modules/access/mms/buffer.c

   1 /*****************************************************************************
   2  * buffer.c: MMS access plug-in
   3  *****************************************************************************
   4  * Copyright (C) 2001-2004 VLC authors and VideoLAN
   5  *
   6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_access.h>
  33 #include <vlc_charset.h>
  34
  35 #include "asf.h"
  36 #include "buffer.h"
  37
  38 /*****************************************************************************
  39  * Buffer management functions
  40  *****************************************************************************/
  41 int var_buffer_initwrite( var_buffer_t *p_buf, int i_default_size )
  42 {
  43     p_buf->i_size =  ( i_default_size > 0 ) ? i_default_size : 2048;
  44     p_buf->i_data = 0;
  45     p_buf->p_data = malloc( p_buf->i_size );
  46     return p_buf->p_data ? 0 : -1;
  47 }
  48
  49 int var_buffer_reinitwrite( var_buffer_t *p_buf, int i_default_size )
  50 {
  51     p_buf->i_data = 0;
  52     if( p_buf->i_size < i_default_size )
  53     {
  54         p_buf->i_size = i_default_size;
  55         free( p_buf->p_data );
  56         p_buf->p_data = malloc( p_buf->i_size );
  57     }
  58     if( !p_buf->p_data )
  59     {
  60         p_buf->i_size =  ( i_default_size > 0 ) ? i_default_size : 2048;
  61         p_buf->p_data = malloc( p_buf->i_size );
  62     }
  63     return p_buf->p_data ? 0 : -1;
  64 }
  65
  66 void var_buffer_add8 ( var_buffer_t *p_buf, uint8_t  i_byte )
  67 {
  68     /* check if there is enough data */
  69     if( p_buf->i_data >= p_buf->i_size )
  70     {
  71         p_buf->i_size += 1024;
  72         p_buf->p_data = xrealloc( p_buf->p_data, p_buf->i_size );
  73     }
  74     p_buf->p_data[p_buf->i_data] = i_byte&0xff;
  75     p_buf->i_data++;
  76 }
  77
  78 void var_buffer_add16( var_buffer_t *p_buf, uint16_t i_word )
  79 {
  80     var_buffer_add8( p_buf, i_word&0xff );
  81     var_buffer_add8( p_buf, ( i_word >> 8 )&0xff );
  82 }
  83
  84 void var_buffer_add32( var_buffer_t *p_buf, uint32_t i_dword )
  85 {
  86     var_buffer_add16( p_buf, i_dword&0xffff );
  87     var_buffer_add16( p_buf, ( i_dword >> 16 )&0xffff );
  88 }
  89
  90 void var_buffer_add64( var_buffer_t *p_buf, uint64_t i_long )
  91 {
  92     var_buffer_add32( p_buf, i_long&0xffffffff );
  93     var_buffer_add32( p_buf, ( i_long >> 32 )&0xffffffff );
  94 }
  95
  96 void var_buffer_addmemory( var_buffer_t *p_buf, void *p_mem, int i_mem )
  97 {
  98     /* check if there is enough data */
  99     if( p_buf->i_data + i_mem >= p_buf->i_size )
 100     {
 101         p_buf->i_size += i_mem + 1024;
 102         p_buf->p_data = xrealloc( p_buf->p_data, p_buf->i_size );
 103     }
 104
 105     memcpy( p_buf->p_data + p_buf->i_data, p_mem, i_mem );
 106     p_buf->i_data += i_mem;
 107 }
 108
 109 void var_buffer_addUTF16( stream_t  *p_access, var_buffer_t *p_buf, const char *p_str )
 110 {
 111     uint16_t *p_out;
 112     size_t i_out;
 113
 114     if( p_str != NULL )
 115 #ifdef WORDS_BIGENDIAN
 116         p_out = ToCharset( "UTF-16BE", p_str, &i_out );
 117 #else
 118         p_out = ToCharset( "UTF-16LE", p_str, &i_out );
 119 #endif
 120     else
 121         p_out = NULL;
 122     if( p_out == NULL )
 123     {
 124         msg_Err( p_access, "UTF-16 conversion failed" );
 125         i_out = 0;
 126     }
 127
 128     i_out /= 2;
 129     for( size_t i = 0; i < i_out; i ++ )
 130         var_buffer_add16( p_buf, p_out[i] );
 131     free( p_out );
 132
 133     var_buffer_add16( p_buf, 0 );
 134 }
 135
 136 void var_buffer_free( var_buffer_t *p_buf )
 137 {
 138     free( p_buf->p_data );
 139     p_buf->i_data = 0;
 140     p_buf->i_size = 0;
 141 }
 142
 143 void var_buffer_initread( var_buffer_t *p_buf, void *p_data, int i_data )
 144 {
 145     p_buf->i_size = i_data;
 146     p_buf->i_data = 0;
 147     p_buf->p_data = p_data;
 148 }
 149
 150 uint8_t var_buffer_get8 ( var_buffer_t *p_buf )
 151 {
 152     uint8_t  i_byte;
 153     if( p_buf->i_data >= p_buf->i_size )
 154     {
 155         return( 0 );
 156     }
 157     i_byte = p_buf->p_data[p_buf->i_data];
 158     p_buf->i_data++;
 159     return( i_byte );
 160 }
 161
 162 uint16_t var_buffer_get16( var_buffer_t *p_buf )
 163 {
 164     uint16_t i_b1, i_b2;
 165
 166     i_b1 = var_buffer_get8( p_buf );
 167     i_b2 = var_buffer_get8( p_buf );
 168
 169     return( i_b1 + ( i_b2 << 8 ) );
 170
 171 }
 172
 173 uint32_t var_buffer_get32( var_buffer_t *p_buf )
 174 {
 175     uint32_t i_w1, i_w2;
 176
 177     i_w1 = var_buffer_get16( p_buf );
 178     i_w2 = var_buffer_get16( p_buf );
 179
 180     return( i_w1 + ( i_w2 << 16 ) );
 181 }
 182
 183 uint64_t var_buffer_get64( var_buffer_t *p_buf )
 184 {
 185     uint64_t i_dw1, i_dw2;
 186
 187     i_dw1 = var_buffer_get32( p_buf );
 188     i_dw2 = var_buffer_get32( p_buf );
 189
 190     return( i_dw1 + ( i_dw2 << 32 ) );
 191 }
 192
 193 int var_buffer_getmemory ( var_buffer_t *p_buf, void *p_mem, int64_t i_mem )
 194 {
 195     int i_copy;
 196
 197     i_copy = __MIN( i_mem, p_buf->i_size - p_buf->i_data );
 198     if( i_copy > 0 && p_mem != NULL)
 199     {
 200         memcpy( p_mem, p_buf->p_data + p_buf->i_data , i_copy );
 201     }
 202     if( i_copy < 0 )
 203     {
 204         i_copy = 0;
 205     }
 206     p_buf->i_data += i_copy;
 207     return( i_copy );
 208 }
 209
 210 int var_buffer_readempty( var_buffer_t *p_buf )
 211 {
 212     return( ( p_buf->i_data >= p_buf->i_size ) ? 1 : 0 );
 213 }
 214
 215 void var_buffer_getguid( var_buffer_t *p_buf, vlc_guid_t *p_guid )
 216 {
 217     p_guid->Data1 = var_buffer_get32( p_buf );
 218     p_guid->Data2 = var_buffer_get16( p_buf );
 219     p_guid->Data3 = var_buffer_get16( p_buf );
 220
 221     for( int i = 0; i < 8; i++ )
 222         p_guid->Data4[i] = var_buffer_get8( p_buf );
 223 }