1*e3723e1fSApple OSS Distributions /* 2*e3723e1fSApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*e3723e1fSApple OSS Distributions * 4*e3723e1fSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*e3723e1fSApple OSS Distributions * 6*e3723e1fSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*e3723e1fSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*e3723e1fSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*e3723e1fSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*e3723e1fSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*e3723e1fSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*e3723e1fSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*e3723e1fSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*e3723e1fSApple OSS Distributions * 15*e3723e1fSApple OSS Distributions * Please obtain a copy of the License at 16*e3723e1fSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*e3723e1fSApple OSS Distributions * 18*e3723e1fSApple OSS Distributions * The Original Code and all software distributed under the License are 19*e3723e1fSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*e3723e1fSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*e3723e1fSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*e3723e1fSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*e3723e1fSApple OSS Distributions * Please see the License for the specific language governing rights and 24*e3723e1fSApple OSS Distributions * limitations under the License. 25*e3723e1fSApple OSS Distributions * 26*e3723e1fSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*e3723e1fSApple OSS Distributions */ 28*e3723e1fSApple OSS Distributions 29*e3723e1fSApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*e3723e1fSApple OSS Distributions * 31*e3723e1fSApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*e3723e1fSApple OSS Distributions * (high bits only or full match) scheme. 33*e3723e1fSApple OSS Distributions * 34*e3723e1fSApple OSS Distributions * Paul Wilson -- [email protected] 35*e3723e1fSApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*e3723e1fSApple OSS Distributions * September 1997 37*e3723e1fSApple OSS Distributions */ 38*e3723e1fSApple OSS Distributions 39*e3723e1fSApple OSS Distributions /* compressed output format, in memory order 40*e3723e1fSApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*e3723e1fSApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*e3723e1fSApple OSS Distributions * ii. an integer WORD offset into the page saying 43*e3723e1fSApple OSS Distributions * where the queue position area starts 44*e3723e1fSApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*e3723e1fSApple OSS Distributions * the low-bits area starts 46*e3723e1fSApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*e3723e1fSApple OSS Distributions * low-bits area ends 48*e3723e1fSApple OSS Distributions * 49*e3723e1fSApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*e3723e1fSApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*e3723e1fSApple OSS Distributions * 52*e3723e1fSApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*e3723e1fSApple OSS Distributions * integral number of words) holding full-word patterns that 54*e3723e1fSApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*e3723e1fSApple OSS Distributions * 56*e3723e1fSApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*e3723e1fSApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*e3723e1fSApple OSS Distributions * packed eight per word. 59*e3723e1fSApple OSS Distributions * 60*e3723e1fSApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*e3723e1fSApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*e3723e1fSApple OSS Distributions * (from partial matches), packed three per word. 63*e3723e1fSApple OSS Distributions */ 64*e3723e1fSApple OSS Distributions 65*e3723e1fSApple OSS Distributions #ifdef __cplusplus 66*e3723e1fSApple OSS Distributions extern "C" { 67*e3723e1fSApple OSS Distributions #endif 68*e3723e1fSApple OSS Distributions 69*e3723e1fSApple OSS Distributions #include <mach/vm_param.h> 70*e3723e1fSApple OSS Distributions 71*e3723e1fSApple OSS Distributions 72*e3723e1fSApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*e3723e1fSApple OSS Distributions 74*e3723e1fSApple OSS Distributions typedef unsigned int WK_word; 75*e3723e1fSApple OSS Distributions 76*e3723e1fSApple OSS Distributions #if defined(__arm64__) 77*e3723e1fSApple OSS Distributions 78*e3723e1fSApple OSS Distributions void 79*e3723e1fSApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*e3723e1fSApple OSS Distributions WK_word* dest_buf, 81*e3723e1fSApple OSS Distributions WK_word* scratch, 82*e3723e1fSApple OSS Distributions unsigned int bytes); 83*e3723e1fSApple OSS Distributions int 84*e3723e1fSApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*e3723e1fSApple OSS Distributions WK_word* dest_buf, 86*e3723e1fSApple OSS Distributions WK_word* scratch, 87*e3723e1fSApple OSS Distributions unsigned int limit); 88*e3723e1fSApple OSS Distributions 89*e3723e1fSApple OSS Distributions void 90*e3723e1fSApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*e3723e1fSApple OSS Distributions WK_word* dest_buf, 92*e3723e1fSApple OSS Distributions WK_word* scratch, 93*e3723e1fSApple OSS Distributions unsigned int bytes); 94*e3723e1fSApple OSS Distributions int 95*e3723e1fSApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*e3723e1fSApple OSS Distributions WK_word* dest_buf, 97*e3723e1fSApple OSS Distributions WK_word* scratch, 98*e3723e1fSApple OSS Distributions unsigned int limit); 99*e3723e1fSApple OSS Distributions #else 100*e3723e1fSApple OSS Distributions 101*e3723e1fSApple OSS Distributions void 102*e3723e1fSApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*e3723e1fSApple OSS Distributions WK_word* dest_buf, 104*e3723e1fSApple OSS Distributions WK_word* scratch, 105*e3723e1fSApple OSS Distributions unsigned int bytes); 106*e3723e1fSApple OSS Distributions int 107*e3723e1fSApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*e3723e1fSApple OSS Distributions WK_word* dest_buf, 109*e3723e1fSApple OSS Distributions WK_word* scratch, 110*e3723e1fSApple OSS Distributions unsigned int limit); 111*e3723e1fSApple OSS Distributions #endif 112*e3723e1fSApple OSS Distributions 113*e3723e1fSApple OSS Distributions #ifdef __cplusplus 114*e3723e1fSApple OSS Distributions } /* extern "C" */ 115*e3723e1fSApple OSS Distributions #endif 116