1 files changed, 157 insertions, 0 deletions
diff --git a/vendor/github.com/chenzhuoyu/base64x/base64x.go b/vendor/github.com/chenzhuoyu/base64x/base64x.go
new file mode 100644
index 000000000..3d457176b
--- /dev/null
+++ b/vendor/github.com/chenzhuoyu/base64x/base64x.go
@@ -0,0 +1,157 @@
+package base64x
+
+import (
+    `encoding/base64`
+)
+
+// An Encoding is a radix 64 encoding/decoding scheme, defined by a
+// 64-character alphabet. The most common encoding is the "base64"
+// encoding defined in RFC 4648 and used in MIME (RFC 2045) and PEM
+// (RFC 1421).  RFC 4648 also defines an alternate encoding, which is
+// the standard encoding with - and _ substituted for + and /.
+type Encoding int
+
+const (
+    _MODE_URL  = 1 << 0
+    _MODE_RAW  = 1 << 1
+    _MODE_AVX2 = 1 << 2
+    _MODE_JSON = 1 << 3
+)
+
+// StdEncoding is the standard base64 encoding, as defined in
+// RFC 4648.
+const StdEncoding Encoding = 0
+
+// URLEncoding is the alternate base64 encoding defined in RFC 4648.
+// It is typically used in URLs and file names.
+const URLEncoding Encoding = _MODE_URL
+
+// RawStdEncoding is the standard raw, unpadded base64 encoding,
+// as defined in RFC 4648 section 3.2.
+//
+// This is the same as StdEncoding but omits padding characters.
+const RawStdEncoding Encoding = _MODE_RAW
+
+// RawURLEncoding is the unpadded alternate base64 encoding defined in RFC 4648.
+// It is typically used in URLs and file names.
+//
+// This is the same as URLEncoding but omits padding characters.
+const RawURLEncoding Encoding = _MODE_RAW | _MODE_URL
+
+// JSONStdEncoding is the StdEncoding and encoded as JSON string as RFC 8259.
+const JSONStdEncoding Encoding = _MODE_JSON;
+
+var (
+    archFlags = 0
+)
+
+/** Encoder Functions **/
+
+// Encode encodes src using the specified encoding, writing
+// EncodedLen(len(src)) bytes to out.
+//
+// The encoding pads the output to a multiple of 4 bytes,
+// so Encode is not appropriate for use on individual blocks
+// of a large data stream.
+//
+// If out is not large enough to contain the encoded result,
+// it will panic.
+func (self Encoding) Encode(out []byte, src []byte) {
+    if len(src) != 0 {
+        if buf := out[:0:len(out)]; self.EncodedLen(len(src)) <= len(out) {
+            self.EncodeUnsafe(&buf, src)
+        } else {
+            panic("encoder output buffer is too small")
+        }
+    }
+}
+
+// EncodeUnsafe behaves like Encode, except it does NOT check if
+// out is large enough to contain the encoded result.
+//
+// It will also update the length of out.
+func (self Encoding) EncodeUnsafe(out *[]byte, src []byte) {
+    __b64encode(out, &src, int(self) | archFlags)
+}
+
+// EncodeToString returns the base64 encoding of src.
+func (self Encoding) EncodeToString(src []byte) string {
+    nbs := len(src)
+    ret := make([]byte, 0, self.EncodedLen(nbs))
+
+    /* encode in native code */
+    self.EncodeUnsafe(&ret, src)
+    return mem2str(ret)
+}
+
+// EncodedLen returns the length in bytes of the base64 encoding
+// of an input buffer of length n.
+func (self Encoding) EncodedLen(n int) int {
+    if (self & _MODE_RAW) == 0 {
+        return (n + 2) / 3 * 4
+    } else {
+        return (n * 8 + 5) / 6
+    }
+}
+
+/** Decoder Functions **/
+
+// Decode decodes src using the encoding enc. It writes at most
+// DecodedLen(len(src)) bytes to out and returns the number of bytes
+// written. If src contains invalid base64 data, it will return the
+// number of bytes successfully written and base64.CorruptInputError.
+//
+// New line characters (\r and \n) are ignored.
+//
+// If out is not large enough to contain the encoded result,
+// it will panic.
+func (self Encoding) Decode(out []byte, src []byte) (int, error) {
+    if len(src) == 0 {
+        return 0, nil
+    } else if buf := out[:0:len(out)]; self.DecodedLen(len(src)) <= len(out) {
+        return self.DecodeUnsafe(&buf, src)
+    } else {
+        panic("decoder output buffer is too small")
+    }
+}
+
+// DecodeUnsafe behaves like Decode, except it does NOT check if
+// out is large enough to contain the decoded result.
+//
+// It will also update the length of out.
+func (self Encoding) DecodeUnsafe(out *[]byte, src []byte) (int, error) {
+    if n := __b64decode(out, mem2addr(src), len(src), int(self) | archFlags); n >= 0 {
+        return n, nil
+    } else {
+        return 0, base64.CorruptInputError(-n - 1)
+    }
+}
+
+// DecodeString returns the bytes represented by the base64 string s.
+func (self Encoding) DecodeString(s string) ([]byte, error) {
+    src := str2mem(s)
+    ret := make([]byte, 0, self.DecodedLen(len(s)))
+
+    /* decode into the allocated buffer */
+    if _, err := self.DecodeUnsafe(&ret, src); err != nil {
+        return nil, err
+    } else {
+        return ret, nil
+    }
+}
+
+// DecodedLen returns the maximum length in bytes of the decoded data
+// corresponding to n bytes of base64-encoded data.
+func (self Encoding) DecodedLen(n int) int {
+    if (self & _MODE_RAW) == 0 {
+        return n / 4 * 3
+    } else {
+        return n * 6 / 8
+    }
+}
+
+func init() {
+    if hasAVX2() {
+        archFlags = _MODE_AVX2
+    }
+}