comparison: src/DataBuffer.cc
src/DataBuffer.cc
- changeset 88
- 5def6ff8b466
- child 90
- 90ab2f2b3dc0
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| 87:8f65914e7046 | 88:5def6ff8b466 |
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| 1 /* | |
| 2 Copyright 2012-2014 Santeri Piippo | |
| 3 All rights reserved. | |
| 4 | |
| 5 Redistribution and use in source and binary forms, with or without | |
| 6 modification, are permitted provided that the following conditions | |
| 7 are met: | |
| 8 | |
| 9 1. Redistributions of source code must retain the above copyright | |
| 10 notice, this list of conditions and the following disclaimer. | |
| 11 2. Redistributions in binary form must reproduce the above copyright | |
| 12 notice, this list of conditions and the following disclaimer in the | |
| 13 documentation and/or other materials provided with the distribution. | |
| 14 3. The name of the author may not be used to endorse or promote products | |
| 15 derived from this software without specific prior written permission. | |
| 16 | |
| 17 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
| 18 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
| 19 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
| 20 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
| 21 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 22 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 23 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 24 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 26 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 */ | |
| 28 | |
| 29 #include "DataBuffer.h" | |
| 30 | |
| 31 // ============================================================================ | |
| 32 // | |
| 33 DataBuffer::DataBuffer (int size) | |
| 34 { | |
| 35 SetBuffer (new byte[size]); | |
| 36 SetPosition (&GetBuffer()[0]); | |
| 37 SetAllocatedSize (size); | |
| 38 } | |
| 39 | |
| 40 // ============================================================================ | |
| 41 // | |
| 42 DataBuffer::~DataBuffer() | |
| 43 { | |
| 44 assert (CountMarks() == 0 && CountReferences() == 0); | |
| 45 delete GetBuffer(); | |
| 46 } | |
| 47 | |
| 48 // ============================================================================ | |
| 49 // | |
| 50 void DataBuffer::MergeAndDestroy (DataBuffer* other) | |
| 51 { | |
| 52 if (!other) | |
| 53 return; | |
| 54 | |
| 55 int oldsize = GetWrittenSize(); | |
| 56 CopyBuffer (other); | |
| 57 | |
| 58 // Assimilate in its marks and references | |
| 59 for (ByteMark* mark : other->GetMarks()) | |
| 60 { | |
| 61 mark->pos += oldsize; | |
| 62 PushToMarks (mark); | |
| 63 } | |
| 64 | |
| 65 for (MarkReference* ref : other->GetReferences()) | |
| 66 { | |
| 67 ref->pos += oldsize; | |
| 68 PushToReferences (ref); | |
| 69 } | |
| 70 | |
| 71 ClearMarks(); | |
| 72 ClearReferences(); | |
| 73 delete other; | |
| 74 } | |
| 75 | |
| 76 // ============================================================================ | |
| 77 // | |
| 78 DataBuffer* DataBuffer::Clone() | |
| 79 { | |
| 80 DataBuffer* other = new DataBuffer; | |
| 81 other->CopyBuffer (this); | |
| 82 return other; | |
| 83 } | |
| 84 | |
| 85 // ============================================================================ | |
| 86 // | |
| 87 void DataBuffer::CopyBuffer (const DataBuffer* buf) | |
| 88 { | |
| 89 CheckSpace (buf->GetWrittenSize()); | |
| 90 memcpy (mPosition, buf->GetBuffer(), buf->GetWrittenSize()); | |
| 91 mPosition += buf->GetWrittenSize(); | |
| 92 } | |
| 93 | |
| 94 // ============================================================================ | |
| 95 // | |
| 96 ByteMark* DataBuffer::AddMark (String name) | |
| 97 { | |
| 98 ByteMark* mark = new ByteMark; | |
| 99 mark->name = name; | |
| 100 mark->pos = GetWrittenSize(); | |
| 101 PushToMarks (mark); | |
| 102 return mark; | |
| 103 } | |
| 104 | |
| 105 // ============================================================================ | |
| 106 // | |
| 107 MarkReference* DataBuffer::AddReference (ByteMark* mark, bool writePlaceholder) | |
| 108 { | |
| 109 MarkReference* ref = new MarkReference; | |
| 110 ref->target = mark; | |
| 111 ref->pos = GetWrittenSize(); | |
| 112 PushToReferences (ref); | |
| 113 | |
| 114 // Write a dummy placeholder for the reference | |
| 115 if (writePlaceholder) | |
| 116 WriteDWord (0xBEEFCAFE); | |
| 117 | |
| 118 return ref; | |
| 119 } | |
| 120 | |
| 121 // ============================================================================ | |
| 122 // | |
| 123 void DataBuffer::AdjustMark (ByteMark* mark) | |
| 124 { | |
| 125 mark->pos = GetWrittenSize(); | |
| 126 } | |
| 127 | |
| 128 // ============================================================================ | |
| 129 // | |
| 130 void DataBuffer::OffsetMark (ByteMark* mark, int offset) | |
| 131 { | |
| 132 mark->pos += offset; | |
| 133 } | |
| 134 | |
| 135 // ============================================================================ | |
| 136 // | |
| 137 void DataBuffer::WriteFloat (float a) | |
| 138 { | |
| 139 // TODO: Find a way to store the number without decimal loss. | |
| 140 WriteDWord (dhPushNumber); | |
| 141 WriteDWord (abs (a)); | |
| 142 | |
| 143 if (a < 0) | |
| 144 WriteDWord (dhUnaryMinus); | |
| 145 } | |
| 146 | |
| 147 // ============================================================================ | |
| 148 // | |
| 149 void DataBuffer::WriteStringIndex (const String& a) | |
| 150 { | |
| 151 WriteDWord (dhPushStringIndex); | |
| 152 WriteDWord (GetStringTableIndex (a)); | |
| 153 } | |
| 154 | |
| 155 // ============================================================================ | |
| 156 // | |
| 157 void DataBuffer::Dump() | |
| 158 { | |
| 159 for (int i = 0; i < GetWrittenSize(); ++i) | |
| 160 printf ("%d. [0x%X]\n", i, GetBuffer()[i]); | |
| 161 } | |
| 162 | |
| 163 // ============================================================================ | |
| 164 // | |
| 165 void DataBuffer::CheckSpace (int bytes) | |
| 166 { | |
| 167 int writesize = GetWrittenSize(); | |
| 168 | |
| 169 if (writesize + bytes < GetAllocatedSize()) | |
| 170 return; | |
| 171 | |
| 172 // We don't have enough space in the buffer to write | |
| 173 // the stuff - thus resize. First, store the old | |
| 174 // buffer temporarily: | |
| 175 char* copy = new char[GetAllocatedSize()]; | |
| 176 memcpy (copy, GetBuffer(), GetAllocatedSize()); | |
| 177 | |
| 178 // Remake the buffer with the new size. Have enough space | |
| 179 // for the stuff we're going to write, as well as a bit | |
| 180 // of leeway so we don't have to resize immediately again. | |
| 181 int newsize = GetAllocatedSize() + bytes + 512; | |
| 182 | |
| 183 delete GetBuffer(); | |
| 184 SetBuffer (new byte[newsize]); | |
| 185 SetAllocatedSize (newsize); | |
| 186 | |
| 187 // Now, copy the stuff back. | |
| 188 memcpy (mBuffer, copy, GetAllocatedSize()); | |
| 189 SetPosition (GetBuffer() + writesize); | |
| 190 delete copy; | |
| 191 } | |
| 192 | |
| 193 // ============================================================================= | |
| 194 // | |
| 195 void DataBuffer::WriteByte (int8_t data) | |
| 196 { | |
| 197 CheckSpace (1); | |
| 198 *mPosition++ = data; | |
| 199 } | |
| 200 | |
| 201 // ============================================================================= | |
| 202 // | |
| 203 void DataBuffer::WriteWord (int16_t data) | |
| 204 { | |
| 205 CheckSpace (2); | |
| 206 | |
| 207 for (int i = 0; i < 2; ++i) | |
| 208 *mPosition++ = (data >> (i * 8)) & 0xFF; | |
| 209 } | |
| 210 | |
| 211 // ============================================================================= | |
| 212 // | |
| 213 void DataBuffer::WriteDWord (int32_t data) | |
| 214 { | |
| 215 CheckSpace (4); | |
| 216 | |
| 217 for (int i = 0; i < 4; ++i) | |
| 218 *mPosition++ = (data >> (i * 8)) & 0xFF; | |
| 219 } | |
| 220 | |
| 221 // ============================================================================= | |
| 222 // | |
| 223 void DataBuffer::WriteString (const String& a) | |
| 224 { | |
| 225 CheckSpace (a.Length() + 1); | |
| 226 | |
| 227 for (char c : a) | |
| 228 WriteByte (c); | |
| 229 | |
| 230 WriteByte ('\0'); | |
| 231 } | |
| 232 | |
| 233 | |
| 234 // ============================================================================= | |
| 235 // | |
| 236 ByteMark* DataBuffer::FindMarkByName (const String& target) | |
| 237 { | |
| 238 for (ByteMark* mark : GetMarks()) | |
| 239 if (mark->name == target) | |
| 240 return mark; | |
| 241 | |
| 242 return null; | |
| 243 } |
