X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Fsupport%2Flyxsum.C;h=213298cc0412cf7c4bc642359d6bee7ba69c65b1;hb=5e7275dabc36e1acb396c45ba27aecf8d8a0171e;hp=0f8304d11d8e5cc7ee225f0d5a661b862b500b26;hpb=ee7a1321a7e1538db895c77307a8dc021248f315;p=lyx.git diff --git a/src/support/lyxsum.C b/src/support/lyxsum.C index 0f8304d11d..213298cc04 100644 --- a/src/support/lyxsum.C +++ b/src/support/lyxsum.C @@ -1,13 +1,8 @@ /* This file is part of * ====================================================== - * - * LyX, The Document Processor * - * The function lyx::sum is taken from GNU textutill-1.22 - * and is there part of the program chsum. The cksum program - * is written by Q. Frank Xia, qx@math.columbia.edu. - * - * Modified for use in LyX by Lars G. Bjønnes. + * LyX, The Document Processor + * Copyright 2001 The LyX Team. * * ====================================================== */ @@ -15,106 +10,117 @@ #include +#include "support/lyxlib.h" +#include "debug.h" + +#include +#include + +using std::endl; + +// Various implementations of lyx::sum(), depending on what methods +// are available. Order is faster to slowest. +#if defined(HAVE_MMAP) && defined(HAVE_MUNMAP) + +// Make sure we get modern version of mmap and friends with void*, +// not `compatibility' version with caddr_t. +#define _POSIX_C_SOURCE 199506L + +#include +#include +#include +#include +#include + + +unsigned long lyx::sum(string const & file) +{ + lyxerr[Debug::FILES] << "lyx::sum() using mmap (lightning fast)" + << endl; + + int fd = open(file.c_str(), O_RDONLY); + if (!fd) + return 0; + + struct stat info; + fstat(fd, &info); + + void * mm = mmap(0, info.st_size, PROT_READ, + MAP_PRIVATE, fd, 0); + // Some platforms have the wrong type for MAP_FAILED (compaq cxx). + if (mm == reinterpret_cast(MAP_FAILED)) { + close(fd); + return 0; + } + + char * beg = static_cast(mm); + char * end = beg + info.st_size; + + boost::crc_32_type crc; + crc.process_block(beg, end); + unsigned long result = crc.checksum(); + + munmap(mm, info.st_size); + close(fd); + + return result; +} +#else // No mmap + #include #include -#include "support/lyxlib.h" - -using std::ifstream; -using std::ios; -using std::istream_iterator; +using std::for_each; namespace { -// DO _NOT_ CHANGE _ANYTHING_ IN THIS TABLE -unsigned long const crctab[256] = -{ - 0x0, - 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 -}; - -/* Calculate the checksum of file FILE. - Return crc if successful, 0 if an error occurs. */ - template inline unsigned long do_crc(InputIterator first, InputIterator last) { - unsigned long crc = 0; - long bytes_read = 0; - while (first != last) { - ++bytes_read; - crc = (crc << 8) - ^ crctab[((crc >> 24) ^ *first++) & 0xFF]; - } - while (bytes_read > 0) { - crc = (crc << 8) - ^ crctab[((crc >> 24) ^ bytes_read) & 0xFF]; - bytes_read >>= 8; - } - return ~crc & 0xFFFFFFFF; + boost::crc_32_type crc; + crc = for_each(first, last, crc); + return crc.checksum(); } } // namespace +#if HAVE_DECL_ISTREAMBUF_ITERATOR +using std::ifstream; +using std::istreambuf_iterator; + +unsigned long lyx::sum(string const & file) +{ + lyxerr[Debug::FILES] << "lyx::sum() using istreambuf_iterator (fast)" + << endl; + + ifstream ifs(file.c_str()); + if (!ifs) return 0; + + istreambuf_iterator beg(ifs); + istreambuf_iterator end; + + return do_crc(beg,end); +} +#else + +using std::istream_iterator; +using std::ios; -// And this would be the file interface. unsigned long lyx::sum(string const & file) { + lyxerr[Debug::FILES] + << "lyx::sum() using istream_iterator (slow as a snail)" + << endl; + ifstream ifs(file.c_str()); if (!ifs) return 0; + ifs.unsetf(ios::skipws); istream_iterator beg(ifs); istream_iterator end; - return do_crc(beg, end); + + return do_crc(beg,end); } +#endif +#endif // mmap