48DDE,
         0x6B93DDDB, 0x6F52C06C, 0x6211E6B5, 0x66D0FB02,
         0x5E9F46BF, 0x5A5E5B08, 0x571D7DD1, 0x53DC6066,
         0x4D9B3063, 0x495A2DD4, 0x44190B0D, 0x40D816BA,
         0xACA5C697, 0xA864DB20, 0xA527FDF9, 0xA1E6E04E,
         0xBFA1B04B, 0xBB60ADFC, 0xB6238B25, 0xB2E29692,
         0x8AAD2B2F, 0x8E6C3698, 0x832F1041, 0x87EE0DF6,
         0x99A95DF3, 0x9D684044, 0x902B669D, 0x94EA7B2A,
         0xE0B41DE7, 0xE4750050, 0xE9362689, 0xEDF73B3E,
         0xF3B06B3B, 0xF771768C, 0xFA325055, 0xFEF34DE2,
         0xC6BCF05F, 0xC27DEDE8, 0xCF3ECB31, 0xCBFFD686,
         0xD5B88683, 0xD1799B34, 0xDC3ABDED, 0xD8FBA05A,
         0x690CE0EE, 0x6DCDFD59, 0x608EDB80,  0x644FC637,
         0x7A089632, 0x7EC98B85, 0x738AAD5C, 0x774BB0EB,
         0x4F040D56, 0x4BC510E1, 0x46863638, 0x42472B8F,
         0x5C007B8A, 0x58C1663D, 0x558240E4, 0x51435D53,
         0x251D3B9E, 0x21DC2629, 0x2C9F00F0, 0x285E1D47,
         0x36194D42, 0x32D850F5, 0x3F9B762C, 0x3B5A6B9B,
         0x0315D626, 0x07D4CB91, 0x0A97ED48, 0x0E56F0FF,
         0x1011A0FA, 0x14D0BD4D, 0x19939B94, 0x1D528623,
         0xF12F560E, 0xF5EE4BB9, 0xF8AD6D60, 0xFC6C70D7,
         0xE22B20D2, 0xE6EA3D65, 0xEBA91BBC, 0xEF68060B,
         0xD727BBB6, 0xD3E6A601, 0xDEA580D8, 0xDA649D6F,
         0xC423CD6A, 0xC0E2D0DD, 0xCDA1F604, 0xC960EBB3,
         0xBD3E8D7E, 0xB9FF90C9, 0xB4BCB610, 0xB07DABA7,
         0xAE3AFBA2, 0xAAFBE615, 0xA7B8C0CC, 0xA379DD7B,
         0x9B3660C6, 0x9FF77D71, 0x92B45BA8, 0x9675461F,
         0x8832161A, 0x8CF30BAD, 0x81B02D74, 0x857130C3,
         0x5D8A9099, 0x594B8D2E, 0x5408ABF7, 0x50C9B640,
         0x4E8EE645, 0x4A4FFBF2, 0x470CDD2B, 0x43CDC09C,
         0x7B827D21, 0x7F436096, 0x7200464F, 0x76C15BF8,
         0x68860BFD, 0x6C47164A, 0x61043093, 0x65C52D24,
         0x119B4BE9, 0x155A565E, 0x18197087, 0x1CD86D30,
         0x029F3D35, 0x065E2082, 0x0B1D065B, 0x0FDC1BEC,
         0x3793A651, 0x3352BBE6, 0x3E119D3F, 0x3AD08088,
         0x2497D08D, 0x2056CD3A, 0x2D15EBE3, 0x29D4F654,
         0xC5A92679, 0xC1683BCE, 0xCC2B1D17, 0xC8EA00A0,
         0xD6AD50A5, 0xD26C4D12, 0xDF2F6BCB, 0xDBEE767C,
         0xE3A1CBC1, 0xE760D676, 0xEA23F0AF, 0xEEE2ED18,
         0xF0A5BD1D, 0xF464A0AA, 0xF9278673, 0xFDE69BC4,
         0x89B8FD09, 0x8D79E0BE, 0x803AC667, 0x84FBDBD0,
         0x9ABC8BD5, 0x9E7D9662, 0x933EB0BB, 0x97FFAD0C,
         0xAFB010B1, 0xAB710D06, 0xA6322BDF, 0xA2F33668,
         0xBCB4666D, 0xB8757BDA, 0xB5365D03, 0xB1F740B4
      };
   }
}

Example:

stirng photoUri = "http://image.tmdb.org/t/p/original/o4qXZMrZlfuTfwwNGMyTcx6p2uO.jpg";
string hexResult = Tools.GetKodiThumbnailFileName(photoUri);

Result will be: 00d41645.jpg

Hope this can save somebody some time.
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CRC / Thumbnail cache naming method?0