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// The authors have released ID3Lib as Public Domain (PD) and claim no copyright,
// patent or other intellectual property protection in this work. This means that
// it may be modified, redistributed and used in commercial and non-commercial
// software and hardware without restrictions. ID3Lib is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
//
// The ID3Lib authors encourage improvements and optimisations to be sent to the
// ID3Lib coordinator, currently Dirk Mahoney (dirk@id3.org). Approved
// submissions may be altered, and will be included and released under these terms.
//
// Mon Nov 23 18:34:01 1998
#include <string.h>
#include "id3_tag.h"
bool exists ( char *name )
{
bool doesExist = false;
FILE *in;
if ( name )
{
if ( in = fopen ( name, "rb" ) )
{
doesExist = true;
fclose ( in );
}
}
else
ID3_THROW ( ID3E_NoData );
return doesExist;
}
void ID3_Tag::OpenLinkedFile ( void )
{
char *mode = "rb+";
if ( ! exists ( fileName ) )
mode = "wb+";
if ( fileHandle = fopen ( fileName, mode ) )
{
fseek ( fileHandle, 0, SEEK_END );
fileSize = ftell ( fileHandle );
fseek ( fileHandle, 0, SEEK_SET );
}
return;
}
luint ID3_Tag::Link ( char *fileInfo )
{
luint posn = 0;
if ( fileInfo )
{
strncpy ( fileName, fileInfo, 256 );
// if we were attached to some other file
// file then abort
if ( fileHandle )
ID3_THROW ( ID3E_TagAlreadyAttached );
GenerateTempName();
OpenLinkedFile();
oldTagSize = ParseFromHandle();
if ( oldTagSize )
oldTagSize += ID3_TAGHEADERSIZE;
fileSize -= oldTagSize;
posn = oldTagSize;
}
else
ID3_THROW ( ID3E_NoData );
return posn;
}
void ID3_Tag::Update ( void )
{
if ( HasChanged() )
RenderToHandle();
return;
}
void ID3_Tag::Strip ( bool v1Also )
{
FILE *tempOut;
if ( strlen ( tempName ) > 0 )
{
if ( tempOut = fopen ( tempName, "wb" ) )
{
uchar *buffer2;
fseek ( fileHandle, oldTagSize, SEEK_SET );
if ( buffer2 = new uchar[ BUFF_SIZE ] )
{
bool done = false;
luint bytesCopied = 0;
luint bytesToCopy = fileSize;
int i;
if ( hasV1Tag && v1Also )
bytesToCopy -= extraBytes;
while ( ! feof ( fileHandle ) && ! done )
{
luint size = BUFF_SIZE;
if ( ( bytesToCopy - bytesCopied ) < BUFF_SIZE )
{
size = bytesToCopy - bytesCopied;
done = true;
}
if ( i = fread ( buffer2, 1, size, fileHandle ) )
fwrite ( buffer2, 1, i, tempOut );
bytesCopied += i;
}
delete[] buffer2;
}
fclose ( tempOut );
fclose ( fileHandle );
remove ( fileName );
rename ( tempName, fileName );
OpenLinkedFile();
oldTagSize = 0;
extraBytes = 0;
if ( v1Also )
hasV1Tag = false;
hasChanged = true;
}
}
return;
}
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