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/* buffer.c: Self-inflating buffer. Trivial class for convenient storing of
arbitrary data.
Copyright (c) 2016-2017 Fredrick Meunier
Based on buffer.h from pzxtools.
Copyright (C) 2007 Patrik Rak (patrik@raxoft.cz)
The buffer.h source code is released under the MIT license, see included
buffer_license.txt.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: fredm@spamcop.net
*/
#include "config.h"
#include <string.h>
#include "internals.h"
struct libspectrum_buffer {
libspectrum_byte* buffer;
size_t buffer_size;
size_t bytes_used;
};
void
libspectrum_buffer_reallocate( libspectrum_buffer *buffer,
const size_t new_size )
{
buffer->buffer = libspectrum_realloc( buffer->buffer, new_size );
buffer->buffer_size = new_size;
}
libspectrum_buffer*
libspectrum_buffer_alloc( void )
{
libspectrum_buffer *buffer = libspectrum_new( libspectrum_buffer, 1 );
buffer->buffer = NULL;
buffer->buffer_size = 0;
buffer->bytes_used = 0;
libspectrum_buffer_reallocate( buffer, 65536 );
return buffer;
}
void
libspectrum_buffer_free( libspectrum_buffer *buffer )
{
libspectrum_free( buffer->buffer );
buffer->buffer = NULL;
buffer->buffer_size = 0;
buffer->bytes_used = 0;
libspectrum_free( buffer );
}
int
libspectrum_buffer_is_empty( const libspectrum_buffer *buffer )
{
return buffer->bytes_used == 0;
}
int
libspectrum_buffer_is_not_empty( const libspectrum_buffer *buffer )
{
return buffer->bytes_used > 0;
}
void
libspectrum_buffer_write_byte( libspectrum_buffer *buffer,
const libspectrum_byte data )
{
libspectrum_buffer_write( buffer, &data, sizeof( libspectrum_byte ) ) ;
}
void
libspectrum_buffer_write_word( libspectrum_buffer *buffer,
const libspectrum_word data )
{
libspectrum_word lsb_data;
libspectrum_byte* lsb_data_ptr = (libspectrum_byte*)&lsb_data;
libspectrum_write_word( &lsb_data_ptr, data );
libspectrum_buffer_write( buffer, &lsb_data, sizeof( libspectrum_word ) ) ;
}
void
libspectrum_buffer_write_dword( libspectrum_buffer *buffer,
const libspectrum_dword data )
{
libspectrum_dword lsb_data;
libspectrum_byte* lsb_data_ptr = (libspectrum_byte*)&lsb_data;
libspectrum_write_dword( &lsb_data_ptr, data );
libspectrum_buffer_write( buffer, &lsb_data, sizeof( libspectrum_dword ) ) ;
}
void
libspectrum_buffer_write_buffer( libspectrum_buffer *dest,
const libspectrum_buffer *src )
{
if( src ) libspectrum_buffer_write( dest, src->buffer, src->bytes_used );
}
static void
reallocate_to_new_size( libspectrum_buffer *buffer, const size_t size )
{
while ( size > buffer->buffer_size - buffer->bytes_used ) {
libspectrum_buffer_reallocate( buffer, 2 * buffer->buffer_size );
}
}
void
libspectrum_buffer_write( libspectrum_buffer *buffer, const void* data,
const size_t size )
{
reallocate_to_new_size( buffer, size );
memcpy( buffer->buffer + buffer->bytes_used, data, size );
buffer->bytes_used += size;
}
void
libspectrum_buffer_set( libspectrum_buffer *buffer, libspectrum_byte value,
const size_t size )
{
reallocate_to_new_size( buffer, size );
memset( buffer->buffer + buffer->bytes_used, value, size );
buffer->bytes_used += size;
}
size_t
libspectrum_buffer_get_data_size( const libspectrum_buffer *buffer )
{
return buffer ? buffer->bytes_used : 0;
}
libspectrum_byte*
libspectrum_buffer_get_data( const libspectrum_buffer *buffer )
{
return buffer ? buffer->buffer : NULL;
}
void
libspectrum_buffer_clear( libspectrum_buffer *buffer )
{
if( buffer ) buffer->bytes_used = 0;
}
void
libspectrum_buffer_append( libspectrum_byte **buffer, size_t *length,
libspectrum_byte **ptr,
const libspectrum_buffer *src )
{
if( !src->bytes_used ) return;
libspectrum_make_room( buffer, src->bytes_used, ptr, length );
memcpy( *ptr, src->buffer, src->bytes_used );
*ptr += src->bytes_used;
}
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