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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
// improved/optimized/whatever 10/30/00 JF
#include <string.h>
#include <memory.h>
#include "id3_tag.h"
#include "id3_misc_support.h"
luint ID3_Frame::Render (uchar *buffer)
{
luint bytesUsed = 0;
ID3_FrameHeader header;
ID3_FrameDef *info;
luint flags;
luint extras = 0;
header.SetVersion (version, revision);
bytesUsed += header.Size();
// here is where we include things like
// grouping IDs and crypto IDs
if (strlen (encryptionID))
{
buffer[bytesUsed] = encryptionID[0];
bytesUsed++, extras++;
}
if (strlen (groupingID))
{
buffer[bytesUsed] = groupingID[0];
bytesUsed++, extras++;
}
/*
if (version < 4)
{
// benski> set any UTF8 strings read from id3v2.4 to UTF-16,
// so we can write with id3v2.3
for (luint i = 0; i < numFields; i++)
{
if (fields[i]->flags & ID3FF_ADJUSTENC)
{
ID3_TextEnc enc= (ID3_TextEnc) Field(ID3FN_TEXTENC).Get();
if (enc == ID3TE_UTF8 || enc == ID3TE_UTF16_BE)
Field(ID3FN_TEXTENC).Set(ID3TE_UNICODE);
}
}
}
*/
// this call is to tell the string fields
// what they should be rendered/parsed as
// (ASCII or Unicode)
UpdateStringTypes();
for (luint i = 0; i < numFields; i++)
{
fields[i]->SetVersion (version, revision);
bytesUsed += fields[i]->Render (&buffer[bytesUsed]);
}
// if we can compress frames individually and we
// have been asked to compress the frames
/*
if (compression && version >= 3)
{
luint newFrameSize;
uchar *newTemp;
bytesUsed -= header.Size();
newFrameSize = bytesUsed + (bytesUsed / 10) + 12;
if (newTemp = new uchar[newFrameSize])
{
if (compress (newTemp, &newFrameSize, &buffer[header.Size() + extras], bytesUsed - extras) == Z_OK)
{
// if the compression actually saves space
if ((newFrameSize + sizeof (luint)) < bytesUsed)
{
luint posn;
int i;
posn = header.Size();
extras += sizeof (luint);
memcpy (&buffer[posn + sizeof (luint)], newTemp, newFrameSize);
for (i = 0; i < sizeof (luint); i++)
buffer[posn + i] = (uchar) ((bytesUsed >> ((sizeof (luint) - i - 1) * 8)) & 0xFF);
bytesUsed = newFrameSize + sizeof (luint);
didCompress = true;
}
}
else
ID3_THROW (ID3E_zlibError);
bytesUsed += header.Size();
delete[] newTemp;
}
else
ID3_THROW (ID3E_NoMemory);
}
*/
// perform any encryption here
/* if (strlen (encryptionID))
{
}*/
// determine which flags need to be set
if (info = ID3_FindFrameDef (frameID))
{
bool didCompress = false;
flags = 0;
if (version == 4)
{
if (info->tagDiscard)
flags |= ID3FL_TAGALTER_2_4;
if (info->fileDiscard)
flags |= ID3FL_FILEALTER_2_4;
if (didCompress)
flags |= ID3FL_COMPRESSION_2_4;
if (strlen (encryptionID))
flags |= ID3FL_ENCRYPTION_2_4;
if (strlen (groupingID))
flags |= ID3FL_GROUPING_2_4;
}
else
{
if (info->tagDiscard)
flags |= ID3FL_TAGALTER_2_3;
if (info->fileDiscard)
flags |= ID3FL_FILEALTER_2_3;
if (didCompress)
flags |= ID3FL_COMPRESSION_2_3;
if (strlen (encryptionID))
flags |= ID3FL_ENCRYPTION_2_3;
if (strlen (groupingID))
flags |= ID3FL_GROUPING_2_3;
}
}
else
ID3_THROW (ID3E_InvalidFrameID);
header.SetFrameID(frameID);
header.SetFlags(flags);
header.SetDataSize(bytesUsed - header.Size());
header.Render(buffer);
hasChanged = false;
return bytesUsed;
}
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