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engine: common: add GoldSrc bitbuf operations, add support for GoldSrc signed integers

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This commit is contained in:
Alibek Omarov
2024-10-07 19:34:19 +03:00
parent d650d8c271
commit 8deea9dc7e
2 changed files with 71 additions and 12 deletions
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23
engine/common/net_buffer.h
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@@ -42,6 +42,9 @@ struct sizebuf_s
int iCurBit;
int nDataBits;
const char *pDebugName; // buffer name (pointer to const name)
// to support GoldSrc broken signed integers
int iAlternateSign;
};
#define MSG_StartReading MSG_StartWriting
@@ -71,6 +74,7 @@ static inline void MSG_InitExt( sizebuf_t *sb, const char *pDebugName, void *pDa
sb->nDataBits = nBits;
sb->pDebugName = pDebugName;
sb->iAlternateSign = 0;
}
static inline void MSG_StartWriting( sizebuf_t *sb, void *pData, int nBytes, int iStartBit, int nBits )
@@ -169,6 +173,25 @@ static inline qboolean MSG_Overflow( sizebuf_t *sb, int nBits )
return sb->bOverflow;
}
static inline void MSG_EndBitWriting( sizebuf_t *sb )
{
sb->iAlternateSign--;
if( sb->iAlternateSign < 0 )
{
Con_Printf( "%s: non-even MSG_Start/EndBitWriting\n", __func__ );
sb->iAlternateSign = 0;
}
// we have native bit ops here, just pad to closest byte
MSG_SeekToBit( sb, MSG_GetNumBytesWritten( sb ) << 3, SEEK_SET );
}
static inline void MSG_StartBitWriting( sizebuf_t *sb )
{
sb->iAlternateSign++;
}
void MSG_InitMasks( void ); // called once at startup engine
void MSG_ExciseBits( sizebuf_t *sb, int startbit, int bitstoremove );