-/*****************************************************************************
- * mem_stream.c: stream_t wrapper around memory buffer
- *****************************************************************************
- * Copyright (C) 1999-2004 the VideoLAN team
- * $Id$
- *
- * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
- *
- * 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.
- *****************************************************************************/
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include <vlc_common.h>
-
-#include "input_internal.h"
-
-struct stream_sys_t
-{
- bool i_preserve_memory;
- int64_t i_pos; /* Current reading offset */
- int64_t i_size;
- uint8_t *p_buffer;
-
-};
-
-static int Read ( stream_t *, void *p_read, unsigned int i_read );
-static int Peek ( stream_t *, const uint8_t **pp_peek, unsigned int i_read );
-static int Control( stream_t *, int i_query, va_list );
-static void Delete ( stream_t * );
-
-/**
- * Create a stream from a memory buffer
- *
- * \param p_this the calling vlc_object
- * \param p_buffer the memory buffer for the stream
- * \param i_buffer the size of the buffer
- * \param i_preserve_memory if this is set to false the memory buffer
- * pointed to by p_buffer is freed on stream_Destroy
- */
-stream_t *__stream_MemoryNew( vlc_object_t *p_this, uint8_t *p_buffer,
- int64_t i_size, bool i_preserve_memory )
-{
- stream_t *s = vlc_stream_create( p_this );
- stream_sys_t *p_sys;
-
- if( !s ) return NULL;
-
- s->p_sys = p_sys = malloc( sizeof( stream_sys_t ) );
- p_sys->i_pos = 0;
- p_sys->i_size = i_size;
- p_sys->p_buffer = p_buffer;
- p_sys->i_preserve_memory = i_preserve_memory;
-
- s->pf_read = Read;
- s->pf_peek = Peek;
- s->pf_control = Control;
- s->pf_destroy = Delete;
-
- s->i_char_width = 1;
- s->b_little_endian = false;
- vlc_object_attach( s, p_this );
-
- return s;
-}
-
-static void Delete( stream_t *s )
-{
- if( !s->p_sys->i_preserve_memory ) free( s->p_sys->p_buffer );
- free( s->p_sys );
- vlc_object_detach( s );
- vlc_object_release( s );
-}
-
-/****************************************************************************
- * AStreamControl:
- ****************************************************************************/
-static int Control( stream_t *s, int i_query, va_list args )
-{
- stream_sys_t *p_sys = s->p_sys;
-
- bool *p_bool;
- int64_t *pi_64, i_64;
- int i_int;
-
- switch( i_query )
- {
- case STREAM_GET_SIZE:
- pi_64 = (int64_t*)va_arg( args, int64_t * );
- *pi_64 = p_sys->i_size;
- break;
-
- case STREAM_CAN_SEEK:
- p_bool = (bool*)va_arg( args, bool * );
- *p_bool = true;
- break;
-
- case STREAM_CAN_FASTSEEK:
- p_bool = (bool*)va_arg( args, bool * );
- *p_bool = true;
- break;
-
- case STREAM_GET_POSITION:
- pi_64 = (int64_t*)va_arg( args, int64_t * );
- *pi_64 = p_sys->i_pos;
- break;
-
- case STREAM_SET_POSITION:
- i_64 = (int64_t)va_arg( args, int64_t );
- i_64 = __MAX( i_64, 0 );
- i_64 = __MIN( i_64, s->p_sys->i_size );
- p_sys->i_pos = i_64;
- break;
-
- case STREAM_GET_MTU:
- case STREAM_GET_CONTENT_TYPE:
- return VLC_EGENERIC;
-
- case STREAM_CONTROL_ACCESS:
- i_int = (int) va_arg( args, int );
- msg_Err( s, "Hey, what are you thinking ?"
- "DON'T USE STREAM_CONTROL_ACCESS !!!" );
- return VLC_EGENERIC;
-
- default:
- msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
-}
-
-static int Read( stream_t *s, void *p_read, unsigned int i_read )
-{
- stream_sys_t *p_sys = s->p_sys;
- int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
- memcpy( p_read, p_sys->p_buffer + p_sys->i_pos, i_res );
- p_sys->i_pos += i_res;
- return i_res;
-}
-
-static int Peek( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
-{
- stream_sys_t *p_sys = s->p_sys;
- int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
- *pp_peek = p_sys->p_buffer + p_sys->i_pos;
- return i_res;
-}