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PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 58 insertions, 0 deletions

diff --git a/pkg/bpf/input_bytes.go b/pkg/bpf/input_bytes.go
new file mode 100644
index 000000000..74af038eb
--- /dev/null
+++ b/pkg/bpf/input_bytes.go
@@ -0,0 +1,58 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bpf
+
+import (
+	"encoding/binary"
+)
+
+// InputBytes implements the Input interface by providing access to a byte
+// slice. Unaligned loads are supported.
+type InputBytes struct {
+	// Data is the data accessed through the Input interface.
+	Data []byte
+
+	// Order is the byte order the data is accessed with.
+	Order binary.ByteOrder
+}
+
+// Load32 implements Input.Load32.
+func (i InputBytes) Load32(off uint32) (uint32, bool) {
+	if uint64(off)+4 > uint64(len(i.Data)) {
+		return 0, false
+	}
+	return i.Order.Uint32(i.Data[int(off):]), true
+}
+
+// Load16 implements Input.Load16.
+func (i InputBytes) Load16(off uint32) (uint16, bool) {
+	if uint64(off)+2 > uint64(len(i.Data)) {
+		return 0, false
+	}
+	return i.Order.Uint16(i.Data[int(off):]), true
+}
+
+// Load8 implements Input.Load8.
+func (i InputBytes) Load8(off uint32) (uint8, bool) {
+	if uint64(off)+1 > uint64(len(i.Data)) {
+		return 0, false
+	}
+	return i.Data[int(off)], true
+}
+
+// Length implements Input.Length.
+func (i InputBytes) Length() uint32 {
+	return uint32(len(i.Data))
+}