/// <summary>
/// Reads the contents of the current instance determining
/// the size of the dsf data, the area the tagging is in,
/// and optionally reading in the tags and media properties.
/// </summary>
/// <param name="read_tags">
/// If <see langword="true" />, any tags found will be read
/// into the current instance.
/// </param>
/// <param name="style">
/// A <see cref="ReadStyle"/> value specifying how the media
/// data is to be read into the current instance.
/// </param>
/// <param name="dsf_size">
/// A <see cref="uint"/> value reference to be filled with
/// the size of the RIFF data as read from the file.
/// </param>
/// <param name="tag_start">
/// A <see cref="long" /> value reference to be filled with
/// the absolute seek position at which the tagging data
/// starts.
/// </param>
/// <param name="tag_end">
/// A <see cref="long" /> value reference to be filled with
/// the absolute seek position at which the tagging data
/// ends.
/// </param>
/// <exception cref="CorruptFileException">
/// The file does not begin with <see cref="FileIdentifier"
/// />.
/// </exception>
private void Read(bool read_tags, ReadStyle style,
out uint dsf_size, out long tag_start,
out long tag_end)
{
Seek(0);
if (ReadBlock(4) != FileIdentifier)
{
throw new CorruptFileException(
"File does not begin with DSF identifier");
}
Seek(12);
dsf_size = ReadBlock(8).ToUInt(false);
tag_start = (long)ReadBlock(8).ToULong(false);
tag_end = -1;
// Get the properties of the file
if (header_block == null &&
style != ReadStyle.None)
{
long fmt_chunk_pos = Find(FormatIdentifier, 0);
if (fmt_chunk_pos == -1)
{
throw new CorruptFileException(
"No Format chunk available in DSF file.");
}
Seek(fmt_chunk_pos);
header_block = ReadBlock((int)StreamHeader.Size);
StreamHeader header = new StreamHeader(header_block, dsf_size);
properties = new Properties(TimeSpan.Zero, header);
}
// Now position to the ID3 chunk, which we read before
if (tag_start > 0)
{
Seek(tag_start);
if (ReadBlock(3) == ID3Identifier)
{
if (read_tags && tag == null)
{
tag = new Id3v2.Tag(this, tag_start, style);
}
// Get the length of the tag out of the ID3 chunk
Seek(tag_start + 6);
uint tag_size = SynchData.ToUInt(ReadBlock(4)) + 10;
InvariantStartPosition = tag_start;
tag_end = InvariantEndPosition = tag_start + tag_size;
}
}
}
/// <summary>
/// Reads the contents of the current instance determining
/// the size of the dsf data, the area the tagging is in,
/// and optionally reading in the tags and media properties.
/// </summary>
/// <param name="read_tags">
/// If <see langword="true" />, any tags found will be read
/// into the current instance.
/// </param>
/// <param name="style">
/// A <see cref="ReadStyle"/> value specifying how the media
/// data is to be read into the current instance.
/// </param>
/// <param name="dsf_size">
/// A <see cref="uint"/> value reference to be filled with
/// the size of the RIFF data as read from the file.
/// </param>
/// <param name="tag_start">
/// A <see cref="long" /> value reference to be filled with
/// the absolute seek position at which the tagging data
/// starts.
/// </param>
/// <param name="tag_end">
/// A <see cref="long" /> value reference to be filled with
/// the absolute seek position at which the tagging data
/// ends.
/// </param>
/// <exception cref="CorruptFileException">
/// The file does not begin with <see cref="FileIdentifier"
/// />.
/// </exception>
private void Read(bool read_tags, ReadStyle style,
out uint dsf_size, out long tag_start,
out long tag_end)
{
Seek(0);
if (ReadBlock(4) != FileIdentifier)
throw new CorruptFileException(
"File does not begin with DSF identifier");
Seek(12);
dsf_size = ReadBlock(8).ToUInt(false);
tag_start = (long)ReadBlock(8).ToULong(false);
tag_end = -1;
// Get the properties of the file
if (header_block == null &&
style != ReadStyle.None)
{
long fmt_chunk_pos = Find(FormatIdentifier, 0);
if (fmt_chunk_pos == -1)
{
throw new CorruptFileException(
"No Format chunk available in DSF file.");
}
Seek(fmt_chunk_pos);
header_block = ReadBlock((int) StreamHeader.Size);
StreamHeader header = new StreamHeader(header_block, dsf_size);
properties = new Properties(TimeSpan.Zero, header);
}
// Now position to the ID3 chunk, which we read before
if (tag_start > 0)
{
Seek(tag_start);
if (ReadBlock(3) == ID3Identifier)
{
if (read_tags && tag == null)
{
tag = new Id3v2.Tag(this, tag_start);
}
// Get the length of the tag out of the ID3 chunk
Seek(tag_start + 6);
uint tag_size = SynchData.ToUInt(ReadBlock(4)) + 10;
InvariantStartPosition = tag_start;
tag_end = InvariantEndPosition = tag_start + tag_size;
}
}
}
