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 *****************************************************************************/
30 #include "input_internal.h"
34 bool i_preserve_memory;
35 int64_t i_pos; /* Current reading offset */
41 static int Read ( stream_t *, void *p_read, int i_read );
42 static int Peek ( stream_t *, const uint8_t **pp_peek, int i_read );
43 static int Control( stream_t *, int i_query, va_list );
44 static void Delete ( stream_t * );
47 * Create a stream from a memory buffer
49 * \param p_this the calling vlc_object
50 * \param p_buffer the memory buffer for the stream
51 * \param i_buffer the size of the buffer
52 * \param i_preserve_memory if this is set to false the memory buffer
53 * pointed to by p_buffer is freed on stream_Destroy
55 stream_t *__stream_MemoryNew( vlc_object_t *p_this, uint8_t *p_buffer,
56 int64_t i_size, bool i_preserve_memory )
58 stream_t *s = vlc_stream_create( p_this );
63 s->p_sys = p_sys = malloc( sizeof( stream_sys_t ) );
65 p_sys->i_size = i_size;
66 p_sys->p_buffer = p_buffer;
67 p_sys->i_preserve_memory = i_preserve_memory;
71 s->pf_control = Control;
72 s->pf_destroy = Delete;
75 s->b_little_endian = false;
76 vlc_object_attach( s, p_this );
81 static void Delete( stream_t *s )
83 if( !s->p_sys->i_preserve_memory ) free( s->p_sys->p_buffer );
85 vlc_object_detach( s );
86 vlc_object_release( s );
89 /****************************************************************************
91 ****************************************************************************/
92 static int Control( stream_t *s, int i_query, va_list args )
94 stream_sys_t *p_sys = s->p_sys;
102 case STREAM_GET_SIZE:
103 pi_64 = (int64_t*)va_arg( args, int64_t * );
104 *pi_64 = p_sys->i_size;
107 case STREAM_CAN_SEEK:
108 p_bool = (bool*)va_arg( args, bool * );
112 case STREAM_CAN_FASTSEEK:
113 p_bool = (bool*)va_arg( args, bool * );
117 case STREAM_GET_POSITION:
118 pi_64 = (int64_t*)va_arg( args, int64_t * );
119 *pi_64 = p_sys->i_pos;
122 case STREAM_SET_POSITION:
123 i_64 = (int64_t)va_arg( args, int64_t );
124 i_64 = __MAX( i_64, 0 );
125 i_64 = __MIN( i_64, s->p_sys->i_size );
130 case STREAM_GET_CONTENT_TYPE:
133 case STREAM_CONTROL_ACCESS:
134 i_int = (int) va_arg( args, int );
135 msg_Err( s, "Hey, what are you thinking ?"
136 "DON'T USE STREAM_CONTROL_ACCESS !!!" );
140 msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
146 static int Read( stream_t *s, void *p_read, int i_read )
148 stream_sys_t *p_sys = s->p_sys;
149 int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
150 memcpy( p_read, p_sys->p_buffer + p_sys->i_pos, i_res );
151 p_sys->i_pos += i_res;
155 static int Peek( stream_t *s, const uint8_t **pp_peek, int i_read )
157 stream_sys_t *p_sys = s->p_sys;
158 int i_res = __MIN( i_read, p_sys->i_size - p_sys->i_pos );
159 *pp_peek = p_sys->p_buffer + p_sys->i_pos;