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Diffstat (limited to 'vendor/golang.org/x/crypto/cryptobyte/string.go')
| -rw-r--r-- | vendor/golang.org/x/crypto/cryptobyte/string.go | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/vendor/golang.org/x/crypto/cryptobyte/string.go b/vendor/golang.org/x/crypto/cryptobyte/string.go deleted file mode 100644 index 39bf98a..0000000 --- a/vendor/golang.org/x/crypto/cryptobyte/string.go +++ /dev/null @@ -1,166 +0,0 @@ -// Copyright 2017 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 cryptobyte contains types that help with parsing and constructing -// length-prefixed, binary messages, including ASN.1 DER. (The asn1 subpackage -// contains useful ASN.1 constants.) -// -// The String type is for parsing. It wraps a []byte slice and provides helper -// functions for consuming structures, value by value. -// -// The Builder type is for constructing messages. It providers helper functions -// for appending values and also for appending length-prefixed submessages – -// without having to worry about calculating the length prefix ahead of time. -// -// See the documentation and examples for the Builder and String types to get -// started. -package cryptobyte // import "golang.org/x/crypto/cryptobyte" - -// String represents a string of bytes. It provides methods for parsing -// fixed-length and length-prefixed values from it. -type String []byte - -// read advances a String by n bytes and returns them. If less than n bytes -// remain, it returns nil. -func (s *String) read(n int) []byte { - if len(*s) < n { - return nil - } - v := (*s)[:n] - *s = (*s)[n:] - return v -} - -// Skip advances the String by n byte and reports whether it was successful. -func (s *String) Skip(n int) bool { - return s.read(n) != nil -} - -// ReadUint8 decodes an 8-bit value into out and advances over it. -// It reports whether the read was successful. -func (s *String) ReadUint8(out *uint8) bool { - v := s.read(1) - if v == nil { - return false - } - *out = uint8(v[0]) - return true -} - -// ReadUint16 decodes a big-endian, 16-bit value into out and advances over it. -// It reports whether the read was successful. -func (s *String) ReadUint16(out *uint16) bool { - v := s.read(2) - if v == nil { - return false - } - *out = uint16(v[0])<<8 | uint16(v[1]) - return true -} - -// ReadUint24 decodes a big-endian, 24-bit value into out and advances over it. -// It reports whether the read was successful. -func (s *String) ReadUint24(out *uint32) bool { - v := s.read(3) - if v == nil { - return false - } - *out = uint32(v[0])<<16 | uint32(v[1])<<8 | uint32(v[2]) - return true -} - -// ReadUint32 decodes a big-endian, 32-bit value into out and advances over it. -// It reports whether the read was successful. -func (s *String) ReadUint32(out *uint32) bool { - v := s.read(4) - if v == nil { - return false - } - *out = uint32(v[0])<<24 | uint32(v[1])<<16 | uint32(v[2])<<8 | uint32(v[3]) - return true -} - -func (s *String) readUnsigned(out *uint32, length int) bool { - v := s.read(length) - if v == nil { - return false - } - var result uint32 - for i := 0; i < length; i++ { - result <<= 8 - result |= uint32(v[i]) - } - *out = result - return true -} - -func (s *String) readLengthPrefixed(lenLen int, outChild *String) bool { - lenBytes := s.read(lenLen) - if lenBytes == nil { - return false - } - var length uint32 - for _, b := range lenBytes { - length = length << 8 - length = length | uint32(b) - } - if int(length) < 0 { - // This currently cannot overflow because we read uint24 at most, but check - // anyway in case that changes in the future. - return false - } - v := s.read(int(length)) - if v == nil { - return false - } - *outChild = v - return true -} - -// ReadUint8LengthPrefixed reads the content of an 8-bit length-prefixed value -// into out and advances over it. It reports whether the read was successful. -func (s *String) ReadUint8LengthPrefixed(out *String) bool { - return s.readLengthPrefixed(1, out) -} - -// ReadUint16LengthPrefixed reads the content of a big-endian, 16-bit -// length-prefixed value into out and advances over it. It reports whether the -// read was successful. -func (s *String) ReadUint16LengthPrefixed(out *String) bool { - return s.readLengthPrefixed(2, out) -} - -// ReadUint24LengthPrefixed reads the content of a big-endian, 24-bit -// length-prefixed value into out and advances over it. It reports whether -// the read was successful. -func (s *String) ReadUint24LengthPrefixed(out *String) bool { - return s.readLengthPrefixed(3, out) -} - -// ReadBytes reads n bytes into out and advances over them. It reports -// whether the read was successful. -func (s *String) ReadBytes(out *[]byte, n int) bool { - v := s.read(n) - if v == nil { - return false - } - *out = v - return true -} - -// CopyBytes copies len(out) bytes into out and advances over them. It reports -// whether the copy operation was successful -func (s *String) CopyBytes(out []byte) bool { - n := len(out) - v := s.read(n) - if v == nil { - return false - } - return copy(out, v) == n -} - -// Empty reports whether the string does not contain any bytes. -func (s String) Empty() bool { - return len(s) == 0 -} |