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 *****************************************************************************/
33 /*****************************************************************************
34 * Buffer management functions
35 *****************************************************************************/
36 int var_buffer_initwrite( var_buffer_t *p_buf, int i_default_size )
38 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
40 if( !( p_buf->p_data = malloc( p_buf->i_size ) ) )
47 int var_buffer_reinitwrite( var_buffer_t *p_buf, int i_default_size )
50 if( p_buf->i_size < i_default_size )
52 p_buf->i_size = i_default_size;
55 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 );
71 void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte )
73 /* check if there is enough data */
74 if( p_buf->i_data >= p_buf->i_size )
76 p_buf->i_size += 1024;
77 p_buf->p_data = realloc( p_buf->p_data, p_buf->i_size );
79 p_buf->p_data[p_buf->i_data] = i_byte&0xff;
83 void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
85 var_buffer_add8( p_buf, i_word&0xff );
86 var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
89 void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
91 var_buffer_add16( p_buf, i_dword&0xffff );
92 var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
95 void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
97 var_buffer_add32( p_buf, i_long&0xffffffff );
98 var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
101 void var_buffer_addmemory( var_buffer_t *p_buf, void *p_mem, int i_mem )
103 /* check if there is enough data */
104 if( p_buf->i_data + i_mem >= p_buf->i_size )
106 p_buf->i_size += i_mem + 1024;
107 p_buf->p_data = realloc( p_buf->p_data, p_buf->i_size );
110 memcpy( p_buf->p_data + p_buf->i_data,
113 p_buf->i_data += i_mem;
116 void var_buffer_addUTF16( var_buffer_t *p_buf, const char *p_str )
121 var_buffer_add16( p_buf, 0 );
125 vlc_iconv_t iconv_handle;
126 size_t i_in = strlen( p_str );
127 size_t i_out = i_in * 4;
128 char *psz_out, *psz_tmp;
130 psz_out = psz_tmp = malloc( i_out + 1 );
131 iconv_handle = vlc_iconv_open( "UTF-16LE", "UTF-8" );
132 vlc_iconv( iconv_handle, &p_str, &i_in, &psz_tmp, &i_out );
133 vlc_iconv_close( iconv_handle );
137 for( i = 0; ; i += 2 )
139 uint16_t v = GetWLE( &psz_out[i] );
140 var_buffer_add16( p_buf, v );
148 void var_buffer_free( var_buffer_t *p_buf )
152 free( p_buf->p_data );
158 void var_buffer_initread( var_buffer_t *p_buf, void *p_data, int i_data )
160 p_buf->i_size = i_data;
162 p_buf->p_data = p_data;
165 uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
168 if( p_buf->i_data >= p_buf->i_size )
172 i_byte = p_buf->p_data[p_buf->i_data];
177 uint16_t var_buffer_get16( var_buffer_t *p_buf )
181 i_b1 = var_buffer_get8( p_buf );
182 i_b2 = var_buffer_get8( p_buf );
184 return( i_b1 + ( i_b2 << 8 ) );
188 uint32_t var_buffer_get32( var_buffer_t *p_buf )
192 i_w1 = var_buffer_get16( p_buf );
193 i_w2 = var_buffer_get16( p_buf );
195 return( i_w1 + ( i_w2 << 16 ) );
198 uint64_t var_buffer_get64( var_buffer_t *p_buf )
200 uint64_t i_dw1, i_dw2;
202 i_dw1 = var_buffer_get32( p_buf );
203 i_dw2 = var_buffer_get32( p_buf );
205 return( i_dw1 + ( i_dw2 << 32 ) );
208 int var_buffer_getmemory ( var_buffer_t *p_buf, void *p_mem, int64_t i_mem )
212 i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
213 if( i_copy > 0 && p_mem != NULL)
215 memcpy( p_mem, p_buf + p_buf->i_data, i_copy );
221 p_buf->i_data += i_copy;
225 int var_buffer_readempty( var_buffer_t *p_buf )
227 return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
230 void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
234 p_guid->v1 = var_buffer_get32( p_buf );
235 p_guid->v2 = var_buffer_get16( p_buf );
236 p_guid->v3 = var_buffer_get16( p_buf );
238 for( i = 0; i < 8; i++ )
240 p_guid->v4[i] = var_buffer_get8( p_buf );