fteqw/fteqtv/msg.c

147 lines
2.5 KiB
C
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#include "qtv.h"
void InitNetMsg(netmsg_t *b, void *buffer, int bufferlength)
{
b->data = buffer;
b->maxsize = bufferlength;
b->readpos = 0;
b->cursize = 0;
}
unsigned char ReadByte(netmsg_t *b)
{
if (b->readpos >= b->cursize)
{
b->readpos = b->cursize+1;
return 0;
}
return ((unsigned char *)b->data)[b->readpos++];
}
unsigned short ReadShort(netmsg_t *b)
{
int b1, b2;
b1 = ReadByte(b);
b2 = ReadByte(b);
return b1 | (b2<<8);
}
unsigned int ReadLong(netmsg_t *b)
{
int s1, s2;
s1 = ReadShort(b);
s2 = ReadShort(b);
return s1 | (s2<<16);
}
unsigned int BigLong(unsigned int val)
{
union {
unsigned int i;
unsigned char c[4];
} v;
v.i = val;
return (v.c[0]<<24) | (v.c[1] << 16) | (v.c[2] << 8) | (v.c[3] << 0);
}
unsigned int SwapLong(unsigned int val)
{
union {
unsigned int i;
unsigned char c[4];
} v;
unsigned char s;
v.i = val;
s = v.c[0];
v.c[0] = v.c[3];
v.c[3] = s;
s = v.c[1];
v.c[1] = v.c[2];
v.c[2] = s;
return v.i;
}
float ReadFloat(netmsg_t *b)
{
union {
unsigned int i;
float f;
} u;
u.i = ReadLong(b);
return u.f;
}
void ReadString(netmsg_t *b, char *string, int maxlen)
{
maxlen--; //for null terminator
while(maxlen)
{
*string = ReadByte(b);
if (!*string)
return;
string++;
maxlen--;
}
*string++ = '\0'; //add the null
printf("ReadString: buffer is too small\n");
while(ReadByte(b)) //finish reading the string, even if we will loose part of it
;
}
void WriteByte(netmsg_t *b, unsigned char c)
{
if (b->cursize>=b->maxsize)
return;
((unsigned char*)b->data)[b->cursize++] = c;
}
void WriteShort(netmsg_t *b, unsigned short l)
{
WriteByte(b, (l&0x00ff)>>0);
WriteByte(b, (l&0xff00)>>8);
}
void WriteLong(netmsg_t *b, unsigned int l)
{
WriteByte(b, (l&0x000000ff)>>0);
WriteByte(b, (l&0x0000ff00)>>8);
WriteByte(b, (l&0x00ff0000)>>16);
WriteByte(b, (l&0xff000000)>>24);
}
void WriteFloat(netmsg_t *b, float f)
{
union {
unsigned int i;
float f;
} u;
u.f = f;
WriteLong(b, u.i);
}
void WriteString2(netmsg_t *b, const char *str)
{ //no null terminator, convienience function.
while(*str)
WriteByte(b, *str++);
}
void WriteString(netmsg_t *b, const char *str)
{
while(*str)
WriteByte(b, *str++);
WriteByte(b, 0);
}
void WriteData(netmsg_t *b, const void *data, int length)
{
int i;
unsigned char *buf;
if (b->cursize + length > b->maxsize) //urm, that's just too big. :(
return;
buf = (unsigned char*)b->data+b->cursize;
for (i = 0; i < length; i++)
*buf++ = ((unsigned char*)data)[i];
b->cursize+=length;
}