94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
/*
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* Copyright (c) 2018 Jeffrey Walter <jeffreydwalter@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
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* documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package arlo
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import (
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"fmt"
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"io"
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"math"
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"math/rand"
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"net/http"
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"strconv"
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"strings"
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"time"
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)
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func FloatToHex(x float64) string {
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var result []byte
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quotient := int(x)
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fraction := x - float64(quotient)
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for quotient > 0 {
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quotient = int(x / 16)
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remainder := int(x - (float64(quotient) * 16))
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if remainder > 9 {
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result = append([]byte{byte(remainder + 55)}, result...)
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} else {
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for _, c := range strconv.Itoa(int(remainder)) {
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result = append([]byte{byte(c)}, result...)
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}
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}
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x = float64(quotient)
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}
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if fraction == 0 {
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return string(result)
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}
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result = append(result, '.')
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for fraction > 0 {
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fraction = fraction * 16
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integer := int(fraction)
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fraction = fraction - float64(integer)
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if integer > 9 {
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result = append(result, byte(integer+55))
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} else {
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for _, c := range strconv.Itoa(int(integer)) {
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result = append(result, byte(c))
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}
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}
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}
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return string(result)
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}
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func genTransId() string {
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random := rand.New(rand.NewSource(time.Now().UnixNano()))
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e := random.Float64() * math.Pow(2, 32)
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ms := time.Now().UnixNano() / (int64(time.Millisecond) / int64(time.Nanosecond))
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return fmt.Sprintf("%s!%s!%s", TransIdPrefix, strings.ToLower(FloatToHex(e)), strconv.Itoa(int(ms)))
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}
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func (a *Arlo) DownloadFile(url string, w io.Writer) error {
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resp, err := http.Get(url)
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if err != nil {
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return fmt.Errorf("getting %s: %v", url, err)
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}
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defer resp.Body.Close()
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_, err = io.Copy(w, resp.Body)
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if err != nil {
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return fmt.Errorf("copying body to writer: %v", err)
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}
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return nil
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}
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