/*
 * Copyright 2012-2013 Intel Corporation All Rights Reserved.
 * All rights reserved.
 *
 * http://opensource.org/licenses/BSD-3-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 *
 * * Neither the name of the Intel Corporation nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "include/int_types.h"

#include <stdlib.h>

#define MAX_ITER	8

unsigned long crc32_table_iscsi_base[256] = {
	0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4, 
	0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB, 
	0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B, 
	0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24, 
	0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B, 
	0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384, 
	0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54, 
	0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B, 
	0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A, 
	0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35, 
	0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5, 
	0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA, 
	0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45, 
	0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A, 
	0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A, 
	0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595, 
	0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48, 
	0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957, 
	0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687, 
	0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198, 
	0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927, 
	0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38, 
	0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8, 
	0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7, 
	0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096, 
	0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789, 
	0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859, 
	0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46, 
	0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9, 
	0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6, 
	0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36, 
	0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829, 
	0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C, 
	0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93, 
	0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043, 
	0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C, 
	0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3, 
	0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC, 
	0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C, 
	0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033, 
	0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652, 
	0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D, 
	0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D, 
	0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982, 
	0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D, 
	0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622, 
	0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2, 
	0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED, 
	0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530, 
	0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F, 
	0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF, 
	0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0, 
	0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F, 
	0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540, 
	0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90, 
	0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F, 
	0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE, 
	0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1, 
	0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321, 
	0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E, 
	0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81, 
	0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E, 
	0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E, 
	0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351, 
};


// iSCSI CRC baseline function
uint32_t ceph_crc32c_intel_baseline(uint32_t crc_init2, unsigned char const *buffer, unsigned len)
{
	unsigned int crc_init = crc_init2;
	unsigned int crc;
	unsigned char* p_buf;

	if (buffer) {
		p_buf = (unsigned char*)buffer;
		unsigned char const * p_end = buffer + len;

		crc = crc_init;

		while (p_buf < (unsigned char *) p_end ){
			crc = (crc >> 8) ^ crc32_table_iscsi_base[(crc & 0x000000FF) ^ *p_buf++];
		}
	} else {
		crc = crc_init;
		while (len--) {
			crc = (crc >> 8) ^ crc32_table_iscsi_base[(crc & 0x000000FF)];
		}

	}
	return crc;	 
}
