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tinynet.h
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tinynet.h
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/*
------------------------------------------------------------------------------
Licensing information can be found at the end of the file.
------------------------------------------------------------------------------
tinynet.h - v0.0
*/
/*
docs, blah
*/
// TODO
// make asserts compile out in release
// audit the asserts and add in release mode if statements
#if !defined( TINYNET_H )
#define TN_WINDOWS 1
#define TN_MAC 2
#define TN_UNIX 3
#if defined( _WIN32 )
#define TN_PLATFORM TN_WINDOWS
#elif defined( __APPLE__ )
#define TN_PLATFORM TN_MAC
#else
#define TN_PLATFORM TN_UNIX
#endif
const char* g_tnErrorReason;
#define TN_RELIABLE_BYTE_COUNT 256
#define TN_RELIABLE_WORD_COUNT (TN_RELIABLE_BYTE_COUNT / sizeof( uint32_t ))
// clang is a bitch and aggressively deletes *(int*) = 0
#if TN_PLATFORM == TN_MAC && defined( __clang__ )
#define TN_ASSERT_INTERNAL __builtin_trap( )
#else
#define TN_ASSERT_INTERNAL *(int*)0 = 0
#endif
#define TN_CHECK( X, Y ) do { if ( !(X) ) { g_tnErrorReason = Y; return 0; } } while ( 0 )
#define TN_ASSERT( X ) do { if ( !(X) ) TN_ASSERT_INTERNAL; } while ( 0 )
#define TN_ALIGN( X, Y ) ((((size_t)X) + ((Y) - 1)) & ~((Y) - 1))
#define TN_MAX_ADDRESS_LEN 256
#define TN_PROTOCOL_ID 0xC883FC1D
#define TN_MTU 1200
#define TN_MTU_WORDCOUNT (TN_MTU / sizeof( uint32_t ))
#define TN_PACKET_TYPE_BYTES 4
#define TN_CRC_BYTES 4
#define TN_PACKET_DATA_MAX_SIZE 1024
#define TN_MIN( a, b ) ((a) < (b) ? a : b)
#define TN_MAX( a, b ) ((a) > (b) ? a : b)
#define TN_INT16_MAX ((uint16_t)32768)
#define TN_UINT16_MAX ((uint16_t)~0)
// TODO: create macros to detect platform and setup as necessary
#define TN_BIG_ENDIAN 0
#if TN_BIG_ENDIAN
#define tnEndian( a ) a = tnSWAP_INTERNAL( a )
#else
#define tnEndian( a ) a
#endif
#if TN_PLATFORM == TN_WINDOWS
#define NOMINMAX
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS FUCK_YOU
#define tn_snprintf _snprintf
#include <winsock2.h> // socket
#include <ws2tcpip.h> // WSA stuff
#pragma comment( lib, "ws2_32.lib" )
#elif TN_PLATFORM == TN_MAC || TN_PLATFORM == TN_UNIX
#include <sys/socket.h> // socket
#include <fcntl.h> // fcntl
#include <arpa/inet.h> // inet_pton
#include <unistd.h> // close
#include <errno.h>
#endif
// TODO
// add in preprocessor stuff to use stb_sprintf
#include <stdio.h> // printf (debug only), sprintf
#include <stdint.h>
#include <string.h> // memcpy, memset
#include <stdlib.h> // atoi
#if 1
#define TN_DEBUG_PRINT( ... ) printf( __VA_ARGS__ )
#else
#define TN_DEBUG_PRINT( ... )
#endif
uint16_t tnSWAP_INTERNAL( uint16_t a )
{
return ((a & 0x00FF) << 8)
| ((a & 0xFF00) >> 8);
}
int16_t tnSWAP_INTERNAL( int16_t a )
{
return ((a & 0x00FF) << 8)
| ((a & 0xFF00) >> 8);
}
uint32_t tnSWAP_INTERNAL( uint32_t a )
{
return ((a & 0x000000FF) << 24)
| ((a & 0x0000FF00) << 8)
| ((a & 0x00FF0000) >> 8)
| ((a & 0xFF000000) >> 24);
}
int32_t tnSWAP_INTERNAL( int32_t a )
{
return ((a & 0x000000FF) << 24)
| ((a & 0x0000FF00) << 8)
| ((a & 0x00FF0000) >> 8)
| ((a & 0xFF000000) >> 24);
}
union tnU32F32
{
uint32_t uval;
float fval;
};
union tnU64F64
{
uint64_t uval;
double fval;
};
float tnSWAP_INTERNAL( float a )
{
tnU32F32 u;
u.fval = a;
u.uval = tnSWAP_INTERNAL( u.uval );
return u.fval;
}
uint32_t tnPopCount( uint32_t x )
{
uint32_t a = x - ((x >> 1) & 0x55555555);
uint32_t b = (((a >> 2) & 0x33333333) + (a & 0x33333333));
uint32_t c = (((b >> 4) + b) & 0x0f0f0f0f);
uint32_t d = c + (c >> 8);
uint32_t e = d + (d >> 16);
uint32_t f = e & 0x0000003f;
return f;
}
uint32_t tnLog2( uint32_t x )
{
uint32_t a = x | ( x >> 1 );
uint32_t b = a | ( a >> 2 );
uint32_t c = b | ( b >> 4 );
uint32_t d = c | ( c >> 8 );
uint32_t e = d | ( d >> 16 );
uint32_t f = e >> 1;
return tnPopCount( f );
}
uint32_t tnBitsRequired( uint32_t min, uint32_t max )
{
return (min == max) ? 0 : tnLog2( max - min ) + 1;
}
struct tnBuffer
{
uint64_t bits;
uint32_t count;
uint32_t* words;
uint32_t word_index;
int32_t bits_left;
int32_t bits_total;
};
tnBuffer tnMakeBuffer( uint32_t* words, uint32_t word_count )
{
tnBuffer buffer;
buffer.bits = 0;
buffer.count = 0;
buffer.words = words;
buffer.word_index = 0;
buffer.bits_left = word_count * sizeof( uint32_t ) * 8;
buffer.bits_total = buffer.bits_left;
return buffer;
}
size_t tnSize( tnBuffer* buffer )
{
return TN_ALIGN( buffer->bits_total - buffer->bits_left, 32 ) / 8;
}
int tnWouldOverflow( tnBuffer* buffer, uint32_t num_bits )
{
return buffer->bits_left - (int32_t)num_bits < 0;
}
uint32_t tnReadBits_internal( tnBuffer* buffer, uint32_t num_bits_to_read )
{
TN_ASSERT( num_bits_to_read <= 32 );
TN_ASSERT( num_bits_to_read > 0 );
TN_ASSERT( buffer->bits_left > 0 );
TN_ASSERT( buffer->count <= 64 );
TN_ASSERT( !tnWouldOverflow( buffer, num_bits_to_read ) );
if ( buffer->count < num_bits_to_read )
{
buffer->bits |= (uint64_t)(tnEndian( buffer->words[ buffer->word_index ] )) << buffer->count;
buffer->count += 32;
buffer->word_index += 1;
}
TN_ASSERT( buffer->count >= num_bits_to_read );
uint32_t bits = buffer->bits & (((uint64_t)1 << num_bits_to_read) - 1);
buffer->bits >>= num_bits_to_read;
buffer->count -= num_bits_to_read;
buffer->bits_left -= num_bits_to_read;
return bits;
}
void tnWriteBits( tnBuffer* buffer, uint32_t value, uint32_t num_bits_to_write )
{
TN_ASSERT( buffer );
TN_ASSERT( num_bits_to_write <= 32 );
TN_ASSERT( buffer->bits_left > 0 );
TN_ASSERT( buffer->count <= 32 );
TN_ASSERT( !tnWouldOverflow( buffer, num_bits_to_write ) );
buffer->bits |= (uint64_t)(value & (((uint64_t)1 << num_bits_to_write) - 1)) << buffer->count;
buffer->count += num_bits_to_write;
buffer->bits_left -= num_bits_to_write;
if ( buffer->count >= 32 )
{
buffer->words[ buffer->word_index ] = tnEndian( (uint32_t)(buffer->bits & ((uint32_t)~0)) );
buffer->bits >>= 32;
buffer->count -= 32;
buffer->word_index += 1;
}
}
void tnFlush( tnBuffer* buffer )
{
TN_ASSERT( buffer->count <= 32 );
if ( buffer->count )
{
buffer->words[ buffer->word_index ] = tnEndian( (uint32_t)(buffer->bits & ((uint32_t)~0)) );
}
}
static const uint32_t g_CRC32[ 256 ] = {
0x00000000,0x77073096,0xEE0E612C,0x990951BA,0x076DC419,0x706AF48F,0xE963A535,0x9E6495A3,
0x0EDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,0x09B64C2B,0x7EB17CBD,0xE7B82D07,0x90BF1D91,
0x1DB71064,0x6AB020F2,0xF3B97148,0x84BE41DE,0x1ADAD47D,0x6DDDE4EB,0xF4D4B551,0x83D385C7,
0x136C9856,0x646BA8C0,0xFD62F97A,0x8A65C9EC,0x14015C4F,0x63066CD9,0xFA0F3D63,0x8D080DF5,
0x3B6E20C8,0x4C69105E,0xD56041E4,0xA2677172,0x3C03E4D1,0x4B04D447,0xD20D85FD,0xA50AB56B,
0x35B5A8FA,0x42B2986C,0xDBBBC9D6,0xACBCF940,0x32D86CE3,0x45DF5C75,0xDCD60DCF,0xABD13D59,
0x26D930AC,0x51DE003A,0xC8D75180,0xBFD06116,0x21B4F4B5,0x56B3C423,0xCFBA9599,0xB8BDA50F,
0x2802B89E,0x5F058808,0xC60CD9B2,0xB10BE924,0x2F6F7C87,0x58684C11,0xC1611DAB,0xB6662D3D,
0x76DC4190,0x01DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x06B6B51F,0x9FBFE4A5,0xE8B8D433,
0x7807C9A2,0x0F00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,0x086D3D2D,0x91646C97,0xE6635C01,
0x6B6B51F4,0x1C6C6162,0x856530D8,0xF262004E,0x6C0695ED,0x1B01A57B,0x8208F4C1,0xF50FC457,
0x65B0D9C6,0x12B7E950,0x8BBEB8EA,0xFCB9887C,0x62DD1DDF,0x15DA2D49,0x8CD37CF3,0xFBD44C65,
0x4DB26158,0x3AB551CE,0xA3BC0074,0xD4BB30E2,0x4ADFA541,0x3DD895D7,0xA4D1C46D,0xD3D6F4FB,
0x4369E96A,0x346ED9FC,0xAD678846,0xDA60B8D0,0x44042D73,0x33031DE5,0xAA0A4C5F,0xDD0D7CC9,
0x5005713C,0x270241AA,0xBE0B1010,0xC90C2086,0x5768B525,0x206F85B3,0xB966D409,0xCE61E49F,
0x5EDEF90E,0x29D9C998,0xB0D09822,0xC7D7A8B4,0x59B33D17,0x2EB40D81,0xB7BD5C3B,0xC0BA6CAD,
0xEDB88320,0x9ABFB3B6,0x03B6E20C,0x74B1D29A,0xEAD54739,0x9DD277AF,0x04DB2615,0x73DC1683,
0xE3630B12,0x94643B84,0x0D6D6A3E,0x7A6A5AA8,0xE40ECF0B,0x9309FF9D,0x0A00AE27,0x7D079EB1,
0xF00F9344,0x8708A3D2,0x1E01F268,0x6906C2FE,0xF762575D,0x806567CB,0x196C3671,0x6E6B06E7,
0xFED41B76,0x89D32BE0,0x10DA7A5A,0x67DD4ACC,0xF9B9DF6F,0x8EBEEFF9,0x17B7BE43,0x60B08ED5,
0xD6D6A3E8,0xA1D1937E,0x38D8C2C4,0x4FDFF252,0xD1BB67F1,0xA6BC5767,0x3FB506DD,0x48B2364B,
0xD80D2BDA,0xAF0A1B4C,0x36034AF6,0x41047A60,0xDF60EFC3,0xA867DF55,0x316E8EEF,0x4669BE79,
0xCB61B38C,0xBC66831A,0x256FD2A0,0x5268E236,0xCC0C7795,0xBB0B4703,0x220216B9,0x5505262F,
0xC5BA3BBE,0xB2BD0B28,0x2BB45A92,0x5CB36A04,0xC2D7FFA7,0xB5D0CF31,0x2CD99E8B,0x5BDEAE1D,
0x9B64C2B0,0xEC63F226,0x756AA39C,0x026D930A,0x9C0906A9,0xEB0E363F,0x72076785,0x05005713,
0x95BF4A82,0xE2B87A14,0x7BB12BAE,0x0CB61B38,0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0x0BDBDF21,
0x86D3D2D4,0xF1D4E242,0x68DDB3F8,0x1FDA836E,0x81BE16CD,0xF6B9265B,0x6FB077E1,0x18B74777,
0x88085AE6,0xFF0F6A70,0x66063BCA,0x11010B5C,0x8F659EFF,0xF862AE69,0x616BFFD3,0x166CCF45,
0xA00AE278,0xD70DD2EE,0x4E048354,0x3903B3C2,0xA7672661,0xD06016F7,0x4969474D,0x3E6E77DB,
0xAED16A4A,0xD9D65ADC,0x40DF0B66,0x37D83BF0,0xA9BCAE53,0xDEBB9EC5,0x47B2CF7F,0x30B5FFE9,
0xBDBDF21C,0xCABAC28A,0x53B39330,0x24B4A3A6,0xBAD03605,0xCDD70693,0x54DE5729,0x23D967BF,
0xB3667A2E,0xC4614AB8,0x5D681B02,0x2A6F2B94,0xB40BBE37,0xC30C8EA1,0x5A05DF1B,0x2D02EF8D
};
uint32_t tnCRC32( const void* memory, size_t bytes, uint32_t crc32 )
{
uint8_t* buffer = (uint8_t*)memory;
crc32 = ~crc32;
for ( size_t i = 0; i < bytes; ++i )
crc32 = (crc32 >> 8) ^ g_CRC32[ (crc32 ^ buffer[ i ]) & 0xFF ];
return ~crc32;
}
enum tnAddressType
{
TN_ADDRESS_NONE,
TN_ADDRESS_IPV4,
TN_ADDRESS_IPV6
};
struct tnAddress
{
tnAddressType type;
uint16_t port;
union
{
uint32_t ipv4;
uint16_t ipv6[ 8 ];
};
};
tnAddress tnMakeAddress( uint32_t address, int16_t port )
{
tnAddress addr;
addr.type = TN_ADDRESS_IPV4;
addr.port = port;
addr.ipv4 = htonl( address );
return addr;
}
tnAddress tnMakeAddress( int16_t port )
{
tnAddress addr;
addr.type = TN_ADDRESS_IPV4;
addr.port = port;
addr.ipv4 = htonl( INADDR_ANY );
return addr;
}
tnAddress tnMakeAddress( uint8_t a, uint8_t b, uint8_t c, uint8_t d, int16_t port )
{
uint32_t ipv4 = (uint32_t)a | (uint32_t)b << 8 | (uint32_t)c << 16 | (uint32_t)d << 24;
return tnMakeAddress( ipv4, port );
}
tnAddress tnMakeAddress( sockaddr_storage* sockaddr )
{
TN_ASSERT( sockaddr );
tnAddress addr;
switch ( sockaddr->ss_family )
{
case AF_INET:
{
sockaddr_in* addr_ipv4 = (sockaddr_in*)sockaddr;
addr.type = TN_ADDRESS_IPV4;
addr.port = ntohs( addr_ipv4->sin_port );
addr.ipv4 = addr_ipv4->sin_addr.s_addr;
} break;
case AF_INET6:
{
sockaddr_in6* addr_ipv6 = (sockaddr_in6*)sockaddr;
addr.type = TN_ADDRESS_IPV6;
addr.port = ntohs( addr_ipv6->sin6_port );
memcpy( addr.ipv6, &addr_ipv6->sin6_addr, 16 );
} break;
default: TN_ASSERT( 0 );
}
return addr;
}
tnAddress tnMakeAddress( const char* string )
{
TN_ASSERT( string );
char memory[ TN_MAX_ADDRESS_LEN ];
strncpy( memory, string, TN_MAX_ADDRESS_LEN - 1 );
memory[ TN_MAX_ADDRESS_LEN - 1 ] = 0;
char* buffer = memory;
tnAddress address;
address.type = TN_ADDRESS_NONE;
address.port = 0;
// ipv6 first
// handle [address]:port format first
// then try inet_pton
if ( *buffer == '[' )
{
buffer += 1;
char* search = buffer;
char c;
while ( (c = *search++) )
{
if ( c == ']' )
{
if ( *search == ':' )
{
address.port = (uint16_t)atoi( search + 1 );
search[ -1 ] = 0;
break;
}
}
}
}
in6_addr sockaddr6;
if ( inet_pton( AF_INET6, buffer, &sockaddr6 ) == 1 )
{
memcpy( address.ipv6, &sockaddr6, 16 );
address.type = TN_ADDRESS_IPV6;
return address;
}
// now try ipv4
// first handle format of "address:port"
// then try inet_pton
char* search = buffer;
char c;
while ( (c = *search++) )
{
if ( c == ':' )
{
address.port = (uint16_t)atoi( search );
search[ -1 ] = 0;
break;
}
}
sockaddr_in sockaddr4;
if ( inet_pton( AF_INET, buffer, &sockaddr4.sin_addr ) == 1 )
{
address.type = TN_ADDRESS_IPV4;
address.ipv4 = sockaddr4.sin_addr.s_addr;
return address;
}
return address;
}
void tnAddressString( tnAddress address, char* buffer, int max_buffer_bytes )
{
switch ( address.type )
{
case TN_ADDRESS_IPV4:
{
uint8_t a = address.ipv4 & 0xFF;
uint8_t b = (address.ipv4 >> 8) & 0xFF;
uint8_t c = (address.ipv4 >> 16) & 0xFF;
uint8_t d = (address.ipv4 >> 24) & 0xFF;
if ( address.port ) tn_snprintf( buffer, max_buffer_bytes, "%d.%d.%d.%d:%d", a, b, c, d, address.port );
else tn_snprintf( buffer, max_buffer_bytes, "%d.%d.%d.%d", a, b, c, d );
} break;
case TN_ADDRESS_IPV6:
{
if ( address.port )
{
char inet6_addrstr[ INET6_ADDRSTRLEN ];
inet_ntop( AF_INET6, (void*)address.ipv6, inet6_addrstr, INET6_ADDRSTRLEN );
tn_snprintf( buffer, max_buffer_bytes, "[%s]:%d", inet6_addrstr, address.port );
}
else inet_ntop( AF_INET6, (void*)address.ipv6, buffer, max_buffer_bytes );
} break;
default: TN_ASSERT( 0 );
}
}
int tnAddressEqu( tnAddress a, tnAddress b )
{
if ( a.type != b.type ) return 0;
if ( a.port != b.port ) return 0;
switch ( a.type )
{
case TN_ADDRESS_IPV4: if ( a.ipv4 != b.ipv4 ) return 0; break;
case TN_ADDRESS_IPV6: if ( memcmp( a.ipv6, b.ipv6, sizeof( a.ipv6 ) ) ) return 0; break;
default: TN_ASSERT( 0 );
}
return 1;
}
#if TN_PLATFORM == TN_WINDOWS
typedef SOCKET tnSocketHandle;
#else
typedef int tnSocketHandle;
#endif
enum tnSocketError
{
TN_SOCKET_ERROR_NONE,
TN_SOCKET_ERROR_MAKE_FAILED,
TN_SOCKET_ERROR_SET_NON_BLOCKING_FAILED,
TN_SOCKET_ERROR_SETSOCKOPT_IPV6_ONLY_FAILED,
TN_SOCKET_ERROR_SETSOCKOPT_RCVBUF_FAILED,
TN_SOCKET_ERROR_SETSOCKOPT_SNDBUF_FAILED,
TN_SOCKET_ERROR_BIND_IPV4_FAILED,
TN_SOCKET_ERROR_BIND_IPV6_FAILED,
TN_SOCKET_ERROR_GETSOCKNAME_IPV4_FAILED,
TN_SOCKET_ERROR_GETSOCKNAME_IPV6_FAILED
};
struct tnSocket
{
tnSocketHandle handle;
tnAddress address;
tnSocketError error_code;
};
tnSocket tnMakeSocket( tnAddress address, int buffer_size, int true_for_nonblocking )
{
tnSocket socket;
socket.error_code = TN_SOCKET_ERROR_NONE;
socket.handle = ::socket( address.type == TN_ADDRESS_IPV6 ? AF_INET6 : AF_INET, SOCK_DGRAM, IPPROTO_UDP );
#if TN_PLATFORM == TN_WINDOWS
if ( socket.handle == INVALID_SOCKET )
#else
if ( socket.handle <= 0 )
#endif
{
socket.error_code = TN_SOCKET_ERROR_MAKE_FAILED;
return socket;
}
// allow users to enforce ipv6 only
// see: https://msdn.microsoft.com/en-us/library/windows/desktop/ms738574(v=vs.85).aspx
if ( address.type == TN_ADDRESS_IPV6 )
{
int enable = 1;
if ( setsockopt( socket.handle, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&enable, sizeof( enable ) ) )
{
socket.error_code = TN_SOCKET_ERROR_SETSOCKOPT_IPV6_ONLY_FAILED;
return socket;
}
}
// set socket send/recieve buffer sizes to our chosen size
if ( setsockopt( socket.handle, SOL_SOCKET, SO_RCVBUF, (char*)&buffer_size, sizeof( int ) ) )
{
socket.error_code = TN_SOCKET_ERROR_SETSOCKOPT_RCVBUF_FAILED;
return socket;
}
if ( setsockopt( socket.handle, SOL_SOCKET, SO_SNDBUF, (char*)&buffer_size, sizeof( int ) ) )
{
socket.error_code = TN_SOCKET_ERROR_SETSOCKOPT_SNDBUF_FAILED;
return socket;
}
// bind port
switch ( address.type )
{
case TN_ADDRESS_IPV4:
{
sockaddr_in sock_address;
sock_address.sin_family = AF_INET;
sock_address.sin_addr.s_addr = address.ipv4;
sock_address.sin_port = htons( address.port );
if ( bind( socket.handle, (const sockaddr*)&sock_address, sizeof( sock_address ) ) < 0 )
{
socket.error_code = TN_SOCKET_ERROR_BIND_IPV4_FAILED;
return socket;
}
} break;
case TN_ADDRESS_IPV6:
{
sockaddr_in6 sock_address;
memset( &sock_address, 0, sizeof( sockaddr_in6 ) );
sock_address.sin6_family = AF_INET6;
memcpy( &sock_address.sin6_addr, address.ipv6, sizeof( sock_address.sin6_addr ) );
sock_address.sin6_port = htons( address.port );
if ( bind( socket.handle, (const sockaddr*)&sock_address, sizeof( sock_address ) ) < 0 )
{
socket.error_code = TN_SOCKET_ERROR_BIND_IPV6_FAILED;
return socket;
}
} break;
default: TN_ASSERT( 0 );
}
// handle auto-picked ports
if ( !address.port )
{
if ( address.type == TN_ADDRESS_IPV6 )
{
struct sockaddr_in6 sin;
socklen_t len = sizeof( sin );
if ( getsockname( socket.handle, (struct sockaddr*)&sin, &len ) == -1 )
{
socket.error_code = TN_SOCKET_ERROR_GETSOCKNAME_IPV6_FAILED;
return socket;
}
address.port = ntohs( sin.sin6_port );
}
else
{
struct sockaddr_in sin;
socklen_t len = sizeof( sin );
if ( getsockname( socket.handle, (struct sockaddr*)&sin, &len ) == -1 )
{
socket.error_code = TN_SOCKET_ERROR_GETSOCKNAME_IPV4_FAILED;
return socket;
}
address.port = ntohs( sin.sin_port );
}
}
socket.address = address;
// set blocking/non-blocking io
#if TN_PLATFORM == TN_MAC || TN_PLATFORM == TN_UNIX
int nonBlocking = true_for_nonblocking;
if ( fcntl( socket.handle, F_SETFL, O_NONBLOCK, nonBlocking ) == -1 )
{
socket.error_code = TN_SOCKET_ERROR_SET_NON_BLOCKING_FAILED;
return socket;
}
#elif TN_PLATFORM == TN_WINDOWS
DWORD nonBlocking = true_for_nonblocking;
if ( ioctlsocket( socket.handle, FIONBIO, &nonBlocking ) != 0 )
{
socket.error_code = TN_SOCKET_ERROR_SET_NON_BLOCKING_FAILED;
return socket;
}
#endif
return socket;
}
void tnCloseSocket( tnSocket* socket )
{
if ( socket->handle )
{
#if TN_PLATFORM == TN_MAC || TN_PLATFORM == TN_UNIX
close( socket->handle );
#elif TN_PLATFORM == TN_WINDOWS
closesocket( socket->handle );
#endif
socket->handle = 0;
}
}
typedef void (*tnWrite)( tnBuffer* buffer, void* data );
typedef int (*tnRead)( tnBuffer* buffer, void* data );
typedef int (*tnMeasure)( );
struct tnVTABLE
{
tnWrite Write;
tnRead Read;
tnMeasure Measure;
int runtime_size;
};
struct tnSimPacket
{
int size;
int64_t delay;
struct tnTransport* transport;
tnSimPacket* next;
uint32_t words[ TN_MTU_WORDCOUNT ];
};
struct tnNetSim
{
int latency;
int jitter;
int drop;
int corruption;
int duplicates;
int duplicates_min;
int duplicates_max;
int pool_size;
tnSimPacket* packets;
tnSimPacket* free_list;
tnSimPacket* live_packets;
};
struct tnNetSimDef
{
int latency; // milliseconds, delay before sending packets
int jitter; // milliseconds, random value/sign from 0-jitter
int drop; // percent chance, 0-100, of dropping an outgoing packet
int corruption; // percent chance, 0-100, of corrupting outgoing packets
int duplicates; // percent chance, 0-100, of duplicating outgoing packets
int duplicates_min; // min of range of duplicate packet count
int duplicates_max; // max of range of duplicate packet count
int pool_size; // num of entries for internal pool to buffer outgoing packets
};
// OPTIMIZE
// Can remove this? Modify sequence buffer to handle NO DATA somehow
// perhaps return (void*)1 if sequence exists, keep data pointer 0
struct tnIncomingPacketData
{
};
#define TN_MAX_RELIABLES 64
#define TN_MAX_RELIABLES_BITS_REQUIRED 7
struct tnOutgoingPacketData
{
int acked;
int64_t send_time;
int count;
uint16_t ids[ TN_MAX_RELIABLES ];
};
struct tnReliableData
{
int user_type;
uint32_t data[ TN_RELIABLE_WORD_COUNT ];
};
#define TN_SEQUENCE_BUFFER_SIZE 256
struct tnSequenceBuffer
{
uint16_t sequence;
uint32_t buffer[ TN_SEQUENCE_BUFFER_SIZE ];
int stride;
char* data;
};
void tnMakeSequenceBuffer( tnSequenceBuffer* buffer, int stride )
{
TN_ASSERT( stride >= 0 );
buffer->sequence = 0;
buffer->data = (char*)malloc( stride * TN_SEQUENCE_BUFFER_SIZE );
buffer->stride = stride;
TN_ASSERT( buffer->data );
memset( buffer->data, 0, stride * TN_SEQUENCE_BUFFER_SIZE );
for ( int i = 0; i < TN_SEQUENCE_BUFFER_SIZE; ++i ) buffer->buffer[ i ] = ~0;
}
void tnFreeSequenceBuffer( tnSequenceBuffer* seq_buf )
{
free( seq_buf->data );
memset( seq_buf, 0, sizeof( tnSequenceBuffer ) );
}
void* tnGetSequenceData( tnSequenceBuffer* seq_buf, uint16_t sequence )
{
int index = sequence % TN_SEQUENCE_BUFFER_SIZE;
if ( seq_buf->buffer[ index ] == sequence ) return seq_buf->data + index * seq_buf->stride;
else return 0;
}
int tnSequenceExists( tnSequenceBuffer* seq_buf, uint16_t sequence )
{
int index = sequence % TN_SEQUENCE_BUFFER_SIZE;
return seq_buf->buffer[ index ] != ~0;
}
void tnSequenceRemove( tnSequenceBuffer* seq_buf, uint16_t sequence )
{
int index = sequence % TN_SEQUENCE_BUFFER_SIZE;
seq_buf->buffer[ index ] = ~0;
}
int tnMoreRecent( uint16_t a, uint16_t b )
{
int yes = (a > b) && (a - b <= TN_INT16_MAX);
int yes_wrap = (a < b) && (b - a > TN_INT16_MAX);
return yes || yes_wrap;
}
int tnLessRecent( uint16_t a, uint16_t b )
{
return tnMoreRecent( b, a );
}
void tnClearEntries( uint32_t* seq, int a, int b )
{
if ( b < a ) b += TN_UINT16_MAX;
for ( int i = a; i <= b; ++i ) seq[ i % TN_SEQUENCE_BUFFER_SIZE ] = ~0;
}
void* tnInsertSequence( tnSequenceBuffer* seq_buf, uint16_t sequence )
{
if ( tnMoreRecent( sequence + 1, seq_buf->sequence ) )
{
tnClearEntries( seq_buf->buffer, seq_buf->sequence, sequence );
seq_buf->sequence = sequence + 1;
}
else if ( tnMoreRecent( seq_buf->sequence - TN_SEQUENCE_BUFFER_SIZE, sequence ) ) return 0;
int index = sequence % TN_SEQUENCE_BUFFER_SIZE;
seq_buf->buffer[ index ] = sequence;
return seq_buf->data + index * seq_buf->stride;
}
void tnMakeAck( tnSequenceBuffer* seq, uint16_t* ack, uint32_t* ack_bits )
{
uint16_t local = seq->sequence - 1;
*ack = local;
uint32_t bits = 0;
for ( int i = 0; i < 32; ++i )
{
uint16_t sequence = local - (uint16_t)i;
if ( tnGetSequenceData( seq, sequence ) ) bits |= (1 << i);
}
*ack_bits = bits;
}
struct tnContext
{
int vtable_count;
tnVTABLE* vtables;
int use_sim;
int running;
tnNetSim sim;
};
tnVTABLE* tnGetTable( tnContext* ctx, int user_type )
{
TN_ASSERT( user_type >= 0 );
TN_ASSERT( user_type < ctx->vtable_count );
return ctx->vtables + user_type;
}
#if TN_PLATFORM == TN_WINDOWS
typedef struct
{
CRITICAL_SECTION critical_section;
LARGE_INTEGER prev;
LARGE_INTEGER freq;
} tnPlatform;
#elif TN_PLATFORM == TN_MAC
typedef struct
{
pthread_t thread;
pthread_mutex_t mutex;
} tnPlatform;
#endif
enum tnQueuePacketStatus
{
TN_QUEUE_EMPTY,
TN_QUEUE_NOT_PROCESSED,
TN_QUEUE_PROCESSED
};
typedef struct
{
tnQueuePacketStatus state;
int64_t timestamp;
int size;
int user_type;
tnAddress from;
uint32_t words[ TN_MTU_WORDCOUNT ];
} tnQueuePacket;
#define TN_QUEUE_CAPACITY 1024
typedef struct
{
int insert_count;
int insert_index;
int process_count;
int process_index;
int pop_index;
tnQueuePacket packets[ TN_QUEUE_CAPACITY ];
} tnQueue;
static int tnQueuePop( tnQueue* q, void* out, int64_t* ticks )
{
if ( q->insert_count == TN_QUEUE_CAPACITY ) return 0;
tnQueuePacket* p = q->packets + q->pop_index;
if ( p->state != TN_QUEUE_PROCESSED ) return 0;
memcpy( out, p->words, p->size );
*ticks = p->timestamp;
q->pop_index++;
q->pop_index %= TN_QUEUE_CAPACITY;
q->insert_count++;
return p->size;
}
static int tnQueuePush( tnQueue* q, void* data, int size, tnAddress from, int64_t ticks )
{
if ( size > TN_MTU ) return 0;
if ( !q->insert_count ) return 0;
TN_ASSERT( q->insert_count > 0 );
TN_ASSERT( q->insert_count <= TN_QUEUE_CAPACITY );
int index = q->insert_index++;
q->insert_index %= TN_QUEUE_CAPACITY;
tnQueuePacket* p = q->packets + index;
p->state = TN_QUEUE_NOT_PROCESSED;
p->timestamp = ticks;
p->size = size;
p->from = from;
memcpy( p->words, data, size );
q->insert_count--;
q->process_count++;
return 1;
}
static void tnProcessPacket( tnQueuePacket* p )
{
// decrypt
// decompress
}
static int tnQueueProcess( tnQueue* q )
{
int did_work = 0;
while ( q->process_count )
{
tnQueuePacket* p = q->packets + q->process_index;
tnProcessPacket( p );
p->state = TN_QUEUE_PROCESSED;
q->process_count--;
q->process_index++;
q->process_index %= TN_QUEUE_CAPACITY;
did_work = 1;
}
return did_work;
}
struct tnTransport
{
const char* debug_name;
tnContext* ctx;
tnSocket socket;
tnAddress to;
tnSequenceBuffer incoming;
tnSequenceBuffer outgoing;
uint16_t reliable_next_incoming;
uint16_t reliable_oldest_unacked;
tnSequenceBuffer reliable_incoming;
tnSequenceBuffer reliable_outgoing;
int round_trip_time;
int round_trip_time_millis;
// worker thread data
int using_worker_thread;
int sleep_milliseconds;
tnQueue* q;
// platform data
tnPlatform pd;
};
static void tnAddQueue( tnTransport* transport )
{
tnQueue* q = (tnQueue*)malloc( sizeof( tnQueue ) );
q->insert_count = TN_QUEUE_CAPACITY;
q->insert_index = 0;
q->process_count = 0;
q->process_index = 0;
q->pop_index = 0;
for ( int i = 0; i < TN_QUEUE_CAPACITY; ++i )
{
tnQueuePacket* p = q->packets + i;
p->state = TN_QUEUE_EMPTY;
}
transport->q = q;
}
int tnDoWork( tnTransport* transport );
#if TN_PLATFORM == TN_WINDOWS
void tnSleep( int milliseconds )
{
Sleep( milliseconds );
}
static void tnLock( tnTransport* transport )
{
if ( transport->using_worker_thread ) EnterCriticalSection( &transport->pd.critical_section );
}
static void tnUnlock( tnTransport* transport )
{
if ( transport->using_worker_thread ) LeaveCriticalSection( &transport->pd.critical_section );
}
static DWORD WINAPI tnWorkerThread( LPVOID lpParameter )
{
tnTransport* transport = (tnTransport*)lpParameter;