mirror of
https://github.com/mcneel/opennurbs.git
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271 lines
13 KiB
C++
271 lines
13 KiB
C++
/* $NoKeywords: $ */
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/*
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//
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// Copyright (c) 1993-2012 Robert McNeel & Associates. All rights reserved.
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// OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert
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// McNeel & Associates.
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//
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// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
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// ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF
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// MERCHANTABILITY ARE HEREBY DISCLAIMED.
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//
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// For complete openNURBS copyright information see <http://www.opennurbs.org>.
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//
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////////////////////////////////////////////////////////////////
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*/
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#include "opennurbs.h"
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#if !defined(ON_COMPILING_OPENNURBS)
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// This check is included in all opennurbs source .c and .cpp files to insure
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// ON_COMPILING_OPENNURBS is defined when opennurbs source is compiled.
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// When opennurbs source is being compiled, ON_COMPILING_OPENNURBS is defined
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// and the opennurbs .h files alter what is declared and how it is declared.
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#error ON_COMPILING_OPENNURBS must be defined when compiling opennurbs
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#endif
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ON__UINT16 ON_CRC16( ON__UINT16 current_remainder, size_t count, const void* p )
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{
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// 16 bit cyclic redundancy check using CCITT generator polynomial
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// CRC calculations are typically done something like this:
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//
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// const short crc_seed = 0; // or 1, or your favorite starting value
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//
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// // Compute CRC on "good" data
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// short first_crc = crc_seed;
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// first_crc = ON_CRC16( first_crc, size1, buffer1 );
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// ...
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// first_crc = ON_CRC16( first_crc, sizeN, bufferN );
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//
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// Do something that may potentially change the values in
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// the buffers (like storing them on a faulty disk).
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//
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// // Compute CRC on "suspect" data
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// short second_crc = crc_seed;
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// second_crc = ON_CRC16( second_crc, size1, buffer1 );
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// ...
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// second_crc = ON_CRC16( second_crc, sizeN, bufferN );
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// if ( ON_CRC16( second_crc, 2, &first_crc ) ) {
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// printf( "The value of at least one byte has changed.\n" );
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// }
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static ON__UINT16 ON_CRC16_CCITT_TABLE[256] =
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{0x0000,0x1021,0x2042,0x3063,0x4084,0x50A5,0x60C6,0x70E7,0x8108,0x9129,0xA14A,0xB16B,0xC18C,0xD1AD,0xE1CE,0xF1EF,
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0x1231,0x0210,0x3273,0x2252,0x52B5,0x4294,0x72F7,0x62D6,0x9339,0x8318,0xB37B,0xA35A,0xD3BD,0xC39C,0xF3FF,0xE3DE,
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0x2462,0x3443,0x0420,0x1401,0x64E6,0x74C7,0x44A4,0x5485,0xA56A,0xB54B,0x8528,0x9509,0xE5EE,0xF5CF,0xC5AC,0xD58D,
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0x3653,0x2672,0x1611,0x0630,0x76D7,0x66F6,0x5695,0x46B4,0xB75B,0xA77A,0x9719,0x8738,0xF7DF,0xE7FE,0xD79D,0xC7BC,
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0x48C4,0x58E5,0x6886,0x78A7,0x0840,0x1861,0x2802,0x3823,0xC9CC,0xD9ED,0xE98E,0xF9AF,0x8948,0x9969,0xA90A,0xB92B,
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0x5AF5,0x4AD4,0x7AB7,0x6A96,0x1A71,0x0A50,0x3A33,0x2A12,0xDBFD,0xCBDC,0xFBBF,0xEB9E,0x9B79,0x8B58,0xBB3B,0xAB1A,
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0x6CA6,0x7C87,0x4CE4,0x5CC5,0x2C22,0x3C03,0x0C60,0x1C41,0xEDAE,0xFD8F,0xCDEC,0xDDCD,0xAD2A,0xBD0B,0x8D68,0x9D49,
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0x7E97,0x6EB6,0x5ED5,0x4EF4,0x3E13,0x2E32,0x1E51,0x0E70,0xFF9F,0xEFBE,0xDFDD,0xCFFC,0xBF1B,0xAF3A,0x9F59,0x8F78,
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0x9188,0x81A9,0xB1CA,0xA1EB,0xD10C,0xC12D,0xF14E,0xE16F,0x1080,0x00A1,0x30C2,0x20E3,0x5004,0x4025,0x7046,0x6067,
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0x83B9,0x9398,0xA3FB,0xB3DA,0xC33D,0xD31C,0xE37F,0xF35E,0x02B1,0x1290,0x22F3,0x32D2,0x4235,0x5214,0x6277,0x7256,
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0xB5EA,0xA5CB,0x95A8,0x8589,0xF56E,0xE54F,0xD52C,0xC50D,0x34E2,0x24C3,0x14A0,0x0481,0x7466,0x6447,0x5424,0x4405,
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0xA7DB,0xB7FA,0x8799,0x97B8,0xE75F,0xF77E,0xC71D,0xD73C,0x26D3,0x36F2,0x0691,0x16B0,0x6657,0x7676,0x4615,0x5634,
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0xD94C,0xC96D,0xF90E,0xE92F,0x99C8,0x89E9,0xB98A,0xA9AB,0x5844,0x4865,0x7806,0x6827,0x18C0,0x08E1,0x3882,0x28A3,
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0xCB7D,0xDB5C,0xEB3F,0xFB1E,0x8BF9,0x9BD8,0xABBB,0xBB9A,0x4A75,0x5A54,0x6A37,0x7A16,0x0AF1,0x1AD0,0x2AB3,0x3A92,
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0xFD2E,0xED0F,0xDD6C,0xCD4D,0xBDAA,0xAD8B,0x9DE8,0x8DC9,0x7C26,0x6C07,0x5C64,0x4C45,0x3CA2,0x2C83,0x1CE0,0x0CC1,
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0xEF1F,0xFF3E,0xCF5D,0xDF7C,0xAF9B,0xBFBA,0x8FD9,0x9FF8,0x6E17,0x7E36,0x4E55,0x5E74,0x2E93,0x3EB2,0x0ED1,0x1EF0};
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const unsigned char* b = (const unsigned char*)p;
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if ( count > 0 && b )
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{
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ON__UINT16 r1;
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// update crc remainder
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while (count >= 8)
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{
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// while() loop unrolled for speed
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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count -= 8;
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}
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while (count--)
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{
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r1 = ON_CRC16_CCITT_TABLE[(current_remainder & ((ON__UINT16)0xff00))>>8];
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current_remainder = (current_remainder << 8) ^ (*b++);
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current_remainder ^= r1;
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}
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}
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return current_remainder;
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}
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ON__UINT32 ON_CRC32( ON__UINT32 current_remainder, size_t count, const void* p )
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{
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/*
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//////////////////////////////////////////////////////////////////////////////////////////
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//
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// ON_CRC32() is a slightly altered version of zlib 1.3.3's crc32()
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// and the zlib "legal stuff" is reproduced below.
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//
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// ON_CRC32() and crc32() compute the same values. ON_CRC32() was renamed
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// so it wouldn't clash with the other crc32()'s that are out there and the
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// argument order was switched to match that used by the legacy ON_CRC16().
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//
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//////////////////////////////////////////////////////////////////////////////////////////
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zlib.h -- interface of the 'zlib' general purpose compression library
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version 1.1.3, July 9th, 1998
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Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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Jean-loup Gailly Mark Adler
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jloup@gzip.org madler@alumni.caltech.edu
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The data format used by the zlib library is described by RFCs (Request for
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Comments) 1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt
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(zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
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*/
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/*
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ON_CRC32_ZLIB_TABLE[] is a table for a byte-wise 32-bit CRC calculation
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using the generator polynomial:
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x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
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*/
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static ON__UINT32 ON_CRC32_ZLIB_TABLE[256] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
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0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
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0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
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0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
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0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
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0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
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0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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0x2d02ef8d
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};
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if ( count > 0 && p )
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{
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const unsigned char* b = (const unsigned char*)p;
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// The trailing L was needed long ago when "int" was often a 16 bit integers.
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// Today it is more common for "int" to be a 32 bit integer and
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// L to be a 32 or 64 bit integer. So, the L is causing more
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// problems that it is fixing.
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// current_remainder ^= 0xffffffffL;
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current_remainder ^= 0xffffffff;
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//// // The loop unwrapping was done almost 20 years ago. We need to run tests to
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//// // see if it does anything with current compilers and computers.
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////#if defined (ON_RUNTIME_WIN)
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//// // This slows down the Mac implementation by 50%
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//// while (count >= 8)
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//// {
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//// // while() loop unrolled for speed
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//// current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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//// current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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//// current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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//// current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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//// current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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//// current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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//// current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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//// current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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//// count -= 8;
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//// }
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////#endif
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while(count--)
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{
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current_remainder = ON_CRC32_ZLIB_TABLE[((int)current_remainder ^ (*b++)) & 0xff] ^ (current_remainder >> 8);
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}
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// The trailing L was needed long ago when "int" was often a 16 bit integers.
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// Today it is more common for "int" to be a 32 bit integer and
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// L to be a 32 or 64 bit integer. So, the L is causing more
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// problems than it is fixing.
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//current_remainder ^= 0xffffffffL;
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current_remainder ^= 0xffffffff;
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}
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return current_remainder;
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}
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