1*2c2f96dcSApple OSS Distributions /* 2*2c2f96dcSApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*2c2f96dcSApple OSS Distributions * 4*2c2f96dcSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*2c2f96dcSApple OSS Distributions * 6*2c2f96dcSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*2c2f96dcSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*2c2f96dcSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*2c2f96dcSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*2c2f96dcSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*2c2f96dcSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*2c2f96dcSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*2c2f96dcSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*2c2f96dcSApple OSS Distributions * 15*2c2f96dcSApple OSS Distributions * Please obtain a copy of the License at 16*2c2f96dcSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*2c2f96dcSApple OSS Distributions * 18*2c2f96dcSApple OSS Distributions * The Original Code and all software distributed under the License are 19*2c2f96dcSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*2c2f96dcSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*2c2f96dcSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*2c2f96dcSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*2c2f96dcSApple OSS Distributions * Please see the License for the specific language governing rights and 24*2c2f96dcSApple OSS Distributions * limitations under the License. 25*2c2f96dcSApple OSS Distributions * 26*2c2f96dcSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*2c2f96dcSApple OSS Distributions */ 28*2c2f96dcSApple OSS Distributions 29*2c2f96dcSApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*2c2f96dcSApple OSS Distributions * 31*2c2f96dcSApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*2c2f96dcSApple OSS Distributions * (high bits only or full match) scheme. 33*2c2f96dcSApple OSS Distributions * 34*2c2f96dcSApple OSS Distributions * Paul Wilson -- [email protected] 35*2c2f96dcSApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*2c2f96dcSApple OSS Distributions * September 1997 37*2c2f96dcSApple OSS Distributions */ 38*2c2f96dcSApple OSS Distributions 39*2c2f96dcSApple OSS Distributions /* compressed output format, in memory order 40*2c2f96dcSApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*2c2f96dcSApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*2c2f96dcSApple OSS Distributions * ii. an integer WORD offset into the page saying 43*2c2f96dcSApple OSS Distributions * where the queue position area starts 44*2c2f96dcSApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*2c2f96dcSApple OSS Distributions * the low-bits area starts 46*2c2f96dcSApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*2c2f96dcSApple OSS Distributions * low-bits area ends 48*2c2f96dcSApple OSS Distributions * 49*2c2f96dcSApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*2c2f96dcSApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*2c2f96dcSApple OSS Distributions * 52*2c2f96dcSApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*2c2f96dcSApple OSS Distributions * integral number of words) holding full-word patterns that 54*2c2f96dcSApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*2c2f96dcSApple OSS Distributions * 56*2c2f96dcSApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*2c2f96dcSApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*2c2f96dcSApple OSS Distributions * packed eight per word. 59*2c2f96dcSApple OSS Distributions * 60*2c2f96dcSApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*2c2f96dcSApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*2c2f96dcSApple OSS Distributions * (from partial matches), packed three per word. 63*2c2f96dcSApple OSS Distributions */ 64*2c2f96dcSApple OSS Distributions 65*2c2f96dcSApple OSS Distributions #ifdef __cplusplus 66*2c2f96dcSApple OSS Distributions extern "C" { 67*2c2f96dcSApple OSS Distributions #endif 68*2c2f96dcSApple OSS Distributions 69*2c2f96dcSApple OSS Distributions #include <mach/vm_param.h> 70*2c2f96dcSApple OSS Distributions 71*2c2f96dcSApple OSS Distributions 72*2c2f96dcSApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*2c2f96dcSApple OSS Distributions 74*2c2f96dcSApple OSS Distributions typedef unsigned int WK_word; 75*2c2f96dcSApple OSS Distributions 76*2c2f96dcSApple OSS Distributions #if defined(__arm64__) 77*2c2f96dcSApple OSS Distributions 78*2c2f96dcSApple OSS Distributions void 79*2c2f96dcSApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*2c2f96dcSApple OSS Distributions WK_word* dest_buf, 81*2c2f96dcSApple OSS Distributions WK_word* scratch, 82*2c2f96dcSApple OSS Distributions unsigned int bytes); 83*2c2f96dcSApple OSS Distributions int 84*2c2f96dcSApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*2c2f96dcSApple OSS Distributions WK_word* dest_buf, 86*2c2f96dcSApple OSS Distributions WK_word* scratch, 87*2c2f96dcSApple OSS Distributions unsigned int limit); 88*2c2f96dcSApple OSS Distributions 89*2c2f96dcSApple OSS Distributions void 90*2c2f96dcSApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*2c2f96dcSApple OSS Distributions WK_word* dest_buf, 92*2c2f96dcSApple OSS Distributions WK_word* scratch, 93*2c2f96dcSApple OSS Distributions unsigned int bytes); 94*2c2f96dcSApple OSS Distributions int 95*2c2f96dcSApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*2c2f96dcSApple OSS Distributions WK_word* dest_buf, 97*2c2f96dcSApple OSS Distributions WK_word* scratch, 98*2c2f96dcSApple OSS Distributions unsigned int limit); 99*2c2f96dcSApple OSS Distributions #else 100*2c2f96dcSApple OSS Distributions 101*2c2f96dcSApple OSS Distributions void 102*2c2f96dcSApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*2c2f96dcSApple OSS Distributions WK_word* dest_buf, 104*2c2f96dcSApple OSS Distributions WK_word* scratch, 105*2c2f96dcSApple OSS Distributions unsigned int bytes); 106*2c2f96dcSApple OSS Distributions int 107*2c2f96dcSApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*2c2f96dcSApple OSS Distributions WK_word* dest_buf, 109*2c2f96dcSApple OSS Distributions WK_word* scratch, 110*2c2f96dcSApple OSS Distributions unsigned int limit); 111*2c2f96dcSApple OSS Distributions #endif 112*2c2f96dcSApple OSS Distributions 113*2c2f96dcSApple OSS Distributions #ifdef __cplusplus 114*2c2f96dcSApple OSS Distributions } /* extern "C" */ 115*2c2f96dcSApple OSS Distributions #endif 116