1 /*****************************************************************************
2 * mem_stream.c: stream_t wrapper around memory buffer
3 *****************************************************************************
4 * Copyright (C) 1999-2004 the VideoLAN team
7 * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
26 #include "input_internal.h"
30 vlc_bool_t i_preserve_memory;
31 int64_t i_pos; /* Current reading offset */
37 static int Read ( stream_t *, void *p_read, int i_read );
38 static int Peek ( stream_t *, const uint8_t **pp_peek, int i_read );
39 static int Control( stream_t *, int i_query, va_list );
40 static void Delete ( stream_t * );
43 * Create a stream from a memory buffer
45 * \param p_this the calling vlc_object
46 * \param p_buffer the memory buffer for the stream
47 * \param i_buffer the size of the buffer
48 * \param i_preserve_memory if this is set to VLC_FALSE the memory buffer
49 * pointed to by p_buffer is freed on stream_Destroy
51 stream_t *__stream_MemoryNew( vlc_object_t *p_this, uint8_t *p_buffer,
52 int64_t i_size, vlc_bool_t i_preserve_memory )
54 stream_t *s = vlc_stream_create( p_this );
59 s->p_sys = p_sys = malloc( sizeof( stream_sys_t ) );
61 p_sys->i_size = i_size;
62 p_sys->p_buffer = p_buffer;
63 p_sys->i_preserve_memory = i_preserve_memory;
67 s->pf_control = Control;
68 s->pf_destroy = Delete;
71 s->b_little_endian = VLC_FALSE;
72 vlc_object_attach( s, p_this );
77 static void Delete( stream_t *s )
79 if( !s->p_sys->i_preserve_memory ) free( s->p_sys->p_buffer );
81 vlc_object_detach( s );
82 vlc_object_destroy( s );
85 /****************************************************************************
87 ****************************************************************************/
88 static int Control( stream_t *s, int i_query, va_list args )
90 stream_sys_t *p_sys = s->p_sys;
99 pi_64 = (int64_t*)va_arg( args, int64_t * );
100 *pi_64 = p_sys->i_size;
103 case STREAM_CAN_SEEK:
104 p_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
108 case STREAM_CAN_FASTSEEK:
109 p_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
113 case STREAM_GET_POSITION:
114 pi_64 = (int64_t*)va_arg( args, int64_t * );
115 *pi_64 = p_sys->i_pos;
118 case STREAM_SET_POSITION:
119 i_64 = (int64_t)va_arg( args, int64_t );
120 i_64 = __MAX( i_64, 0 );
121 i_64 = __MIN( i_64, s->p_sys->i_size );
128 case STREAM_CONTROL_ACCESS:
129 i_int = (int) va_arg( args, int );
130 msg_Err( s, "Hey, what are you thinking ?"
131 "DON'T USE STREAM_CONTROL_ACCESS !!!" );
135 msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
141 static int Read( stream_t *s, void *p_read, int i_read )
143 stream_sys_t *p_sys = s->p_sys;
144 int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
145 memcpy( p_read, p_sys->p_buffer + p_sys->i_pos, i_res );
146 p_sys->i_pos += i_res;
150 static int Peek( stream_t *s, const uint8_t **pp_peek, int i_read )
152 stream_sys_t *p_sys = s->p_sys;
153 int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
154 *pp_peek = p_sys->p_buffer + p_sys->i_pos;