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encoders and decoders for string, []uint8

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R=rsc
DELTA=165  (145 added, 6 deleted, 14 changed)
OCL=31051
CL=31056
This commit is contained in:
Rob Pike 2009-07-02 11:21:01 -07:00
parent 519a70da54
commit 1ca1e1befa
3 changed files with 158 additions and 19 deletions
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44
src/pkg/gob/encode.go
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@ -218,6 +218,26 @@ func encFloat64(i *encInstr, state *EncState, p unsafe.Pointer) {
}
}
// Byte arrays are encoded as an unsigned count followed by the raw bytes.
func encUint8Array(i *encInstr, state *EncState, p unsafe.Pointer) {
b := *(*[]byte)(p);
if len(b) > 0 {
EncodeUint(state, uint64(i.field - state.fieldnum));
EncodeUint(state, uint64(len(b)));
state.w.Write(b);
}
}
// Strings are encoded as an unsigned count followed by the raw bytes.
func encString(i *encInstr, state *EncState, p unsafe.Pointer) {
s := *(*string)(p);
if len(s) > 0 {
EncodeUint(state, uint64(i.field - state.fieldnum));
EncodeUint(state, uint64(len(s)));
io.WriteString(state.w, s);
}
}
// The end of a struct is marked by a delta field number of 0.
func encStructTerminator(i *encInstr, state *EncState, p unsafe.Pointer) {
EncodeUint(state, 0);
@ -247,6 +267,25 @@ var encOpMap = map[int] encOp {
reflect.FloatKind: encFloat,
reflect.Float32Kind: encFloat32,
reflect.Float64Kind: encFloat64,
reflect.StringKind: encString,
}
func encOpFor(typ reflect.Type) encOp {
op, ok := encOpMap[typ.Kind()];
if !ok {
// Special cases
if typ.Kind() == reflect.ArrayKind {
atyp := typ.(reflect.ArrayType);
switch atyp.Elem().Kind() {
case reflect.Uint8Kind:
op = encUint8Array
}
}
}
if op == nil {
panicln("encode can't handle type", typ.String());
}
return op
}
// The local Type was compiled from the actual value, so we know
@ -271,10 +310,7 @@ func compileEnc(rt reflect.Type, typ Type) *encEngine {
ftyp = pt.Sub();
indir++;
}
op, ok := encOpMap[ftyp.Kind()];
if !ok {
panicln("encode can't handle type", ftyp.String());
}
op := encOpFor(ftyp);
engine.instr[fieldnum] = encInstr{op, fieldnum, indir, uintptr(offset)};
}
engine.instr[srt.Len()] = encInstr{encStructTerminator, 0, 0, 0};