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Code Issues Releases Wiki Activity

Now reading blocks correctly

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This commit is contained in:
Ross Wilson
2016-02-05 10:44:59 +07:00
parent 0f026b295b
commit 6c3144373c
1 changed files with 22 additions and 6 deletions
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28
idasm/binimport.py
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@@ -61,6 +61,18 @@ def calc_checksum(csum, word):
return csum & 0xffff
def pyword(word):
"""Convert a 16bit value to a real python integer.
That is, convert 0xFFFF to -1.
"""
byte = (word >> 8) & 0xff
byte2 = word & 0xff
bstr = chr(byte) + chr(byte2)
return struct.unpack(">h", bstr)[0]
def dobody(f, mymem):
"""Read all of file after block loader.
@@ -81,6 +93,7 @@ def dobody(f, mymem):
# negative load address is end-of-file
ldaddr = readword(f)
print('read: ldaddr=%06o' % ldaddr)
print('ldaddr=%s' % str(ldaddr))
if ldaddr & 0x8000:
print('End load: ldaddr=%06o' % ldaddr)
break
@@ -88,11 +101,12 @@ def dobody(f, mymem):
# read data block, calculating checksum
csum = ldaddr # start checksum with base address
print('BLOCK: ldaddr=%06o, csum=%06o' % (ldaddr, csum))
neg_count = readword(f)
csum = (csum + neg_count) & 0xffff # add neg word count
print(' neg_count=%06o (%d), csum=%06o' % (neg_count, -neg_count, csum))
count = pyword(readword(f))
neg_count = pyword(count)
csum = (csum + count) & 0xffff # add neg word count
print(' neg_count=%06o, csum=%06o' % (neg_count&0xffff, csum))
csum_word = readword(f)
csum = (csum + csum_word) & 0xffff # add checksum word
csum = (csum + csum_word) & 0xffff # add checksum word
print(' csum_word=%06o, csum=%06o' % (csum_word, csum))
while neg_count < 0:
word = readword(f)
@@ -103,7 +117,7 @@ def dobody(f, mymem):
mymem.putOp(ldaddr, op)
mymem.putFld(ldaddr, fld)
ldaddr += 1
numwords += 1
neg_count += 1
csum &= 0xffff
if csum != 0:
#wx.MessageBox('Checksum error', 'Error', wx.OK | wx.ICON_ERROR)
@@ -167,10 +181,12 @@ def readword(f, first_byte=None):
f handle of the input file
first_byte value of first byte of word
Convert 16bit values to python integers
"""
if first_byte is None:
return (readbyte(f) << 8) + readbyte(f)
first_byte = readbyte(f)
return (first_byte << 8) + readbyte(f)