public FlacStream(string file, StreamMode mode, StreamAccessMode accessMode)
{
FileMode fileMode;
FileAccess fileAccessMode;
switch (mode)
{
case StreamMode.CreateNew:
{
fileMode = FileMode.Create;
break;
}
case StreamMode.OpenExisting:
{
fileMode = FileMode.Open;
break;
}
default:
{
throw new FlacDebugException();
}
}
switch (accessMode)
{
case StreamAccessMode.Read:
case StreamAccessMode.Write:
case StreamAccessMode.Both:
{
fileAccessMode = (FileAccess)accessMode;
break;
}
default:
{
throw new FlacDebugException();
}
}
fileStream_ = new FileStream(file, fileMode, fileAccessMode, FileShare.Read);
if ((accessMode & StreamAccessMode.Read) == StreamAccessMode.Read)
{
reader_ = new FlacStreamReader(fileStream_);
}
if ((accessMode & StreamAccessMode.Write) == StreamAccessMode.Write)
{
writer_ = new FlacStreamWriter(fileStream_);
}
}
public static byte[] ReadUtf8ULong(FlacStreamReader reader, out UInt64 decodedValue)
{
const int MAX_BITS_IN_STREAM = 7;
byte[] retVal = new byte[MAX_BITS_IN_STREAM];
UInt64 v = 0;
UInt32 x;
uint i;
x = reader.ReadByte();
retVal[0] = (byte)x;
if ((x & 0x80) == 0)
{ /* 0xxxxxxx */
v = x;
i = 0;
}
else if ((x & 0xC0) != 0 && (x & 0x20) == 0)
{ /* 110xxxxx */
v = x & 0x1F;
i = 1;
}
else if ((x & 0xE0) != 0 && (x & 0x10) == 0)
{ /* 1110xxxx */
v = x & 0x0F;
i = 2;
}
else if ((x & 0xF0) != 0 && (x & 0x08) == 0)
{ /* 11110xxx */
v = x & 0x07;
i = 3;
}
else if ((x & 0xF8) != 0 && (x & 0x04) == 0)
{ /* 111110xx */
v = x & 0x03;
i = 4;
}
else if ((x & 0xFC) != 0 && (x & 0x02) == 0)
{ /* 1111110x */
v = x & 0x01;
i = 5;
}
else if ((x & 0xFE) != 0 && (x & 0x01) == 0)
{ /* 11111110 */
v = 0;
i = 6;
}
else
{
decodedValue = 0xffffffffffffffff;
goto exit;
}
for (; i > 0; i--)
{
x = reader.ReadByte();
retVal[MAX_BITS_IN_STREAM - i] = (byte)x;
if ((x & 0x80) == 0 || (x & 0x40) != 0)
{ /* 10xxxxxx */
decodedValue = 0xffffffffffffffff;
goto exit;
}
v <<= 6;
v |= (x & 0x3F);
}
decodedValue = v;
exit:
return retVal;
}
