SjByteVector ID3v2_Frame::fieldData(const SjByteVector &frameData) const
{
SjUint headerSize = ID3v2_FrameHeader::size(m_header->version());
SjUint frameDataOffset = headerSize;
SjUint frameDataLength = size();
if(m_header->compression() || m_header->dataLengthIndicator()) {
frameDataLength = frameData.mid(headerSize, 4).toUInt();
frameDataOffset += 4;
}
if(m_header->compression()) {
SjByteVector data(frameDataLength);
uLongf uLongTmp = data.size(); // normally, this should be same as frameDataLength - however, on allocation errors, this may be 0!
::uncompress((Bytef *) data.getWriteableData(),
(uLongf *) &uLongTmp,
(Bytef *) frameData.getReadableData() + frameDataOffset,
size());
return data;
}
else
return frameData.mid(frameDataOffset, frameDataLength);
}
void ID3v2_PopularimeterFrame::parseFields(const SjByteVector& data)
{
m_email.Empty();
m_rating255 = 0;
m_counter = 0;
int offset, pos = 0, size = (int)data.size();
offset = data.find(textDelimiter(SJ_LATIN1), pos);
if( offset < pos ) {
return;
}
m_email = data.mid(pos, offset - pos).toString(SJ_LATIN1);
pos = offset + 1;
if(pos < size)
{
m_rating255 = (int)(data[pos]);
pos++;
if(pos < size)
{
m_counter = data.mid(pos, 4).toUInt();
}
}
}
void MPEG_XingHeader::parse(const SjByteVector &data)
{
// Check to see if a valid Xing header is available.
if(!data.startsWith((unsigned char*)"Xing"))
{
return;
}
// If the XingHeader doesn't contain the number of frames and the total stream
// info it's invalid.
if(!(data[7] & 0x02))
{
wxLogDebug(wxT("MPEG::XingHeader::parse() -- Xing header doesn't contain the total number of frames."));
return;
}
if(!(data[7] & 0x04))
{
wxLogDebug(wxT("MPEG::XingHeader::parse() -- Xing header doesn't contain the total stream size."));
return;
}
m_frames = data.mid(8, 4).toUInt();
m_size = data.mid(12, 4).toUInt();
m_valid = true;
}
void ID3v2_TextIdentificationFrame::parseFields(const SjByteVector &data)
{
// read the string data type (the first byte of the field data)
m_textEncoding = (SjStringType)(data[0]);
// split the byte array into chunks based on the string type (two byte delimiter
// for unicode encodings)
int byteAlign = m_textEncoding == SJ_LATIN1 || m_textEncoding == SJ_UTF8 ? 1 : 2;
//ByteVectorList l = ByteVectorList::split(data.mid(1), textDelimiter(d->textEncoding), byteAlign);
SjArrayByteVector l = data.mid(1).splitToArray(textDelimiter(m_textEncoding), byteAlign);
m_fieldList.Empty();
// append those split values to the list and make sure that the new string's
// type is the same specified for this frame
/*for(ByteVectorList::Iterator it = l.begin(); it != l.end(); it++) {
String s(*it, d->textEncoding);
d->fieldList.append(s);
}
*/
int i, iCount = l.GetCount();
for( i = 0; i < iCount; i++ )
{
m_fieldList.Add(l.Item(i).toString(m_textEncoding));
}
}
void ID3v2_AttachedPictureFrame::parseFields(const SjByteVector &data)
{
if(data.size() < 5) {
wxLogDebug(wxT("A picture frame must contain at least 5 bytes."));
return;
}
int pos = 0, offset;
// read text encoding
m_textEncoding = (SjStringType)(data[pos]);
pos += 1;
if( header()->version() <= 2 )
{
// read image format (3 characters), valid for ID3V2_2_1 or older
m_mimeType = data.mid(pos, 3).toString(SJ_LATIN1);
pos += 3;
}
else
{
// read mime type (null-terminated), valid for newer specs
offset = data.find(textDelimiter(SJ_LATIN1), pos);
if(offset < pos)
return;
m_mimeType = data.mid(pos, offset - pos).toString(SJ_LATIN1);
pos = offset + 1;
}
// read type
m_type = (ID3v2_AttachedPictureType)(data[pos]);
pos += 1;
// read description
offset = data.find(textDelimiter(m_textEncoding), pos);
if(offset < pos)
return;
m_description = data.mid(pos, offset - pos).toString(m_textEncoding);
pos = offset + 1;
// read image data
m_data = data.mid(pos);
}
void APE_Item::parse(const SjByteVector &data)
{
// 11 bytes is the minimum size for an APE item
if(data.size() < 11)
{
wxLogDebug(wxT("APE::Item::parse() -- no data in item"));
return;
}
SjUint valueLength = data.mid(0, 4).toUInt(false);
SjUint flags = data.mid(4, 4).toUInt(false);
m_key = data.mid(8).toString(SJ_UTF8); // data.mid(8) contains more than just the string -- but SjBytevector only converts up to the first null-byte at (***)
m_binary = data.mid(8 + m_key.size() + 1, valueLength);
setReadOnly(flags & 1);
setType((APE_ItemType)((flags >> 1) & 3));
if(int(m_type) < 2)
{
m_stringList = m_binary.splitToStrings((unsigned char)'\0', SJ_UTF8);
}
}
void ID3v2_CommentsFrame::parseFields(const SjByteVector &data)
{
if(data.size() < 5) {
wxLogDebug(wxT("A comment frame must contain at least 5 bytes."));
return;
}
m_textEncoding = (SjStringType)(data[0]);
m_language = data.mid(1, 3);
int byteAlign = (m_textEncoding == SJ_LATIN1 || m_textEncoding == SJ_UTF8) ? 1 : 2;
//ByteVectorList l = ByteVectorList::split(data.mid(4), textDelimiter(d->textEncoding), byteAlign, 2);
SjArrayByteVector l = data.mid(4).splitToArray(textDelimiter(m_textEncoding), byteAlign, 2);
if(l.GetCount() == 2) {
/*d->description = String(l.front(), d->textEncoding);
d->text = String(l.back(), d->textEncoding);
*/
m_description = l.Item(0).toString(m_textEncoding);
m_text = l.Item(1).toString(m_textEncoding);
}
}
void APE_Tag::parse(const SjByteVector &data)
{
SjUint pos = 0;
// 11 bytes is the minimum size for an APE item
for(SjUint i = 0; i < m_footer.itemCount() && pos <= data.size() - 11; i++)
{
APE_Item item;
item.parse(data.mid(pos));
setItem(item.key().Upper(), item);
pos += item.size();
}
}
void APE_Footer::parse(const SjByteVector &data)
{
if( data.size() < APE_FOOTER_SIZE )
{
return;
}
// The first eight bytes, data[0..7], are the File Identifier, "APETAGEX".
// Read the version number
m_version = data.mid(8, 4).toUInt(false);
// Read the tag size
m_tagSize = data.mid(12, 4).toUInt(false);
// Read the item count
m_itemCount = data.mid(16, 4).toUInt(false);
// Read the flags
unsigned long flags = (unsigned long)data.mid(20, 4).toUInt(false);
m_headerPresent = (flags & (1<<31))!=0;
m_footerPresent = !((flags & (1<<30))!=0);
m_isHeader = (flags & (1<<29))!=0;
}
void ID3v2_Tag::parse(const SjByteVector &data)
{
SjUint frameDataPosition = 0;
SjUint frameDataLength = data.size();
// check for extended header
if(m_header.extendedHeader()) {
if(!m_extendedHeader)
m_extendedHeader = new ID3v2_ExtendedHeader;
m_extendedHeader->setData(data);
if(m_extendedHeader->size() <= data.size()) {
frameDataPosition += m_extendedHeader->size();
frameDataLength -= m_extendedHeader->size();
}
}
// check for footer -- we don't actually need to parse it, as it *must*
// contain the same data as the header, but we do need to account for its
// size.
if(m_header.footerPresent() && ID3v2_Footer::size() <= frameDataLength)
frameDataLength -= ID3v2_Footer::size();
// parse frames
// Make sure that there is at least enough room in the remaining frame data for
// a frame header.
while(frameDataPosition < frameDataLength - ID3v2_Frame::headerSize(m_header.majorVersion())) {
// If the next data is position is 0, assume that we've hit the padding
// portion of the frame data.
if(data.at(frameDataPosition) == 0) {
if(m_header.footerPresent())
wxLogDebug(wxT("Padding *and* a footer found. This is not allowed by the spec."));
m_paddingSize = frameDataLength - frameDataPosition;
return;
}
ID3v2_Frame *frame = m_factory->createFrame(data.mid(frameDataPosition),
m_header.majorVersion());
if(!frame)
return;
// get the next frame position
frameDataPosition += frame->size() + ID3v2_Frame::headerSize(m_header.majorVersion());
// add the frame if it has a size of at least 1 byte (smaller frames are not allowed
// by the specification, but they're returned from createFrame() to allow seeking to the
// next frame).
// modification by me
if(frame->size() <= 0) {
delete frame;
}
else {
addFrame(frame);
}
}
}
void ID3v2_FrameHeader::setFrameID(const SjByteVector &id)
{
m_frameID = id.mid(0, 4);
}
void ID3v2_FrameHeader::setData(const SjByteVector &data, SjUint version)
{
// this was ID3v2_FrameHeaderPrivate
m_isOkay = FALSE;
m_frameSize = 0;
m_version = 4;
m_tagAlterPreservation = false;
m_fileAlterPreservation = false;
m_readOnly = false;
m_groupingIdentity = false;
m_compression = false;
m_encryption = false;
m_unsyncronisation = false;
m_dataLengthIndicator = false;
// /ID3v2_FrameHeaderPrivate
m_version = version;
switch(version) {
case 0:
case 1:
case 2:
{
// ID3v2.2
if(data.size() < 3) {
wxLogDebug(wxT("You must at least specify a frame ID."));
return;
}
// Set the frame ID -- the first three bytes
m_frameID = data.mid(0, 3);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if(data.size() < 6) {
return;
}
m_frameSize = data.mid(3, 3).toUInt();
break;
}
case 3:
{
// ID3v2.3 - see http://www.id3.org/id3v2.3.0.html#sec3.3
if(data.size() < 4) {
wxLogDebug(wxT("You must at least specify a frame ID."));
return;
}
// Set the frame ID -- the first four bytes
m_frameID = data.mid(0, 4);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if(data.size() < 10) {
return;
}
// Set the size -- the frame size is the four bytes starting at byte four in
// the frame header (structure 4)
m_frameSize = data.mid(4, 4).toUInt();
{ // read the first byte of flags
/*std::bitset<8> flags(data[8]);
d->tagAlterPreservation = flags[7]; // (structure 3.3.1.a)
d->fileAlterPreservation = flags[6]; // (structure 3.3.1.b)
d->readOnly = flags[5]; // (structure 3.3.1.c)*/
unsigned char flags = data[8];
m_tagAlterPreservation = (flags & (1<<7)) != 0;
m_fileAlterPreservation = (flags & (1<<6)) != 0;
m_readOnly = (flags & (1<<5)) != 0;
}
{ // read the second byte of flags
/*std::bitset<8> flags(data[9]);
d->compression = flags[7]; // (structure 3.3.1.i)
d->encryption = flags[6]; // (structure 3.3.1.j)
d->groupingIdentity = flags[5]; // (structure 3.3.1.k)*/
unsigned char flags = data[9];
m_compression = (flags & (1<<7)) != 0;
m_encryption = (flags & (1<<6)) != 0;
m_groupingIdentity = (flags & (1<<5)) != 0;
}
break;
}
case 4:
default:
{
// ID3v2.4
if(data.size() < 4) {
wxLogDebug(wxT("You must at least specify a frame ID."));
return;
}
// Set the frame ID -- the first four bytes
m_frameID = data.mid(0, 4);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if(data.size() < 10) {
return;
}
// Set the size -- the frame size is the four bytes starting at byte four in
// the frame header (structure 4)
m_frameSize = ID3v2_SynchDataToUInt(data.mid(4, 4));
{ // read the first byte of flags
/*std::bitset<8> flags(data[8]);
d->tagAlterPreservation = flags[6]; // (structure 4.1.1.a)
d->fileAlterPreservation = flags[5]; // (structure 4.1.1.b)
d->readOnly = flags[4]; // (structure 4.1.1.c)*/
unsigned char flags = data[8];
m_tagAlterPreservation = (flags & (1<<6)) != 0;
m_fileAlterPreservation = (flags & (1<<5)) != 0;
m_readOnly = (flags & (1<<4)) != 0;
}
{ // read the second byte of flags
/*std::bitset<8> flags(data[9]);
d->groupingIdentity = flags[6]; // (structure 4.1.2.h)
d->compression = flags[3]; // (structure 4.1.2.k)
d->encryption = flags[2]; // (structure 4.1.2.m)
d->unsyncronisation = flags[1]; // (structure 4.1.2.n)
d->dataLengthIndicator = flags[0]; // (structure 4.1.2.p)*/
unsigned char flags = data[9];
m_groupingIdentity = (flags & (1<<6)) != 0;
m_compression = (flags & (1<<3)) != 0;
m_encryption = (flags & (1<<2)) != 0;
m_unsyncronisation = (flags & (1<<1)) != 0;
m_dataLengthIndicator = (flags & (1<<0)) != 0;
}
break;
}
}
m_isOkay = TRUE;
}
void ID3v2_CommentsFrame::setLanguage(const SjByteVector &languageEncoding)
{
m_language = languageEncoding.mid(0, 3);
}
