Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//
//=============================================================================//
//
// MessageBuffer - handy for serializing/unserializing
// structures to be sent as messages
// dal - 9/2002
//
#include <stdlib.h>
#include <string.h>
#include "messbuf.h"
#include "tier1/strtools.h"
///////////////////////////
//
//
//
MessageBuffer::MessageBuffer()
{
size = DEFAULT_MESSAGE_BUFFER_SIZE;
data = (char *) malloc(size);
len = 0;
offset = 0;
}
///////////////////////////
//
//
//
MessageBuffer::MessageBuffer(int minsize)
{
size = minsize;
data = (char *) malloc(size);
len = 0;
offset = 0;
}
///////////////////////////
//
//
//
MessageBuffer::~MessageBuffer()
{
free(data);
}
///////////////////////////
//
//
//
int
MessageBuffer::getSize()
{
return size;
}
///////////////////////////
//
//
//
int
MessageBuffer::getLen()
{
return len;
}
///////////////////////////
//
//
//
int
MessageBuffer::setLen(int nlen)
{
if (nlen < 0) return -1;
if (nlen > size) {
resize(nlen);
}
int res = len;
len = nlen;
return res;
}
///////////////////////////
//
//
//
int
MessageBuffer::getOffset()
{
return offset;
}
///////////////////////////
//
//
//
int
MessageBuffer::setOffset(int noffset)
{
if (noffset < 0 || noffset > len) return -1;
int res = offset;
offset = noffset;
return res;
}
///////////////////////////
//
//
//
int
MessageBuffer::write(void const * p, int bytes)
{
if (bytes + len > size) {
resize(bytes + len);
}
memcpy(data + len, p, bytes);
int res = len;
len += bytes;
return res;
}
///////////////////////////
//
//
//
int
MessageBuffer::update(int loc, void const * p, int bytes)
{
if (loc + bytes > size) {
resize(loc + bytes);
}
memcpy(data + loc, p, bytes);
if (len < loc + bytes) {
len = loc + bytes;
}
return len;
}
///////////////////////////
//
//
//
int
MessageBuffer::extract(int loc, void * p, int bytes)
{
if (loc + bytes > len) return -1;
memcpy(p, data + loc, bytes);
return loc + bytes;
}
///////////////////////////
//
//
//
int
MessageBuffer::read(void * p, int bytes)
{
if (offset + bytes > len) return -1;
memcpy(p, data + offset, bytes);
offset += bytes;
return offset;
}
int MessageBuffer::WriteString( const char *pString )
{
return write( pString, V_strlen( pString ) + 1 );
}
int MessageBuffer::ReadString( char *pOut, int bufferLength )
{
int nChars = 0;
while ( 1 )
{
char ch;
if ( read( &ch, sizeof( ch ) ) == -1 )
{
pOut[0] = 0;
return -1;
}
if ( ch == 0 || nChars >= (bufferLength-1) )
break;
pOut[nChars] = ch;
++nChars;
}
pOut[nChars] = 0;
return nChars + 1;
}
///////////////////////////
//
//
//
void
MessageBuffer::clear()
{
memset(data, 0, size);
offset = 0;
len = 0;
}
///////////////////////////
//
//
//
void
MessageBuffer::clear(int minsize)
{
if (minsize > size) {
resize(minsize);
}
memset(data, 0, size);
offset = 0;
len = 0;
}
///////////////////////////
//
//
//
void
MessageBuffer::reset(int minsize)
{
if (minsize > size) {
resize(minsize);
}
len = 0;
offset = 0;
}
///////////////////////////
//
//
//
void
MessageBuffer::resize(int minsize)
{
if (minsize < size) return;
if (size * 2 > minsize) minsize = size * 2;
char * odata = data;
data = (char *) malloc(minsize);
memcpy(data, odata, len);
size = minsize;
free(odata);
}
///////////////////////////
//
//
void
MessageBuffer::print(FILE * ofile, int num)
{
fprintf(ofile, "Len: %d Offset: %d Size: %d\n", len, offset, size);
if (num > size) num = size;
for (int i=0; i<num; ++i) {
fprintf(ofile, "%02x ", (unsigned char) data[i]);
}
fprintf(ofile, "\n");
}