def num_attr(ctx):
return ctx._.size / ctx._._.attr_size
perf_file_attr = Struct(
"perf_file_attr",
Array(
lambda ctx: num_attr(ctx),
Struct("f_attr", perf_event_attr, perf_file_section("ids", id_array))))
perf_event_types = Struct("perf_file_attr", Anchor("here"),
Padding(lambda ctx: ctx._.size))
perf_data = TunnelAdapter(Bytes("perf_data", lambda ctx: ctx.size),
GreedyRange(perf_event()))
#OnDemand(Bytes("perf_data", lambda ctx: ctx.size))
perf_file = Struct(
"perf_file_header",
# no support for version 1
Magic("PERFILE2"),
UNInt64("size"),
UNInt64("attr_size"),
perf_file_section("attrs", perf_file_attr),
perf_file_section("data", perf_data),
perf_file_section("event_types", perf_event_types),
# little endian
Embedded(
BitStruct(None, Flag("nrcpus"), Flag("arch"), Flag("version"),
def section_adapter(name, target):
return perf_file_section(
name, TunnelAdapter(String("data", lambda ctx: ctx.size), target))
"compression_methods",
UBInt8("length"), # TODO: Reject packets of length 0
Array(lambda ctx: ctx.length, UBInt8("compression_methods")),
)
ServerName = Struct(
"",
UBInt8("type"),
PascalString("name", length_field=UBInt16("length")),
)
SNIExtension = Struct(
"",
TunnelAdapter(
PascalString("server_names", length_field=UBInt16("length")),
TunnelAdapter(PascalString("", length_field=UBInt16("length")),
GreedyRange(ServerName)),
),
)
ALPNExtension = Struct(
"",
TunnelAdapter(
PascalString("alpn_protocols", length_field=UBInt16("length")),
TunnelAdapter(PascalString("", length_field=UBInt16("length")),
GreedyRange(PascalString("name"))),
),
)
UnknownExtension = Struct(
"", PascalString("bytes", length_field=UBInt16("extensions_length")))