"""codefragments.py -- wrapper to modify code fragments."""
# 1998, Just van Rossum, Letterror
__version__ = "0.8b3"
__author__ = "jvr"
import macfs
import struct
import Res
import os
import sys
DEBUG = 0
error = "cfm.error"
BUFSIZE = 0x80000
def mergecfmfiles(srclist, dst, architecture = 'fat'):
"""Merge all files in srclist into a new file dst.
If architecture is given, only code fragments of that type will be used:
"pwpc" for PPC, "m68k" for cfm68k. This does not work for "classic"
68k code, since it does not use code fragments to begin with.
If architecture is None, all fragments will be used, enabling FAT binaries.
"""
srclist = list(srclist)
for i in range(len(srclist)):
if type(srclist[i]) == macfs.FSSpecType:
srclist[i] = srclist[i].as_pathname()
if type(dst) == macfs.FSSpecType:
dst = dst.as_pathname()
dstfile = open(dst, "wb")
rf = Res.FSpOpenResFile(dst, 3)
try:
dstcfrg = CfrgResource()
for src in srclist:
srccfrg = CfrgResource(src)
for frag in srccfrg.fragments:
if frag.architecture == 'pwpc' and architecture == 'm68k':
continue
if frag.architecture == 'm68k' and architecture == 'pwpc':
continue
dstcfrg.append(frag)
frag.copydata(dstfile)
cfrgres = Res.Resource(dstcfrg.build())
Res.UseResFile(rf)
cfrgres.AddResource('cfrg', 0, "")
finally:
dstfile.close()
rf = Res.CloseResFile(rf)
class CfrgResource:
def __init__(self, path = None):
self.version = 1
self.fragments = []
self.path = path
if path is not None and os.path.exists(path):
currentresref = Res.CurResFile()
resref = Res.FSpOpenResFile(path, 1)
Res.UseResFile(resref)
try:
try:
data = Res.Get1Resource('cfrg', 0).data
except Res.Error:
raise Res.Error, "no cfrg resource found", sys.exc_traceback
finally:
Res.CloseResFile(resref)
Res.UseResFile(currentresref)
self.parse(data)
if self.version <> 1:
raise error, "unknown 'cfrg' resource format"
def parse(self, data):
(res1, res2, self.version,
res3, res4, res5, res6,
self.memberCount) = struct.unpack("8l", data[:32])
data = data[32:]
while data:
frag = FragmentDescriptor(self.path, data)
data = data[frag.memberSize:]
self.fragments.append(frag)
def build(self):
self.memberCount = len(self.fragments)
data = struct.pack("8l", 0, 0, self.version, 0, 0, 0, 0, self.memberCount)
for frag in self.fragments:
data = data + frag.build()
return data
def append(self, frag):
self.fragments.append(frag)
class FragmentDescriptor:
def __init__(self, path, data = None):
self.path = path
if data is not None:
self.parse(data)
def parse(self, data):
self.architecture = data[:4]
( self.updatelevel,
self.currentVersion,
self.oldDefVersion,
self.stacksize,
self.applibdir,
self.fragtype,
self.where,
self.offset,
self.length,
self.res1, self.res2,
self.memberSize,) = struct.unpack("4lhBB4lh", data[4:42])
pname = data[42:self.memberSize]
self.name = pname[1:1+ord(pname[0])]
def build(self):
data = self.architecture
data = data + struct.pack("4lhBB4l",
self.updatelevel,
self.currentVersion,
self.oldDefVersion,
self.stacksize,
self.applibdir,
self.fragtype,
self.where,
self.offset,
self.length,
self.res1, self.res2)
self.memberSize = len(data) + 2 + 1 + len(self.name)
# pad to 4 byte boundaries
if self.memberSize % 4:
self.memberSize = self.memberSize + 4 - (self.memberSize % 4)
data = data + struct.pack("hb", self.memberSize, len(self.name))
data = data + self.name
data = data + '\000' * (self.memberSize - len(data))
return data
def getfragment(self):
if self.where <> 1:
raise error, "cant read fragment, unsupported location"
f = open(self.path, "rb")
f.seek(self.offset)
if self.length:
frag = f.read(self.length)
else:
frag = f.read()
f.close()
return frag
def copydata(self, outfile):
if self.where <> 1:
raise error, "cant read fragment, unsupported location"
infile = open(self.path, "rb")
if self.length == 0:
infile.seek(0, 2)
self.length = infile.tell()
# Position input file and record new offset from output file
infile.seek(self.offset)
# pad to 16 byte boundaries
offset = outfile.tell()
if offset % 16:
offset = offset + 16 - (offset % 16)
outfile.seek(offset)
self.offset = offset
l = self.length
while l:
if l > BUFSIZE:
outfile.write(infile.read(BUFSIZE))
l = l - BUFSIZE
else:
outfile.write(infile.read(l))
l = 0
infile.close()
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