parser.pm

wireshark 0.99.7 最新源码

		if (ref($l->{DATA_TYPE}) eq "HASH") {
			$t = "$l->{DATA_TYPE}->{TYPE}_$l->{DATA_TYPE}->{NAME}";
		} else {
			$t = $l->{DATA_TYPE};
		}
				
		# strings are passed by value rather than reference
		if (not Parse::Pidl::Typelist::is_scalar($t) or 
			Parse::Pidl::Typelist::scalar_is_reference($t)) {
			$var_name = get_pointer_to($var_name);
		}

		my $ndr_flags = CalcNdrFlags($l, $primitives, $deferred);
		$self->pidl("NDR_CHECK(ndr_push_$t($ndr, $ndr_flags, $var_name));");
	} else {
		$self->ParseTypePush($l->{DATA_TYPE}, $var_name, $primitives, $deferred);
	}
}

sub CalcNdrFlags($$$)
{
	my ($l,$primitives,$deferred) = @_;

	my $scalars = 0;
	my $buffers = 0;

	# Add NDR_SCALARS if this one is deferred 
	# and deferreds may be pushed
	$scalars = 1 if ($l->{IS_DEFERRED} and $deferred);

	# Add NDR_SCALARS if this one is not deferred and 
	# primitives may be pushed
	$scalars = 1 if (!$l->{IS_DEFERRED} and $primitives);
	
	# Add NDR_BUFFERS if this one contains deferred stuff
	# and deferreds may be pushed
	$buffers = 1 if ($l->{CONTAINS_DEFERRED} and $deferred);

	return "NDR_SCALARS|NDR_BUFFERS" if ($scalars and $buffers);
	return "NDR_SCALARS" if ($scalars);
	return "NDR_BUFFERS" if ($buffers);
	return undef;
}

sub ParseMemCtxPullStart($$$$)
{
	my ($self, $e, $l, $ptr_name) = @_;

	my $mem_r_ctx = "_mem_save_$e->{NAME}_$l->{LEVEL_INDEX}";
	my $mem_c_ctx = $ptr_name;
	my $mem_c_flags = "0";

	return if ($l->{TYPE} eq "ARRAY" and $l->{IS_FIXED});

	if (($l->{TYPE} eq "POINTER") and ($l->{POINTER_TYPE} eq "ref")) {
		my $nl = GetNextLevel($e, $l);
		my $next_is_array = ($nl->{TYPE} eq "ARRAY");
		my $next_is_string = (($nl->{TYPE} eq "DATA") and 
					($nl->{DATA_TYPE} eq "string"));
		if ($next_is_array or $next_is_string) {
			return;
		} else {
			$mem_c_flags = "LIBNDR_FLAG_REF_ALLOC";
		}
	}

	$self->pidl("$mem_r_ctx = NDR_PULL_GET_MEM_CTX(ndr);");
	$self->pidl("NDR_PULL_SET_MEM_CTX(ndr, $mem_c_ctx, $mem_c_flags);");
}

sub ParseMemCtxPullEnd($$$)
{
	my ($self, $e, $l) = @_;

	my $mem_r_ctx = "_mem_save_$e->{NAME}_$l->{LEVEL_INDEX}";
	my $mem_r_flags = "0";

	return if ($l->{TYPE} eq "ARRAY" and $l->{IS_FIXED});

	if (($l->{TYPE} eq "POINTER") and ($l->{POINTER_TYPE} eq "ref")) {
		my $nl = GetNextLevel($e, $l);
		my $next_is_array = ($nl->{TYPE} eq "ARRAY");
		my $next_is_string = (($nl->{TYPE} eq "DATA") and 
					($nl->{DATA_TYPE} eq "string"));
		if ($next_is_array or $next_is_string) {
			return;
		} else {
			$mem_r_flags = "LIBNDR_FLAG_REF_ALLOC";
		}
	}

	$self->pidl("NDR_PULL_SET_MEM_CTX(ndr, $mem_r_ctx, $mem_r_flags);");
}

sub CheckStringTerminator($$$$$)
{
	my ($self,$ndr,$e,$l,$length) = @_;
	my $nl = GetNextLevel($e, $l);

	# Make sure last element is zero!
	$self->pidl("NDR_CHECK(ndr_check_string_terminator($ndr, $length, sizeof($nl->{DATA_TYPE}_t)));");
}

sub ParseElementPullLevel
{
	my($self,$e,$l,$ndr,$var_name,$env,$primitives,$deferred) = @_;

	my $ndr_flags = CalcNdrFlags($l, $primitives, $deferred);

	if ($l->{TYPE} eq "ARRAY" and ($l->{IS_VARYING} or $l->{IS_CONFORMANT})) {
		$var_name = get_pointer_to($var_name);
	}

	# Only pull something if there's actually something to be pulled
	if (defined($ndr_flags)) {
		if ($l->{TYPE} eq "SUBCONTEXT") {
			my $subndr = $self->ParseSubcontextPullStart($e, $l, $ndr, $env);
			$self->ParseElementPullLevel($e, GetNextLevel($e,$l), $subndr, $var_name, $env, 1, 1);
			$self->ParseSubcontextPullEnd($e, $l, $ndr, $env);
		} elsif ($l->{TYPE} eq "ARRAY") {
			my $length = $self->ParseArrayPullHeader($e, $l, $ndr, $var_name, $env);

			my $nl = GetNextLevel($e, $l);

			if (is_charset_array($e,$l)) {
				if ($l->{IS_ZERO_TERMINATED}) {
					$self->CheckStringTerminator($ndr, $e, $l, $length);
				}
				$self->pidl("NDR_CHECK(ndr_pull_charset($ndr, $ndr_flags, ".get_pointer_to($var_name).", $length, sizeof(" . mapTypeName($nl->{DATA_TYPE}) . "), CH_$e->{PROPERTIES}->{charset}));");
				return;
			} elsif (has_fast_array($e, $l)) {
				if ($l->{IS_ZERO_TERMINATED}) {
					$self->CheckStringTerminator($ndr,$e,$l,$length);
				}
				$self->pidl("NDR_CHECK(ndr_pull_array_$nl->{DATA_TYPE}($ndr, $ndr_flags, $var_name, $length));");
				return;
			}
		} elsif ($l->{TYPE} eq "POINTER") {
			$self->ParsePtrPull($e, $l, $ndr, $var_name);
		} elsif ($l->{TYPE} eq "SWITCH") {
			$self->ParseSwitchPull($e, $l, $ndr, $var_name, $env);
		} elsif ($l->{TYPE} eq "DATA") {
			$self->ParseDataPull($e, $l, $ndr, $var_name, $primitives, $deferred);
		}
	}

	# add additional constructions
	if ($l->{TYPE} eq "POINTER" and $deferred) {
		if ($l->{POINTER_TYPE} ne "ref") {
			$self->pidl("if ($var_name) {");
			$self->indent;

			if ($l->{POINTER_TYPE} eq "relative") {
				$self->pidl("uint32_t _relative_save_offset;");
				$self->pidl("_relative_save_offset = ndr->offset;");
				$self->pidl("NDR_CHECK(ndr_pull_relative_ptr2(ndr, $var_name));");
			}
		}

		$self->ParseMemCtxPullStart($e, $l, $var_name);

		$var_name = get_value_of($var_name);
		$self->ParseElementPullLevel($e, GetNextLevel($e,$l), $ndr, $var_name, $env, 1, 1);

		$self->ParseMemCtxPullEnd($e,$l);

		if ($l->{POINTER_TYPE} ne "ref") {
    			if ($l->{POINTER_TYPE} eq "relative") {
				$self->pidl("ndr->offset = _relative_save_offset;");
			}
			$self->deindent;
			$self->pidl("}");
		}
	} elsif ($l->{TYPE} eq "ARRAY" and 
			not has_fast_array($e,$l) and not is_charset_array($e, $l)) {
		my $length = ParseExpr($l->{LENGTH_IS}, $env, $e->{ORIGINAL});
		my $counter = "cntr_$e->{NAME}_$l->{LEVEL_INDEX}";
		my $array_name = $var_name;

		$var_name = $var_name . "[$counter]";

		$self->ParseMemCtxPullStart($e, $l, $array_name);

		if (($primitives and not $l->{IS_DEFERRED}) or ($deferred and $l->{IS_DEFERRED})) {
			my $nl = GetNextLevel($e,$l);

			if ($l->{IS_ZERO_TERMINATED}) {
				$self->CheckStringTerminator($ndr,$e,$l,$length);
			}

			$self->pidl("for ($counter = 0; $counter < $length; $counter++) {");
			$self->indent;
			$self->ParseElementPullLevel($e, $nl, $ndr, $var_name, $env, 1, 0);
			$self->deindent;
			$self->pidl("}");
		}

		if ($deferred and ContainsDeferred($e, $l)) {
			$self->pidl("for ($counter = 0; $counter < $length; $counter++) {");
			$self->indent;
			$self->ParseElementPullLevel($e,GetNextLevel($e,$l), $ndr, $var_name, $env, 0, 1);
			$self->deindent;
			$self->pidl("}");
		}

		$self->ParseMemCtxPullEnd($e, $l);

	} elsif ($l->{TYPE} eq "SWITCH") {
		$self->ParseElementPullLevel($e, GetNextLevel($e,$l), $ndr, $var_name, $env, $primitives, $deferred);
	}
}

#####################################################################
# parse scalars in a structure element - pull size
sub ParseElementPull($$$$$$)
{
	my($self,$e,$ndr,$env,$primitives,$deferred) = @_;

	my $var_name = $env->{$e->{NAME}};
	my $represent_name;
	my $transmit_name;

	return unless $primitives or ($deferred and ContainsDeferred($e, $e->{LEVELS}[0]));

	if ($e->{REPRESENTATION_TYPE} ne $e->{TYPE}) {
		$self->pidl("{");
		$self->indent;
		$represent_name = $var_name;
		$transmit_name = "_transmit_$e->{NAME}";
		$var_name = $transmit_name;
		$self->pidl(mapTypeName($e->{TYPE})." $var_name;");
	}

	$var_name = append_prefix($e, $var_name);

	$self->start_flags($e);

	$self->ParseElementPullLevel($e,$e->{LEVELS}[0],$ndr,$var_name,$env,$primitives,$deferred);

	$self->end_flags($e);

	# Representation type is different from transmit_as
	if ($e->{REPRESENTATION_TYPE} ne $e->{TYPE}) {
		$self->pidl("NDR_CHECK(ndr_$e->{TYPE}_to_$e->{REPRESENTATION_TYPE}($transmit_name, ".get_pointer_to($represent_name)."));");
		$self->deindent;
		$self->pidl("}");
	}
}

#####################################################################
# parse a pointer in a struct element or function
sub ParsePtrPull($$$$$)
{
	my($self, $e,$l,$ndr,$var_name) = @_;

	my $nl = GetNextLevel($e, $l);
	my $next_is_array = ($nl->{TYPE} eq "ARRAY");
	my $next_is_string = (($nl->{TYPE} eq "DATA") and 
						 ($nl->{DATA_TYPE} eq "string"));

	if ($l->{POINTER_TYPE} eq "ref") {
		if ($l->{LEVEL} eq "EMBEDDED") {
			$self->pidl("NDR_CHECK(ndr_pull_ref_ptr($ndr, &_ptr_$e->{NAME}));");
		}

		if (!$next_is_array and !$next_is_string) {
			$self->pidl("if (ndr->flags & LIBNDR_FLAG_REF_ALLOC) {");
			$self->pidl("\tNDR_PULL_ALLOC($ndr, $var_name);"); 
			$self->pidl("}");
		}
		
		return;
	} elsif (($l->{POINTER_TYPE} eq "unique") or 
		 ($l->{POINTER_TYPE} eq "relative") or
		 ($l->{POINTER_TYPE} eq "full")) {
		$self->pidl("NDR_CHECK(ndr_pull_generic_ptr($ndr, &_ptr_$e->{NAME}));");
		$self->pidl("if (_ptr_$e->{NAME}) {");
		$self->indent;
	} else {
		die("Unhandled pointer type $l->{POINTER_TYPE}");
	}

	# Don't do this for arrays, they're allocated at the actual level 
	# of the array
	unless ($next_is_array or $next_is_string) { 
		$self->pidl("NDR_PULL_ALLOC($ndr, $var_name);"); 
	} else {
		# FIXME: Yes, this is nasty.
		# We allocate an array twice
		# - once just to indicate that it's there,
		# - then the real allocation...
		$self->pidl("NDR_PULL_ALLOC($ndr, $var_name);");
	}

	#$self->pidl("memset($var_name, 0, sizeof($var_name));");
	if ($l->{POINTER_TYPE} eq "relative") {
		$self->pidl("NDR_CHECK(ndr_pull_relative_ptr1($ndr, $var_name, _ptr_$e->{NAME}));");
	}
	$self->deindent;
	$self->pidl("} else {");
	$self->pidl("\t$var_name = NULL;");
	$self->pidl("}");
}

sub ParseStructPushPrimitives($$$$)
{
	my ($self, $struct, $varname, $env) = @_;

	# see if the structure contains a conformant array. If it
	# does, then it must be the last element of the structure, and
	# we need to push the conformant length early, as it fits on
	# the wire before the structure (and even before the structure
	# alignment)
	if (defined($struct->{SURROUNDING_ELEMENT})) {
		my $e = $struct->{SURROUNDING_ELEMENT};

		if (defined($e->{LEVELS}[0]) and 
			$e->{LEVELS}[0]->{TYPE} eq "ARRAY") {
			my $size;
			
			if ($e->{LEVELS}[0]->{IS_ZERO_TERMINATED}) {
				if (has_property($e, "charset")) {
					$size = "ndr_charset_length($varname->$e->{NAME}, CH_$e->{PROPERTIES}->{charset})";
				} else {
					$size = "ndr_string_length($varname->$e->{NAME}, sizeof(*$varname->$e->{NAME}))";
				}
			} else {
				$size = ParseExpr($e->{LEVELS}[0]->{SIZE_IS}, $env, $e->{ORIGINAL});
			}

			$self->pidl("NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, $size));");
		} else {
			$self->pidl("NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, ndr_string_array_size(ndr, $varname->$e->{NAME})));");
		}
	}

	$self->pidl("NDR_CHECK(ndr_push_align(ndr, $struct->{ALIGN}));");

	if (defined($struct->{PROPERTIES}{relative_base})) {
		# set the current offset as base for relative pointers
		# and store it based on the toplevel struct/union
		$self->pidl("NDR_CHECK(ndr_push_setup_relative_base_offset1(ndr, $varname, ndr->offset));");
	}

	$self->ParseElementPush($_, "ndr", $env, 1, 0) foreach (@{$struct->{ELEMENTS}});
}

sub ParseStructPushDeferred($$$)
{
	my ($self, $struct, $varname, $env) = @_;
	if (defined($struct->{PROPERTIES}{relative_base})) {
		# retrieve the current offset as base for relative pointers
		# based on the toplevel struct/union
		$self->pidl("NDR_CHECK(ndr_push_setup_relative_base_offset2(ndr, $varname));");
	}
	$self->ParseElementPush($_, "ndr", $env, 0, 1) foreach (@{$struct->{ELEMENTS}});
}

#####################################################################
# parse a struct
sub ParseStructPush($$$)
{
	my ($self, $struct, $varname) = @_;
	
	return unless defined($struct->{ELEMENTS});

	my $env = GenerateStructEnv($struct, $varname);

	EnvSubstituteValue($env, $struct);

	$self->DeclareArrayVariables($_) foreach (@{$struct->{ELEMENTS}});

	$self->start_flags($struct);

	$self->pidl("if (ndr_flags & NDR_SCALARS) {");
	$self->indent;
	$self->ParseStructPushPrimitives($struct, $varname, $env);
	$self->deindent;
	$self->pidl("}");

	$self->pidl("if (ndr_flags & NDR_BUFFERS) {");
	$self->indent;
	$self->ParseStructPushDeferred($struct, $varname, $env);
	$self->deindent;
	$self->pidl("}");

	$self->end_flags($struct);
}

#####################################################################
# generate a push function for an enum
sub ParseEnumPush($$$)
{
	my($self,$enum,$varname) = @_;
	my($type_fn) = $enum->{BASE_TYPE};

	$self->start_flags($enum);
	$self->pidl("NDR_CHECK(ndr_push_$type_fn(ndr, NDR_SCALARS, $varname));");
	$self->end_flags($enum);
}

#####################################################################
# generate a pull function for an enum
sub ParseEnumPull($$$)
{
	my($self,$enum,$varname) = @_;
	my($type_fn) = $enum->{BASE_TYPE};
	my($type_v_decl) = mapTypeName($type_fn);

	$self->pidl("$type_v_decl v;");
	$self->start_flags($enum);
	$self->pidl("NDR_CHECK(ndr_pull_$type_fn(ndr, NDR_SCALARS, &v));");
	$self->pidl("*$varname = v;");

	$self->end_flags($enum);
}

#####################################################################
# generate a print function for an enum
sub ParseEnumPrint($$$$)
{
	my($self,$enum,$name,$varname) = @_;

	$self->pidl("const char *val = NULL;");
	$self->pidl("");

	$self->start_flags($enum);

	$self->pidl("switch ($varname) {");
	$self->indent;
	my $els = \@{$enum->{ELEMENTS}};
	foreach my $i (0 .. $#{$els}) {
		my $e = ${$els}[$i];
		chomp $e;
		if ($e =~ /^(.*)=/) {
			$e = $1;
		}
		$self->pidl("case $e: val = \"$e\"; break;");
	}

	$self->deindent;
	$self->pidl("}");
	
	$self->pidl("ndr_print_enum(ndr, name, \"$enum->{TYPE}\", val, $varname);");

	$self->end_flags($enum);
}

sub DeclEnum($$$$)
{
	my ($e,$t,$name,$varname) = @_;
	return "enum $name " . 
		($t eq "pull"?"*":"") . $varname;
}

$typefamily{ENUM} = {
	DECL => \&DeclEnum,
	PUSH_FN_BODY => \&ParseEnumPush,
	PULL_FN_BODY => \&ParseEnumPull,
	PRINT_FN_BODY => \&ParseEnumPrint,
};

#####################################################################
# generate a push function for a bitmap
sub ParseBitmapPush($$$)
{
	my($self,$bitmap,$varname) = @_;
	my($type_fn) = $bitmap->{BASE_TYPE};

	$self->start_flags($bitmap);

	$self->pidl("NDR_CHECK(ndr_push_$type_fn(ndr, NDR_SCALARS, $varname));");