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#ifndef NULLSOFT_UTILITY_GROWBUF_H
#define NULLSOFT_UTILITY_GROWBUF_H
#include <memory.h>
#include <stdlib.h>
class GrowBuf
{
public:
GrowBuf() {}
~GrowBuf()
{
if ( m_s )
free( m_s );
m_s = NULL;
}
void reserve( size_t len )
{
if ( len > m_alloc )
{
void *ne;
m_alloc = len;
ne = realloc( m_s, m_alloc );
if ( !ne )
{
ne = malloc( m_alloc );
memcpy( ne, m_s, m_used );
free( m_s );
}
m_s = ne;
}
}
size_t add( void *data, size_t len )
{
if ( !len )
return 0;
resize( m_used + len );
memcpy( (char *)get() + m_used - len, data, len );
return m_used - len;
}
void set( void *data, size_t len )
{
resize( len );
memcpy( (char *)get(), data, len );
}
void resize( size_t newlen )
{
m_used = newlen;
if ( newlen > m_alloc )
{
m_alloc = newlen * 2;
if ( m_alloc < 1024 )
m_alloc = 1024;
void *ne = realloc( m_s, m_alloc );
if ( !ne )
{
ne = malloc( m_alloc );
if ( !ne )
*( (char *)ne ) = NULL;
memcpy( ne, m_s, m_used );
free( m_s );
}
m_s = ne;
}
}
size_t getlen()
{
return m_used;
}
void *get()
{
return m_s;
}
private:
void *m_s = NULL;
size_t m_alloc = 0;
size_t m_used = 0;
};
#endif
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