Mercurial > gemma

annotate pkg/misc/encode.go @ 1065:cdee23f3ee4c crossprofile

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closed branch crossprofile
author Thomas Junk <thomas.junk@intevation.de>
date Fri, 26 Oct 2018 08:51:56 +0200
parents a244b18cb916
children 5b9b8eabcd01
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package misc
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15
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16 import (
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17 "encoding/binary"
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18 "io"
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19 )
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20
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21 type BinReader struct {
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22 io.Reader
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23 Err error
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24 }
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25
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26 func (r *BinReader) Read(buf []byte) (int, error) {
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27 if r.Err != nil {
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28 return 0, r.Err
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29 }
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30 var n int
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31 n, r.Err = r.Read(buf)
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32 return n, r.Err
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33 }
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34
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35 func (r *BinReader) ReadBin(x interface{}) {
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36 if r.Err == nil {
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37 r.Err = binary.Read(r.Reader, binary.BigEndian, x)
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38 }
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39 }
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40
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41 func (r *BinReader) ReadString(s *string) {
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42 if r.Err != nil {
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43 return
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44 }
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45 var l uint32
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46 if r.Err = binary.Read(r.Reader, binary.BigEndian, &l); r.Err != nil {
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47 return
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48 }
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49 b := make([]byte, l)
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50 if r.Err = binary.Read(r.Reader, binary.BigEndian, b); r.Err != nil {
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51 return
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52 }
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53 *s = string(b)
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54 }
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55
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56 type BinWriter struct {
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57 io.Writer
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58 Err error
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59 }
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60
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61 func (w *BinWriter) Write(buf []byte) (int, error) {
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62 if w.Err != nil {
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63 return 0, w.Err
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64 }
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65 var n int
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66 n, w.Err = w.Writer.Write(buf)
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67 return n, w.Err
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68 }
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69
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70 func (w *BinWriter) WriteBin(x interface{}) {
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71 if w.Err == nil {
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72 w.Err = binary.Write(w.Writer, binary.BigEndian, x)
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73 }
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74 }
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75
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76 func (w *BinWriter) WriteString(s string) {
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77 if w.Err == nil {
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78 w.Err = binary.Write(w.Writer, binary.BigEndian, uint32(len(s)))
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79 }
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80 if w.Err == nil {
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81 w.Err = binary.Write(w.Writer, binary.BigEndian, []byte(s))
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82 }
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83 }