1*4d495c6eSApple OSS Distributions /* 2*4d495c6eSApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*4d495c6eSApple OSS Distributions * 4*4d495c6eSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*4d495c6eSApple OSS Distributions * 6*4d495c6eSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*4d495c6eSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*4d495c6eSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*4d495c6eSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*4d495c6eSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*4d495c6eSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*4d495c6eSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*4d495c6eSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*4d495c6eSApple OSS Distributions * 15*4d495c6eSApple OSS Distributions * Please obtain a copy of the License at 16*4d495c6eSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*4d495c6eSApple OSS Distributions * 18*4d495c6eSApple OSS Distributions * The Original Code and all software distributed under the License are 19*4d495c6eSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*4d495c6eSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*4d495c6eSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*4d495c6eSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*4d495c6eSApple OSS Distributions * Please see the License for the specific language governing rights and 24*4d495c6eSApple OSS Distributions * limitations under the License. 25*4d495c6eSApple OSS Distributions * 26*4d495c6eSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*4d495c6eSApple OSS Distributions */ 28*4d495c6eSApple OSS Distributions 29*4d495c6eSApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*4d495c6eSApple OSS Distributions * 31*4d495c6eSApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*4d495c6eSApple OSS Distributions * (high bits only or full match) scheme. 33*4d495c6eSApple OSS Distributions * 34*4d495c6eSApple OSS Distributions * Paul Wilson -- [email protected] 35*4d495c6eSApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*4d495c6eSApple OSS Distributions * September 1997 37*4d495c6eSApple OSS Distributions */ 38*4d495c6eSApple OSS Distributions 39*4d495c6eSApple OSS Distributions /* compressed output format, in memory order 40*4d495c6eSApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*4d495c6eSApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*4d495c6eSApple OSS Distributions * ii. an integer WORD offset into the page saying 43*4d495c6eSApple OSS Distributions * where the queue position area starts 44*4d495c6eSApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*4d495c6eSApple OSS Distributions * the low-bits area starts 46*4d495c6eSApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*4d495c6eSApple OSS Distributions * low-bits area ends 48*4d495c6eSApple OSS Distributions * 49*4d495c6eSApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*4d495c6eSApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*4d495c6eSApple OSS Distributions * 52*4d495c6eSApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*4d495c6eSApple OSS Distributions * integral number of words) holding full-word patterns that 54*4d495c6eSApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*4d495c6eSApple OSS Distributions * 56*4d495c6eSApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*4d495c6eSApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*4d495c6eSApple OSS Distributions * packed eight per word. 59*4d495c6eSApple OSS Distributions * 60*4d495c6eSApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*4d495c6eSApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*4d495c6eSApple OSS Distributions * (from partial matches), packed three per word. 63*4d495c6eSApple OSS Distributions */ 64*4d495c6eSApple OSS Distributions 65*4d495c6eSApple OSS Distributions #ifdef __cplusplus 66*4d495c6eSApple OSS Distributions extern "C" { 67*4d495c6eSApple OSS Distributions #endif 68*4d495c6eSApple OSS Distributions 69*4d495c6eSApple OSS Distributions #include <mach/vm_param.h> 70*4d495c6eSApple OSS Distributions 71*4d495c6eSApple OSS Distributions 72*4d495c6eSApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*4d495c6eSApple OSS Distributions 74*4d495c6eSApple OSS Distributions typedef unsigned int WK_word; 75*4d495c6eSApple OSS Distributions 76*4d495c6eSApple OSS Distributions #if defined(__arm64__) 77*4d495c6eSApple OSS Distributions 78*4d495c6eSApple OSS Distributions void 79*4d495c6eSApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*4d495c6eSApple OSS Distributions WK_word* dest_buf, 81*4d495c6eSApple OSS Distributions WK_word* scratch, 82*4d495c6eSApple OSS Distributions unsigned int bytes); 83*4d495c6eSApple OSS Distributions int 84*4d495c6eSApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*4d495c6eSApple OSS Distributions WK_word* dest_buf, 86*4d495c6eSApple OSS Distributions WK_word* scratch, 87*4d495c6eSApple OSS Distributions unsigned int limit); 88*4d495c6eSApple OSS Distributions 89*4d495c6eSApple OSS Distributions void 90*4d495c6eSApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*4d495c6eSApple OSS Distributions WK_word* dest_buf, 92*4d495c6eSApple OSS Distributions WK_word* scratch, 93*4d495c6eSApple OSS Distributions unsigned int bytes); 94*4d495c6eSApple OSS Distributions int 95*4d495c6eSApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*4d495c6eSApple OSS Distributions WK_word* dest_buf, 97*4d495c6eSApple OSS Distributions WK_word* scratch, 98*4d495c6eSApple OSS Distributions unsigned int limit); 99*4d495c6eSApple OSS Distributions #else 100*4d495c6eSApple OSS Distributions 101*4d495c6eSApple OSS Distributions void 102*4d495c6eSApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*4d495c6eSApple OSS Distributions WK_word* dest_buf, 104*4d495c6eSApple OSS Distributions WK_word* scratch, 105*4d495c6eSApple OSS Distributions unsigned int bytes); 106*4d495c6eSApple OSS Distributions int 107*4d495c6eSApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*4d495c6eSApple OSS Distributions WK_word* dest_buf, 109*4d495c6eSApple OSS Distributions WK_word* scratch, 110*4d495c6eSApple OSS Distributions unsigned int limit); 111*4d495c6eSApple OSS Distributions #endif 112*4d495c6eSApple OSS Distributions 113*4d495c6eSApple OSS Distributions #ifdef __cplusplus 114*4d495c6eSApple OSS Distributions } /* extern "C" */ 115*4d495c6eSApple OSS Distributions #endif 116