design/pdl-language.md

@@ -7,12 +7,12 @@ PDL allows defining a protocol using HOPP and TAPE.
 | Syntax     | TN      | CN | Description
 | ---------- | ------- | -: | -----------
 | I5         | SI      |    |   
-| I8         | LI      |  0 | 
+| I8         | LSI     |  0 | 
-| I16        | LI      |  1 | 
+| I16        | LSI     |  1 | 
-| I32        | LI      |  3 | 
+| I32        | LSI     |  3 | 
-| I64        | LI      |  7 | 
+| I64        | LSI     |  7 | 
-| I128[^2]   | LI      | 15 | 
+| I128[^2]   | LSI     | 15 | 
-| I256[^2]   | LI      | 31 | 
+| I256[^2]   | LSI     | 31 | 
 | U5         | SI      |    | 
 | U8         | LI      |  0 | 
 | U16        | LI      |  1 | 

generate/generate.go

@@ -308,7 +308,7 @@ func (this *Generator) generateEncodeValue(typ Type, valueSource, tagSource stri
 	switch typ := typ.(type) {
 	case TypeInt:
 		// SI:     (none)
-		// LI: <value: IntN>
+		// LI/LSI: <value: IntN>
 		if typ.Bits <= 5 {
 			// SI stores the value in the tag, so we write nothing here
 			break
@@ -479,7 +479,7 @@ func (this *Generator) generateDecodeValue(typ Type, typeName, valueSource, tagS
 	switch typ := typ.(type) {
 	case TypeInt:
 		// SI:     (none)
-		// LI: <value: IntN>
+		// LI/LSI: <value: IntN>
 		if typ.Bits <= 5 {
 			// SI stores the value in the tag
 			nn, err := this.iprintf("*%s = uint8(%s.CN())\n", valueSource, tagSource)
@@ -837,6 +837,9 @@ func (this *Generator) generateTag(typ Type, source string) (n int, err error) {
 		if typ.Bits <= 5 {
 			nn, err := this.printf("tape.SI.WithCN(int(%s))", source)
 			n += nn; if err != nil { return n, err }
+		} else if typ.Signed {
+			nn, err := this.printf("tape.LSI.WithCN(%d)", bitsToCN(typ.Bits))
+			n += nn; if err != nil { return n, err }
 		} else {
 			nn, err := this.printf("tape.LI.WithCN(%d)", bitsToCN(typ.Bits))
 			n += nn; if err != nil { return n, err }
@@ -881,6 +884,9 @@ func (this *Generator) generateTN(typ Type) (n int, err error) {
 		if typ.Bits <= 5 {
 			nn, err := this.printf("tape.SI")
 			n += nn; if err != nil { return n, err }
+		} else if typ.Signed {
+			nn, err := this.printf("tape.LSI")
+			n += nn; if err != nil { return n, err }
 		} else {
 			nn, err := this.printf("tape.LI")
 			n += nn; if err != nil { return n, err }

generate/generate_test.go

@@ -230,6 +230,26 @@ func TestGenerateRun(test *testing.T) {
 		Name: "NestedArray",
 		Type: TypeArray { Element: TypeArray { Element: TypeInt { Bits: 8 } } },
 	}
+	protocol.Messages[0x0004] = Message {
+		Name: "Integers",
+		Type: TypeTableDefined {
+			Fields: map[uint16] Field {
+				0x0000: Field { Name: "U5",  Type: TypeInt { Bits: 5  } },
+				0x0001: Field { Name: "U8",  Type: TypeInt { Bits: 8  } },
+				0x0002: Field { Name: "U16", Type: TypeInt { Bits: 16 } },
+				0x0003: Field { Name: "U32", Type: TypeInt { Bits: 32 } },
+				0x0004: Field { Name: "U64", Type: TypeInt { Bits: 64 } },
+				0x0006: Field { Name: "I8",  Type: TypeInt { Bits: 8,  Signed: true } },
+				0x0007: Field { Name: "I16", Type: TypeInt { Bits: 16, Signed: true } },
+				0x0008: Field { Name: "I32", Type: TypeInt { Bits: 32, Signed: true } },
+				0x0009: Field { Name: "I64", Type: TypeInt { Bits: 64, Signed: true } },
+				0x000B: Field { Name: "NI8", Type: TypeInt { Bits: 8,  Signed: true } },
+				0x000C: Field { Name: "NI16",Type: TypeInt { Bits: 16, Signed: true } },
+				0x000D: Field { Name: "NI32",Type: TypeInt { Bits: 32, Signed: true } },
+				0x000E: Field { Name: "NI64",Type: TypeInt { Bits: 64, Signed: true } },
+			},
+		},
+	}
 	protocol.Types["User"] = TypeTableDefined {
 		Fields: map[uint16] Field {
 			0x0000: Field { Name: "Name",      Type: TypeString { } },