1*d4514f0bSApple OSS Distributions /* 2*d4514f0bSApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*d4514f0bSApple OSS Distributions * 4*d4514f0bSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*d4514f0bSApple OSS Distributions * 6*d4514f0bSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*d4514f0bSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*d4514f0bSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*d4514f0bSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*d4514f0bSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*d4514f0bSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*d4514f0bSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*d4514f0bSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*d4514f0bSApple OSS Distributions * 15*d4514f0bSApple OSS Distributions * Please obtain a copy of the License at 16*d4514f0bSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*d4514f0bSApple OSS Distributions * 18*d4514f0bSApple OSS Distributions * The Original Code and all software distributed under the License are 19*d4514f0bSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*d4514f0bSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*d4514f0bSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*d4514f0bSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*d4514f0bSApple OSS Distributions * Please see the License for the specific language governing rights and 24*d4514f0bSApple OSS Distributions * limitations under the License. 25*d4514f0bSApple OSS Distributions * 26*d4514f0bSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*d4514f0bSApple OSS Distributions */ 28*d4514f0bSApple OSS Distributions 29*d4514f0bSApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*d4514f0bSApple OSS Distributions * 31*d4514f0bSApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*d4514f0bSApple OSS Distributions * (high bits only or full match) scheme. 33*d4514f0bSApple OSS Distributions * 34*d4514f0bSApple OSS Distributions * Paul Wilson -- [email protected] 35*d4514f0bSApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*d4514f0bSApple OSS Distributions * September 1997 37*d4514f0bSApple OSS Distributions */ 38*d4514f0bSApple OSS Distributions 39*d4514f0bSApple OSS Distributions /* compressed output format, in memory order 40*d4514f0bSApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*d4514f0bSApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*d4514f0bSApple OSS Distributions * ii. an integer WORD offset into the page saying 43*d4514f0bSApple OSS Distributions * where the queue position area starts 44*d4514f0bSApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*d4514f0bSApple OSS Distributions * the low-bits area starts 46*d4514f0bSApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*d4514f0bSApple OSS Distributions * low-bits area ends 48*d4514f0bSApple OSS Distributions * 49*d4514f0bSApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*d4514f0bSApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*d4514f0bSApple OSS Distributions * 52*d4514f0bSApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*d4514f0bSApple OSS Distributions * integral number of words) holding full-word patterns that 54*d4514f0bSApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*d4514f0bSApple OSS Distributions * 56*d4514f0bSApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*d4514f0bSApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*d4514f0bSApple OSS Distributions * packed eight per word. 59*d4514f0bSApple OSS Distributions * 60*d4514f0bSApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*d4514f0bSApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*d4514f0bSApple OSS Distributions * (from partial matches), packed three per word. 63*d4514f0bSApple OSS Distributions */ 64*d4514f0bSApple OSS Distributions 65*d4514f0bSApple OSS Distributions #ifdef __cplusplus 66*d4514f0bSApple OSS Distributions extern "C" { 67*d4514f0bSApple OSS Distributions #endif 68*d4514f0bSApple OSS Distributions 69*d4514f0bSApple OSS Distributions #include <mach/vm_param.h> 70*d4514f0bSApple OSS Distributions 71*d4514f0bSApple OSS Distributions 72*d4514f0bSApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*d4514f0bSApple OSS Distributions 74*d4514f0bSApple OSS Distributions typedef unsigned int WK_word; 75*d4514f0bSApple OSS Distributions 76*d4514f0bSApple OSS Distributions #if defined(__arm64__) 77*d4514f0bSApple OSS Distributions 78*d4514f0bSApple OSS Distributions void 79*d4514f0bSApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*d4514f0bSApple OSS Distributions WK_word* dest_buf, 81*d4514f0bSApple OSS Distributions WK_word* scratch, 82*d4514f0bSApple OSS Distributions unsigned int bytes); 83*d4514f0bSApple OSS Distributions int 84*d4514f0bSApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*d4514f0bSApple OSS Distributions WK_word* dest_buf, 86*d4514f0bSApple OSS Distributions WK_word* scratch, 87*d4514f0bSApple OSS Distributions unsigned int limit); 88*d4514f0bSApple OSS Distributions 89*d4514f0bSApple OSS Distributions void 90*d4514f0bSApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*d4514f0bSApple OSS Distributions WK_word* dest_buf, 92*d4514f0bSApple OSS Distributions WK_word* scratch, 93*d4514f0bSApple OSS Distributions unsigned int bytes); 94*d4514f0bSApple OSS Distributions int 95*d4514f0bSApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*d4514f0bSApple OSS Distributions WK_word* dest_buf, 97*d4514f0bSApple OSS Distributions WK_word* scratch, 98*d4514f0bSApple OSS Distributions unsigned int limit); 99*d4514f0bSApple OSS Distributions #else 100*d4514f0bSApple OSS Distributions 101*d4514f0bSApple OSS Distributions void 102*d4514f0bSApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*d4514f0bSApple OSS Distributions WK_word* dest_buf, 104*d4514f0bSApple OSS Distributions WK_word* scratch, 105*d4514f0bSApple OSS Distributions unsigned int bytes); 106*d4514f0bSApple OSS Distributions int 107*d4514f0bSApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*d4514f0bSApple OSS Distributions WK_word* dest_buf, 109*d4514f0bSApple OSS Distributions WK_word* scratch, 110*d4514f0bSApple OSS Distributions unsigned int limit); 111*d4514f0bSApple OSS Distributions #endif 112*d4514f0bSApple OSS Distributions 113*d4514f0bSApple OSS Distributions #ifdef __cplusplus 114*d4514f0bSApple OSS Distributions } /* extern "C" */ 115*d4514f0bSApple OSS Distributions #endif 116