diff options
Diffstat (limited to 'libs/enet/packet.c')
-rw-r--r-- | libs/enet/packet.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/libs/enet/packet.c b/libs/enet/packet.c deleted file mode 100644 index 2fc9a10e..00000000 --- a/libs/enet/packet.c +++ /dev/null @@ -1,157 +0,0 @@ -/** - @file packet.c - @brief ENet packet management functions -*/ -#include <string.h> -#define ENET_BUILDING_LIB 1 -#include "enet/enet.h" - -/** @defgroup Packet ENet packet functions - @{ -*/ - -/** Creates a packet that may be sent to a peer. - @param dataContents initial contents of the packet's data; the packet's data will remain uninitialized if dataContents is NULL. - @param dataLength size of the data allocated for this packet - @param flags flags for this packet as described for the ENetPacket structure. - @returns the packet on success, NULL on failure -*/ -ENetPacket * -enet_packet_create (const void * data, size_t dataLength, enet_uint32 flags) -{ - ENetPacket * packet = (ENetPacket *) enet_malloc (sizeof (ENetPacket)); - if (packet == NULL) - return NULL; - - if (flags & ENET_PACKET_FLAG_NO_ALLOCATE) - packet -> data = (enet_uint8 *) data; - else - { - packet -> data = (enet_uint8 *) enet_malloc (dataLength); - if (packet -> data == NULL) - { - enet_free (packet); - return NULL; - } - - if (data != NULL) - memcpy (packet -> data, data, dataLength); - } - - packet -> referenceCount = 0; - packet -> flags = flags; - packet -> dataLength = dataLength; - packet -> freeCallback = NULL; - - return packet; -} - -/** Destroys the packet and deallocates its data. - @param packet packet to be destroyed -*/ -void -enet_packet_destroy (ENetPacket * packet) -{ - if (packet -> freeCallback != NULL) - (* packet -> freeCallback) (packet); - if (! (packet -> flags & ENET_PACKET_FLAG_NO_ALLOCATE)) - enet_free (packet -> data); - enet_free (packet); -} - -/** Attempts to resize the data in the packet to length specified in the - dataLength parameter - @param packet packet to resize - @param dataLength new size for the packet data - @returns 0 on success, < 0 on failure -*/ -int -enet_packet_resize (ENetPacket * packet, size_t dataLength) -{ - enet_uint8 * newData; - - if (dataLength <= packet -> dataLength || (packet -> flags & ENET_PACKET_FLAG_NO_ALLOCATE)) - { - packet -> dataLength = dataLength; - - return 0; - } - - newData = (enet_uint8 *) enet_malloc (dataLength); - if (newData == NULL) - return -1; - - memcpy (newData, packet -> data, packet -> dataLength); - enet_free (packet -> data); - - packet -> data = newData; - packet -> dataLength = dataLength; - - return 0; -} - -static int initializedCRC32 = 0; -static enet_uint32 crcTable [256]; - -static enet_uint32 -reflect_crc (int val, int bits) -{ - int result = 0, bit; - - for (bit = 0; bit < bits; bit ++) - { - if(val & 1) result |= 1 << (bits - 1 - bit); - val >>= 1; - } - - return result; -} - -static void -initialize_crc32 () -{ - int byte; - - for (byte = 0; byte < 256; ++ byte) - { - enet_uint32 crc = reflect_crc (byte, 8) << 24; - int offset; - - for(offset = 0; offset < 8; ++ offset) - { - if (crc & 0x80000000) - crc = (crc << 1) ^ 0x04c11db7; - else - crc <<= 1; - } - - crcTable [byte] = reflect_crc (crc, 32); - } - - 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) ^ crcTable [(crc & 0xFF) ^ *data++]; - } - - ++ buffers; - } - - return ENET_HOST_TO_NET_32 (~ crc); -} - -/** @} */ |