1*19c3b8c2SApple OSS Distributions /* 2*19c3b8c2SApple OSS Distributions * Copyright (c) 2000-2013 Apple Inc. All rights reserved. 3*19c3b8c2SApple OSS Distributions * 4*19c3b8c2SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*19c3b8c2SApple OSS Distributions * 6*19c3b8c2SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*19c3b8c2SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*19c3b8c2SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*19c3b8c2SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*19c3b8c2SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*19c3b8c2SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*19c3b8c2SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*19c3b8c2SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*19c3b8c2SApple OSS Distributions * 15*19c3b8c2SApple OSS Distributions * Please obtain a copy of the License at 16*19c3b8c2SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*19c3b8c2SApple OSS Distributions * 18*19c3b8c2SApple OSS Distributions * The Original Code and all software distributed under the License are 19*19c3b8c2SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*19c3b8c2SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*19c3b8c2SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*19c3b8c2SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*19c3b8c2SApple OSS Distributions * Please see the License for the specific language governing rights and 24*19c3b8c2SApple OSS Distributions * limitations under the License. 25*19c3b8c2SApple OSS Distributions * 26*19c3b8c2SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*19c3b8c2SApple OSS Distributions */ 28*19c3b8c2SApple OSS Distributions 29*19c3b8c2SApple OSS Distributions /* direct-mapped partial matching compressor with simple 22/10 split 30*19c3b8c2SApple OSS Distributions * 31*19c3b8c2SApple OSS Distributions * Compresses buffers using a dictionary based match and partial match 32*19c3b8c2SApple OSS Distributions * (high bits only or full match) scheme. 33*19c3b8c2SApple OSS Distributions * 34*19c3b8c2SApple OSS Distributions * Paul Wilson -- [email protected] 35*19c3b8c2SApple OSS Distributions * Scott F. Kaplan -- [email protected] 36*19c3b8c2SApple OSS Distributions * September 1997 37*19c3b8c2SApple OSS Distributions */ 38*19c3b8c2SApple OSS Distributions 39*19c3b8c2SApple OSS Distributions /* compressed output format, in memory order 40*19c3b8c2SApple OSS Distributions * 1. a four-word HEADER containing four one-word values: 41*19c3b8c2SApple OSS Distributions * i. a one-word code saying what algorithm compressed the data 42*19c3b8c2SApple OSS Distributions * ii. an integer WORD offset into the page saying 43*19c3b8c2SApple OSS Distributions * where the queue position area starts 44*19c3b8c2SApple OSS Distributions * iii. an integer WORD offset into the page saying where 45*19c3b8c2SApple OSS Distributions * the low-bits area starts 46*19c3b8c2SApple OSS Distributions * iv. an integer WORD offset into the page saying where the 47*19c3b8c2SApple OSS Distributions * low-bits area ends 48*19c3b8c2SApple OSS Distributions * 49*19c3b8c2SApple OSS Distributions * 2. a 64-word TAGS AREA holding one two-bit tag for each word in 50*19c3b8c2SApple OSS Distributions * the original (1024-word) page, packed 16 per word 51*19c3b8c2SApple OSS Distributions * 52*19c3b8c2SApple OSS Distributions * 3. a variable-sized FULL WORDS AREA (always word aligned and an 53*19c3b8c2SApple OSS Distributions * integral number of words) holding full-word patterns that 54*19c3b8c2SApple OSS Distributions * were not in the dictionary when encoded (i.e., dictionary misses) 55*19c3b8c2SApple OSS Distributions * 56*19c3b8c2SApple OSS Distributions * 4. a variable-sized QUEUE POSITIONS AREA (always word aligned and 57*19c3b8c2SApple OSS Distributions * an integral number of words) holding four-bit queue positions, 58*19c3b8c2SApple OSS Distributions * packed eight per word. 59*19c3b8c2SApple OSS Distributions * 60*19c3b8c2SApple OSS Distributions * 5. a variable-sized LOW BITS AREA (always word aligned and an 61*19c3b8c2SApple OSS Distributions * integral number of words) holding ten-bit low-bit patterns 62*19c3b8c2SApple OSS Distributions * (from partial matches), packed three per word. 63*19c3b8c2SApple OSS Distributions */ 64*19c3b8c2SApple OSS Distributions 65*19c3b8c2SApple OSS Distributions #ifdef __cplusplus 66*19c3b8c2SApple OSS Distributions extern "C" { 67*19c3b8c2SApple OSS Distributions #endif 68*19c3b8c2SApple OSS Distributions 69*19c3b8c2SApple OSS Distributions #include <mach/vm_param.h> 70*19c3b8c2SApple OSS Distributions 71*19c3b8c2SApple OSS Distributions 72*19c3b8c2SApple OSS Distributions #define WKdm_SCRATCH_BUF_SIZE_INTERNAL PAGE_SIZE 73*19c3b8c2SApple OSS Distributions 74*19c3b8c2SApple OSS Distributions typedef unsigned int WK_word; 75*19c3b8c2SApple OSS Distributions 76*19c3b8c2SApple OSS Distributions #if defined(__arm64__) 77*19c3b8c2SApple OSS Distributions 78*19c3b8c2SApple OSS Distributions void 79*19c3b8c2SApple OSS Distributions WKdm_decompress_4k(const WK_word* src_buf, 80*19c3b8c2SApple OSS Distributions WK_word* dest_buf, 81*19c3b8c2SApple OSS Distributions WK_word* scratch, 82*19c3b8c2SApple OSS Distributions unsigned int bytes); 83*19c3b8c2SApple OSS Distributions int 84*19c3b8c2SApple OSS Distributions WKdm_compress_4k(const WK_word* src_buf, 85*19c3b8c2SApple OSS Distributions WK_word* dest_buf, 86*19c3b8c2SApple OSS Distributions WK_word* scratch, 87*19c3b8c2SApple OSS Distributions unsigned int limit); 88*19c3b8c2SApple OSS Distributions 89*19c3b8c2SApple OSS Distributions void 90*19c3b8c2SApple OSS Distributions WKdm_decompress_16k(WK_word* src_buf, 91*19c3b8c2SApple OSS Distributions WK_word* dest_buf, 92*19c3b8c2SApple OSS Distributions WK_word* scratch, 93*19c3b8c2SApple OSS Distributions unsigned int bytes); 94*19c3b8c2SApple OSS Distributions int 95*19c3b8c2SApple OSS Distributions WKdm_compress_16k(WK_word* src_buf, 96*19c3b8c2SApple OSS Distributions WK_word* dest_buf, 97*19c3b8c2SApple OSS Distributions WK_word* scratch, 98*19c3b8c2SApple OSS Distributions unsigned int limit); 99*19c3b8c2SApple OSS Distributions #else 100*19c3b8c2SApple OSS Distributions 101*19c3b8c2SApple OSS Distributions void 102*19c3b8c2SApple OSS Distributions WKdm_decompress_new(WK_word* src_buf, 103*19c3b8c2SApple OSS Distributions WK_word* dest_buf, 104*19c3b8c2SApple OSS Distributions WK_word* scratch, 105*19c3b8c2SApple OSS Distributions unsigned int bytes); 106*19c3b8c2SApple OSS Distributions int 107*19c3b8c2SApple OSS Distributions WKdm_compress_new(const WK_word* src_buf, 108*19c3b8c2SApple OSS Distributions WK_word* dest_buf, 109*19c3b8c2SApple OSS Distributions WK_word* scratch, 110*19c3b8c2SApple OSS Distributions unsigned int limit); 111*19c3b8c2SApple OSS Distributions #endif 112*19c3b8c2SApple OSS Distributions 113*19c3b8c2SApple OSS Distributions #ifdef __cplusplus 114*19c3b8c2SApple OSS Distributions } /* extern "C" */ 115*19c3b8c2SApple OSS Distributions #endif 116