root/src/input/mem_stream.c

Revision 7979cfc5c6385aa79ddfa6cd357a7332a11de612, 4.8 kB (checked in by Pierre d'Herbemont <pdherbemont@videolan.org>, 4 months ago)

input: Fix signed warnings about streams.

  • Property mode set to 100644
Line 
1 /*****************************************************************************
2  * mem_stream.c: stream_t wrapper around memory buffer
3  *****************************************************************************
4  * Copyright (C) 1999-2004 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Sigmund Augdal Helberg <dnumgis@videolan.org>
8  *
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.
13  *
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.
18  *
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  *****************************************************************************/
23
24 #ifdef HAVE_CONFIG_H
25 # include "config.h"
26 #endif
27
28 #include <vlc_common.h>
29
30 #include "input_internal.h"
31
32 struct stream_sys_t
33 {
34     bool  i_preserve_memory;
35     int64_t     i_pos;      /* Current reading offset */
36     int64_t     i_size;
37     uint8_t    *p_buffer;
38
39 };
40
41 static int  Read   ( stream_t *, void *p_read, unsigned int i_read );
42 static int  Peek   ( stream_t *, const uint8_t **pp_peek, unsigned int i_read );
43 static int  Control( stream_t *, int i_query, va_list );
44 static void Delete ( stream_t * );
45
46 /**
47  * Create a stream from a memory buffer
48  *
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
54  */
55 stream_t *__stream_MemoryNew( vlc_object_t *p_this, uint8_t *p_buffer,
56                               int64_t i_size, bool i_preserve_memory )
57 {
58     stream_t *s = vlc_stream_create( p_this );
59     stream_sys_t *p_sys;
60
61     if( !s ) return NULL;
62
63     s->p_sys = p_sys = malloc( sizeof( stream_sys_t ) );
64     p_sys->i_pos = 0;
65     p_sys->i_size = i_size;
66     p_sys->p_buffer = p_buffer;
67     p_sys->i_preserve_memory = i_preserve_memory;
68
69     s->pf_read    = Read;
70     s->pf_peek    = Peek;
71     s->pf_control = Control;
72     s->pf_destroy = Delete;
73
74     s->i_char_width = 1;
75     s->b_little_endian = false;
76     vlc_object_attach( s, p_this );
77
78     return s;
79 }
80
81 static void Delete( stream_t *s )
82 {
83     if( !s->p_sys->i_preserve_memory ) free( s->p_sys->p_buffer );
84     free( s->p_sys );
85     vlc_object_detach( s );
86     vlc_object_release( s );
87 }
88
89 /****************************************************************************
90  * AStreamControl:
91  ****************************************************************************/
92 static int Control( stream_t *s, int i_query, va_list args )
93 {
94     stream_sys_t *p_sys = s->p_sys;
95
96     bool *p_bool;
97     int64_t    *pi_64, i_64;
98     int        i_int;
99
100     switch( i_query )
101     {
102         case STREAM_GET_SIZE:
103             pi_64 = (int64_t*)va_arg( args, int64_t * );
104             *pi_64 = p_sys->i_size;
105             break;
106
107         case STREAM_CAN_SEEK:
108             p_bool = (bool*)va_arg( args, bool * );
109             *p_bool = true;
110             break;
111
112         case STREAM_CAN_FASTSEEK:
113             p_bool = (bool*)va_arg( args, bool * );
114             *p_bool = true;
115             break;
116
117         case STREAM_GET_POSITION:
118             pi_64 = (int64_t*)va_arg( args, int64_t * );
119             *pi_64 = p_sys->i_pos;
120             break;
121
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 );
126             p_sys->i_pos = i_64;
127             break;
128
129         case STREAM_GET_MTU:
130         case STREAM_GET_CONTENT_TYPE:
131             return VLC_EGENERIC;
132
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 !!!" );
137             return VLC_EGENERIC;
138
139         default:
140             msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
141             return VLC_EGENERIC;
142     }
143     return VLC_SUCCESS;
144 }
145
146 static int Read( stream_t *s, void *p_read, unsigned int i_read )
147 {
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;
152     return i_res;
153 }
154
155 static int Peek( stream_t *s, const uint8_t **pp_peek, unsigned int i_read )
156 {
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;
160     return i_res;
161 }
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