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 *****************************************************************************/
34 #include <vlc_common.h>
35 #include <vlc_memory.h>
40 /*****************************************************************************
41 * Buffer management functions
42 *****************************************************************************/
43 int var_buffer_initwrite( var_buffer_t *p_buf, int i_default_size )
45 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
47 p_buf->p_data = malloc( p_buf->i_size );
48 return p_buf->p_data ? 0 : -1;
51 int var_buffer_reinitwrite( var_buffer_t *p_buf, int i_default_size )
54 if( p_buf->i_size < i_default_size )
56 p_buf->i_size = i_default_size;
57 free( p_buf->p_data );
58 p_buf->p_data = malloc( p_buf->i_size );
62 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
63 p_buf->p_data = malloc( p_buf->i_size );
65 return p_buf->p_data ? 0 : -1;
68 void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte )
70 /* check if there is enough data */
71 if( p_buf->i_data >= p_buf->i_size )
73 p_buf->i_size += 1024;
74 p_buf->p_data = realloc_or_free( p_buf->p_data, p_buf->i_size );
75 assert( p_buf->p_data );
77 p_buf->p_data[p_buf->i_data] = i_byte&0xff;
81 void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
83 var_buffer_add8( p_buf, i_word&0xff );
84 var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
87 void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
89 var_buffer_add16( p_buf, i_dword&0xffff );
90 var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
93 void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
95 var_buffer_add32( p_buf, i_long&0xffffffff );
96 var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
99 void var_buffer_addmemory( var_buffer_t *p_buf, void *p_mem, int i_mem )
101 /* check if there is enough data */
102 if( p_buf->i_data + i_mem >= p_buf->i_size )
104 p_buf->i_size += i_mem + 1024;
105 p_buf->p_data = realloc_or_free( p_buf->p_data, p_buf->i_size );
106 assert( p_buf->p_data );
109 memcpy( p_buf->p_data + p_buf->i_data, p_mem, i_mem );
110 p_buf->i_data += i_mem;
113 void var_buffer_addUTF16( var_buffer_t *p_buf, const char *p_str )
118 var_buffer_add16( p_buf, 0 );
122 vlc_iconv_t iconv_handle;
123 size_t i_in = strlen( p_str );
124 size_t i_out = i_in * 4;
125 char *psz_out, *psz_tmp;
127 psz_out = psz_tmp = malloc( i_out + 1 );
129 iconv_handle = vlc_iconv_open( "UTF-16LE", "UTF-8" );
130 vlc_iconv( iconv_handle, &p_str, &i_in, &psz_tmp, &i_out );
131 vlc_iconv_close( iconv_handle );
135 for( i = 0; ; i += 2 )
137 uint16_t v = GetWLE( &psz_out[i] );
138 var_buffer_add16( p_buf, v );
146 void var_buffer_free( var_buffer_t *p_buf )
148 free( p_buf->p_data );
153 void var_buffer_initread( var_buffer_t *p_buf, void *p_data, int i_data )
155 p_buf->i_size = i_data;
157 p_buf->p_data = p_data;
160 uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
163 if( p_buf->i_data >= p_buf->i_size )
167 i_byte = p_buf->p_data[p_buf->i_data];
172 uint16_t var_buffer_get16( var_buffer_t *p_buf )
176 i_b1 = var_buffer_get8( p_buf );
177 i_b2 = var_buffer_get8( p_buf );
179 return( i_b1 + ( i_b2 << 8 ) );
183 uint32_t var_buffer_get32( var_buffer_t *p_buf )
187 i_w1 = var_buffer_get16( p_buf );
188 i_w2 = var_buffer_get16( p_buf );
190 return( i_w1 + ( i_w2 << 16 ) );
193 uint64_t var_buffer_get64( var_buffer_t *p_buf )
195 uint64_t i_dw1, i_dw2;
197 i_dw1 = var_buffer_get32( p_buf );
198 i_dw2 = var_buffer_get32( p_buf );
200 return( i_dw1 + ( i_dw2 << 32 ) );
203 int var_buffer_getmemory ( var_buffer_t *p_buf, void *p_mem, int64_t i_mem )
207 i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
208 if( i_copy > 0 && p_mem != NULL)
210 memcpy( p_mem, p_buf + p_buf->i_data, i_copy );
216 p_buf->i_data += i_copy;
220 int var_buffer_readempty( var_buffer_t *p_buf )
222 return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
225 void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
229 p_guid->v1 = var_buffer_get32( p_buf );
230 p_guid->v2 = var_buffer_get16( p_buf );
231 p_guid->v3 = var_buffer_get16( p_buf );
233 for( i = 0; i < 8; i++ )
235 p_guid->v4[i] = var_buffer_get8( p_buf );