comparison: src/bytestream.cpp
src/bytestream.cpp
- changeset 18
- 6bf57b4f42cd
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- b41d74bacdea
- child 19
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| 17:b41d74bacdea | 18:6bf57b4f42cd |
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| 1 /* | |
| 2 * ZanDemo: Zandronum demo launcher | |
| 3 * Copyright (C) 2013 Santeri Piippo | |
| 4 * | |
| 5 * This program is free software: you can redistribute it and/or modify | |
| 6 * it under the terms of the GNU General Public License as published by | |
| 7 * the Free Software Foundation, either version 3 of the License, or | |
| 8 * (at your option) any later version. | |
| 9 * | |
| 10 * This program is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 * GNU General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License | |
| 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 17 */ | |
| 18 | |
| 19 #include "bytestream.h" | |
| 20 #include "misc.h" | |
| 21 #include <string.h> | |
| 22 | |
| 23 union { | |
| 24 uint32 i; | |
| 25 float f; | |
| 26 } g_floatunion; | |
| 27 | |
| 28 Bytestream::Bytestream (ulong len) { | |
| 29 m_data = null; | |
| 30 resize (len); | |
| 31 clear(); | |
| 32 } | |
| 33 | |
| 34 Bytestream::Bytestream (const char* data, ulong len) { | |
| 35 m_data = null; | |
| 36 init (data, len); | |
| 37 } | |
| 38 | |
| 39 void Bytestream::resize (ulong newsize) { | |
| 40 char* olddata = null; | |
| 41 ulong oldsize; | |
| 42 | |
| 43 if (m_data) { | |
| 44 oldsize = m_size; | |
| 45 olddata = new char[oldsize]; | |
| 46 memcpy (olddata, m_data, oldsize); | |
| 47 } | |
| 48 | |
| 49 delete[] m_data; | |
| 50 m_data = new uint8[newsize]; | |
| 51 m_size = newsize; | |
| 52 | |
| 53 if (olddata) | |
| 54 memcpy (m_data, olddata, min<ulong> (oldsize, newsize)); | |
| 55 } | |
| 56 | |
| 57 void Bytestream::init (const char* data, ulong len) { | |
| 58 resize (len); | |
| 59 memcpy (m_data, data, len); | |
| 60 m_ptr = &m_data[0]; | |
| 61 m_len = len; | |
| 62 } | |
| 63 | |
| 64 size_t Bytestream::len() const { | |
| 65 return m_len; | |
| 66 } | |
| 67 | |
| 68 void Bytestream::clear() { | |
| 69 m_ptr = &m_data[0]; | |
| 70 m_len = 0; | |
| 71 } | |
| 72 | |
| 73 uint8& Bytestream::subscript (ulong idx) { | |
| 74 return m_data[idx]; | |
| 75 } | |
| 76 | |
| 77 const uint8& Bytestream::const_subscript (ulong idx) const { | |
| 78 return m_data[idx]; | |
| 79 } | |
| 80 | |
| 81 void Bytestream::seek (ulong pos) { | |
| 82 m_ptr = m_data + pos; | |
| 83 } | |
| 84 | |
| 85 // ============================================================================= | |
| 86 void Bytestream::rewind() { | |
| 87 m_ptr = m_data; | |
| 88 } | |
| 89 | |
| 90 ulong Bytestream::bytesLeft() const { | |
| 91 return (m_len - (m_ptr - &m_data[0])); | |
| 92 } | |
| 93 | |
| 94 ulong Bytestream::spaceLeft() const { | |
| 95 return (m_size - m_len); | |
| 96 } | |
| 97 | |
| 98 // ============================================================================= | |
| 99 bool Bytestream::readByte (uint8& val) { | |
| 100 if (bytesLeft() < 1) | |
| 101 return false; | |
| 102 | |
| 103 val = *m_ptr++; | |
| 104 return true; | |
| 105 } | |
| 106 | |
| 107 // ============================================================================= | |
| 108 bool Bytestream::readShort (uint16& val) { | |
| 109 if (bytesLeft() < 2) | |
| 110 return false; | |
| 111 | |
| 112 val = 0; | |
| 113 | |
| 114 for (int i = 0; i < 2; ++i) | |
| 115 val |= *m_ptr++ << (i * 8); | |
| 116 | |
| 117 return true; | |
| 118 } | |
| 119 | |
| 120 // ============================================================================= | |
| 121 bool Bytestream::readLong (uint32& val) { | |
| 122 if (bytesLeft() < 4) | |
| 123 return false; | |
| 124 | |
| 125 val = 0; | |
| 126 | |
| 127 for (int i = 0; i < 4; ++i) | |
| 128 val |= *m_ptr++ << (i * 8); | |
| 129 | |
| 130 return true; | |
| 131 } | |
| 132 | |
| 133 // ============================================================================= | |
| 134 bool Bytestream::readFloat (float& val) { | |
| 135 if (!readLong (g_floatunion.i)) | |
| 136 return false; | |
| 137 | |
| 138 val = g_floatunion.f; | |
| 139 return true; | |
| 140 } | |
| 141 | |
| 142 // ============================================================================= | |
| 143 bool Bytestream::readString (str& val) { | |
| 144 if (bytesLeft() < 1) // need at least the null terminator | |
| 145 return false; | |
| 146 | |
| 147 uint8_t c; | |
| 148 | |
| 149 while (readByte (c) && c != '\0') | |
| 150 val += (char) c; | |
| 151 | |
| 152 return true; | |
| 153 } | |
| 154 | |
| 155 // ============================================================================= | |
| 156 void Bytestream::doWrite (uint8_t val) { | |
| 157 *m_ptr++ = val; | |
| 158 m_len++; | |
| 159 } | |
| 160 | |
| 161 void Bytestream::growToFit (ulong bytes) { | |
| 162 if (spaceLeft() < bytes) | |
| 163 resize (m_size + bytes + 128); | |
| 164 } | |
| 165 | |
| 166 bool Bytestream::readBytes (uint8 numbytes, uint8* val) { | |
| 167 while (numbytes--) | |
| 168 if (!readByte (*val++)) | |
| 169 return false; | |
| 170 | |
| 171 return true; | |
| 172 } | |
| 173 | |
| 174 void Bytestream::writeBytes (uint8 numbytes, const uint8* val) { | |
| 175 growToFit (numbytes); | |
| 176 | |
| 177 while (numbytes--) | |
| 178 writeByte (*val++); | |
| 179 } | |
| 180 | |
| 181 // ============================================================================= | |
| 182 void Bytestream::writeByte (uint8 val) { | |
| 183 growToFit (1); | |
| 184 doWrite (val); | |
| 185 } | |
| 186 | |
| 187 // ============================================================================= | |
| 188 void Bytestream::writeShort (uint16 val) { | |
| 189 growToFit (2); | |
| 190 | |
| 191 for (int i = 0; i < 2; ++i) | |
| 192 doWrite ( (val >> (i * 8)) & 0xFF); | |
| 193 } | |
| 194 | |
| 195 // ============================================================================= | |
| 196 void Bytestream::writeLong (uint32 val) { | |
| 197 growToFit (4); | |
| 198 | |
| 199 for (int i = 0; i < 4; ++i) | |
| 200 doWrite ( (val >> (i * 8)) & 0xFF); | |
| 201 } | |
| 202 | |
| 203 // ============================================================================= | |
| 204 void Bytestream::writeFloat (float val) { | |
| 205 g_floatunion.f = val; | |
| 206 writeLong (g_floatunion.i); | |
| 207 } | |
| 208 | |
| 209 // ============================================================================= | |
| 210 void Bytestream::writeString (str val) { | |
| 211 growToFit (val.length() + 1); | |
| 212 | |
| 213 for (qchar c : val) | |
| 214 doWrite (c.toLatin1()); | |
| 215 | |
| 216 doWrite ('\0'); | |
| 217 } | |
| 218 | |
| 219 // ============================================================================= | |
| 220 bool Bytestream::tryMerge (const Bytestream& other) { | |
| 221 if (spaceLeft() < other.len()) | |
| 222 return false; | |
| 223 | |
| 224 for (ulong i = 0; i < other.len(); ++i) | |
| 225 writeByte (other[i]); | |
| 226 | |
| 227 return true; | |
| 228 } | |
| 229 | |
| 230 void Bytestream::merge (const Bytestream& other) { | |
| 231 growToFit (other.len()); | |
| 232 | |
| 233 if (!tryMerge (other)) { | |
| 234 // Shouldn't happen | |
| 235 fprint (stderr, "ByteStream: Not enough space for merge (%1 bytes left, need %2)", | |
| 236 spaceLeft(), other.len()); | |
| 237 abort(); | |
| 238 } | |
| 239 } | |
| 240 | |
| 241 const uint8* Bytestream::data() const { | |
| 242 return m_data; | |
| 243 } |
