#include changes. --HG-- rename : sim/cache/lzss_compression.cc => base/compression/lzss_compression.cc rename : sim/cache/lzss_compression.hh => base/compression/lzss_compression.hh rename : sim/cache/null_compression.hh => base/compression/null_compression.hh rename : sim/hybrid_pred.cc => base/hybrid_pred.cc rename : sim/hybrid_pred.hh => base/hybrid_pred.hh rename : base/aout_object.cc => base/loader/aout_object.cc rename : base/aout_object.hh => base/loader/aout_object.hh rename : base/coff_sym.h => base/loader/coff_sym.h rename : base/coff_symconst.h => base/loader/coff_symconst.h rename : base/ecoff_object.cc => base/loader/ecoff_object.cc rename : base/ecoff_object.hh => base/loader/ecoff_object.hh rename : base/elf_object.cc => base/loader/elf_object.cc rename : base/elf_object.hh => base/loader/elf_object.hh rename : base/exec_aout.h => base/loader/exec_aout.h rename : base/exec_ecoff.h => base/loader/exec_ecoff.h rename : base/object_file.cc => base/loader/object_file.cc rename : base/object_file.hh => base/loader/object_file.hh rename : base/symtab.cc => base/loader/symtab.cc rename : base/symtab.hh => base/loader/symtab.hh rename : sim/predictor.hh => base/predictor.hh rename : sim/sat_counter.cc => base/sat_counter.cc rename : sim/sat_counter.hh => base/sat_counter.hh rename : sim/base_cpu.cc => cpu/base_cpu.cc rename : sim/base_cpu.hh => cpu/base_cpu.hh rename : sim/exec_context.cc => cpu/exec_context.cc rename : sim/exec_context.hh => cpu/exec_context.hh rename : sim/exetrace.cc => cpu/exetrace.cc rename : sim/exetrace.hh => cpu/exetrace.hh rename : sim/op_class.hh => cpu/full_cpu/op_class.hh rename : sim/smt.hh => cpu/full_cpu/smt.hh rename : sim/inst_seq.hh => cpu/inst_seq.hh rename : sim/intr_control.cc => cpu/intr_control.cc rename : sim/intr_control.hh => cpu/intr_control.hh rename : sim/memtest.cc => cpu/memtest/memtest.cc rename : sim/memtest.hh => cpu/memtest/memtest.hh rename : sim/pc_event.cc => cpu/pc_event.cc rename : sim/pc_event.hh => cpu/pc_event.hh rename : sim/simple_cpu.cc => cpu/simple_cpu/simple_cpu.cc rename : sim/simple_cpu.hh => cpu/simple_cpu/simple_cpu.hh rename : sim/static_inst.cc => cpu/static_inst.cc rename : sim/static_inst.hh => cpu/static_inst.hh extra : convert_revision : 05bd41acb2a424f1a38609fd4ac6df681bb479d6
101 lines
4 KiB
C++
101 lines
4 KiB
C++
/*
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* Copyright (c) 2003 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __LZSS_COMPRESSION_HH__
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#define __LZSS_COMPRESSION_HH__
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/** @file
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* LZSSCompression declarations.
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*/
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#include "host.hh" // for uint8_t
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/**
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* Simple LZSS compression scheme.
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*/
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class LZSSCompression
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{
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/**
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* Finds the longest substrings that start at the given offsets.
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* @param src The source block that we search for substrings.
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* @param front The smaller offset.
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* @param back The larger offset.
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* @param size The size of the source block.
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* @return The size of the longest substring.
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*/
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int findSubString(uint8_t *src, int front, int back, int size);
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/**
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* Emit an encoded byte to the compressed data array. If the 2 high
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* order bits can be signed extended, use 1 byte encoding, if not use 2
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* bytes.
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* @param dest The compressed data.
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* @param byte The byte to emit.
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* @return The number of bytes used to encode.
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*/
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int emitByte(uint8_t *dest, uint8_t byte);
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/**
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* Emit a string reference to the compressed data array. A string reference
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* always uses 3 bytes. 1 flag bit, 12 bits for the starting position, and
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* 11 bits for the length of the string. This allows compression of 4096
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* byte blocks with string lengths of up to 2048 bytes.
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* @param dest The compressed data.
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* @param P The starting position in the uncompressed data.
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* @param L The length in bytes of the string.
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*/
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void emitString(uint8_t *dest, uint16_t P, uint16_t L);
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public:
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/**
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* Compresses the source block and stores it in the destination block. If
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* the compressed block grows to larger than the source block, it aborts
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* and just performs a copy.
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* @param dest The destination block.
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* @param src The block to be compressed.
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* @param size The size of the source block.
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* @return The size of the compressed block.
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*
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* @pre Destination has enough storage to hold the compressed block.
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*/
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int compress(uint8_t *dest, uint8_t *src, int size);
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/**
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* Unompresses the source block and stores it in the destination block.
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* @param dest The destination block.
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* @param src The block to be uncompressed.
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* @param size The size of the source block.
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* @return The size of the uncompressed block.
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*
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* @pre Destination has enough storage to hold the uncompressed block.
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*/
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int uncompress(uint8_t *dest, uint8_t *src, int size);
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};
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#endif //__LZSS_COMPRESSION_HH__
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