diff options
Diffstat (limited to 'gcc-4.8.1/libgo/go/encoding/asn1/marshal.go')
| -rw-r--r-- | gcc-4.8.1/libgo/go/encoding/asn1/marshal.go | 582 |
1 files changed, 0 insertions, 582 deletions
diff --git a/gcc-4.8.1/libgo/go/encoding/asn1/marshal.go b/gcc-4.8.1/libgo/go/encoding/asn1/marshal.go deleted file mode 100644 index 0c216fdb3..000000000 --- a/gcc-4.8.1/libgo/go/encoding/asn1/marshal.go +++ /dev/null @@ -1,582 +0,0 @@ -// Copyright 2009 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package asn1 - -import ( - "bytes" - "errors" - "fmt" - "io" - "math/big" - "reflect" - "time" - "unicode/utf8" -) - -// A forkableWriter is an in-memory buffer that can be -// 'forked' to create new forkableWriters that bracket the -// original. After -// pre, post := w.fork(); -// the overall sequence of bytes represented is logically w+pre+post. -type forkableWriter struct { - *bytes.Buffer - pre, post *forkableWriter -} - -func newForkableWriter() *forkableWriter { - return &forkableWriter{new(bytes.Buffer), nil, nil} -} - -func (f *forkableWriter) fork() (pre, post *forkableWriter) { - if f.pre != nil || f.post != nil { - panic("have already forked") - } - f.pre = newForkableWriter() - f.post = newForkableWriter() - return f.pre, f.post -} - -func (f *forkableWriter) Len() (l int) { - l += f.Buffer.Len() - if f.pre != nil { - l += f.pre.Len() - } - if f.post != nil { - l += f.post.Len() - } - return -} - -func (f *forkableWriter) writeTo(out io.Writer) (n int, err error) { - n, err = out.Write(f.Bytes()) - if err != nil { - return - } - - var nn int - - if f.pre != nil { - nn, err = f.pre.writeTo(out) - n += nn - if err != nil { - return - } - } - - if f.post != nil { - nn, err = f.post.writeTo(out) - n += nn - } - return -} - -func marshalBase128Int(out *forkableWriter, n int64) (err error) { - if n == 0 { - err = out.WriteByte(0) - return - } - - l := 0 - for i := n; i > 0; i >>= 7 { - l++ - } - - for i := l - 1; i >= 0; i-- { - o := byte(n >> uint(i*7)) - o &= 0x7f - if i != 0 { - o |= 0x80 - } - err = out.WriteByte(o) - if err != nil { - return - } - } - - return nil -} - -func marshalInt64(out *forkableWriter, i int64) (err error) { - n := int64Length(i) - - for ; n > 0; n-- { - err = out.WriteByte(byte(i >> uint((n-1)*8))) - if err != nil { - return - } - } - - return nil -} - -func int64Length(i int64) (numBytes int) { - numBytes = 1 - - for i > 127 { - numBytes++ - i >>= 8 - } - - for i < -128 { - numBytes++ - i >>= 8 - } - - return -} - -func marshalBigInt(out *forkableWriter, n *big.Int) (err error) { - if n.Sign() < 0 { - // A negative number has to be converted to two's-complement - // form. So we'll subtract 1 and invert. If the - // most-significant-bit isn't set then we'll need to pad the - // beginning with 0xff in order to keep the number negative. - nMinus1 := new(big.Int).Neg(n) - nMinus1.Sub(nMinus1, bigOne) - bytes := nMinus1.Bytes() - for i := range bytes { - bytes[i] ^= 0xff - } - if len(bytes) == 0 || bytes[0]&0x80 == 0 { - err = out.WriteByte(0xff) - if err != nil { - return - } - } - _, err = out.Write(bytes) - } else if n.Sign() == 0 { - // Zero is written as a single 0 zero rather than no bytes. - err = out.WriteByte(0x00) - } else { - bytes := n.Bytes() - if len(bytes) > 0 && bytes[0]&0x80 != 0 { - // We'll have to pad this with 0x00 in order to stop it - // looking like a negative number. - err = out.WriteByte(0) - if err != nil { - return - } - } - _, err = out.Write(bytes) - } - return -} - -func marshalLength(out *forkableWriter, i int) (err error) { - n := lengthLength(i) - - for ; n > 0; n-- { - err = out.WriteByte(byte(i >> uint((n-1)*8))) - if err != nil { - return - } - } - - return nil -} - -func lengthLength(i int) (numBytes int) { - numBytes = 1 - for i > 255 { - numBytes++ - i >>= 8 - } - return -} - -func marshalTagAndLength(out *forkableWriter, t tagAndLength) (err error) { - b := uint8(t.class) << 6 - if t.isCompound { - b |= 0x20 - } - if t.tag >= 31 { - b |= 0x1f - err = out.WriteByte(b) - if err != nil { - return - } - err = marshalBase128Int(out, int64(t.tag)) - if err != nil { - return - } - } else { - b |= uint8(t.tag) - err = out.WriteByte(b) - if err != nil { - return - } - } - - if t.length >= 128 { - l := lengthLength(t.length) - err = out.WriteByte(0x80 | byte(l)) - if err != nil { - return - } - err = marshalLength(out, t.length) - if err != nil { - return - } - } else { - err = out.WriteByte(byte(t.length)) - if err != nil { - return - } - } - - return nil -} - -func marshalBitString(out *forkableWriter, b BitString) (err error) { - paddingBits := byte((8 - b.BitLength%8) % 8) - err = out.WriteByte(paddingBits) - if err != nil { - return - } - _, err = out.Write(b.Bytes) - return -} - -func marshalObjectIdentifier(out *forkableWriter, oid []int) (err error) { - if len(oid) < 2 || oid[0] > 6 || oid[1] >= 40 { - return StructuralError{"invalid object identifier"} - } - - err = out.WriteByte(byte(oid[0]*40 + oid[1])) - if err != nil { - return - } - for i := 2; i < len(oid); i++ { - err = marshalBase128Int(out, int64(oid[i])) - if err != nil { - return - } - } - - return -} - -func marshalPrintableString(out *forkableWriter, s string) (err error) { - b := []byte(s) - for _, c := range b { - if !isPrintable(c) { - return StructuralError{"PrintableString contains invalid character"} - } - } - - _, err = out.Write(b) - return -} - -func marshalIA5String(out *forkableWriter, s string) (err error) { - b := []byte(s) - for _, c := range b { - if c > 127 { - return StructuralError{"IA5String contains invalid character"} - } - } - - _, err = out.Write(b) - return -} - -func marshalUTF8String(out *forkableWriter, s string) (err error) { - _, err = out.Write([]byte(s)) - return -} - -func marshalTwoDigits(out *forkableWriter, v int) (err error) { - err = out.WriteByte(byte('0' + (v/10)%10)) - if err != nil { - return - } - return out.WriteByte(byte('0' + v%10)) -} - -func marshalUTCTime(out *forkableWriter, t time.Time) (err error) { - year, month, day := t.Date() - - switch { - case 1950 <= year && year < 2000: - err = marshalTwoDigits(out, int(year-1900)) - case 2000 <= year && year < 2050: - err = marshalTwoDigits(out, int(year-2000)) - default: - return StructuralError{"Cannot represent time as UTCTime"} - } - if err != nil { - return - } - - err = marshalTwoDigits(out, int(month)) - if err != nil { - return - } - - err = marshalTwoDigits(out, day) - if err != nil { - return - } - - hour, min, sec := t.Clock() - - err = marshalTwoDigits(out, hour) - if err != nil { - return - } - - err = marshalTwoDigits(out, min) - if err != nil { - return - } - - err = marshalTwoDigits(out, sec) - if err != nil { - return - } - - _, offset := t.Zone() - - switch { - case offset/60 == 0: - err = out.WriteByte('Z') - return - case offset > 0: - err = out.WriteByte('+') - case offset < 0: - err = out.WriteByte('-') - } - - if err != nil { - return - } - - offsetMinutes := offset / 60 - if offsetMinutes < 0 { - offsetMinutes = -offsetMinutes - } - - err = marshalTwoDigits(out, offsetMinutes/60) - if err != nil { - return - } - - err = marshalTwoDigits(out, offsetMinutes%60) - return -} - -func stripTagAndLength(in []byte) []byte { - _, offset, err := parseTagAndLength(in, 0) - if err != nil { - return in - } - return in[offset:] -} - -func marshalBody(out *forkableWriter, value reflect.Value, params fieldParameters) (err error) { - switch value.Type() { - case timeType: - return marshalUTCTime(out, value.Interface().(time.Time)) - case bitStringType: - return marshalBitString(out, value.Interface().(BitString)) - case objectIdentifierType: - return marshalObjectIdentifier(out, value.Interface().(ObjectIdentifier)) - case bigIntType: - return marshalBigInt(out, value.Interface().(*big.Int)) - } - - switch v := value; v.Kind() { - case reflect.Bool: - if v.Bool() { - return out.WriteByte(255) - } else { - return out.WriteByte(0) - } - case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: - return marshalInt64(out, int64(v.Int())) - case reflect.Struct: - t := v.Type() - - startingField := 0 - - // If the first element of the structure is a non-empty - // RawContents, then we don't bother serializing the rest. - if t.NumField() > 0 && t.Field(0).Type == rawContentsType { - s := v.Field(0) - if s.Len() > 0 { - bytes := make([]byte, s.Len()) - for i := 0; i < s.Len(); i++ { - bytes[i] = uint8(s.Index(i).Uint()) - } - /* The RawContents will contain the tag and - * length fields but we'll also be writing - * those ourselves, so we strip them out of - * bytes */ - _, err = out.Write(stripTagAndLength(bytes)) - return - } else { - startingField = 1 - } - } - - for i := startingField; i < t.NumField(); i++ { - var pre *forkableWriter - pre, out = out.fork() - err = marshalField(pre, v.Field(i), parseFieldParameters(t.Field(i).Tag.Get("asn1"))) - if err != nil { - return - } - } - return - case reflect.Slice: - sliceType := v.Type() - if sliceType.Elem().Kind() == reflect.Uint8 { - bytes := make([]byte, v.Len()) - for i := 0; i < v.Len(); i++ { - bytes[i] = uint8(v.Index(i).Uint()) - } - _, err = out.Write(bytes) - return - } - - var params fieldParameters - for i := 0; i < v.Len(); i++ { - var pre *forkableWriter - pre, out = out.fork() - err = marshalField(pre, v.Index(i), params) - if err != nil { - return - } - } - return - case reflect.String: - switch params.stringType { - case tagIA5String: - return marshalIA5String(out, v.String()) - case tagPrintableString: - return marshalPrintableString(out, v.String()) - default: - return marshalUTF8String(out, v.String()) - } - return - } - - return StructuralError{"unknown Go type"} -} - -func marshalField(out *forkableWriter, v reflect.Value, params fieldParameters) (err error) { - // If the field is an interface{} then recurse into it. - if v.Kind() == reflect.Interface && v.Type().NumMethod() == 0 { - return marshalField(out, v.Elem(), params) - } - - if v.Kind() == reflect.Slice && v.Len() == 0 && params.omitEmpty { - return - } - - if params.optional && reflect.DeepEqual(v.Interface(), reflect.Zero(v.Type()).Interface()) { - return - } - - if v.Type() == rawValueType { - rv := v.Interface().(RawValue) - if len(rv.FullBytes) != 0 { - _, err = out.Write(rv.FullBytes) - } else { - err = marshalTagAndLength(out, tagAndLength{rv.Class, rv.Tag, len(rv.Bytes), rv.IsCompound}) - if err != nil { - return - } - _, err = out.Write(rv.Bytes) - } - return - } - - tag, isCompound, ok := getUniversalType(v.Type()) - if !ok { - err = StructuralError{fmt.Sprintf("unknown Go type: %v", v.Type())} - return - } - class := classUniversal - - if params.stringType != 0 && tag != tagPrintableString { - return StructuralError{"Explicit string type given to non-string member"} - } - - if tag == tagPrintableString { - if params.stringType == 0 { - // This is a string without an explicit string type. We'll use - // a PrintableString if the character set in the string is - // sufficiently limited, otherwise we'll use a UTF8String. - for _, r := range v.String() { - if r >= utf8.RuneSelf || !isPrintable(byte(r)) { - if !utf8.ValidString(v.String()) { - return errors.New("asn1: string not valid UTF-8") - } - tag = tagUTF8String - break - } - } - } else { - tag = params.stringType - } - } - - if params.set { - if tag != tagSequence { - return StructuralError{"Non sequence tagged as set"} - } - tag = tagSet - } - - tags, body := out.fork() - - err = marshalBody(body, v, params) - if err != nil { - return - } - - bodyLen := body.Len() - - var explicitTag *forkableWriter - if params.explicit { - explicitTag, tags = tags.fork() - } - - if !params.explicit && params.tag != nil { - // implicit tag. - tag = *params.tag - class = classContextSpecific - } - - err = marshalTagAndLength(tags, tagAndLength{class, tag, bodyLen, isCompound}) - if err != nil { - return - } - - if params.explicit { - err = marshalTagAndLength(explicitTag, tagAndLength{ - class: classContextSpecific, - tag: *params.tag, - length: bodyLen + tags.Len(), - isCompound: true, - }) - } - - return nil -} - -// Marshal returns the ASN.1 encoding of val. -func Marshal(val interface{}) ([]byte, error) { - var out bytes.Buffer - v := reflect.ValueOf(val) - f := newForkableWriter() - err := marshalField(f, v, fieldParameters{}) - if err != nil { - return nil, err - } - _, err = f.writeTo(&out) - return out.Bytes(), nil -} |