1 /*****************************************************************************
2 * buffer.c: MMS access plug-in
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: buffer.c,v 1.1 2002/11/22 18:35:57 sam Exp $
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
34 /*****************************************************************************
35 * Buffer management functions
36 *****************************************************************************/
38 int var_buffer_initwrite( var_buffer_t *p_buf, int i_default_size )
40 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
42 if( !( p_buf->p_data = malloc( p_buf->i_size ) ) )
49 int var_buffer_reinitwrite( var_buffer_t *p_buf, int i_default_size )
52 if( p_buf->i_size < i_default_size )
54 p_buf->i_size = i_default_size;
57 free( p_buf->p_data );
59 p_buf->p_data = malloc( p_buf->i_size );
63 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
64 p_buf->p_data = malloc( p_buf->i_size );
73 void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte )
75 /* check if there is enough data */
76 if( p_buf->i_data >= p_buf->i_size )
78 p_buf->i_size += 1024;
79 p_buf->p_data = realloc( p_buf->p_data, p_buf->i_size );
81 p_buf->p_data[p_buf->i_data] = i_byte&0xff;
85 void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
87 var_buffer_add8( p_buf, i_word&0xff );
88 var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
91 void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
93 var_buffer_add16( p_buf, i_dword&0xffff );
94 var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
97 void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
99 var_buffer_add32( p_buf, i_long&0xffffffff );
100 var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
104 void var_buffer_addmemory( var_buffer_t *p_buf, void *p_mem, int i_mem )
106 /* check if there is enough data */
107 if( p_buf->i_data + i_mem >= p_buf->i_size )
109 p_buf->i_size += i_mem + 1024;
110 p_buf->p_data = realloc( p_buf->p_data, p_buf->i_size );
113 memcpy( p_buf->p_data + p_buf->i_data,
116 p_buf->i_data += i_mem;
119 void var_buffer_addUTF16( var_buffer_t *p_buf, char *p_str )
124 var_buffer_add16( p_buf, 0 );
128 for( i = 0; i < strlen( p_str ) + 1; i++ ) // and 0
130 var_buffer_add16( p_buf, p_str[i] );
135 void var_buffer_free( var_buffer_t *p_buf )
139 free( p_buf->p_data );
145 void var_buffer_initread( var_buffer_t *p_buf, void *p_data, int i_data )
147 p_buf->i_size = i_data;
149 p_buf->p_data = p_data;
152 uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
155 if( p_buf->i_data >= p_buf->i_size )
159 i_byte = p_buf->p_data[p_buf->i_data];
165 uint16_t var_buffer_get16( var_buffer_t *p_buf )
169 i_b1 = var_buffer_get8( p_buf );
170 i_b2 = var_buffer_get8( p_buf );
172 return( i_b1 + ( i_b2 << 8 ) );
176 uint32_t var_buffer_get32( var_buffer_t *p_buf )
180 i_w1 = var_buffer_get16( p_buf );
181 i_w2 = var_buffer_get16( p_buf );
183 return( i_w1 + ( i_w2 << 16 ) );
186 uint64_t var_buffer_get64( var_buffer_t *p_buf )
188 uint64_t i_dw1, i_dw2;
190 i_dw1 = var_buffer_get32( p_buf );
191 i_dw2 = var_buffer_get32( p_buf );
193 return( i_dw1 + ( i_dw2 << 32 ) );
196 int var_buffer_getmemory ( var_buffer_t *p_buf, void *p_mem, int i_mem )
200 i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
201 if( i_copy > 0 && p_mem != NULL)
203 memcpy( p_mem, p_buf + p_buf->i_data, i_copy );
205 p_buf->i_data += i_copy;
209 int var_buffer_readempty( var_buffer_t *p_buf )
211 return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
214 void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
218 p_guid->v1 = var_buffer_get32( p_buf );
219 p_guid->v2 = var_buffer_get16( p_buf );
220 p_guid->v3 = var_buffer_get16( p_buf );
222 for( i = 0; i < 8; i++ )
224 p_guid->v4[i] = var_buffer_get8( p_buf );