1*fdd8201dSApple OSS Distributions /* 2*fdd8201dSApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*fdd8201dSApple OSS Distributions * 4*fdd8201dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*fdd8201dSApple OSS Distributions * 6*fdd8201dSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*fdd8201dSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*fdd8201dSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*fdd8201dSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*fdd8201dSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*fdd8201dSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*fdd8201dSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*fdd8201dSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*fdd8201dSApple OSS Distributions * 15*fdd8201dSApple OSS Distributions * Please obtain a copy of the License at 16*fdd8201dSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*fdd8201dSApple OSS Distributions * 18*fdd8201dSApple OSS Distributions * The Original Code and all software distributed under the License are 19*fdd8201dSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*fdd8201dSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*fdd8201dSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*fdd8201dSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*fdd8201dSApple OSS Distributions * Please see the License for the specific language governing rights and 24*fdd8201dSApple OSS Distributions * limitations under the License. 25*fdd8201dSApple OSS Distributions * 26*fdd8201dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*fdd8201dSApple OSS Distributions */ 28*fdd8201dSApple OSS Distributions 29*fdd8201dSApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*fdd8201dSApple OSS Distributions * 31*fdd8201dSApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*fdd8201dSApple OSS Distributions * (high bits only or full match) scheme. 33*fdd8201dSApple OSS Distributions * 34*fdd8201dSApple OSS Distributions * Paul Wilson -- [email protected] 35*fdd8201dSApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*fdd8201dSApple OSS Distributions * September 1997 37*fdd8201dSApple OSS Distributions */ 38*fdd8201dSApple OSS Distributions 39*fdd8201dSApple OSS Distributions /* compressed output format, in memory order 40*fdd8201dSApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*fdd8201dSApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*fdd8201dSApple OSS Distributions * ii. an integer WORD offset into the page saying 43*fdd8201dSApple OSS Distributions * where the queue position area starts 44*fdd8201dSApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*fdd8201dSApple OSS Distributions * the low-bits area starts 46*fdd8201dSApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*fdd8201dSApple OSS Distributions * low-bits area ends 48*fdd8201dSApple OSS Distributions * 49*fdd8201dSApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*fdd8201dSApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*fdd8201dSApple OSS Distributions * 52*fdd8201dSApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*fdd8201dSApple OSS Distributions * integral number of words) holding full-word patterns that 54*fdd8201dSApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*fdd8201dSApple OSS Distributions * 56*fdd8201dSApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*fdd8201dSApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*fdd8201dSApple OSS Distributions * packed eight per word. 59*fdd8201dSApple OSS Distributions * 60*fdd8201dSApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*fdd8201dSApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*fdd8201dSApple OSS Distributions * (from partial matches), packed three per word. 63*fdd8201dSApple OSS Distributions */ 64*fdd8201dSApple OSS Distributions 65*fdd8201dSApple OSS Distributions #ifdef __cplusplus 66*fdd8201dSApple OSS Distributions extern "C" { 67*fdd8201dSApple OSS Distributions #endif 68*fdd8201dSApple OSS Distributions 69*fdd8201dSApple OSS Distributions #include <mach/vm_param.h> 70*fdd8201dSApple OSS Distributions 71*fdd8201dSApple OSS Distributions 72*fdd8201dSApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*fdd8201dSApple OSS Distributions 74*fdd8201dSApple OSS Distributions typedef unsigned int WK_word; 75*fdd8201dSApple OSS Distributions 76*fdd8201dSApple OSS Distributions #if defined(__arm64__) 77*fdd8201dSApple OSS Distributions 78*fdd8201dSApple OSS Distributions void 79*fdd8201dSApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*fdd8201dSApple OSS Distributions WK_word* dest_buf, 81*fdd8201dSApple OSS Distributions WK_word* scratch, 82*fdd8201dSApple OSS Distributions unsigned int bytes); 83*fdd8201dSApple OSS Distributions int 84*fdd8201dSApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*fdd8201dSApple OSS Distributions WK_word* dest_buf, 86*fdd8201dSApple OSS Distributions WK_word* scratch, 87*fdd8201dSApple OSS Distributions unsigned int limit); 88*fdd8201dSApple OSS Distributions 89*fdd8201dSApple OSS Distributions void 90*fdd8201dSApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*fdd8201dSApple OSS Distributions WK_word* dest_buf, 92*fdd8201dSApple OSS Distributions WK_word* scratch, 93*fdd8201dSApple OSS Distributions unsigned int bytes); 94*fdd8201dSApple OSS Distributions int 95*fdd8201dSApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*fdd8201dSApple OSS Distributions WK_word* dest_buf, 97*fdd8201dSApple OSS Distributions WK_word* scratch, 98*fdd8201dSApple OSS Distributions unsigned int limit); 99*fdd8201dSApple OSS Distributions #else 100*fdd8201dSApple OSS Distributions 101*fdd8201dSApple OSS Distributions void 102*fdd8201dSApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*fdd8201dSApple OSS Distributions WK_word* dest_buf, 104*fdd8201dSApple OSS Distributions WK_word* scratch, 105*fdd8201dSApple OSS Distributions unsigned int bytes); 106*fdd8201dSApple OSS Distributions int 107*fdd8201dSApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*fdd8201dSApple OSS Distributions WK_word* dest_buf, 109*fdd8201dSApple OSS Distributions WK_word* scratch, 110*fdd8201dSApple OSS Distributions unsigned int limit); 111*fdd8201dSApple OSS Distributions #endif 112*fdd8201dSApple OSS Distributions 113*fdd8201dSApple OSS Distributions #ifdef __cplusplus 114*fdd8201dSApple OSS Distributions } /* extern "C" */ 115*fdd8201dSApple OSS Distributions #endif 116