1*8d741a5dSApple OSS Distributions /* 2*8d741a5dSApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*8d741a5dSApple OSS Distributions * 4*8d741a5dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*8d741a5dSApple OSS Distributions * 6*8d741a5dSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*8d741a5dSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*8d741a5dSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*8d741a5dSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*8d741a5dSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*8d741a5dSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*8d741a5dSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*8d741a5dSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*8d741a5dSApple OSS Distributions * 15*8d741a5dSApple OSS Distributions * Please obtain a copy of the License at 16*8d741a5dSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*8d741a5dSApple OSS Distributions * 18*8d741a5dSApple OSS Distributions * The Original Code and all software distributed under the License are 19*8d741a5dSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*8d741a5dSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*8d741a5dSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*8d741a5dSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*8d741a5dSApple OSS Distributions * Please see the License for the specific language governing rights and 24*8d741a5dSApple OSS Distributions * limitations under the License. 25*8d741a5dSApple OSS Distributions * 26*8d741a5dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*8d741a5dSApple OSS Distributions */ 28*8d741a5dSApple OSS Distributions 29*8d741a5dSApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*8d741a5dSApple OSS Distributions * 31*8d741a5dSApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*8d741a5dSApple OSS Distributions * (high bits only or full match) scheme. 33*8d741a5dSApple OSS Distributions * 34*8d741a5dSApple OSS Distributions * Paul Wilson -- [email protected] 35*8d741a5dSApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*8d741a5dSApple OSS Distributions * September 1997 37*8d741a5dSApple OSS Distributions */ 38*8d741a5dSApple OSS Distributions 39*8d741a5dSApple OSS Distributions /* compressed output format, in memory order 40*8d741a5dSApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*8d741a5dSApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*8d741a5dSApple OSS Distributions * ii. an integer WORD offset into the page saying 43*8d741a5dSApple OSS Distributions * where the queue position area starts 44*8d741a5dSApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*8d741a5dSApple OSS Distributions * the low-bits area starts 46*8d741a5dSApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*8d741a5dSApple OSS Distributions * low-bits area ends 48*8d741a5dSApple OSS Distributions * 49*8d741a5dSApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*8d741a5dSApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*8d741a5dSApple OSS Distributions * 52*8d741a5dSApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*8d741a5dSApple OSS Distributions * integral number of words) holding full-word patterns that 54*8d741a5dSApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*8d741a5dSApple OSS Distributions * 56*8d741a5dSApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*8d741a5dSApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*8d741a5dSApple OSS Distributions * packed eight per word. 59*8d741a5dSApple OSS Distributions * 60*8d741a5dSApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*8d741a5dSApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*8d741a5dSApple OSS Distributions * (from partial matches), packed three per word. 63*8d741a5dSApple OSS Distributions */ 64*8d741a5dSApple OSS Distributions 65*8d741a5dSApple OSS Distributions #ifdef __cplusplus 66*8d741a5dSApple OSS Distributions extern "C" { 67*8d741a5dSApple OSS Distributions #endif 68*8d741a5dSApple OSS Distributions 69*8d741a5dSApple OSS Distributions #include <mach/vm_param.h> 70*8d741a5dSApple OSS Distributions 71*8d741a5dSApple OSS Distributions 72*8d741a5dSApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*8d741a5dSApple OSS Distributions 74*8d741a5dSApple OSS Distributions typedef unsigned int WK_word; 75*8d741a5dSApple OSS Distributions 76*8d741a5dSApple OSS Distributions #if defined(__arm64__) 77*8d741a5dSApple OSS Distributions 78*8d741a5dSApple OSS Distributions void 79*8d741a5dSApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*8d741a5dSApple OSS Distributions WK_word* dest_buf, 81*8d741a5dSApple OSS Distributions WK_word* scratch, 82*8d741a5dSApple OSS Distributions unsigned int bytes); 83*8d741a5dSApple OSS Distributions int 84*8d741a5dSApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*8d741a5dSApple OSS Distributions WK_word* dest_buf, 86*8d741a5dSApple OSS Distributions WK_word* scratch, 87*8d741a5dSApple OSS Distributions unsigned int limit); 88*8d741a5dSApple OSS Distributions 89*8d741a5dSApple OSS Distributions void 90*8d741a5dSApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*8d741a5dSApple OSS Distributions WK_word* dest_buf, 92*8d741a5dSApple OSS Distributions WK_word* scratch, 93*8d741a5dSApple OSS Distributions unsigned int bytes); 94*8d741a5dSApple OSS Distributions int 95*8d741a5dSApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*8d741a5dSApple OSS Distributions WK_word* dest_buf, 97*8d741a5dSApple OSS Distributions WK_word* scratch, 98*8d741a5dSApple OSS Distributions unsigned int limit); 99*8d741a5dSApple OSS Distributions #else 100*8d741a5dSApple OSS Distributions 101*8d741a5dSApple OSS Distributions void 102*8d741a5dSApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*8d741a5dSApple OSS Distributions WK_word* dest_buf, 104*8d741a5dSApple OSS Distributions WK_word* scratch, 105*8d741a5dSApple OSS Distributions unsigned int bytes); 106*8d741a5dSApple OSS Distributions int 107*8d741a5dSApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*8d741a5dSApple OSS Distributions WK_word* dest_buf, 109*8d741a5dSApple OSS Distributions WK_word* scratch, 110*8d741a5dSApple OSS Distributions unsigned int limit); 111*8d741a5dSApple OSS Distributions #endif 112*8d741a5dSApple OSS Distributions 113*8d741a5dSApple OSS Distributions #ifdef __cplusplus 114*8d741a5dSApple OSS Distributions } /* extern "C" */ 115*8d741a5dSApple OSS Distributions #endif 116