diff options
Diffstat (limited to 'packet.c')
| -rw-r--r-- | packet.c | 65 |
1 files changed, 60 insertions, 5 deletions
@@ -21,10 +21,15 @@ enet_packet_create (const void * data, size_t dataLength, enet_uint32 flags) { ENetPacket * packet = (ENetPacket *) enet_malloc (sizeof (ENetPacket)); - packet -> data = (enet_uint8 *) enet_malloc (dataLength); + if(flags & ENET_PACKET_FLAG_NO_ALLOCATE) + packet -> data = (enet_uint8 *) data; + else + { + packet -> data = (enet_uint8 *) enet_malloc (dataLength); - if (data != NULL) - memcpy (packet -> data, data, dataLength); + if (data != NULL) + memcpy (packet -> data, data, dataLength); + }; packet -> referenceCount = 0; packet -> flags = flags; @@ -39,7 +44,8 @@ enet_packet_create (const void * data, size_t dataLength, enet_uint32 flags) void enet_packet_destroy (ENetPacket * packet) { - enet_free (packet -> data); + if((packet -> flags & ENET_PACKET_FLAG_NO_ALLOCATE) == 0) + enet_free (packet -> data); enet_free (packet); } @@ -54,7 +60,7 @@ enet_packet_resize (ENetPacket * packet, size_t dataLength) { enet_uint8 * newData; - if (dataLength <= packet -> dataLength) + if (dataLength <= packet -> dataLength || (packet -> flags & ENET_PACKET_FLAG_NO_ALLOCATE)) { packet -> dataLength = dataLength; @@ -71,4 +77,53 @@ enet_packet_resize (ENetPacket * packet, size_t dataLength) return 0; } +static int initializedCRC32 = 0; +static enet_uint32 crcTable [256]; + +static void initialize_crc32 () +{ + int byte; + + for (byte = 0; byte < 256; ++ byte) + { + enet_uint32 crc = byte << 24; + int offset; + + for(offset = 0; offset < 8; ++ offset) + { + if (crc & 0x80000000) + crc = (crc << 1) ^ 0x04c11db7; + else + crc <<= 1; + } + + crcTable [byte] = crc; + } + + initializedCRC32 = 1; +} + +enet_uint32 +enet_crc32 (const ENetBuffer * buffers, size_t bufferCount) +{ + enet_uint32 crc = 0xFFFFFFFF; + + if (! initializedCRC32) initialize_crc32 (); + + while (bufferCount -- > 0) + { + const enet_uint8 * data = (const enet_uint8 *) buffers -> data, + * dataEnd = & data [buffers -> dataLength]; + + while (data < dataEnd) + { + crc = ((crc << 8) | * data ++) ^ crcTable [crc >> 24]; + } + + ++ buffers; + } + + return ENET_HOST_TO_NET_32 (~ crc); +} + /** @} */ |