author | terom |
Mon, 22 Dec 2008 02:37:43 +0000 | |
changeset 387 | 294ce7ae8140 |
parent 365 | 65295dfbbf64 |
child 391 | 59c2499fe7bb |
permissions | -rw-r--r-- |
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#include <cassert> |
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#include <cstring> |
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#include "Packet.hh" |
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// XXX: assumes that sizeof(float32) == sizeof(int32); |
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/* |
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* NetworkPacketInput |
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*/ |
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template <typename T> T NetworkPacketInput::read_val (void) { |
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T val; |
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// read |
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read(&val, sizeof(T)); |
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// return |
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return val; |
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} |
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uint32_t NetworkPacketInput::read_uint32 (void) { |
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return ntohl(read_val<uint32_t>()); |
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} |
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uint16_t NetworkPacketInput::read_uint16 (void) { |
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return ntohs(read_val<uint16_t>()); |
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} |
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uint8_t NetworkPacketInput::read_uint8 (void) { |
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return read_val<uint8_t>(); |
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} |
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int32_t NetworkPacketInput::read_int32 (void) { |
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return ntohl(read_val<int32_t>()); |
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} |
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int16_t NetworkPacketInput::read_int16 (void) { |
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return ntohs(read_val<int16_t>()); |
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} |
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int8_t NetworkPacketInput::read_int8 (void) { |
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return read_val<int8_t>(); |
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} |
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float NetworkPacketInput::read_float32 (void) { |
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int32_t ival = read_int32(); |
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float fval; |
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assert(sizeof(ival) == sizeof(fval)); |
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memcpy(&fval, &ival, sizeof(float)); |
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return fval; |
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} |
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Vector NetworkPacketInput::read_vector (void) { |
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float fx = read_float32(); |
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float fy = read_float32(); |
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return Vector(fx, fy); |
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} |
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/* |
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* NetworkPacketOutput |
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*/ |
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template <typename T> void NetworkPacketOutput::write_val (const T &val) { |
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// write |
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write(&val, sizeof(T)); |
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} |
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void NetworkPacketOutput::write_uint32 (uint32_t val) { |
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write_val<uint32_t>(htonl(val)); |
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} |
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void NetworkPacketOutput::write_uint16 (uint16_t val) { |
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write_val<uint16_t>(htons(val)); |
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} |
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void NetworkPacketOutput::write_uint8 (uint8_t val) { |
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write_val<uint8_t>(val); |
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} |
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void NetworkPacketOutput::write_int32 (int32_t val) { |
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write_val<int32_t>(htonl(val)); |
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} |
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void NetworkPacketOutput::write_int16 (int16_t val) { |
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write_val<int16_t>(htons(val)); |
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} |
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void NetworkPacketOutput::write_int8 (int8_t val) { |
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write_val<int8_t>(val); |
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} |
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void NetworkPacketOutput::write_float32 (float fval) { |
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int32_t ival; |
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assert(sizeof(ival) == sizeof(fval)); |
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memcpy(&ival, &fval, sizeof(int32_t)); |
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write_int32(ival); |
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} |
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void NetworkPacketOutput::write_vector (const Vector &vec) { |
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write_float32(vec.x); |
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write_float32(vec.y); |
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} |
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void NetworkPacketOutput::write_packet (const NetworkPacketBuffer &pkt) { |
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// just write() it |
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write(pkt.get_buf(), pkt.get_data_size()); |
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} |
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/* |
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* NetworkPacketBuffer |
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*/ |
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NetworkPacketBuffer::NetworkPacketBuffer (char *buf_ptr, size_t buf_size, size_t data_size) : |
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buf_ptr(buf_ptr), buf_size(buf_size), data_size(data_size), offset(0) { |
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// nothing |
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if (buf_ptr == NULL) |
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throw NetworkPacketError("buf_ptr may not be NULL"); |
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} |
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void NetworkPacketBuffer::check_write_size (size_t item_size) { |
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if (offset + item_size > buf_size) |
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throw NetworkPacketError("not enough space to write"); |
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} |
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void NetworkPacketBuffer::check_read_size (size_t item_size) { |
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if (offset + item_size > data_size) |
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throw NetworkPacketError("not enough data to read"); |
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} |
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const void* NetworkPacketBuffer::read_ptr (size_t len) { |
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// check buffer overflow |
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check_write_size(len); |
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// pointer value... |
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const void *ptr = buf_ptr + offset; |
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// update offset |
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offset += len; |
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// return pointer |
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return ptr; |
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} |
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void* NetworkPacketBuffer::write_ptr (size_t len) { |
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// check buffer overflow |
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check_write_size(len); |
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// pointer value... |
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void *ptr = buf_ptr + offset; |
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// update offset and size |
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offset += len; |
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data_size += len; |
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// return pointer |
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return ptr; |
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} |
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void NetworkPacketBuffer::read (void *ptr, size_t len) { |
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// get input pointer... |
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const void *input_ptr = read_ptr(len); |
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// copy value out |
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memcpy(ptr, input_ptr, len); |
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} |
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void NetworkPacketBuffer::write (const void *ptr, size_t len) { |
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// get output pointer... |
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void *output_ptr = write_ptr(len); |
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// copy value in |
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memcpy(output_ptr, ptr, len); |
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} |
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size_t NetworkPacketBuffer::tell_remaining (void) { |
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// number of bytes in total - number of bytes read |
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return data_size - offset; |
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} |
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/* |
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* NetworkPacket |
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*/ |
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NetworkPacket::NetworkPacket (void) : |
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NetworkPacketBuffer(_buf, NETWORK_PACKET_SIZE, 0) |
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{ |
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} |
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/* |
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* BigNetworkPacket |
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*/ |
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BigNetworkPacket::BigNetworkPacket (size_t size) : |
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NetworkPacketBuffer((char *) malloc(size), size, 0) |
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{ |
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} |
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BigNetworkPacket::~BigNetworkPacket (void) { |
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free(buf_ptr); |
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} |
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