00001 /* 00002 * IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. By 00003 * downloading, copying, installing or using the software you agree to 00004 * this license. If you do not agree to this license, do not download, 00005 * install, copy or use the software. 00006 * 00007 * Intel Open Source License 00008 * 00009 * Copyright (c) 2004 Intel Corporation. All rights reserved. 00010 * 00011 * Redistribution and use in source and binary forms, with or without 00012 * modification, are permitted provided that the following conditions are 00013 * met: 00014 * 00015 * Redistributions of source code must retain the above copyright 00016 * notice, this list of conditions and the following disclaimer. 00017 * 00018 * Redistributions in binary form must reproduce the above copyright 00019 * notice, this list of conditions and the following disclaimer in the 00020 * documentation and/or other materials provided with the distribution. 00021 * 00022 * Neither the name of the Intel Corporation nor the names of its 00023 * contributors may be used to endorse or promote products derived from 00024 * this software without specific prior written permission. 00025 * 00026 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00027 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00028 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00029 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE INTEL OR 00030 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00031 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00032 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00033 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00034 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00035 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00036 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00037 */ 00038 00039 #include <string.h> 00040 #include "debug/DebugUtils.h" 00041 #include "debug/Log.h" 00042 #include "StreamBuffer.h" 00043 00044 namespace oasys { 00045 00046 /*************************************************************************** 00047 * 00048 * StreamBuffer 00049 * 00050 **************************************************************************/ 00051 StreamBuffer::StreamBuffer(size_t size) : 00052 start_(0), end_(0), size_(size) 00053 { 00054 if(size_ == 0) 00055 size_ = 4; 00056 00057 buf_ = static_cast<char*>(malloc(size_)); 00058 ASSERT(buf_); 00059 } 00060 00061 StreamBuffer::~StreamBuffer() 00062 { 00063 if(buf_) 00064 { 00065 free(buf_); 00066 buf_ = 0; 00067 } 00068 } 00069 00070 void 00071 StreamBuffer::set_size(size_t size) 00072 { 00073 ASSERT(fullbytes() <= size); 00074 moveup(); 00075 00076 realloc(size); 00077 } 00078 00079 char* 00080 StreamBuffer::start() 00081 { 00082 return &buf_[start_]; 00083 } 00084 00085 char* 00086 StreamBuffer::end() 00087 { 00088 return &buf_[end_]; 00089 } 00090 00091 void 00092 StreamBuffer::reserve(size_t amount) 00093 { 00094 if (amount <= tailbytes()) 00095 { 00096 // do nothing 00097 } 00098 else if(amount <= start_) 00099 { 00100 moveup(); 00101 } 00102 else 00103 { 00104 moveup(); 00105 realloc(((amount + fullbytes())> size_*2) ? 00106 (amount + fullbytes()): (size_*2)); 00107 } 00108 } 00109 00110 void 00111 StreamBuffer::fill(size_t amount) 00112 { 00113 ASSERT(amount <= tailbytes()); 00114 00115 end_ += amount; 00116 } 00117 00118 void 00119 StreamBuffer::consume(size_t amount) 00120 { 00121 ASSERT(amount <= fullbytes()); 00122 00123 start_ += amount; 00124 if(start_ == end_) 00125 { 00126 start_ = end_ = 0; 00127 } 00128 } 00129 00130 void 00131 StreamBuffer::clear() 00132 { 00133 start_ = end_ = 0; 00134 } 00135 00136 size_t 00137 StreamBuffer::fullbytes() 00138 { 00139 return end_ - start_; 00140 } 00141 00142 size_t 00143 StreamBuffer::tailbytes() 00144 { 00145 return size_ - end_; 00146 } 00147 00148 void 00149 StreamBuffer::realloc(size_t size) 00150 { 00151 buf_ = (char*)::realloc(buf_, size); 00152 if(buf_ == 0) 00153 { 00154 logf("/StreamBuffer", LOG_CRIT, "Out of memory"); 00155 ASSERT(0); 00156 } 00157 00158 size_ = size; 00159 } 00160 00161 void 00162 StreamBuffer::moveup() 00163 { 00164 memmove(&buf_[0], &buf_[start_], end_ - start_); 00165 end_ = end_ - start_; 00166 start_ = 0; 00167 } 00168 00169 } // namespace oasys