1 /*****************************************************************************
2 * buffer.c: MMS access plug-in
3 *****************************************************************************
4 * Copyright (C) 2001-2004 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
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 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_access.h>
34 #include <vlc_charset.h>
39 /*****************************************************************************
40 * Buffer management functions
41 *****************************************************************************/
42 int var_buffer_initwrite( var_buffer_t *p_buf, int i_default_size )
44 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
46 p_buf->p_data = malloc( p_buf->i_size );
47 return p_buf->p_data ? 0 : -1;
50 int var_buffer_reinitwrite( var_buffer_t *p_buf, int i_default_size )
53 if( p_buf->i_size < i_default_size )
55 p_buf->i_size = i_default_size;
56 free( p_buf->p_data );
57 p_buf->p_data = malloc( p_buf->i_size );
61 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
62 p_buf->p_data = malloc( p_buf->i_size );
64 return p_buf->p_data ? 0 : -1;
67 void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte )
69 /* check if there is enough data */
70 if( p_buf->i_data >= p_buf->i_size )
72 p_buf->i_size += 1024;
73 p_buf->p_data = xrealloc( p_buf->p_data, p_buf->i_size );
75 p_buf->p_data[p_buf->i_data] = i_byte&0xff;
79 void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
81 var_buffer_add8( p_buf, i_word&0xff );
82 var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
85 void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
87 var_buffer_add16( p_buf, i_dword&0xffff );
88 var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
91 void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
93 var_buffer_add32( p_buf, i_long&0xffffffff );
94 var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
97 void var_buffer_addmemory( var_buffer_t *p_buf, void *p_mem, int i_mem )
99 /* check if there is enough data */
100 if( p_buf->i_data + i_mem >= p_buf->i_size )
102 p_buf->i_size += i_mem + 1024;
103 p_buf->p_data = xrealloc( p_buf->p_data, p_buf->i_size );
106 memcpy( p_buf->p_data + p_buf->i_data, p_mem, i_mem );
107 p_buf->i_data += i_mem;
110 void var_buffer_addUTF16( access_t *p_access, var_buffer_t *p_buf, const char *p_str )
116 #ifdef WORDS_BIGENDIAN
117 p_out = ToCharset( "UTF-16BE", p_str, &i_out );
119 p_out = ToCharset( "UTF-16LE", p_str, &i_out );
125 msg_Err( p_access, "UTF-16 conversion failed" );
130 for( size_t i = 0; i < i_out; i ++ )
131 var_buffer_add16( p_buf, p_out[i] );
134 var_buffer_add16( p_buf, 0 );
137 void var_buffer_free( var_buffer_t *p_buf )
139 free( p_buf->p_data );
144 void var_buffer_initread( var_buffer_t *p_buf, void *p_data, int i_data )
146 p_buf->i_size = i_data;
148 p_buf->p_data = p_data;
151 uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
154 if( p_buf->i_data >= p_buf->i_size )
158 i_byte = p_buf->p_data[p_buf->i_data];
163 uint16_t var_buffer_get16( var_buffer_t *p_buf )
167 i_b1 = var_buffer_get8( p_buf );
168 i_b2 = var_buffer_get8( p_buf );
170 return( i_b1 + ( i_b2 << 8 ) );
174 uint32_t var_buffer_get32( var_buffer_t *p_buf )
178 i_w1 = var_buffer_get16( p_buf );
179 i_w2 = var_buffer_get16( p_buf );
181 return( i_w1 + ( i_w2 << 16 ) );
184 uint64_t var_buffer_get64( var_buffer_t *p_buf )
186 uint64_t i_dw1, i_dw2;
188 i_dw1 = var_buffer_get32( p_buf );
189 i_dw2 = var_buffer_get32( p_buf );
191 return( i_dw1 + ( i_dw2 << 32 ) );
194 int var_buffer_getmemory ( var_buffer_t *p_buf, void *p_mem, int64_t i_mem )
198 i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
199 if( i_copy > 0 && p_mem != NULL)
201 memcpy( p_mem, p_buf + p_buf->i_data, i_copy );
207 p_buf->i_data += i_copy;
211 int var_buffer_readempty( var_buffer_t *p_buf )
213 return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
216 void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
220 p_guid->Data1 = var_buffer_get32( p_buf );
221 p_guid->Data2 = var_buffer_get16( p_buf );
222 p_guid->Data3 = var_buffer_get16( p_buf );
224 for( i = 0; i < 8; i++ )
226 p_guid->Data4[i] = var_buffer_get8( p_buf );