comparison: sources/network/bytestream.cpp
sources/network/bytestream.cpp
- changeset 5
- 146825d63b9a
- child 9
- e7a09ceb4505
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| 4:ec5387e121fa | 5:146825d63b9a |
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| 1 #include "bytestream.h" | |
| 2 #include <string.h> | |
| 3 | |
| 4 bool Bytestream::sink; | |
| 5 | |
| 6 // ------------------------------------------------------------------------------------------------- | |
| 7 // | |
| 8 Bytestream::Bytestream (unsigned long length) : | |
| 9 m_data (nullptr) | |
| 10 { | |
| 11 resize (length); | |
| 12 clear(); | |
| 13 } | |
| 14 | |
| 15 // ------------------------------------------------------------------------------------------------- | |
| 16 // | |
| 17 Bytestream::Bytestream (const unsigned char* data, unsigned long length) : | |
| 18 m_data (nullptr) | |
| 19 { | |
| 20 m_data = nullptr; | |
| 21 init (data, length); | |
| 22 } | |
| 23 | |
| 24 // ------------------------------------------------------------------------------------------------- | |
| 25 // | |
| 26 Bytestream::Bytestream (const Vector<unsigned char>& bytes) : | |
| 27 m_data (nullptr) | |
| 28 { | |
| 29 init (bytes.data(), bytes.size()); | |
| 30 } | |
| 31 | |
| 32 // ------------------------------------------------------------------------------------------------- | |
| 33 // | |
| 34 Bytestream::~Bytestream() | |
| 35 { | |
| 36 delete m_data; | |
| 37 } | |
| 38 | |
| 39 // ------------------------------------------------------------------------------------------------- | |
| 40 // | |
| 41 void Bytestream::resize (unsigned long newsize) | |
| 42 { | |
| 43 Vector<unsigned char> olddata; | |
| 44 unsigned long oldsize = 0L; | |
| 45 | |
| 46 if (m_data != nullptr) | |
| 47 { | |
| 48 oldsize = allocated_size(); | |
| 49 olddata.resize (oldsize); | |
| 50 memcpy (olddata.data(), m_data, oldsize); | |
| 51 } | |
| 52 | |
| 53 delete[] m_data; | |
| 54 m_allocatedSize = newsize; | |
| 55 m_data = new unsigned char[newsize]; | |
| 56 | |
| 57 if (olddata > 0L) | |
| 58 memcpy (m_data, olddata, min (oldsize, newsize)); | |
| 59 } | |
| 60 | |
| 61 // ------------------------------------------------------------------------------------------------- | |
| 62 // | |
| 63 void Bytestream::init (const unsigned char* data, unsigned long length) | |
| 64 { | |
| 65 resize (length); | |
| 66 memcpy (m_data, data, length); | |
| 67 m_cursor = &m_data[0]; | |
| 68 m_writtenLength = length; | |
| 69 } | |
| 70 | |
| 71 // ------------------------------------------------------------------------------------------------- | |
| 72 // | |
| 73 void Bytestream::clear() | |
| 74 { | |
| 75 m_cursor = &m_data[0]; | |
| 76 m_writtenLength = 0; | |
| 77 } | |
| 78 | |
| 79 // ------------------------------------------------------------------------------------------------- | |
| 80 // | |
| 81 char Bytestream::read_byte (bool* ok) | |
| 82 { | |
| 83 *ok = bytes_left() > 0; | |
| 84 return *ok ? *m_cursor++ : -1; | |
| 85 } | |
| 86 | |
| 87 // ------------------------------------------------------------------------------------------------- | |
| 88 // | |
| 89 short int Bytestream::read_short (bool* ok) | |
| 90 { | |
| 91 if (bytes_left() < 2) | |
| 92 { | |
| 93 *ok = false; | |
| 94 return false; | |
| 95 } | |
| 96 | |
| 97 short int val = 0; | |
| 98 | |
| 99 for (int i = 0; i < 2; ++i) | |
| 100 val |= *m_cursor++ << (i * 8); | |
| 101 | |
| 102 *ok = true; | |
| 103 return true; | |
| 104 } | |
| 105 | |
| 106 // ------------------------------------------------------------------------------------------------- | |
| 107 // | |
| 108 long int Bytestream::read_long (bool* ok) | |
| 109 { | |
| 110 if (bytes_left() < 4) | |
| 111 { | |
| 112 *ok = false; | |
| 113 return -1; | |
| 114 } | |
| 115 | |
| 116 long int val = 0; | |
| 117 | |
| 118 for (int i = 0; i < 4; ++i) | |
| 119 val |= *m_cursor++ << (i * 8); | |
| 120 | |
| 121 *ok = true; | |
| 122 return val; | |
| 123 } | |
| 124 | |
| 125 // ------------------------------------------------------------------------------------------------- | |
| 126 // | |
| 127 float Bytestream::read_float (bool* ok) | |
| 128 { | |
| 129 int value = read_long (ok); | |
| 130 | |
| 131 if (*ok == false) | |
| 132 return -1.0f; | |
| 133 | |
| 134 return reinterpret_cast<float&> (value); | |
| 135 } | |
| 136 | |
| 137 // ------------------------------------------------------------------------------------------------- | |
| 138 // | |
| 139 String Bytestream::read_string (bool* ok) | |
| 140 { | |
| 141 // Zandronum sends strings of maximum 2048 characters, though it only | |
| 142 // reads 2047-character long ones so I guess we can follow up and do | |
| 143 // the same :-) | |
| 144 static char buffer[MAX_NETWORK_STRING]; | |
| 145 unsigned char* stringEnd; | |
| 146 unsigned char* stringBegin = m_cursor; | |
| 147 unsigned char* end = m_data + allocated_size(); | |
| 148 | |
| 149 // where's the end of the string? | |
| 150 for (stringEnd = m_cursor; *stringEnd != '\0'; ++stringEnd) | |
| 151 { | |
| 152 if (stringEnd == end) | |
| 153 { | |
| 154 // past the end of the buffer! Argh! | |
| 155 *ok = false; | |
| 156 return ""; | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 m_cursor = stringEnd + 1; | |
| 161 *ok = true; | |
| 162 unsigned int length = stringEnd - m_cursor; | |
| 163 | |
| 164 // ensure we won't write past the buffer (note: we still moved | |
| 165 // past the excess bytes in the above statement, those are ignored) | |
| 166 if (length >= MAX_NETWORK_STRING) | |
| 167 length = MAX_NETWORK_STRING - 1; | |
| 168 | |
| 169 memcpy (buffer, stringBegin, length); | |
| 170 buffer[length] = '\0'; | |
| 171 return String (buffer); | |
| 172 } | |
| 173 | |
| 174 // ------------------------------------------------------------------------------------------------- | |
| 175 // | |
| 176 METHOD | |
| 177 Bytestream::read (unsigned char* buffer, unsigned long length, bool* ok) -> void | |
| 178 { | |
| 179 if (bytes_left() < length) | |
| 180 { | |
| 181 *ok = false; | |
| 182 return; | |
| 183 } | |
| 184 | |
| 185 memcpy (buffer, m_cursor, length); | |
| 186 m_cursor += length; | |
| 187 *ok = true; | |
| 188 } | |
| 189 | |
| 190 // ------------------------------------------------------------------------------------------------- | |
| 191 // | |
| 192 void Bytestream::write (unsigned char val) | |
| 193 { | |
| 194 *m_cursor++ = val; | |
| 195 m_writtenLength++; | |
| 196 } | |
| 197 | |
| 198 // ------------------------------------------------------------------------------------------------- | |
| 199 // | |
| 200 void Bytestream::write (const unsigned char* val, unsigned int length) | |
| 201 { | |
| 202 grow_to_fit (length); | |
| 203 memcpy (m_cursor, val, length); | |
| 204 m_cursor += length; | |
| 205 m_writtenLength += length; | |
| 206 } | |
| 207 | |
| 208 // ------------------------------------------------------------------------------------------------- | |
| 209 // | |
| 210 void Bytestream::grow_to_fit (unsigned long bytes) | |
| 211 { | |
| 212 if (space_left() < bytes) | |
| 213 resize (allocated_size() + bytes + 128); | |
| 214 } | |
| 215 | |
| 216 // ------------------------------------------------------------------------------------------------- | |
| 217 // | |
| 218 void Bytestream::write_byte (char val) | |
| 219 { | |
| 220 grow_to_fit (1); | |
| 221 write (val); | |
| 222 } | |
| 223 | |
| 224 // ------------------------------------------------------------------------------------------------- | |
| 225 // | |
| 226 void Bytestream::write_short (short int val) | |
| 227 { | |
| 228 grow_to_fit (2); | |
| 229 | |
| 230 for (int i = 0; i < 2; ++i) | |
| 231 write ((val >> (i * 8)) & 0xFF); | |
| 232 } | |
| 233 | |
| 234 // ------------------------------------------------------------------------------------------------- | |
| 235 // | |
| 236 void Bytestream::write_long (long int val) | |
| 237 { | |
| 238 grow_to_fit (4); | |
| 239 | |
| 240 for (int i = 0; i < 4; ++i) | |
| 241 write ((val >> (i * 8)) & 0xFF); | |
| 242 } | |
| 243 | |
| 244 // ------------------------------------------------------------------------------------------------- | |
| 245 // | |
| 246 void Bytestream::write_float (float val) | |
| 247 { | |
| 248 // I know this is probably dangerous but this is what Zandronum does so yeah | |
| 249 write_long (reinterpret_cast<int&> (val)); | |
| 250 } | |
| 251 | |
| 252 // ------------------------------------------------------------------------------------------------- | |
| 253 // | |
| 254 void Bytestream::write_string (const String& val) | |
| 255 { | |
| 256 grow_to_fit (val.length() + 1); | |
| 257 write (reinterpret_cast<const unsigned char*> (val.chars()), val.length()); | |
| 258 write (0); | |
| 259 } | |
| 260 | |
| 261 // ------------------------------------------------------------------------------------------------- | |
| 262 // | |
| 263 void Bytestream::write_buffer (const Bytestream& other) | |
| 264 { | |
| 265 write (other.data(), other.written_length()); | |
| 266 } |
