MPESection: removed new crc calculation, since there was no perfomance benefit.

Packets/MPEGDVBBundle/MPESection.cc

@@ -5,11 +5,6 @@
 // Competence Center NETwork research (NET), St. Augustin, GERMANY
 //     Thorsten Horstmann <tho@berlios.de>
 //
-// and
-//
-// Copyright(C) 2002 Pascal Massimino <skal@planet-d.net>
-// (xvidcore-1.1.0-beta2/examples/xvid_bench.c)
-//
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation; either version 2 of the License, or
@@ -41,87 +36,14 @@
 #define prefix_
 ///////////////////////////////cc.p////////////////////////////////////////
 
-unsigned long senf::MPESectionParser::crc32tab_[256] = {
-        0x00000000L, 0x04C11DB7L, 0x09823B6EL, 0x0D4326D9L, 0x130476DCL,
-        0x17C56B6BL, 0x1A864DB2L, 0x1E475005L, 0x2608EDB8L, 0x22C9F00FL,
-        0x2F8AD6D6L, 0x2B4BCB61L, 0x350C9B64L, 0x31CD86D3L, 0x3C8EA00AL,
-        0x384FBDBDL, 0x4C11DB70L, 0x48D0C6C7L, 0x4593E01EL, 0x4152FDA9L,
-        0x5F15ADACL, 0x5BD4B01BL, 0x569796C2L, 0x52568B75L, 0x6A1936C8L,
-        0x6ED82B7FL, 0x639B0DA6L, 0x675A1011L, 0x791D4014L, 0x7DDC5DA3L,
-        0x709F7B7AL, 0x745E66CDL, 0x9823B6E0L, 0x9CE2AB57L, 0x91A18D8EL,
-        0x95609039L, 0x8B27C03CL, 0x8FE6DD8BL, 0x82A5FB52L, 0x8664E6E5L,
-        0xBE2B5B58L, 0xBAEA46EFL, 0xB7A96036L, 0xB3687D81L, 0xAD2F2D84L,
-        0xA9EE3033L, 0xA4AD16EAL, 0xA06C0B5DL, 0xD4326D90L, 0xD0F37027L,
-        0xDDB056FEL, 0xD9714B49L, 0xC7361B4CL, 0xC3F706FBL, 0xCEB42022L,
-        0xCA753D95L, 0xF23A8028L, 0xF6FB9D9FL, 0xFBB8BB46L, 0xFF79A6F1L,
-        0xE13EF6F4L, 0xE5FFEB43L, 0xE8BCCD9AL, 0xEC7DD02DL, 0x34867077L,
-        0x30476DC0L, 0x3D044B19L, 0x39C556AEL, 0x278206ABL, 0x23431B1CL,
-        0x2E003DC5L, 0x2AC12072L, 0x128E9DCFL, 0x164F8078L, 0x1B0CA6A1L,
-        0x1FCDBB16L, 0x018AEB13L, 0x054BF6A4L, 0x0808D07DL, 0x0CC9CDCAL,
-        0x7897AB07L, 0x7C56B6B0L, 0x71159069L, 0x75D48DDEL, 0x6B93DDDBL,
-        0x6F52C06CL, 0x6211E6B5L, 0x66D0FB02L, 0x5E9F46BFL, 0x5A5E5B08L,
-        0x571D7DD1L, 0x53DC6066L, 0x4D9B3063L, 0x495A2DD4L, 0x44190B0DL,
-        0x40D816BAL, 0xACA5C697L, 0xA864DB20L, 0xA527FDF9L, 0xA1E6E04EL,
-        0xBFA1B04BL, 0xBB60ADFCL, 0xB6238B25L, 0xB2E29692L, 0x8AAD2B2FL,
-        0x8E6C3698L, 0x832F1041L, 0x87EE0DF6L, 0x99A95DF3L, 0x9D684044L,
-        0x902B669DL, 0x94EA7B2AL, 0xE0B41DE7L, 0xE4750050L, 0xE9362689L,
-        0xEDF73B3EL, 0xF3B06B3BL, 0xF771768CL, 0xFA325055L, 0xFEF34DE2L,
-        0xC6BCF05FL, 0xC27DEDE8L, 0xCF3ECB31L, 0xCBFFD686L, 0xD5B88683L,
-        0xD1799B34L, 0xDC3ABDEDL, 0xD8FBA05AL, 0x690CE0EEL, 0x6DCDFD59L,
-        0x608EDB80L, 0x644FC637L, 0x7A089632L, 0x7EC98B85L, 0x738AAD5CL,
-        0x774BB0EBL, 0x4F040D56L, 0x4BC510E1L, 0x46863638L, 0x42472B8FL,
-        0x5C007B8AL, 0x58C1663DL, 0x558240E4L, 0x51435D53L, 0x251D3B9EL,
-        0x21DC2629L, 0x2C9F00F0L, 0x285E1D47L, 0x36194D42L, 0x32D850F5L,
-        0x3F9B762CL, 0x3B5A6B9BL, 0x0315D626L, 0x07D4CB91L, 0x0A97ED48L,
-        0x0E56F0FFL, 0x1011A0FAL, 0x14D0BD4DL, 0x19939B94L, 0x1D528623L,
-        0xF12F560EL, 0xF5EE4BB9L, 0xF8AD6D60L, 0xFC6C70D7L, 0xE22B20D2L,
-        0xE6EA3D65L, 0xEBA91BBCL, 0xEF68060BL, 0xD727BBB6L, 0xD3E6A601L,
-        0xDEA580D8L, 0xDA649D6FL, 0xC423CD6AL, 0xC0E2D0DDL, 0xCDA1F604L,
-        0xC960EBB3L, 0xBD3E8D7EL, 0xB9FF90C9L, 0xB4BCB610L, 0xB07DABA7L,
-        0xAE3AFBA2L, 0xAAFBE615L, 0xA7B8C0CCL, 0xA379DD7BL, 0x9B3660C6L,
-        0x9FF77D71L, 0x92B45BA8L, 0x9675461FL, 0x8832161AL, 0x8CF30BADL,
-        0x81B02D74L, 0x857130C3L, 0x5D8A9099L, 0x594B8D2EL, 0x5408ABF7L,
-        0x50C9B640L, 0x4E8EE645L, 0x4A4FFBF2L, 0x470CDD2BL, 0x43CDC09CL,
-        0x7B827D21L, 0x7F436096L, 0x7200464FL, 0x76C15BF8L, 0x68860BFDL,
-        0x6C47164AL, 0x61043093L, 0x65C52D24L, 0x119B4BE9L, 0x155A565EL,
-        0x18197087L, 0x1CD86D30L, 0x029F3D35L, 0x065E2082L, 0x0B1D065BL,
-        0x0FDC1BECL, 0x3793A651L, 0x3352BBE6L, 0x3E119D3FL, 0x3AD08088L,
-        0x2497D08DL, 0x2056CD3AL, 0x2D15EBE3L, 0x29D4F654L, 0xC5A92679L,
-        0xC1683BCEL, 0xCC2B1D17L, 0xC8EA00A0L, 0xD6AD50A5L, 0xD26C4D12L,
-        0xDF2F6BCBL, 0xDBEE767CL, 0xE3A1CBC1L, 0xE760D676L, 0xEA23F0AFL,
-        0xEEE2ED18L, 0xF0A5BD1DL, 0xF464A0AAL, 0xF9278673L, 0xFDE69BC4L,
-        0x89B8FD09L, 0x8D79E0BEL, 0x803AC667L, 0x84FBDBD0L, 0x9ABC8BD5L,
-        0x9E7D9662L, 0x933EB0BBL, 0x97FFAD0CL, 0xAFB010B1L, 0xAB710D06L,
-        0xA6322BDFL, 0xA2F33668L, 0xBCB4666DL, 0xB8757BDAL, 0xB5365D03L,
-        0xB1F740B4L
-};
 
-#define DO1(c, crc) ((crc) = senf::MPESectionParser::crc32tab_[((unsigned int)((crc)>>24) ^ (*c++)) & 0xff] ^ ((crc) << 8))
-#define DO2(c, crc)  DO1(c, crc); DO1(c, crc);
-#define DO4(c, crc)  DO2(c, crc); DO2(c, crc);
-#define DO8(c, crc)  DO4(c, crc); DO4(c, crc);
 prefix_ boost::uint32_t senf::MPESectionParser::calcCrc()
     const
 {
-//    return std::for_each(
-//            data().begin(),
-//            boost::prior(data().end(), 4),
-//            crc32_t() ).checksum();
-    register boost::uint32_t crc = 0xFFFFFFFF;
-    size_type len = data().size()-4;
-    byte *mem = &data()[0];
-
-    while( len >= 8) {
-        DO8(mem, crc);
-        len -= 8;
-    }
-    while( len ) {
-        DO1(mem, crc);
-        len--;
-    }
-
-    return crc;
-
+    return std::for_each(
+            data().begin(),
+            boost::prior(data().end(), 4),
+            crc32_t() ).checksum();
 }
 
 

Packets/MPEGDVBBundle/MPESection.hh

@@ -102,9 +102,7 @@ namespace senf {
         friend class MPESectionType;
 
     private:
-        //typedef boost::crc_optimal<32, 0x04C11DB7, 0xFFFFFFFF, 0, false, false> crc32_t;
-        static unsigned long crc32tab_[];
-
+        typedef boost::crc_optimal<32, 0x04C11DB7, 0xFFFFFFFF, 0, false, false> crc32_t;
     };