1*e7776783SApple OSS Distributions /* 2*e7776783SApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*e7776783SApple OSS Distributions * 4*e7776783SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*e7776783SApple OSS Distributions * 6*e7776783SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*e7776783SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*e7776783SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*e7776783SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*e7776783SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*e7776783SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*e7776783SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*e7776783SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*e7776783SApple OSS Distributions * 15*e7776783SApple OSS Distributions * Please obtain a copy of the License at 16*e7776783SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*e7776783SApple OSS Distributions * 18*e7776783SApple OSS Distributions * The Original Code and all software distributed under the License are 19*e7776783SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*e7776783SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*e7776783SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*e7776783SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*e7776783SApple OSS Distributions * Please see the License for the specific language governing rights and 24*e7776783SApple OSS Distributions * limitations under the License. 25*e7776783SApple OSS Distributions * 26*e7776783SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*e7776783SApple OSS Distributions */ 28*e7776783SApple OSS Distributions 29*e7776783SApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*e7776783SApple OSS Distributions * 31*e7776783SApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*e7776783SApple OSS Distributions * (high bits only or full match) scheme. 33*e7776783SApple OSS Distributions * 34*e7776783SApple OSS Distributions * Paul Wilson -- [email protected] 35*e7776783SApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*e7776783SApple OSS Distributions * September 1997 37*e7776783SApple OSS Distributions */ 38*e7776783SApple OSS Distributions 39*e7776783SApple OSS Distributions /* compressed output format, in memory order 40*e7776783SApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*e7776783SApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*e7776783SApple OSS Distributions * ii. an integer WORD offset into the page saying 43*e7776783SApple OSS Distributions * where the queue position area starts 44*e7776783SApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*e7776783SApple OSS Distributions * the low-bits area starts 46*e7776783SApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*e7776783SApple OSS Distributions * low-bits area ends 48*e7776783SApple OSS Distributions * 49*e7776783SApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*e7776783SApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*e7776783SApple OSS Distributions * 52*e7776783SApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*e7776783SApple OSS Distributions * integral number of words) holding full-word patterns that 54*e7776783SApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*e7776783SApple OSS Distributions * 56*e7776783SApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*e7776783SApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*e7776783SApple OSS Distributions * packed eight per word. 59*e7776783SApple OSS Distributions * 60*e7776783SApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*e7776783SApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*e7776783SApple OSS Distributions * (from partial matches), packed three per word. 63*e7776783SApple OSS Distributions */ 64*e7776783SApple OSS Distributions 65*e7776783SApple OSS Distributions #ifdef __cplusplus 66*e7776783SApple OSS Distributions extern "C" { 67*e7776783SApple OSS Distributions #endif 68*e7776783SApple OSS Distributions 69*e7776783SApple OSS Distributions #include <mach/vm_param.h> 70*e7776783SApple OSS Distributions 71*e7776783SApple OSS Distributions 72*e7776783SApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*e7776783SApple OSS Distributions 74*e7776783SApple OSS Distributions typedef unsigned int WK_word; 75*e7776783SApple OSS Distributions 76*e7776783SApple OSS Distributions #if defined(__arm64__) 77*e7776783SApple OSS Distributions 78*e7776783SApple OSS Distributions void 79*e7776783SApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*e7776783SApple OSS Distributions WK_word* dest_buf, 81*e7776783SApple OSS Distributions WK_word* scratch, 82*e7776783SApple OSS Distributions unsigned int bytes); 83*e7776783SApple OSS Distributions int 84*e7776783SApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*e7776783SApple OSS Distributions WK_word* dest_buf, 86*e7776783SApple OSS Distributions WK_word* scratch, 87*e7776783SApple OSS Distributions unsigned int limit); 88*e7776783SApple OSS Distributions 89*e7776783SApple OSS Distributions void 90*e7776783SApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*e7776783SApple OSS Distributions WK_word* dest_buf, 92*e7776783SApple OSS Distributions WK_word* scratch, 93*e7776783SApple OSS Distributions unsigned int bytes); 94*e7776783SApple OSS Distributions int 95*e7776783SApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*e7776783SApple OSS Distributions WK_word* dest_buf, 97*e7776783SApple OSS Distributions WK_word* scratch, 98*e7776783SApple OSS Distributions unsigned int limit); 99*e7776783SApple OSS Distributions #else 100*e7776783SApple OSS Distributions 101*e7776783SApple OSS Distributions void 102*e7776783SApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*e7776783SApple OSS Distributions WK_word* dest_buf, 104*e7776783SApple OSS Distributions WK_word* scratch, 105*e7776783SApple OSS Distributions unsigned int bytes); 106*e7776783SApple OSS Distributions int 107*e7776783SApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*e7776783SApple OSS Distributions WK_word* dest_buf, 109*e7776783SApple OSS Distributions WK_word* scratch, 110*e7776783SApple OSS Distributions unsigned int limit); 111*e7776783SApple OSS Distributions #endif 112*e7776783SApple OSS Distributions 113*e7776783SApple OSS Distributions #ifdef __cplusplus 114*e7776783SApple OSS Distributions } /* extern "C" */ 115*e7776783SApple OSS Distributions #endif 116