From a6d083bb776ecd498e57450ef84c20e39ae604cf Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Wed, 4 Apr 2018 16:36:21 +0200
Subject: Add CMap processing scripts, and turn cmapdump into mutool.

A dumping script written in python.
A flattening script written in python (for easier editing).
A subsetting script written in shell to minimize CMaps by reusing subsets.

Use 'mutool cmapdump' to bootstrap or verify cmap dumps.
---
 scripts/cmapflatten.py | 108 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 scripts/cmapflatten.py

(limited to 'scripts/cmapflatten.py')

diff --git a/scripts/cmapflatten.py b/scripts/cmapflatten.py
new file mode 100644
index 00000000..8bb2193a
--- /dev/null
+++ b/scripts/cmapflatten.py
@@ -0,0 +1,108 @@
+# Parse a Uni* CMap file and flatten it.
+#
+# The Uni* CMap files only have 'cidchar' and 'cidrange' sections, never
+# 'bfchar' or 'bfrange'.
+
+import sys
+
+def flattencmap(filename):
+	codespacerange = []
+	usecmap = ""
+	cmapname = ""
+	cmapversion = "1.0"
+	csi_registry = "(Adobe)"
+	csi_ordering = "(Unknown)"
+	csi_supplement = 1
+	wmode = 0
+
+	map = {}
+
+	def tocode(s):
+		if s[0] == '<' and s[-1] == '>':
+			return int(s[1:-1], 16)
+		return int(s, 10)
+
+	def map_cidchar(lo, v):
+		map[lo] = v
+
+	def map_cidrange(lo, hi, v):
+		while lo <= hi:
+			map[lo] = v
+			lo = lo + 1
+			v = v + 1
+
+	current = None
+	for line in open(filename, "r").readlines():
+		if line[0] == '%':
+			continue
+		line = line.strip().split()
+		if len(line) == 0:
+			continue
+		if line[0] == '/CMapVersion': cmapversion = line[1]
+		elif line[0] == '/CMapName': cmapname = line[1][1:]
+		elif line[0] == '/WMode': wmode = int(line[1])
+		elif line[0] == '/Registry': csi_registry = line[1]
+		elif line[0] == '/Ordering': csi_ordering = line[1]
+		elif line[0] == '/Supplement': csi_supplement = line[1]
+		elif len(line) > 1 and line[1] == 'usecmap': usecmap = line[0][1:]
+		elif len(line) > 1 and line[1] == 'begincodespacerange': current = 'codespacerange'
+		elif len(line) > 1 and line[1] == 'begincidrange': current = 'cidrange'
+		elif len(line) > 1 and line[1] == 'begincidchar': current = 'cidchar'
+		elif line[0].startswith("end"):
+			current = None
+		elif current == 'codespacerange' and len(line) == 2:
+			n, a, b = (len(line[0])-2)/2, tocode(line[0]), tocode(line[1])
+			codespacerange.append((n, a, b))
+		elif current == 'cidrange' and len(line) == 3:
+			a, b, c = tocode(line[0]), tocode(line[1]), tocode(line[2])
+			map_cidrange(a, b, c)
+		elif current == 'cidchar' and len(line) == 2:
+			a, b = tocode(line[0]), tocode(line[1])
+			map_cidchar(a, b)
+
+	# Print flattened CMap file
+
+	print "%!PS-Adobe-3.0 Resource-CMap"
+	print "%%DocumentNeededResources: procset (CIDInit)"
+	print "%%IncludeResource: procset (CIDInit)"
+	print "%%%%BeginResource: CMap (%s)" % cmapname
+	print "%%%%Version: %s" % cmapversion
+	print "%%EndComments"
+	print "/CIDInit /ProcSet findresource begin"
+	print "12 dict begin"
+	print "begincmap"
+	if usecmap: print "/%s usecmap" % usecmap
+	print "/CIDSystemInfo 3 dict dup begin"
+	print "  /Registry %s def" % csi_registry
+	print "  /Ordering %s def" % csi_ordering
+	print "  /Supplement %s def" % csi_supplement
+	print "end def"
+	print "/CMapName /%s def" % cmapname
+	print "/CMapVersion %s def" % cmapversion
+	print "/CMapType 1 def"
+	print "/WMode %d def" % wmode
+
+	if len(codespacerange):
+		print "%d begincodespacerange" % len(codespacerange)
+		for r in codespacerange:
+			fmt = "<%%0%dx> <%%0%dx>" % (r[0]*2, r[0]*2)
+			print fmt % (r[1], r[2])
+		print "endcodespacerange"
+
+	keys = map.keys()
+	keys.sort()
+	print "%d begincidchar" % len(keys)
+	for code in keys:
+		v = map[code]
+		print "<%04x> %d" % (code, v)
+	print "endcidchar"
+
+	print "endcmap"
+	print "CMapName currentdict /CMap defineresource pop"
+	print "end"
+	print "end"
+	print "%%EndResource"
+	print "%%EOF"
+
+for arg in sys.argv[1:]:
+	flattencmap(arg)
-- 
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