public static long OffsetToMpegHeader(FileInfo file)
{
long tagSize = TagUtils.TagSizeV2(file);
using (Stream s = VirtualDrive.OpenInStream(file.FullName))
{
s.Seek(tagSize, SeekOrigin.Begin);
return(tagSize + TagUtils.OffsetToFirstMpegHeader(s));
}
}
private static void TestTagUtilsWriteRawSmallerQuantizeAbove()
{
string fileName = VirtualDrive.VirtualFileName("TestTagUtilsWriteRawSmallerQuantizeAbove\\t1.mp3");
TestTags.WriteDemoMp3(fileName, TestTags.demoTag2_4);
FileInfo fileInfo = new FileInfo(fileName);
TagUtils.WriteTagV2(TestTags.demoTag2_3, fileInfo, Rewriter.Strategy.Quantize);
UnitTest.Test(TagUtils.TagSizeV2(new FileInfo(fileName)) % Rewriter.BlockSize == 0);
TagUtils.StripTagV2(new FileInfo(fileName), 0);
UnitTest.Test(ArrayUtils.IsEqual(VirtualDrive.Load(fileName), TestTags.mpegDummy));
}
private static void TestTagUtilsWriteRawSmallerNeverShrink()
{
string fileName = VirtualDrive.VirtualFileName("TestTagUtilsWriteRawSmallerNeverShrink\\t1.mp3");
TestTags.WriteDemoMp3(fileName, TestTags.demoTag2_4);
FileInfo fileInfo = new FileInfo(fileName);
TagUtils.WriteTagV2(TestTags.demoTag2_3, fileInfo, Rewriter.Strategy.NeverShrink);
UnitTest.Test(TagUtils.TagSizeV2(fileInfo) == TestTags.demoTag2_4.Length);
TagUtils.StripTagV2(fileInfo, 0);
UnitTest.Test(ArrayUtils.IsEqual(VirtualDrive.Load(fileName), TestTags.mpegDummy));
}
public int Rewrite(int bytesRequired, FileInfo file)
{
int padding = CalculatePadding(bytesRequired, file);
if (padding < bytesRequired)
{
throw new Exception("CalculatePadding failed! Padding too small!");
}
if (TagUtils.TagSizeV2(file) != padding)
{
TagUtils.StripTagV2(file, padding);
}
return(padding);
}
public static long OffsetTagToMpegHeader(FileInfo file)
{
long tagSize = TagUtils.TagSizeV2(file);
using (Stream s = VirtualDrive.OpenInStream(file.FullName))
{
s.Seek(tagSize, SeekOrigin.Begin);
long offset = TagUtils.OffsetToFirstMpegHeader(s);
if (offset > 0)
{
Logger.WriteLine(Tokens.Warning, "Tag V2 has wrong size. Offset to MPEG header: " + offset
+ " in file " + file.FullName);
}
return(offset);
}
}
private int CalculatePadding(int bytesRequired, FileInfo file)
{
int padding = 0;
switch (CurrentStrategy)
{
case Strategy.Exact:
padding = bytesRequired;
break;
case Strategy.NeverShrink:
padding = Math.Max(bytesRequired, TagUtils.TagSizeV2(file));
break;
case Strategy.Quantize:
padding = CeilBlockSize(bytesRequired);
break;
default:
throw new Exception("Unknown write strategy");
}
return(padding);
}
