/// <summary>
/// Overriden to create CMap content stream.
/// </summary>
/// <param name="writer"></param>
protected internal override void Write(PdfWriter writer)
{
WriteLine("/CIDInit /ProcSet findresource begin");
WriteLine("12 dict begin");
WriteLine("begincmap");
WriteLine("/CIDSystemInfo");
WriteLine(systemInfo);
WriteLine("def");
WriteLine(String.Format("/CMapName /{0} def", DefaultName));
WriteLine("/CMapType 2 def");
// No bfranges represents an error - we should really through an exception
if (ranges.Count > 0)
{
// Groups CMap entries into bfranges
BfEntryList groups = GroupCMapEntries();
// Write out the codespace ranges
WriteCodespaceRange(groups);
// Write out GID to Unicode mappings
WriteBfChars(groups);
WriteBfRanges(groups);
}
WriteLine("endcmap");
WriteLine("CMapName currentdict /CMap defineresource pop");
WriteLine("end");
Write("end");
base.Write(writer);
}
private BfEntryList GroupCMapEntries()
{
// List of grouped bfranges
BfEntryList groups = new BfEntryList();
ushort prevGlyphIndex = (ushort)ranges.GetKey(0);
ushort prevUnicodeValue = (ushort)ranges[prevGlyphIndex];
BfEntry range = new BfEntry(prevGlyphIndex, prevUnicodeValue);
groups.Add(range);
for (int i = 1; i < ranges.Count; i++)
{
ushort glyphIndex = (ushort)ranges.GetKey(i);
ushort unicodeValue = (ushort)ranges[glyphIndex];
if (unicodeValue == prevUnicodeValue + 1 &&
glyphIndex == prevGlyphIndex + 1)
{
// Contingous block - use existing range
range.IncrementEndIndex();
}
else
{
// Non-contiguous block - start new range
range = new BfEntry(glyphIndex, unicodeValue);
groups.Add(range);
}
prevGlyphIndex = glyphIndex;
prevUnicodeValue = unicodeValue;
}
return(groups);
}
/// <summary>
/// Writes the bfrange entries to the content stream in groups of 100.
/// </summary>
/// <param name="entries"></param>
private void WriteBfRanges(BfEntryList entries)
{
// bfrange entries must be grouped in blocks of 100
BfEntry[] rangeEntries = entries.Ranges;
int numBlocks = (rangeEntries.Length / 100) + (((rangeEntries.Length % 100) > 0) ? 1 : 0);
for (int i = 0; i < numBlocks; i++)
{
int blockSize = 0;
if ((i + 1) == numBlocks)
{
blockSize = rangeEntries.Length - (i * 100);
}
else
{
blockSize = 100;
}
WriteLine(String.Format("{0} beginbfrange", blockSize));
for (int j = 0; j < blockSize; j++)
{
BfEntry entry = rangeEntries[(i * 100) + j];
WriteLine(String.Format("<{0:X4}> <{1:X4}> <{2:X4}>",
entry.StartGlyphIndex,
entry.EndGlyphIndex,
entry.UnicodeValue));
}
WriteLine("endbfrange");
}
}
private void WriteCodespaceRange(BfEntryList entries)
{
BfEntry first = entries[0];
BfEntry last = entries[entries.Count - 1];
WriteLine("1 begincodespacerange");
WriteLine(String.Format("<{0:X4}> <{1:X4}>",
first.StartGlyphIndex, last.EndGlyphIndex));
WriteLine("endcodespacerange");
}
private void WriteCodespaceRange(BfEntryList entries)
{
BfEntry first = entries[0];
BfEntry last = entries[entries.Count - 1];
WriteLine("1 begincodespacerange");
WriteLine(String.Format("<{0:X4}> <{1:X4}>",
first.StartGlyphIndex, last.EndGlyphIndex));
WriteLine("endcodespacerange");
}
private BfEntryList GroupCMapEntries()
{
// List of grouped bfranges
BfEntryList groups = new BfEntryList();
ushort prevGlyphIndex = (ushort)ranges.GetKey(0);
ushort prevUnicodeValue = (ushort)ranges[prevGlyphIndex];
BfEntry range = new BfEntry(prevGlyphIndex, prevUnicodeValue);
groups.Add(range);
for (int i = 1; i < ranges.Count; i++)
{
ushort glyphIndex = (ushort)ranges.GetKey(i);
ushort unicodeValue = (ushort)ranges[glyphIndex];
if (unicodeValue == prevUnicodeValue + 1 &&
glyphIndex == prevGlyphIndex + 1)
{
// Contingous block - use existing range
range.IncrementEndIndex();
}
else
{
// Non-contiguous block - start new range
range = new BfEntry(glyphIndex, unicodeValue);
groups.Add(range);
}
prevGlyphIndex = glyphIndex;
prevUnicodeValue = unicodeValue;
}
return groups;
}
/// <summary>
/// Writes the bfrange entries to the content stream in groups of 100.
/// </summary>
/// <param name="entries"></param>
private void WriteBfRanges(BfEntryList entries)
{
// bfrange entries must be grouped in blocks of 100
BfEntry[] rangeEntries = entries.Ranges;
int numBlocks = (rangeEntries.Length / 100) + (((rangeEntries.Length % 100) > 0) ? 1 : 0);
for (int i = 0; i < numBlocks; i++)
{
int blockSize = 0;
if ((i + 1) == numBlocks)
{
blockSize = rangeEntries.Length - (i * 100);
}
else
{
blockSize = 100;
}
WriteLine(String.Format("{0} beginbfrange", blockSize));
for (int j = 0; j < blockSize; j++)
{
BfEntry entry = rangeEntries[(i * 100) + j];
WriteLine(String.Format("<{0:X4}> <{1:X4}> <{2:X4}>",
entry.StartGlyphIndex,
entry.EndGlyphIndex,
entry.UnicodeValue));
}
WriteLine("endbfrange");
}
}