arch/alpha/alpha_memory.cc: arch/alpha/alpha_memory.hh: arch/alpha/arguments.cc: arch/alpha/arguments.hh: arch/alpha/ev5.cc: arch/alpha/ev5.hh: arch/alpha/fake_syscall.cc: arch/alpha/faults.cc: arch/alpha/isa_desc: arch/alpha/isa_traits.hh: arch/alpha/osfpal.cc: arch/alpha/vtophys.cc: arch/alpha/vtophys.hh: base/circlebuf.cc: base/compression/lzss_compression.cc: base/compression/lzss_compression.hh: base/cprintf.cc: base/cprintf.hh: base/fast_alloc.cc: base/fifo_buffer.cc: base/fifo_buffer.hh: base/hashmap.hh: base/hostinfo.cc: base/hostinfo.hh: base/hybrid_pred.cc: base/hybrid_pred.hh: base/inet.cc: base/inet.hh: base/inifile.cc: base/inifile.hh: base/intmath.cc: base/loader/aout_object.cc: base/loader/aout_object.hh: base/loader/ecoff_object.cc: base/loader/ecoff_object.hh: base/loader/elf_object.cc: base/loader/elf_object.hh: base/loader/exec_aout.h: base/loader/exec_ecoff.h: base/loader/object_file.cc: base/loader/object_file.hh: base/loader/symtab.cc: base/loader/symtab.hh: base/misc.cc: base/misc.hh: base/pollevent.cc: base/pollevent.hh: base/random.cc: base/random.hh: base/range.hh: base/remote_gdb.cc: base/remote_gdb.hh: base/res_list.hh: base/sat_counter.cc: base/sat_counter.hh: base/sched_list.hh: base/socket.cc: base/statistics.cc: base/statistics.hh: base/str.cc: base/trace.cc: base/trace.hh: cpu/base_cpu.cc: cpu/base_cpu.hh: cpu/exec_context.cc: cpu/exec_context.hh: cpu/exetrace.cc: cpu/exetrace.hh: cpu/intr_control.cc: cpu/intr_control.hh: cpu/memtest/memtest.cc: cpu/memtest/memtest.hh: cpu/pc_event.cc: cpu/pc_event.hh: cpu/simple_cpu/simple_cpu.cc: cpu/simple_cpu/simple_cpu.hh: cpu/static_inst.cc: cpu/static_inst.hh: dev/alpha_console.cc: dev/alpha_console.hh: dev/console.cc: dev/console.hh: dev/disk_image.cc: dev/disk_image.hh: dev/etherbus.cc: dev/etherbus.hh: dev/etherdump.cc: dev/etherdump.hh: dev/etherint.cc: dev/etherint.hh: dev/etherlink.cc: dev/etherlink.hh: dev/etherpkt.hh: dev/ethertap.cc: dev/ethertap.hh: dev/simple_disk.cc: dev/simple_disk.hh: kern/tru64/tru64_syscalls.cc: kern/tru64/tru64_syscalls.hh: sim/debug.cc: sim/eventq.cc: sim/eventq.hh: sim/main.cc: sim/param.cc: sim/param.hh: sim/prog.cc: sim/prog.hh: sim/serialize.cc: sim/serialize.hh: sim/sim_events.cc: sim/sim_events.hh: sim/sim_object.cc: sim/sim_object.hh: sim/sim_time.cc: sim/system.cc: sim/system.hh: sim/universe.cc: test/circletest.cc: test/cprintftest.cc: test/initest.cc: test/nmtest.cc: test/offtest.cc: test/paramtest.cc: test/rangetest.cc: test/stattest.cc: test/strnumtest.cc: test/symtest.cc: test/tokentest.cc: test/tracetest.cc: util/tap/tap.cc: Make include paths explicit. --HG-- extra : convert_revision : 941cbdc591fd4d3d1d9f095cd58fc23dd2d73840
100 lines
4 KiB
C++
100 lines
4 KiB
C++
/*
|
|
* Copyright (c) 2003 The Regents of The University of Michigan
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met: redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer;
|
|
* redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution;
|
|
* neither the name of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef __LZSS_COMPRESSION_HH__
|
|
#define __LZSS_COMPRESSION_HH__
|
|
|
|
/** @file
|
|
* LZSSCompression declarations.
|
|
*/
|
|
|
|
#include "sim/host.hh" // for uint8_t
|
|
|
|
/**
|
|
* Simple LZSS compression scheme.
|
|
*/
|
|
class LZSSCompression
|
|
{
|
|
/**
|
|
* Finds the longest substrings that start at the given offsets.
|
|
* @param src The source block that we search for substrings.
|
|
* @param front The smaller offset.
|
|
* @param back The larger offset.
|
|
* @param size The size of the source block.
|
|
* @return The size of the longest substring.
|
|
*/
|
|
int findSubString(uint8_t *src, int front, int back, int size);
|
|
|
|
/**
|
|
* Emit an encoded byte to the compressed data array. If the 2 high
|
|
* order bits can be signed extended, use 1 byte encoding, if not use 2
|
|
* bytes.
|
|
* @param dest The compressed data.
|
|
* @param byte The byte to emit.
|
|
* @return The number of bytes used to encode.
|
|
*/
|
|
int emitByte(uint8_t *dest, uint8_t byte);
|
|
|
|
/**
|
|
* Emit a string reference to the compressed data array. A string reference
|
|
* always uses 3 bytes. 1 flag bit, 12 bits for the starting position, and
|
|
* 11 bits for the length of the string. This allows compression of 4096
|
|
* byte blocks with string lengths of up to 2048 bytes.
|
|
* @param dest The compressed data.
|
|
* @param P The starting position in the uncompressed data.
|
|
* @param L The length in bytes of the string.
|
|
*/
|
|
void emitString(uint8_t *dest, uint16_t P, uint16_t L);
|
|
|
|
public:
|
|
/**
|
|
* Compresses the source block and stores it in the destination block. If
|
|
* the compressed block grows to larger than the source block, it aborts
|
|
* and just performs a copy.
|
|
* @param dest The destination block.
|
|
* @param src The block to be compressed.
|
|
* @param size The size of the source block.
|
|
* @return The size of the compressed block.
|
|
*
|
|
* @pre Destination has enough storage to hold the compressed block.
|
|
*/
|
|
int compress(uint8_t *dest, uint8_t *src, int size);
|
|
|
|
/**
|
|
* Unompresses the source block and stores it in the destination block.
|
|
* @param dest The destination block.
|
|
* @param src The block to be uncompressed.
|
|
* @param size The size of the source block.
|
|
* @return The size of the uncompressed block.
|
|
*
|
|
* @pre Destination has enough storage to hold the uncompressed block.
|
|
*/
|
|
int uncompress(uint8_t *dest, uint8_t *src, int size);
|
|
};
|
|
|
|
#endif //__LZSS_COMPRESSION_HH__
|