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Adding support for XZ compression #2

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Adding support for XZ compression #2

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11 changes: 10 additions & 1 deletion extract-symvers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
import struct
import sys
import StringIO
from subprocess import Popen, PIPE
from optparse import OptionParser

# gzip.GzipFile is being unhelpful trying to read another gzip
Expand Down Expand Up @@ -46,6 +47,11 @@ def __init__(self, file, base, endian, ptr_size):
# contain what looks like a gzip header much later.
if index != -1 and float(index) / len(kernel) < 0.01:
kernel = gzip.GzipFile(fileobj=StringIO.StringIO(kernel[index:])).read()
else:
index = kernel.rfind(b'\xfd\x37\x7a\x58\x5a\x00') # XZ marker
if index != -1 and float(index) / len(kernel) < 0.1:
p = Popen("xz -dc", shell=True, stdin=PIPE, stderr=PIPE, stdout=PIPE)
kernel = p.communicate(input=StringIO.StringIO(kernel[index:]).read())[0]
self.kernel = kernel
self.size = len(self.kernel)
self.base = base
Expand Down Expand Up @@ -91,14 +97,16 @@ def scan_symsearch(self):
raise ScanFailException()
off += 4
symsearch[EXPORT_TYPE[i]] = ptrs

# print "Offset = %x" % (offset)
return symsearch
except ScanFailException:
pass
# print "Offset = %x" % (offset)
offset += self.ptr_bytes

def symbols(self):
symsearch = self.scan_symsearch()
# print symsearch
for t, s in symsearch.items():
crc_off = s['crcs'] - self.base
for offset in range(s['start'] - self.base, s['stop'] - self.base, self.ptr_bytes * 2):
Expand Down Expand Up @@ -132,6 +140,7 @@ def main():
exit(1)

kernel = KernelImage(args[0], int(options.base, 16), options.endian, int(options.bits))
# print "Got the Kernel"
for s, crc, t in kernel.symbols():
print "0x%08x\t%s\tvmlinux\t%s" % (crc, s, t)

Expand Down