1 /*****************************************************************************
2 * buffer.c: MMS access plug-in
3 *****************************************************************************
4 * Copyright (C) 2001-2004 VLC authors and VideoLAN
5 * $Id: 1aab6aa8bf35e0ca98c8f4b6d1c93804d11695e5 $
6 *
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
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 Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
23
24 /*****************************************************************************
25 * Preamble
26 *****************************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 # include "config.h"
30 #endif
31
32 #include <vlc_common.h>
33 #include <vlc_access.h>
34 #include <vlc_charset.h>
35
36 #include "asf.h"
37 #include "buffer.h"
38
39 /*****************************************************************************
40 * Buffer management functions
41 *****************************************************************************/
var_buffer_initwrite(var_buffer_t * p_buf,int i_default_size)42 int var_buffer_initwrite( var_buffer_t *p_buf, int i_default_size )
43 {
44 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
45 p_buf->i_data = 0;
46 p_buf->p_data = malloc( p_buf->i_size );
47 return p_buf->p_data ? 0 : -1;
48 }
49
var_buffer_reinitwrite(var_buffer_t * p_buf,int i_default_size)50 int var_buffer_reinitwrite( var_buffer_t *p_buf, int i_default_size )
51 {
52 p_buf->i_data = 0;
53 if( p_buf->i_size < i_default_size )
54 {
55 p_buf->i_size = i_default_size;
56 free( p_buf->p_data );
57 p_buf->p_data = malloc( p_buf->i_size );
58 }
59 if( !p_buf->p_data )
60 {
61 p_buf->i_size = ( i_default_size > 0 ) ? i_default_size : 2048;
62 p_buf->p_data = malloc( p_buf->i_size );
63 }
64 return p_buf->p_data ? 0 : -1;
65 }
66
var_buffer_add8(var_buffer_t * p_buf,uint8_t i_byte)67 void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t i_byte )
68 {
69 /* check if there is enough data */
70 if( p_buf->i_data >= p_buf->i_size )
71 {
72 p_buf->i_size += 1024;
73 p_buf->p_data = xrealloc( p_buf->p_data, p_buf->i_size );
74 }
75 p_buf->p_data[p_buf->i_data] = i_byte&0xff;
76 p_buf->i_data++;
77 }
78
var_buffer_add16(var_buffer_t * p_buf,uint16_t i_word)79 void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
80 {
81 var_buffer_add8( p_buf, i_word&0xff );
82 var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
83 }
84
var_buffer_add32(var_buffer_t * p_buf,uint32_t i_dword)85 void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
86 {
87 var_buffer_add16( p_buf, i_dword&0xffff );
88 var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
89 }
90
var_buffer_add64(var_buffer_t * p_buf,uint64_t i_long)91 void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
92 {
93 var_buffer_add32( p_buf, i_long&0xffffffff );
94 var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
95 }
96
var_buffer_addmemory(var_buffer_t * p_buf,void * p_mem,int i_mem)97 void var_buffer_addmemory( var_buffer_t *p_buf, void *p_mem, int i_mem )
98 {
99 /* check if there is enough data */
100 if( p_buf->i_data + i_mem >= p_buf->i_size )
101 {
102 p_buf->i_size += i_mem + 1024;
103 p_buf->p_data = xrealloc( p_buf->p_data, p_buf->i_size );
104 }
105
106 memcpy( p_buf->p_data + p_buf->i_data, p_mem, i_mem );
107 p_buf->i_data += i_mem;
108 }
109
var_buffer_addUTF16(stream_t * p_access,var_buffer_t * p_buf,const char * p_str)110 void var_buffer_addUTF16( stream_t *p_access, var_buffer_t *p_buf, const char *p_str )
111 {
112 uint16_t *p_out;
113 size_t i_out;
114
115 if( p_str != NULL )
116 #ifdef WORDS_BIGENDIAN
117 p_out = ToCharset( "UTF-16BE", p_str, &i_out );
118 #else
119 p_out = ToCharset( "UTF-16LE", p_str, &i_out );
120 #endif
121 else
122 p_out = NULL;
123 if( p_out == NULL )
124 {
125 msg_Err( p_access, "UTF-16 conversion failed" );
126 i_out = 0;
127 }
128
129 i_out /= 2;
130 for( size_t i = 0; i < i_out; i ++ )
131 var_buffer_add16( p_buf, p_out[i] );
132 free( p_out );
133
134 var_buffer_add16( p_buf, 0 );
135 }
136
var_buffer_free(var_buffer_t * p_buf)137 void var_buffer_free( var_buffer_t *p_buf )
138 {
139 free( p_buf->p_data );
140 p_buf->i_data = 0;
141 p_buf->i_size = 0;
142 }
143
var_buffer_initread(var_buffer_t * p_buf,void * p_data,int i_data)144 void var_buffer_initread( var_buffer_t *p_buf, void *p_data, int i_data )
145 {
146 p_buf->i_size = i_data;
147 p_buf->i_data = 0;
148 p_buf->p_data = p_data;
149 }
150
var_buffer_get8(var_buffer_t * p_buf)151 uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
152 {
153 uint8_t i_byte;
154 if( p_buf->i_data >= p_buf->i_size )
155 {
156 return( 0 );
157 }
158 i_byte = p_buf->p_data[p_buf->i_data];
159 p_buf->i_data++;
160 return( i_byte );
161 }
162
var_buffer_get16(var_buffer_t * p_buf)163 uint16_t var_buffer_get16( var_buffer_t *p_buf )
164 {
165 uint16_t i_b1, i_b2;
166
167 i_b1 = var_buffer_get8( p_buf );
168 i_b2 = var_buffer_get8( p_buf );
169
170 return( i_b1 + ( i_b2 << 8 ) );
171
172 }
173
var_buffer_get32(var_buffer_t * p_buf)174 uint32_t var_buffer_get32( var_buffer_t *p_buf )
175 {
176 uint32_t i_w1, i_w2;
177
178 i_w1 = var_buffer_get16( p_buf );
179 i_w2 = var_buffer_get16( p_buf );
180
181 return( i_w1 + ( i_w2 << 16 ) );
182 }
183
var_buffer_get64(var_buffer_t * p_buf)184 uint64_t var_buffer_get64( var_buffer_t *p_buf )
185 {
186 uint64_t i_dw1, i_dw2;
187
188 i_dw1 = var_buffer_get32( p_buf );
189 i_dw2 = var_buffer_get32( p_buf );
190
191 return( i_dw1 + ( i_dw2 << 32 ) );
192 }
193
var_buffer_getmemory(var_buffer_t * p_buf,void * p_mem,int64_t i_mem)194 int var_buffer_getmemory ( var_buffer_t *p_buf, void *p_mem, int64_t i_mem )
195 {
196 int i_copy;
197
198 i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
199 if( i_copy > 0 && p_mem != NULL)
200 {
201 memcpy( p_mem, p_buf->p_data + p_buf->i_data , i_copy );
202 }
203 if( i_copy < 0 )
204 {
205 i_copy = 0;
206 }
207 p_buf->i_data += i_copy;
208 return( i_copy );
209 }
210
var_buffer_readempty(var_buffer_t * p_buf)211 int var_buffer_readempty( var_buffer_t *p_buf )
212 {
213 return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
214 }
215
var_buffer_getguid(var_buffer_t * p_buf,guid_t * p_guid)216 void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
217 {
218 p_guid->Data1 = var_buffer_get32( p_buf );
219 p_guid->Data2 = var_buffer_get16( p_buf );
220 p_guid->Data3 = var_buffer_get16( p_buf );
221
222 for( int i = 0; i < 8; i++ )
223 p_guid->Data4[i] = var_buffer_get8( p_buf );
224 }
225