/// <summary>
/// Repopulates the mappings from the given character set.
/// </summary>
/// <param name="characterSet">The character set to be read from.</param>
/// <param name="codes">A list of all numerical encodings in the font, sorted by index.</param>
public void ReadFrom(CharacterSet characterSet, IList <int> codes)
{
ushort code;
ushort index;
this.unknown = 0;
this.mappings.Clear();
IList <Character> chars = characterSet.Characters;
this.type = characterSet.MapType;
switch (this.MapType)
{
// Type 0: Codes and indices are assigned in ascending order
case CharacterMapType.Range:
this.startCode = (ushort)chars[0].Code;
this.endCode = (ushort)chars[chars.Count - 1].Code;
for (int i = 0; i < chars.Count; i++)
{
code = (ushort)chars[i].Code;
index = (ushort)codes.IndexOf(code);
this.mappings.Add(code, index);
}
break;
// Type 1: Codes are assigned in ascending order to the specified indices
case CharacterMapType.List:
this.startCode = (ushort)chars[0].Code;
this.endCode = (ushort)chars[chars.Count - 1].Code;
code = this.startCode;
for (int i = 0; i < chars.Count; i++, code++)
{
for (; chars[i].Code > code; code++)
{
this.mappings.Add(code, Blank);
}
index = (ushort)codes.IndexOf(code);
this.mappings.Add(code, index);
}
break;
// Type 2: Codes and indices are assigned individually
case CharacterMapType.Map:
this.startCode = 0x0000;
this.endCode = 0xFFFF;
for (int i = 0; i < chars.Count; i++)
{
code = (ushort)chars[i].Code;
index = (ushort)codes.IndexOf(code);
this.mappings.Add(code, index);
}
break;
}
}
private void Load(CharacterMapChunk map, CharacterWidthChunk widths, CharacterGlyphChunk glyphs)
{
this.characters = new List <Character>(map.Mappings.Count);
this.type = map.MapType;
foreach (int code in map.Mappings.Keys)
{
int index = map.Mappings[code];
if (index != Blank)
{
Character c = new Character(code, glyphs.Glyphs[index], widths.XOffsets[index], widths.Widths[index], widths.NextOffsets[index]);
this.characters.Add(c);
}
}
}
/// <summary>
/// Initializes a new instance of the CharacterSet class with the given map type and an empty character list.
/// </summary>
/// <param name="type">The character map type, which determines how the mappings are encoded in the saved file.</param>
public CharacterSet(CharacterMapType type)
{
this.characters = new List <Character>();
this.type = type;
}
/// <summary>
/// Initializes a new instance of the CharacterSet class with the given characters and map type.
/// </summary>
/// <param name="characters">The initial characters in the set.</param>
/// <param name="type">The character map type, which determines how the mappings are encoded in the saved file.</param>
public CharacterSet(IList <Character> characters, CharacterMapType type)
{
this.characters = new List <Character>(characters);
this.type = type;
}
/// <summary>
/// Reads the chunk from the given stream.
/// </summary>
/// <param name="stream">The stream from which to read the chunk.</param>
public override void ReadFrom(Stream stream)
{
// Read header
BinaryReader reader = new BinaryReader(stream);
int signature = reader.ReadInt32();
if (signature != Signature)
{
throw new FormatException("Chunk is not CMAP format.");
}
reader.ReadInt32(); // chunk size; ignore
this.startCode = reader.ReadUInt16();
this.endCode = reader.ReadUInt16();
this.type = (CharacterMapType)reader.ReadUInt16();
this.unknown = reader.ReadUInt16();
this.nextOffset = reader.ReadInt32();
// Read body
this.mappings.Clear();
switch (this.type)
{
/* Type 0: Assign codes and indices in ascending order
* Format: BBBB (B = baseIndex)
* Codes = startCode ... endCode
* Indices = baseIndex ... (baseIndex + (endCode - startCode))
*/
case CharacterMapType.Range:
for (ushort code = this.startCode, index = reader.ReadUInt16(); code <= this.endCode; code++, index++)
{
this.mappings.Add(code, index);
}
break;
/* Type 1: Assign codes in ascending order to specified indices
* Format: AAAABBBBCCCCDDDD (A = index1, B = index2, C = index3, etc.
* Set an index to FFFF to exclude it)
* Codes = startCode ... endCode
* Indices = index1, index2, index3, ..., indexN
*/
case CharacterMapType.List:
for (ushort code = this.startCode; code <= this.endCode; code++)
{
ushort index = reader.ReadUInt16();
this.mappings.Add(code, index);
}
break;
/* Type 2: Assign specified codes to specified indices
* Format: NNNNAAAABBBBCCCCDDDD (N = number of mappings, A = code1,
* B = index1, C = code2, D = index2, etc.)
* startCode = 0000, endCode = FFFF
* Format
* Codes = code1, code2 ... endCode
* Indices = index1, index2, index3, ..., indexN
*/
case CharacterMapType.Map:
ushort count = reader.ReadUInt16();
for (int i = 0; i < count; i++)
{
ushort code = reader.ReadUInt16();
ushort index = reader.ReadUInt16();
this.mappings.Add(code, index);
}
break;
}
while (reader.BaseStream.Position < RoundUp(reader.BaseStream.Position))
{
reader.ReadUInt16();
}
}
