New script to calculate FAT12 structure

2014-04-08 15:53:50 +02:00
parent a72df4ca16
commit 2443b27b72
1 changed files with 50 additions and 0 deletions
@@ -0,0 +1,50 @@
+#!/bin/env python
+
+curr = 0
+idx = 0
+byte = 0
+
+def push4bits(val):
+  global curr, idx, byte
+  val = val & 0x0f
+  curr += val << idx
+  idx += 4
+  if idx == 8:
+    print "0x%02X," % curr,
+    idx = 0
+    curr = 0
+    byte += 1
+    if byte % 16 == 0:
+      print
+
+cluster = 0
+
+def pushCluster(val):
+   global cluster
+   push4bits(val)
+   push4bits(val >> 4)
+   push4bits(val >> 8)
+   cluster += 1
+
+def pushFile(size):
+   sectors = size / 512
+   count = sectors / 8
+   for i in range(count-1):
+     pushCluster(cluster+1)
+   pushCluster(0xFFF)
+
+def pushDisk(eeprom, flash):
+  global curr, idx, byte, cluster
+  curr = idx = byte = cluster = 0
+  print "Disk with %dk EEPROM and %dk FLASH:" % (eeprom, flash)
+  pushCluster(0xFF8)
+  pushCluster(0xFFF)
+  pushFile(eeprom*1024)
+  pushFile(flash*1024)
+  while byte < 512:
+    push4bits(0)
+  print
+
+pushDisk(32, 512)
+pushDisk(64, 512)
+