def parse(buf, *args):
[type_length] = buf.unpack('>I')
med_type = buf.readBytes(type_length)
[rest_length] = buf.unpack('>I')
info = buf.readBytes(rest_length)
buf = SeqBuffer(info)
if rest_length >= 4 and buf.readTag(
) == b'FLSH' and med_type == 'vectorShape':
[sz2] = buf.unpack('>I')
half_expect(sz2, rest_length, "XmedCastType.sz2")
misc = buf.unpack('>24i')
[npoints] = buf.unpack('>I')
misc2 = buf.unpack('>35i')
[proplen] = buf.unpack('>I')
propname = buf.readBytes(proplen)
points = []
for i in range(npoints):
if i:
[vx] = buf.unpack('>i')
half_expect(vx, -0x80000000, 'XmedCastType.vx')
pdesc = buf.unpack('>6i')
points.append(pdesc)
[proplen] = buf.unpack('>I')
propname = buf.readBytes(proplen)
half_expect(buf.peek_bytes_left(), b'', 'XmedCastType.trailer')
print(
"DB| XmedCastType.parse: misc=%r npoints=%r misc2=%r, points=%r"
% (misc, npoints, misc2, points))
info = (misc, misc2, points)
return XmedCastType(med_type, info, *args)
def read_bytes(self):
file = self.file
file.seek(self.offset)
xheader = file.read(8)
buf = SeqBuffer(xheader, self.loader_context.is_little_endian)
tag = buf.readTag()
#[dummy_size] = buf.unpack('>i', '<i')
if tag != self.tag:
raise Exception("section header is actually %s, not %s as expected" % (tag, self.tag))
return file.read(self.size)
def read_bytes(self):
file = self.file
file.seek(self.offset)
xheader = file.read(8)
buf = SeqBuffer(xheader, self.loader_context.is_little_endian)
tag = buf.readTag()
#[dummy_size] = buf.unpack('>i', '<i')
if tag != self.tag:
raise Exception(
"section header is actually %s, not %s as expected" %
(tag, self.tag))
return file.read(self.size)
def find_and_read_section(f, tag_to_find, loader_context):
while True:
xheader = f.read(8)
buf = SeqBuffer(xheader, loader_context.is_little_endian)
tag = buf.readTag()
[size] = buf.unpack('>i', '<i')
print(" tag=%s" % tag)
if tag==tag_to_find:
blob = f.read(size)
return parse_mmap_section(blob, f, loader_context)
else:
f.seek(size, 1)
def find_and_read_section(f, tag_to_find, loader_context):
while True:
xheader = f.read(8)
buf = SeqBuffer(xheader, loader_context.is_little_endian)
tag = buf.readTag()
[size] = buf.unpack('>i', '<i')
print(" tag=%s" % tag)
if tag == tag_to_find:
blob = f.read(size)
return parse_mmap_section(blob, f, loader_context)
else:
f.seek(size, 1)
def parse_mmap_section(blob, file, loader_context):
buf = SeqBuffer(blob, loader_context.is_little_endian)
[v1,v2,nElems,nUsed,junkPtr,v3,freePtr] = buf.unpack('>HHiiiii', '<HHiiiii')
print("mmap header: %s" % [v1,v2,nElems,nUsed,junkPtr,v3,freePtr])
sections = []
for i in range(nUsed):
tag = buf.readTag()
[size, offset, w1,w2, link] = buf.unpack('>IIhhi', '<IIhhi')
#print("mmap entry: %s" % [tag, size, offset, w1,w2, link])
if tag=="free" or tag=="junk":
section = NullSection(tag)
else:
section = SectionImpl(tag, size, offset, file, loader_context)
sections.append(section)
return SectionMap(sections)
def parse_mmap_section(blob, file, loader_context):
buf = SeqBuffer(blob, loader_context.is_little_endian)
[v1, v2, nElems, nUsed, junkPtr, v3,
freePtr] = buf.unpack('>HHiiiii', '<HHiiiii')
print("mmap header: %s" % [v1, v2, nElems, nUsed, junkPtr, v3, freePtr])
sections = []
for i in range(nUsed):
tag = buf.readTag()
[size, offset, w1, w2, link] = buf.unpack('>IIhhi', '<IIhhi')
#print("mmap entry: %s" % [tag, size, offset, w1,w2, link])
if tag == b"free" or tag == b"junk":
section = NullSection(tag)
else:
section = SectionImpl(tag, size, offset, file, loader_context)
sections.append(section)
return SectionMap(sections)
def parse_assoc_table(blob, loader_context):
""" Takes a 'KEY*' section and returns an AssociationTable. """
buf = SeqBuffer(blob, loader_context.is_little_endian)
[v1,v2,nElems,nValid] = buf.unpack('>HHii', '<HHii')
print("KEY* header: %s" % [v1,v2,nElems,nValid])
# v1 = table start offset, v2 = table entry size?
atable = AssociationTable()
for i in range(nValid):
[owned_section_id, composite_id] = buf.unpack('>ii', '<ii')
tag = buf.readTag()
castlib_assoc_id = composite_id >> 16
owner_section_id = composite_id & 0xFFFF
print "DB| KEY* entry #%d: %s" % (i, [tag, owned_section_id, castlib_assoc_id, owner_section_id])
if owner_section_id == 1024:
atable.add_library_section(castlib_assoc_id, owned_section_id, tag)
else:
atable.add_cast_media(owner_section_id, owned_section_id, tag)
return atable
def parse_assoc_table(blob, loader_context):
""" Takes a 'KEY*' section and returns an AssociationTable. """
buf = SeqBuffer(blob, loader_context.is_little_endian)
[v1, v2, nElems, nValid] = buf.unpack('>HHii', '<HHii')
print("KEY* header: %s" % [v1, v2, nElems, nValid])
# v1 = table start offset, v2 = table entry size?
atable = AssociationTable()
for i in range(nValid):
[owned_section_id, composite_id] = buf.unpack('>ii', '<ii')
tag = buf.readTag()
castlib_assoc_id = composite_id >> 16
owner_section_id = composite_id & 0xFFFF
print("DB| KEY* entry #%d: %s" % (i, [
bytes(tag), owned_section_id, castlib_assoc_id, owner_section_id
]))
if owner_section_id == 1024:
atable.add_library_section(castlib_assoc_id, owned_section_id,
bytes(tag))
else:
atable.add_cast_media(owner_section_id, owned_section_id,
bytes(tag))
return atable
