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>
37 /*****************************************************************************
38 * Buffer management functions
39 *****************************************************************************/
40 int var_buffer_initwrite( var_buffer_t *p_buf, int i_default_size )
42 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
44 p_buf->p_data = malloc( p_buf->i_size );
45 return p_buf->p_data ? 0 : -1;
48 int var_buffer_reinitwrite( var_buffer_t *p_buf, int i_default_size )
51 if( p_buf->i_size < i_default_size )
53 p_buf->i_size = i_default_size;
54 free( p_buf->p_data );
55 p_buf->p_data = malloc( p_buf->i_size );
59 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
60 p_buf->p_data = malloc( p_buf->i_size );
62 return p_buf->p_data ? 0 : -1;
65 void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte )
67 /* check if there is enough data */
68 if( p_buf->i_data >= p_buf->i_size )
70 p_buf->i_size += 1024;
71 p_buf->p_data = xrealloc( p_buf->p_data, p_buf->i_size );
73 p_buf->p_data[p_buf->i_data] = i_byte&0xff;
77 void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
79 var_buffer_add8( p_buf, i_word&0xff );
80 var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
83 void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
85 var_buffer_add16( p_buf, i_dword&0xffff );
86 var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
89 void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
91 var_buffer_add32( p_buf, i_long&0xffffffff );
92 var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
95 void var_buffer_addmemory( var_buffer_t *p_buf, void *p_mem, int i_mem )
97 /* check if there is enough data */
98 if( p_buf->i_data + i_mem >= p_buf->i_size )
100 p_buf->i_size += i_mem + 1024;
101 p_buf->p_data = xrealloc( p_buf->p_data, p_buf->i_size );
104 memcpy( p_buf->p_data + p_buf->i_data, p_mem, i_mem );
105 p_buf->i_data += i_mem;
108 void var_buffer_addUTF16( var_buffer_t *p_buf, const char *p_str )
113 var_buffer_add16( p_buf, 0 );
117 vlc_iconv_t iconv_handle;
118 size_t i_in = strlen( p_str );
119 size_t i_out = i_in * 4;
120 char *psz_out, *psz_tmp;
122 psz_out = psz_tmp = xmalloc( i_out + 1 );
123 iconv_handle = vlc_iconv_open( "UTF-16LE", "UTF-8" );
124 vlc_iconv( iconv_handle, &p_str, &i_in, &psz_tmp, &i_out );
125 vlc_iconv_close( iconv_handle );
129 for( i = 0; ; i += 2 )
131 uint16_t v = GetWLE( &psz_out[i] );
132 var_buffer_add16( p_buf, v );
140 void var_buffer_free( var_buffer_t *p_buf )
142 free( p_buf->p_data );
147 void var_buffer_initread( var_buffer_t *p_buf, void *p_data, int i_data )
149 p_buf->i_size = i_data;
151 p_buf->p_data = p_data;
154 uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
157 if( p_buf->i_data >= p_buf->i_size )
161 i_byte = p_buf->p_data[p_buf->i_data];
166 uint16_t var_buffer_get16( var_buffer_t *p_buf )
170 i_b1 = var_buffer_get8( p_buf );
171 i_b2 = var_buffer_get8( p_buf );
173 return( i_b1 + ( i_b2 << 8 ) );
177 uint32_t var_buffer_get32( var_buffer_t *p_buf )
181 i_w1 = var_buffer_get16( p_buf );
182 i_w2 = var_buffer_get16( p_buf );
184 return( i_w1 + ( i_w2 << 16 ) );
187 uint64_t var_buffer_get64( var_buffer_t *p_buf )
189 uint64_t i_dw1, i_dw2;
191 i_dw1 = var_buffer_get32( p_buf );
192 i_dw2 = var_buffer_get32( p_buf );
194 return( i_dw1 + ( i_dw2 << 32 ) );
197 int var_buffer_getmemory ( var_buffer_t *p_buf, void *p_mem, int64_t i_mem )
201 i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
202 if( i_copy > 0 && p_mem != NULL)
204 memcpy( p_mem, p_buf + p_buf->i_data, i_copy );
210 p_buf->i_data += i_copy;
214 int var_buffer_readempty( var_buffer_t *p_buf )
216 return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
219 void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
223 p_guid->v1 = var_buffer_get32( p_buf );
224 p_guid->v2 = var_buffer_get16( p_buf );
225 p_guid->v3 = var_buffer_get16( p_buf );
227 for( i = 0; i < 8; i++ )
229 p_guid->v4[i] = var_buffer_get8( p_buf );