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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 <memory.h>
#include "id3_tag.h"
#include "id3_misc_support.h"
#include <windows.h>
luint ID3_Tag::Render( uchar *buffer )
{
luint bytesUsed = 0;
ID3_Elem *cur = frameList;
ID3_TagHeader header;
if (version > ID3_TAGVERSION || (version == ID3_TAGVERSION && revision > ID3_TAGREVISION))
SetVersion(version, revision);
else
SetVersion ( ID3_TAGVERSION, ID3_TAGREVISION );
header.SetVersion ( version, revision );
bytesUsed += header.Size();
// set up the encryption and grouping IDs
while (cur)
{
if (cur->frame)
{
cur->frame->compression = compression;
cur->frame->SetVersion ( version, revision );
bytesUsed += cur->frame->Render(&buffer[bytesUsed]);
}
cur = cur->next;
}
if (syncOn)
{
luint newTagSize;
newTagSize = GetUnSyncSize ( &buffer[ header.Size() ], bytesUsed - header.Size() );
if ( newTagSize > 0 && ( newTagSize + header.Size() ) > bytesUsed )
{
uchar *tempz;
if ( tempz = (uchar*)calloc(newTagSize, sizeof(uchar)) )
{
UnSync ( tempz, newTagSize, &buffer[ header.Size() ], bytesUsed - header.Size() );
header.SetFlags ( ID3HF_UNSYNC );
memcpy ( &buffer[ header.Size() ], tempz, newTagSize );
bytesUsed = newTagSize + header.Size();
free(tempz);
}
else
ID3_THROW ( ID3E_NoMemory );
}
}
// zero the remainder of the buffer so that our
// padding bytes are zero
luint paddingSize = PaddingSize(bytesUsed);
for ( luint i = 0; i < paddingSize; i++ )
buffer[ bytesUsed + i ] = 0;
bytesUsed += paddingSize;
header.SetDataSize ( bytesUsed - header.Size() );
header.Render ( buffer );
// set the flag which says that the tag hasn't changed
hasChanged = false;
return bytesUsed;
}
luint ID3_Tag::Size( void )
{
luint bytesUsed = 0;
ID3_Elem *cur = frameList;
ID3_TagHeader header;
header.SetVersion(version, revision);
bytesUsed += header.Size();
while (cur)
{
if (cur->frame)
{
cur->frame->SetVersion ( version, revision );
bytesUsed += cur->frame->Size();
}
cur = cur->next;
}
// add 30% for sync
if (syncOn)
bytesUsed += bytesUsed / 3;
bytesUsed += PaddingSize(bytesUsed);
return bytesUsed;
}
void ID3_Tag::RenderExtHeader ( uchar *buffer )
{
if ( version == 3 && revision == 0 )
{
}
return;
}
#define ID3_PADMULTIPLE ( 2048 )
#define ID3_PADMAX ( 4096 )
luint ID3_Tag::PaddingSize(luint curSize)
{
luint newSize = 0;
// if padding is switched off
if (!padding)
return 0;
if (forcedPadding)
return forcedPadding;
else
newSize = ( ( curSize / ID3_PADMULTIPLE ) + 1 ) * ID3_PADMULTIPLE;
return newSize - curSize;
}
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