diff options
Diffstat (limited to 'vendor/github.com/golang/geo/s2/encode.go')
| -rw-r--r-- | vendor/github.com/golang/geo/s2/encode.go | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/vendor/github.com/golang/geo/s2/encode.go b/vendor/github.com/golang/geo/s2/encode.go deleted file mode 100644 index 00d0adc71..000000000 --- a/vendor/github.com/golang/geo/s2/encode.go +++ /dev/null @@ -1,224 +0,0 @@ -// Copyright 2017 Google Inc. All rights reserved. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package s2 - -import ( - "encoding/binary" - "io" - "math" -) - -const ( - // encodingVersion is the current version of the encoding - // format that is compatible with C++ and other S2 libraries. - encodingVersion = int8(1) - - // encodingCompressedVersion is the current version of the - // compressed format. - encodingCompressedVersion = int8(4) -) - -// encoder handles the specifics of encoding for S2 types. -type encoder struct { - w io.Writer // the real writer passed to Encode - err error -} - -func (e *encoder) writeUvarint(x uint64) { - if e.err != nil { - return - } - var buf [binary.MaxVarintLen64]byte - n := binary.PutUvarint(buf[:], x) - _, e.err = e.w.Write(buf[:n]) -} - -func (e *encoder) writeBool(x bool) { - if e.err != nil { - return - } - var val int8 - if x { - val = 1 - } - e.err = binary.Write(e.w, binary.LittleEndian, val) -} - -func (e *encoder) writeInt8(x int8) { - if e.err != nil { - return - } - e.err = binary.Write(e.w, binary.LittleEndian, x) -} - -func (e *encoder) writeInt16(x int16) { - if e.err != nil { - return - } - e.err = binary.Write(e.w, binary.LittleEndian, x) -} - -func (e *encoder) writeInt32(x int32) { - if e.err != nil { - return - } - e.err = binary.Write(e.w, binary.LittleEndian, x) -} - -func (e *encoder) writeInt64(x int64) { - if e.err != nil { - return - } - e.err = binary.Write(e.w, binary.LittleEndian, x) -} - -func (e *encoder) writeUint8(x uint8) { - if e.err != nil { - return - } - _, e.err = e.w.Write([]byte{x}) -} - -func (e *encoder) writeUint32(x uint32) { - if e.err != nil { - return - } - e.err = binary.Write(e.w, binary.LittleEndian, x) -} - -func (e *encoder) writeUint64(x uint64) { - if e.err != nil { - return - } - e.err = binary.Write(e.w, binary.LittleEndian, x) -} - -func (e *encoder) writeFloat32(x float32) { - if e.err != nil { - return - } - e.err = binary.Write(e.w, binary.LittleEndian, x) -} - -func (e *encoder) writeFloat64(x float64) { - if e.err != nil { - return - } - e.err = binary.Write(e.w, binary.LittleEndian, x) -} - -type byteReader interface { - io.Reader - io.ByteReader -} - -// byteReaderAdapter embellishes an io.Reader with a ReadByte method, -// so that it implements the io.ByteReader interface. -type byteReaderAdapter struct { - io.Reader -} - -func (b byteReaderAdapter) ReadByte() (byte, error) { - buf := []byte{0} - _, err := io.ReadFull(b, buf) - return buf[0], err -} - -func asByteReader(r io.Reader) byteReader { - if br, ok := r.(byteReader); ok { - return br - } - return byteReaderAdapter{r} -} - -type decoder struct { - r byteReader // the real reader passed to Decode - err error - buf []byte -} - -// Get a buffer of size 8, to avoid allocating over and over. -func (d *decoder) buffer() []byte { - if d.buf == nil { - d.buf = make([]byte, 8) - } - return d.buf -} - -func (d *decoder) readBool() (x bool) { - if d.err != nil { - return - } - var val int8 - d.err = binary.Read(d.r, binary.LittleEndian, &val) - return val == 1 -} - -func (d *decoder) readInt8() (x int8) { - if d.err != nil { - return - } - d.err = binary.Read(d.r, binary.LittleEndian, &x) - return -} - -func (d *decoder) readInt64() (x int64) { - if d.err != nil { - return - } - d.err = binary.Read(d.r, binary.LittleEndian, &x) - return -} - -func (d *decoder) readUint8() (x uint8) { - if d.err != nil { - return - } - x, d.err = d.r.ReadByte() - return -} - -func (d *decoder) readUint32() (x uint32) { - if d.err != nil { - return - } - d.err = binary.Read(d.r, binary.LittleEndian, &x) - return -} - -func (d *decoder) readUint64() (x uint64) { - if d.err != nil { - return - } - d.err = binary.Read(d.r, binary.LittleEndian, &x) - return -} - -func (d *decoder) readFloat64() float64 { - if d.err != nil { - return 0 - } - buf := d.buffer() - _, d.err = io.ReadFull(d.r, buf) - return math.Float64frombits(binary.LittleEndian.Uint64(buf)) -} - -func (d *decoder) readUvarint() (x uint64) { - if d.err != nil { - return - } - x, d.err = binary.ReadUvarint(d.r) - return -} |