//private static void DecodeLine(Stream stream, out HelpLine line)
//{
// line = null;
// // Read text length in bytes.
// int textLength = stream.ReadByte();
// if (textLength < 0)
// throw new EndOfStreamException("Cannot read text length byte.");
// byte[] textBytes = new byte[textLength];
// stream.ReadFull(textBytes, 0, textBytes.Length);
// string text = Graphic437.GetString(textBytes);
// line = new HelpLine(text);
// // Read byte count of attributes.
// int attrLength = reader.ReadByte();
// BufferReader attrReader = reader.ReadBuffer(attrLength - 1);
// DecodeLineAttributes(line, attrReader);
// // Read hyperlinks.
// while (!attrReader.IsEOF)
// {
// DecodeLineHyperlink(line, attrReader);
// }
//}
private static void DecodeLineAttributes(HelpLine line, BufferReader reader)
{
int charIndex = 0;
for (int chunkIndex = 0; !reader.IsEOF; chunkIndex++)
{
TextStyle textStyle = TextStyle.None;
// Read attribute byte except for the first chunk (for which
// default attributes are applied).
if (chunkIndex > 0)
{
byte a = reader.ReadByte();
if (a == 0xFF) // marks the beginning of hyperlinks
{
break;
}
textStyle = TextStyle.None;
if ((a & 1) != 0)
{
textStyle |= TextStyle.Bold;
}
if ((a & 2) != 0)
{
textStyle |= TextStyle.Italic;
}
if ((a & 4) != 0)
{
textStyle |= TextStyle.Underline;
}
if ((a & 0xF8) != 0)
{
// should exit
//System.Diagnostics.Debug.WriteLine(string.Format(
// "Text attribute bits {0:X2} is not recognized and is ignored.",
// a & 0xF8));
throw new InvalidDataException("Invalid text attribute");
}
}
// Read chunk length to apply this attribute to.
int charCount = reader.ReadByte();
if (charCount > line.Length - charIndex)
{
// TODO: issue warning
charCount = line.Length - charIndex;
}
if (textStyle != TextStyle.None)
{
for (int j = 0; j < charCount; j++)
{
line.Attributes[charIndex + j] = new TextAttribute(textStyle, null);
}
}
charIndex += charCount;
}
}
internal static void DecodeLine(BufferReader reader, out HelpLine line)
{
line = null;
// Read text length in bytes.
int textLength = reader.ReadByte();
string text = reader.ReadFixedLengthString(textLength - 1);
line = new HelpLine(text);
// Read byte count of attributes.
int attrLength = reader.ReadByte();
BufferReader attrReader = reader.ReadBuffer(attrLength - 1);
DecodeLineAttributes(line, attrReader);
// Read hyperlinks.
while (!attrReader.IsEOF)
{
DecodeLineHyperlink(line, attrReader);
}
}
private static void DecodeLineHyperlink(HelpLine line, BufferReader reader)
{
// Read link location.
int linkStartIndex = reader.ReadByte(); // one-base, inclusive
int linkEndIndex = reader.ReadByte(); // one-base, inclusive
if (linkStartIndex == 0 || linkStartIndex > linkEndIndex)
{
throw new InvalidDataException("Invalid link location.");
}
if (linkEndIndex > line.Length)
{
System.Diagnostics.Debug.WriteLine(string.Format(
"WARNING: Link end {0} is past line end {1}.",
linkEndIndex, line.Length));
linkEndIndex = line.Length;
}
//if (linkStartIndex
// Read NULL-terminated context string.
string context = reader.ReadNullTerminatedString();
if (context == "") // link is WORD topic index
{
int numContext = reader.ReadUInt16(); // 0x8000 | topicIndex
context = "@L" + numContext.ToString("X4");
}
// Add hyperlink to the line.
HelpUri link = new HelpUri(context);
for (int j = linkStartIndex; j <= linkEndIndex; j++)
{
line.Attributes[j - 1] = new TextAttribute(line.Attributes[j - 1].Style, link);
}
}
