1 /*****************************************************************************
2 * var_buffer.h: MMS access plug-in
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: var_buffer.h,v 1.1 2002/11/12 00:54:40 fenrir 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 typedef struct var_buffer_s
26 uint8_t *p_data; // pointer on data
27 int i_data; // number of bytes set in p_data
30 int i_size; // size of p_data memory allocated
34 /*****************************************************************************
35 * Macro/Function to create/manipulate buffer
36 *****************************************************************************/
37 static inline int var_buffer_initwrite( var_buffer_t *p_buf,
39 static inline int var_buffer_reinitwrite( var_buffer_t *p_buf,
41 static inline void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte );
42 static inline void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word );
43 static inline void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_word );
44 static inline void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_word );
45 static inline void var_buffer_addmemory( var_buffer_t *p_buf,
46 void *p_mem, int i_mem );
47 static inline void var_buffer_addUTF16( var_buffer_t *p_buf, char *p_str );
48 static inline void var_buffer_free( var_buffer_t *p_buf );
51 static inline void var_buffer_initread( var_buffer_t *p_buf,
52 void *p_data, int i_data );
53 static inline uint8_t var_buffer_get8 ( var_buffer_t *p_buf );
54 static inline uint16_t var_buffer_get16( var_buffer_t *p_buf );
55 static inline uint32_t var_buffer_get32( var_buffer_t *p_buf );
56 static inline uint64_t var_buffer_get64( var_buffer_t *p_buf );
57 static inline int var_buffer_getmemory ( var_buffer_t *p_buf,
58 void *p_mem, int i_mem );
59 static inline int var_buffer_readempty( var_buffer_t *p_buf );
60 static inline void var_buffer_getguid( var_buffer_t *p_buf,
65 /*****************************************************************************
66 *****************************************************************************/
68 static inline int var_buffer_initwrite( var_buffer_t *p_buf,
71 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
73 if( !( p_buf->p_data = malloc( p_buf->i_size ) ) )
79 static inline int var_buffer_reinitwrite( var_buffer_t *p_buf,
83 if( p_buf->i_size < i_default_size )
85 p_buf->i_size = i_default_size;
88 free( p_buf->p_data );
90 p_buf->p_data = malloc( p_buf->i_size );
94 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
95 p_buf->p_data = malloc( p_buf->i_size );
104 static inline void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte )
106 /* check if there is enough data */
107 if( p_buf->i_data >= p_buf->i_size )
109 p_buf->i_size += 1024;
110 p_buf->p_data = realloc( p_buf->p_data, p_buf->i_size );
112 p_buf->p_data[p_buf->i_data] = i_byte&0xff;
116 static inline void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
118 var_buffer_add8( p_buf, i_word&0xff );
119 var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
121 static inline void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
123 var_buffer_add16( p_buf, i_dword&0xffff );
124 var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
126 static inline void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
128 var_buffer_add32( p_buf, i_long&0xffffffff );
129 var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
133 static inline void var_buffer_addmemory( var_buffer_t *p_buf,
134 void *p_mem, int i_mem )
136 /* check if there is enough data */
137 if( p_buf->i_data + i_mem >= p_buf->i_size )
139 p_buf->i_size += i_mem + 1024;
140 p_buf->p_data = realloc( p_buf->p_data, p_buf->i_size );
143 memcpy( p_buf->p_data + p_buf->i_data,
146 p_buf->i_data += i_mem;
149 static inline void var_buffer_addUTF16( var_buffer_t *p_buf, char *p_str )
154 var_buffer_add16( p_buf, 0 );
158 for( i = 0; i < strlen( p_str ) + 1; i++ ) // and 0
160 var_buffer_add16( p_buf, p_str[i] );
165 static inline void var_buffer_free( var_buffer_t *p_buf )
169 free( p_buf->p_data );
175 static inline void var_buffer_initread( var_buffer_t *p_buf,
176 void *p_data, int i_data )
178 p_buf->i_size = i_data;
180 p_buf->p_data = p_data;
183 static inline uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
186 if( p_buf->i_data >= p_buf->i_size )
190 i_byte = p_buf->p_data[p_buf->i_data];
196 static inline uint16_t var_buffer_get16( var_buffer_t *p_buf )
200 i_b1 = var_buffer_get8( p_buf );
201 i_b2 = var_buffer_get8( p_buf );
203 return( i_b1 + ( i_b2 << 8 ) );
206 static inline uint32_t var_buffer_get32( var_buffer_t *p_buf )
210 i_w1 = var_buffer_get16( p_buf );
211 i_w2 = var_buffer_get16( p_buf );
213 return( i_w1 + ( i_w2 << 16 ) );
215 static inline uint64_t var_buffer_get64( var_buffer_t *p_buf )
217 uint64_t i_dw1, i_dw2;
219 i_dw1 = var_buffer_get32( p_buf );
220 i_dw2 = var_buffer_get32( p_buf );
222 return( i_dw1 + ( i_dw2 << 32 ) );
224 static inline int var_buffer_getmemory ( var_buffer_t *p_buf,
225 void *p_mem, int i_mem )
229 i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
230 if( i_copy > 0 && p_mem != NULL)
232 memcpy( p_mem, p_buf + p_buf->i_data, i_copy );
234 p_buf->i_data += i_copy;
238 static inline int var_buffer_readempty( var_buffer_t *p_buf )
240 return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
243 static inline void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
247 p_guid->v1 = var_buffer_get32( p_buf );
248 p_guid->v2 = var_buffer_get16( p_buf );
249 p_guid->v3 = var_buffer_get16( p_buf );
251 for( i = 0; i < 8; i++ )
253 p_guid->v4[i] = var_buffer_get8( p_buf );