function mvn_pfp_log_decomp,bdata,ctype
clog_19_8=[ $
0, 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, 34, 36, 38, 40, 42, 44, 46, $
48, 50, 52, 54, 56, 58, 60, 62, $
64, 68, 72, 76, 80, 84, 88, 92, $
96, 100, 104, 108, 112, 116, 120, 124, $
128, 136, 144, 152, 160, 168, 176, 184, $
192, 200, 208, 216, 224, 232, 240, 248, $
256, 272, 288, 304, 320, 336, 352, 368, $
384, 400, 416, 432, 448, 464, 480, 496, $
512, 544, 576, 608, 640, 672, 704, 736, $
768, 800, 832, 864, 896, 928, 960, 992, $
1024, 1088, 1152, 1216, 1280, 1344, 1408, 1472, $
1536, 1600, 1664, 1728, 1792, 1856, 1920, 1984, $
2048, 2176, 2304, 2432, 2560, 2688, 2816, 2944, $
3072, 3200, 3328, 3456, 3584, 3712, 3840, 3968, $
4096, 4352, 4608, 4864, 5120, 5376, 5632, 5888, $
6144, 6400, 6656, 6912, 7168, 7424, 7680, 7936, $
8192, 8704, 9216, 9728, 10240, 10752, 11264, 11776, $
12288, 12800, 13312, 13824, 14336, 14848, 15360, 15872, $
16384, 17408, 18432, 19456, 20480, 21504, 22528, 23552, $
24576, 25600, 26624, 27648, 28672, 29696, 30720, 31744, $
32768, 34816, 36864, 38912, 40960, 43008, 45056, 47104, $
49152, 51200, 53248, 55296, 57344, 59392, 61440, 63488, $
65536, 69632, 73728, 77824, 81920, 86016, 90112, 94208, $
98304, 102400, 106496, 110592, 114688, 118784, 122880, 126976, $
131072, 139264, 147456, 155648, 163840, 172032, 180224, 188416, $
196608, 204800, 212992, 221184, 229376, 237568, 245760, 253952, $
262144, 278528, 294912, 311296, 327680, 344064, 360448, 376832, $
393216, 409600, 425984, 442368, 458752, 475136, 491520, 507904]
clog_12_8=long([0, 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, $
64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98,100,102,104,106,108,110,112,114,116,118,120,122,124,126, $
128,132,136,140,144,148,152,156,160,164,168,172,176,180,184,188,192,196,200,204,208,212,216,220,224,228,232,236,240,244,248,252, $
256,264,272,280,288,296,304,312,320,328,336,344,352,360,368,376,384,392,400,408,416,424,432,440,448,456,464,472,480,488,496,504, $
512,528,544,560,576,592,608,624,640,656,672,688,704,720,736,752,768,784,800,816,832,848,864,880,896,912,928,944,960,976,992,1008, $
1024,1056,1088,1120,1152,1184,1216,1248,1280,1312,1344,1376,1408,1440,1472,1504,1536,1568,1600,1632,1664,1696,1728,1760,1792,1824,1856,1888,1920,1952,1984,2016, $
2048,2112,2176,2240,2304,2368,2432,2496,2560,2624,2688,2752,2816,2880,2944,3008,3072,3136,3200,3264,3328,3392,3456,3520,3584,3648,3712,3776,3840,3904,3968,4032 ])
clog = ctype and 1 ? clog_12_8 : clog_19_8
return, clog[byte(bdata)]
end