From 0cbc79072dd661aad9fb764a04e6712d163126b5 Mon Sep 17 00:00:00 2001
From: Kelvin Sherlock <ksherlock@gmail.com>
Date: Thu, 29 Dec 2022 21:30:04 -0500
Subject: [PATCH] icon to rez

---
 icon.py | 153 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 icon.py

diff --git a/icon.py b/icon.py
new file mode 100644
index 0000000..1ea8453
--- /dev/null
+++ b/icon.py
@@ -0,0 +1,153 @@
+#
+# extract icons from an icon file.
+# outputs rez
+#
+# See FTN $CA
+
+import sys
+import getopt
+import struct
+
+
+class Icon:
+# Icon:
+# uint16_t IconType ($8000 = color, $0000 = b/w)
+# uint16_t IconSize
+# uint16_t IconHeight
+# uint16_t IconWidth
+# uint18_t IconImage[height * width / 2]
+# uint18_t IconMask[height * width / 2]
+
+	def __init__(self):
+		self.type = 0
+		self.size = 0
+		self.height = 0
+		self.width = 0
+		self.image = []
+		self.mask = []
+
+	def unpack_from(self, buffer, offset):
+		x = struct.unpack_from("<HHHH", buffer, offset)
+		self.type = x[0]
+		self.size = x[1]
+		self.height = x[2]
+		self.width = x[3]
+
+		offset = offset + 8
+		size = self.size
+		height = self.height
+		width = (self.width + 1) >> 1
+
+		data = buffer[offset:offset+size]
+		self.image = [ data[x*width:(x+1)*width] for x in range(0, height)]
+		offset += size
+
+		data = buffer[offset:offset+size]
+		self.mask = [ data[x*width:(x+1)*width] for x in range(0, height)]
+		offset += size
+
+		return offset
+
+class IconData:
+
+# uint16_t iDataLen
+# uint8_t iDataBoss[64]
+# uint8_t iDataName[16]
+# uint16_t iDataType
+# uint16_t iDataAux
+# Icon iDataBig
+# Icon iDataSmall
+#
+
+
+	def __init__(self):
+		self.len = 0
+		self.boss = ""
+		self.name = ""
+		self.type = 0
+		self.aux = 0
+		self.big = None
+		self.small = None
+
+	def unpack_from(self, buffer, offset):
+
+		l, = struct.unpack_from("<H", buffer, offset)
+		if l == 0:
+			self.len = 0
+			return offset
+
+		x = struct.unpack_from("<H64s16sHH", buffer, offset)
+		self.len = x[0]
+		self.boss = x[1]
+		self.name = x[2]
+		self.type = x[3]
+		self.aux = x[4]
+
+		offset = offset + 86
+
+		self.big = Icon()
+		self.small = Icon()
+
+		offset = self.big.unpack_from(buffer, offset)
+		offset = self.small.unpack_from(buffer, offset)
+
+		return offset
+
+ResID = 100
+
+def rez(icon):
+	global ResID
+
+	print("resource rIcon({}) {{".format(ResID))
+	ResID = ResID + 1
+
+	print("\t${:04x}, // type".format(icon.type))
+	print("\t{}, // height".format(icon.height))
+	print("\t{}, // width".format(icon.width))
+
+	# print(icon.image)
+	# print(icon.mask)
+	print()
+	for x in icon.image:
+		print("\t$\"{}\"".format(x.hex()))
+	print("\t,")
+	for x in icon.mask:
+		print("\t$\"{}\"".format(x.hex()))
+	print()
+	print("};")
+	print()
+
+
+def decompile(file):
+	with open(file, "rb") as io:
+		buffer = io.read()
+
+	offset = 26
+	# don't care about first 26-bytes
+
+	while True:
+
+		# print("offset:", offset)
+		icon = IconData()
+		offset = icon.unpack_from(buffer, offset)
+		if icon.len == 0: break;
+
+		rez(icon.big)
+		rez(icon.small)
+
+
+
+def usage(rv):
+	print("Usage: icon.py file")
+	sys.exit(rv)
+
+try:
+	opt, arg = getopt.getopt(sys.argv[1:], "")
+except getopt.GetoptError:
+    usage(2)
+
+if not len(arg):
+	usage(2)
+
+for file in arg:
+	decompile(file)