1*aca3beaaSApple OSS Distributions /* 2*aca3beaaSApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*aca3beaaSApple OSS Distributions * 4*aca3beaaSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*aca3beaaSApple OSS Distributions * 6*aca3beaaSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*aca3beaaSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*aca3beaaSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*aca3beaaSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*aca3beaaSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*aca3beaaSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*aca3beaaSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*aca3beaaSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*aca3beaaSApple OSS Distributions * 15*aca3beaaSApple OSS Distributions * Please obtain a copy of the License at 16*aca3beaaSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*aca3beaaSApple OSS Distributions * 18*aca3beaaSApple OSS Distributions * The Original Code and all software distributed under the License are 19*aca3beaaSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*aca3beaaSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*aca3beaaSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*aca3beaaSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*aca3beaaSApple OSS Distributions * Please see the License for the specific language governing rights and 24*aca3beaaSApple OSS Distributions * limitations under the License. 25*aca3beaaSApple OSS Distributions * 26*aca3beaaSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*aca3beaaSApple OSS Distributions */ 28*aca3beaaSApple OSS Distributions 29*aca3beaaSApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*aca3beaaSApple OSS Distributions * 31*aca3beaaSApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*aca3beaaSApple OSS Distributions * (high bits only or full match) scheme. 33*aca3beaaSApple OSS Distributions * 34*aca3beaaSApple OSS Distributions * Paul Wilson -- [email protected] 35*aca3beaaSApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*aca3beaaSApple OSS Distributions * September 1997 37*aca3beaaSApple OSS Distributions */ 38*aca3beaaSApple OSS Distributions 39*aca3beaaSApple OSS Distributions /* compressed output format, in memory order 40*aca3beaaSApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*aca3beaaSApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*aca3beaaSApple OSS Distributions * ii. an integer WORD offset into the page saying 43*aca3beaaSApple OSS Distributions * where the queue position area starts 44*aca3beaaSApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*aca3beaaSApple OSS Distributions * the low-bits area starts 46*aca3beaaSApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*aca3beaaSApple OSS Distributions * low-bits area ends 48*aca3beaaSApple OSS Distributions * 49*aca3beaaSApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*aca3beaaSApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*aca3beaaSApple OSS Distributions * 52*aca3beaaSApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*aca3beaaSApple OSS Distributions * integral number of words) holding full-word patterns that 54*aca3beaaSApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*aca3beaaSApple OSS Distributions * 56*aca3beaaSApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*aca3beaaSApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*aca3beaaSApple OSS Distributions * packed eight per word. 59*aca3beaaSApple OSS Distributions * 60*aca3beaaSApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*aca3beaaSApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*aca3beaaSApple OSS Distributions * (from partial matches), packed three per word. 63*aca3beaaSApple OSS Distributions */ 64*aca3beaaSApple OSS Distributions 65*aca3beaaSApple OSS Distributions #ifdef __cplusplus 66*aca3beaaSApple OSS Distributions extern "C" { 67*aca3beaaSApple OSS Distributions #endif 68*aca3beaaSApple OSS Distributions 69*aca3beaaSApple OSS Distributions #include <mach/vm_param.h> 70*aca3beaaSApple OSS Distributions 71*aca3beaaSApple OSS Distributions 72*aca3beaaSApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*aca3beaaSApple OSS Distributions 74*aca3beaaSApple OSS Distributions typedef unsigned int WK_word; 75*aca3beaaSApple OSS Distributions 76*aca3beaaSApple OSS Distributions #if defined(__arm64__) 77*aca3beaaSApple OSS Distributions 78*aca3beaaSApple OSS Distributions void 79*aca3beaaSApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*aca3beaaSApple OSS Distributions WK_word* dest_buf, 81*aca3beaaSApple OSS Distributions WK_word* scratch, 82*aca3beaaSApple OSS Distributions unsigned int bytes); 83*aca3beaaSApple OSS Distributions int 84*aca3beaaSApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*aca3beaaSApple OSS Distributions WK_word* dest_buf, 86*aca3beaaSApple OSS Distributions WK_word* scratch, 87*aca3beaaSApple OSS Distributions unsigned int limit); 88*aca3beaaSApple OSS Distributions 89*aca3beaaSApple OSS Distributions void 90*aca3beaaSApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*aca3beaaSApple OSS Distributions WK_word* dest_buf, 92*aca3beaaSApple OSS Distributions WK_word* scratch, 93*aca3beaaSApple OSS Distributions unsigned int bytes); 94*aca3beaaSApple OSS Distributions int 95*aca3beaaSApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*aca3beaaSApple OSS Distributions WK_word* dest_buf, 97*aca3beaaSApple OSS Distributions WK_word* scratch, 98*aca3beaaSApple OSS Distributions unsigned int limit); 99*aca3beaaSApple OSS Distributions #else 100*aca3beaaSApple OSS Distributions 101*aca3beaaSApple OSS Distributions void 102*aca3beaaSApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*aca3beaaSApple OSS Distributions WK_word* dest_buf, 104*aca3beaaSApple OSS Distributions WK_word* scratch, 105*aca3beaaSApple OSS Distributions unsigned int bytes); 106*aca3beaaSApple OSS Distributions int 107*aca3beaaSApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*aca3beaaSApple OSS Distributions WK_word* dest_buf, 109*aca3beaaSApple OSS Distributions WK_word* scratch, 110*aca3beaaSApple OSS Distributions unsigned int limit); 111*aca3beaaSApple OSS Distributions #endif 112*aca3beaaSApple OSS Distributions 113*aca3beaaSApple OSS Distributions #ifdef __cplusplus 114*aca3beaaSApple OSS Distributions } /* extern "C" */ 115*aca3beaaSApple OSS Distributions #endif 116