1*c54f35caSApple OSS Distributions /* 2*c54f35caSApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*c54f35caSApple OSS Distributions * 4*c54f35caSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*c54f35caSApple OSS Distributions * 6*c54f35caSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*c54f35caSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*c54f35caSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*c54f35caSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*c54f35caSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*c54f35caSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*c54f35caSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*c54f35caSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*c54f35caSApple OSS Distributions * 15*c54f35caSApple OSS Distributions * Please obtain a copy of the License at 16*c54f35caSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*c54f35caSApple OSS Distributions * 18*c54f35caSApple OSS Distributions * The Original Code and all software distributed under the License are 19*c54f35caSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*c54f35caSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*c54f35caSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*c54f35caSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*c54f35caSApple OSS Distributions * Please see the License for the specific language governing rights and 24*c54f35caSApple OSS Distributions * limitations under the License. 25*c54f35caSApple OSS Distributions * 26*c54f35caSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*c54f35caSApple OSS Distributions */ 28*c54f35caSApple OSS Distributions 29*c54f35caSApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*c54f35caSApple OSS Distributions * 31*c54f35caSApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*c54f35caSApple OSS Distributions * (high bits only or full match) scheme. 33*c54f35caSApple OSS Distributions * 34*c54f35caSApple OSS Distributions * Paul Wilson -- [email protected] 35*c54f35caSApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*c54f35caSApple OSS Distributions * September 1997 37*c54f35caSApple OSS Distributions */ 38*c54f35caSApple OSS Distributions 39*c54f35caSApple OSS Distributions /* compressed output format, in memory order 40*c54f35caSApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*c54f35caSApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*c54f35caSApple OSS Distributions * ii. an integer WORD offset into the page saying 43*c54f35caSApple OSS Distributions * where the queue position area starts 44*c54f35caSApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*c54f35caSApple OSS Distributions * the low-bits area starts 46*c54f35caSApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*c54f35caSApple OSS Distributions * low-bits area ends 48*c54f35caSApple OSS Distributions * 49*c54f35caSApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*c54f35caSApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*c54f35caSApple OSS Distributions * 52*c54f35caSApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*c54f35caSApple OSS Distributions * integral number of words) holding full-word patterns that 54*c54f35caSApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*c54f35caSApple OSS Distributions * 56*c54f35caSApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*c54f35caSApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*c54f35caSApple OSS Distributions * packed eight per word. 59*c54f35caSApple OSS Distributions * 60*c54f35caSApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*c54f35caSApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*c54f35caSApple OSS Distributions * (from partial matches), packed three per word. 63*c54f35caSApple OSS Distributions */ 64*c54f35caSApple OSS Distributions 65*c54f35caSApple OSS Distributions #ifdef __cplusplus 66*c54f35caSApple OSS Distributions extern "C" { 67*c54f35caSApple OSS Distributions #endif 68*c54f35caSApple OSS Distributions 69*c54f35caSApple OSS Distributions #include <mach/vm_param.h> 70*c54f35caSApple OSS Distributions 71*c54f35caSApple OSS Distributions 72*c54f35caSApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*c54f35caSApple OSS Distributions 74*c54f35caSApple OSS Distributions typedef unsigned int WK_word; 75*c54f35caSApple OSS Distributions 76*c54f35caSApple OSS Distributions #if defined(__arm64__) 77*c54f35caSApple OSS Distributions 78*c54f35caSApple OSS Distributions void 79*c54f35caSApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*c54f35caSApple OSS Distributions WK_word* dest_buf, 81*c54f35caSApple OSS Distributions WK_word* scratch, 82*c54f35caSApple OSS Distributions unsigned int bytes); 83*c54f35caSApple OSS Distributions int 84*c54f35caSApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*c54f35caSApple OSS Distributions WK_word* dest_buf, 86*c54f35caSApple OSS Distributions WK_word* scratch, 87*c54f35caSApple OSS Distributions unsigned int limit); 88*c54f35caSApple OSS Distributions 89*c54f35caSApple OSS Distributions void 90*c54f35caSApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*c54f35caSApple OSS Distributions WK_word* dest_buf, 92*c54f35caSApple OSS Distributions WK_word* scratch, 93*c54f35caSApple OSS Distributions unsigned int bytes); 94*c54f35caSApple OSS Distributions int 95*c54f35caSApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*c54f35caSApple OSS Distributions WK_word* dest_buf, 97*c54f35caSApple OSS Distributions WK_word* scratch, 98*c54f35caSApple OSS Distributions unsigned int limit); 99*c54f35caSApple OSS Distributions #else 100*c54f35caSApple OSS Distributions 101*c54f35caSApple OSS Distributions void 102*c54f35caSApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*c54f35caSApple OSS Distributions WK_word* dest_buf, 104*c54f35caSApple OSS Distributions WK_word* scratch, 105*c54f35caSApple OSS Distributions unsigned int bytes); 106*c54f35caSApple OSS Distributions int 107*c54f35caSApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*c54f35caSApple OSS Distributions WK_word* dest_buf, 109*c54f35caSApple OSS Distributions WK_word* scratch, 110*c54f35caSApple OSS Distributions unsigned int limit); 111*c54f35caSApple OSS Distributions #endif 112*c54f35caSApple OSS Distributions 113*c54f35caSApple OSS Distributions #ifdef __cplusplus 114*c54f35caSApple OSS Distributions } /* extern "C" */ 115*c54f35caSApple OSS Distributions #endif 116