Modify parsing functions and config structs to accept hcl changes

Signed-off-by: Patrick Van Stee <patrick@vanstee.me>

vendor/github.com/zclconf/go-cty/cty/function/stdlib/bytes.go

@@ -0,0 +1,112 @@
+package stdlib
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/zclconf/go-cty/cty"
+	"github.com/zclconf/go-cty/cty/function"
+	"github.com/zclconf/go-cty/cty/gocty"
+)
+
+// Bytes is a capsule type that can be used with the binary functions to
+// support applications that need to support raw buffers in addition to
+// UTF-8 strings.
+var Bytes = cty.Capsule("bytes", reflect.TypeOf([]byte(nil)))
+
+// BytesVal creates a new Bytes value from the given buffer, which must be
+// non-nil or this function will panic.
+//
+// Once a byte slice has been wrapped in a Bytes capsule, its underlying array
+// must be considered immutable.
+func BytesVal(buf []byte) cty.Value {
+	if buf == nil {
+		panic("can't make Bytes value from nil slice")
+	}
+
+	return cty.CapsuleVal(Bytes, &buf)
+}
+
+// BytesLen is a Function that returns the length of the buffer encapsulated
+// in a Bytes value.
+var BytesLenFunc = function.New(&function.Spec{
+	Params: []function.Parameter{
+		{
+			Name:             "buf",
+			Type:             Bytes,
+			AllowDynamicType: true,
+		},
+	},
+	Type: function.StaticReturnType(cty.Number),
+	Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
+		bufPtr := args[0].EncapsulatedValue().(*[]byte)
+		return cty.NumberIntVal(int64(len(*bufPtr))), nil
+	},
+})
+
+// BytesSlice is a Function that returns a slice of the given Bytes value.
+var BytesSliceFunc = function.New(&function.Spec{
+	Params: []function.Parameter{
+		{
+			Name:             "buf",
+			Type:             Bytes,
+			AllowDynamicType: true,
+		},
+		{
+			Name:             "offset",
+			Type:             cty.Number,
+			AllowDynamicType: true,
+		},
+		{
+			Name:             "length",
+			Type:             cty.Number,
+			AllowDynamicType: true,
+		},
+	},
+	Type: function.StaticReturnType(Bytes),
+	Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
+		bufPtr := args[0].EncapsulatedValue().(*[]byte)
+
+		var offset, length int
+
+		var err error
+		err = gocty.FromCtyValue(args[1], &offset)
+		if err != nil {
+			return cty.NilVal, err
+		}
+		err = gocty.FromCtyValue(args[2], &length)
+		if err != nil {
+			return cty.NilVal, err
+		}
+
+		if offset < 0 || length < 0 {
+			return cty.NilVal, fmt.Errorf("offset and length must be non-negative")
+		}
+
+		if offset > len(*bufPtr) {
+			return cty.NilVal, fmt.Errorf(
+				"offset %d is greater than total buffer length %d",
+				offset, len(*bufPtr),
+			)
+		}
+
+		end := offset + length
+
+		if end > len(*bufPtr) {
+			return cty.NilVal, fmt.Errorf(
+				"offset %d + length %d is greater than total buffer length %d",
+				offset, length, len(*bufPtr),
+			)
+		}
+
+		return BytesVal((*bufPtr)[offset:end]), nil
+	},
+})
+
+func BytesLen(buf cty.Value) (cty.Value, error) {
+	return BytesLenFunc.Call([]cty.Value{buf})
+}
+
+func BytesSlice(buf cty.Value, offset cty.Value, length cty.Value) (cty.Value, error) {
+	return BytesSliceFunc.Call([]cty.Value{buf, offset, length})
+}