private static ICollection <MetadataEntry> ConvertIFDEntriesToMetadataEntries(EndianBinaryReader reader, List <ParserIFDEntry> entries)
{
List <MetadataEntry> metadataEntries = new List <MetadataEntry>(entries.Count);
bool swapNumberByteOrder = reader.Endianess == Endianess.Big;
for (int i = 0; i < entries.Count; i++)
{
ParserIFDEntry entry = entries[i];
byte[] propertyData;
if (entry.OffsetFieldContainsValue)
{
propertyData = entry.GetValueBytesFromOffset();
if (propertyData is null)
{
continue;
}
}
else
{
long bytesToRead = entry.Count * TagDataTypeUtil.GetSizeInBytes(entry.Type);
// Skip any tags that are empty or larger than 2 GB.
if (bytesToRead == 0 || bytesToRead > int.MaxValue)
{
continue;
}
uint offset = entry.Offset;
if ((offset + bytesToRead) > reader.Length)
{
continue;
}
reader.Position = offset;
propertyData = reader.ReadBytes((int)bytesToRead);
if (swapNumberByteOrder)
{
// Paint.NET converts all multi-byte numbers to little-endian.
switch (entry.Type)
{
case TagDataType.Short:
case TagDataType.SShort:
propertyData = SwapShortArrayToLittleEndian(propertyData, entry.Count);
break;
case TagDataType.Long:
case TagDataType.SLong:
case TagDataType.Float:
propertyData = SwapLongArrayToLittleEndian(propertyData, entry.Count);
break;
case TagDataType.Rational:
case TagDataType.SRational:
propertyData = SwapRationalArrayToLittleEndian(propertyData, entry.Count);
break;
case TagDataType.Double:
propertyData = SwapDoubleArrayToLittleEndian(propertyData, entry.Count);
break;
case TagDataType.Byte:
case TagDataType.Ascii:
case TagDataType.Undefined:
case TagDataType.SByte:
default:
break;
}
}
}
metadataEntries.Add(new MetadataEntry(entry.Section, entry.Tag, entry.Type, propertyData));
}
return(metadataEntries);
}
private string GetValueStringFromOffset()
{
string valueString;
TagDataType type = this.entry.Type;
uint count = this.entry.Count;
uint offset = this.entry.Offset;
if (count == 0)
{
return(string.Empty);
}
int typeSizeInBytes = TagDataTypeUtil.GetSizeInBytes(type);
if (typeSizeInBytes == 1)
{
byte[] bytes = new byte[count];
if (this.offsetIsBigEndian)
{
switch (count)
{
case 1:
bytes[0] = (byte)((offset >> 24) & 0x000000ff);
break;
case 2:
bytes[0] = (byte)((offset >> 24) & 0x000000ff);
bytes[1] = (byte)((offset >> 16) & 0x000000ff);
break;
case 3:
bytes[0] = (byte)((offset >> 24) & 0x000000ff);
bytes[1] = (byte)((offset >> 16) & 0x000000ff);
bytes[2] = (byte)((offset >> 8) & 0x000000ff);
break;
case 4:
bytes[0] = (byte)((offset >> 24) & 0x000000ff);
bytes[1] = (byte)((offset >> 16) & 0x000000ff);
bytes[2] = (byte)((offset >> 8) & 0x000000ff);
bytes[3] = (byte)(offset & 0x000000ff);
break;
}
}
else
{
switch (count)
{
case 1:
bytes[0] = (byte)(offset & 0x000000ff);
break;
case 2:
bytes[0] = (byte)(offset & 0x000000ff);
bytes[1] = (byte)((offset >> 8) & 0x000000ff);
break;
case 3:
bytes[0] = (byte)(offset & 0x000000ff);
bytes[1] = (byte)((offset >> 8) & 0x000000ff);
bytes[2] = (byte)((offset >> 16) & 0x000000ff);
break;
case 4:
bytes[0] = (byte)(offset & 0x000000ff);
bytes[1] = (byte)((offset >> 8) & 0x000000ff);
bytes[2] = (byte)((offset >> 16) & 0x000000ff);
bytes[3] = (byte)((offset >> 24) & 0x000000ff);
break;
}
}
if (type == TagDataType.Ascii)
{
valueString = Encoding.ASCII.GetString(bytes).TrimEnd('\0');
}
else if (count == 1)
{
valueString = bytes[0].ToString(CultureInfo.InvariantCulture);
}
else
{
StringBuilder builder = new StringBuilder();
uint lastItemIndex = count - 1;
for (int i = 0; i < count; i++)
{
builder.Append(bytes[i].ToString(CultureInfo.InvariantCulture));
if (i < lastItemIndex)
{
builder.Append(",");
}
}
valueString = builder.ToString();
}
}
else if (typeSizeInBytes == 2)
{
ushort[] values = new ushort[count];
if (this.offsetIsBigEndian)
{
switch (count)
{
case 1:
values[0] = (ushort)((offset >> 16) & 0x0000ffff);
break;
case 2:
values[0] = (ushort)((offset >> 16) & 0x0000ffff);
values[1] = (ushort)(offset & 0x0000ffff);
break;
}
}
else
{
switch (count)
{
case 1:
values[0] = (ushort)(offset & 0x0000ffff);
break;
case 2:
values[0] = (ushort)(offset & 0x0000ffff);
values[1] = (ushort)((offset >> 16) & 0x0000ffff);
break;
}
}
if (count == 1)
{
switch (type)
{
case TagDataType.SShort:
valueString = ((short)values[0]).ToString(CultureInfo.InvariantCulture);
break;
case TagDataType.Short:
default:
valueString = values[0].ToString(CultureInfo.InvariantCulture);
break;
}
}
else
{
switch (type)
{
case TagDataType.SShort:
valueString = ((short)values[0]).ToString(CultureInfo.InvariantCulture) + "," +
((short)values[1]).ToString(CultureInfo.InvariantCulture);
break;
case TagDataType.Short:
default:
valueString = values[0].ToString(CultureInfo.InvariantCulture) + "," +
values[1].ToString(CultureInfo.InvariantCulture);
break;
}
}
}
else
{
valueString = offset.ToString(CultureInfo.InvariantCulture);
}
return(valueString);
}
