commit ee0b39f2f3d8c7087fef73543d0a8b5704aad9cb
Author: Dreaded_X <tim.huizinga@gmail.com>
Date:   Thu Jan 14 02:30:58 2021 +0100

    Split tool from setup repository

diff --git a/create-disk.py b/create-disk.py
new file mode 100755
index 0000000..d2f7a70
--- /dev/null
+++ b/create-disk.py
@@ -0,0 +1,122 @@
+#!/usr/bin/env python3
+import math
+
+pageSize = 128
+sectorsPerTrack = 256
+blockSize = 16384
+pagesPerBlock = 128
+maxDirs = 128
+dirBlocks = 1
+
+
+def addBootloader(name):
+    loader = open(name, 'rb')
+    b = loader.read()
+
+    if len(b) > pageSize:
+        raise RuntimeError("Bootloader binary cannot be larger than one page")
+
+    out.seek(0)
+    out.write(b)
+
+def addOS(cpmName, biosName):
+    cpm = open(cpmName, 'rb')
+    bios = open(biosName, 'rb')
+
+    b = cpm.read()
+    out.seek(pageSize)
+    out.write(b)
+
+    b = bios.read()
+    out.seek(pageSize + 0x1600)
+    out.write(b)
+
+def seekBlock(i):
+    # Blocks start at track 1, sector 0
+    out.seek(pageSize*sectorsPerTrack + i*blockSize)
+
+def initDirs():
+    seekBlock(0)
+    out.write(bytearray(([0xe5] + [0x00] * 31) * maxDirs))
+
+fileCounter = 0
+allocationCounter = 1
+def addFile(filename, n, t):
+    global fileCounter
+    global allocationCounter
+
+    if fileCounter > maxDirs:
+        raise RuntimeError("Max dir entries has been reached")
+
+    if len(n) > 8:
+        raise RuntimeError("Filename cannot be longer than 8")
+
+    if len(t) > 3:
+        raise RuntimeError("Filetype cannot be longer than 3")
+
+    f = open(filename, 'rb')
+    b = f.read()
+
+    total_records = math.ceil(len(b)/pageSize)
+    records = (total_records - 1) % pagesPerBlock + 1
+    extends = math.ceil(total_records/pagesPerBlock)
+
+    if extends >= 8:
+        RuntimeError("File is to big to be stored in one entry, multple entries are not implemented")
+
+    seekBlock(0)
+    out.seek(32*fileCounter, 1)
+
+    # Write user (assume 0 for now)
+    out.write(bytearray(1))
+
+    # Write the name
+    out.write(n.upper().encode("ascii"))
+    out.write((" " * (8-len(n))).encode("ascii"))
+
+    # Write the type
+    out.write(t.upper().encode("ascii"))
+    out.write((" " * (3-len(t))).encode("ascii"))
+
+    # Write extend
+    # @todo This is actually wrong, as the order is EX S1 S2 with S1 being unused, however we never deal with files that big
+    out.write((extends-1).to_bytes(1, byteorder='little'))
+
+    # Reserved byte
+    out.write(bytearray(2))
+
+    # Number of records
+
+    out.write(records.to_bytes(1, byteorder='little'))
+
+    allocationCounterOld = allocationCounter
+    # We are assuming one block per file for now, so we can use fileCounter
+    for i in range(extends):
+        out.write(allocationCounter.to_bytes(2, byteorder='little'))
+        allocationCounter += 1
+
+    seekBlock(allocationCounterOld)
+    out.write(b)
+
+    fileCounter += 1
+
+
+def main():
+    # @todo Load the config from a file that we specify instead of hardcoding everything
+    # We can probably keep the os part hardcoded as that is not something we really need to change between different projects
+    global out
+    out = open('../tools/disk.img', 'wb')
+
+    addBootloader('../cpm/.build/loader.bin')
+    addOS('../cpm/.build/cpm22.bin', '../cpm/.build/bios.bin')
+
+    initDirs()
+
+    addFile("../cpm/.build/MONITOR.COM", "MONITOR", "COM")
+    addFile("../cpm/bin/STAT.COM", "STAT", "COM")
+    addFile("../cpm/bin/MBASIC.COM", "MBASIC", "COM")
+    addFile("../cpm/bin/s.com", "S", "COM")
+    # addFile("../xed/.build/XED.COM", "XED", "COM")
+
+if __name__ == "__main__":
+    main()