Initial commit

.gitignore

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+cli/imei/imei

LICENSE

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+MIT License
+
+Copyright (c) 2020 Ali Yousuf
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

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+.PHONY: build
+build: test imei
+
+.PHONY: test
+test: *.go
+	go test ./...
+
+.PHONY: clean
+clean:
+	rm imei
+
+imei: *.go cli/imei/*.go
+	go build ./cli/imei/...

README.md

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+# IMEI converter
+This tool takes an IMEI in one format and outputs in another.
+
+## Supported IMEI formats
+- 18 digit decimal
+- 14 digit hexadecimal
+- 15 digit hexadecimal with checksum
+
+## Build
+```sh
+$ make build
+$ ./imei -h
+Usage of ./imei:
+  -input path
+        input path (use - for stdin) (default "-")
+  -input-format format
+        input imei format [auto, hex-checksum, hex, dec] (default "auto")
+  -output-format format
+        output imei format [hex-checksum, hex, dec] (default "hex-checksum")
+```

checksum.go

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+package imei
+
+import (
+	"strconv"
+	"strings"
+)
+
+func ChecksumFromString(str string) int {
+	sum := 0
+	for i, ch := range strings.Split(str, "") {
+		n, _ := strconv.Atoi(ch)
+
+		if (i % 2) == 1 {
+			n = n * 2
+		}
+
+		if n >= 10 {
+			n = (n % 10) + 1
+		}
+
+		sum = sum + n
+	}
+
+	return (10 - (sum % 10)) % 10
+}

checksum_test.go

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+package imei_test
+
+import (
+	"testing"
+
+	"github.com/alyyousuf7/imei-go"
+)
+
+func TestGenerateChecksum(t *testing.T) {
+	testcases := []struct {
+		str      string
+		checksum int
+	}{
+		{"00000000000000", 0},
+		{"35464110052131", 2},
+		{"35611709842290", 2},
+		{"35862909296647", 6},
+		{"35671608638324", 8},
+	}
+
+	for _, testcase := range testcases {
+		checksum := imei.ChecksumFromString(testcase.str)
+		if checksum != testcase.checksum {
+			t.Errorf("Expected checksum %d for %s, but got %d", testcase.checksum, testcase.str, checksum)
+		}
+	}
+}

cli/imei/main.go

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+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/alyyousuf7/imei-go"
+)
+
+func main() {
+	// Flags
+	allowedInputFormats := []string{"auto", "hex-checksum", "hex", "dec"}
+	allowedOutputFormats := []string{"hex-checksum", "hex", "dec"}
+
+	var inputFormat string
+	flag.StringVar(&inputFormat, "input-format", allowedInputFormats[0], fmt.Sprintf("input imei `format` [%s]", strings.Join(allowedInputFormats, ", ")))
+
+	var outputFormat string
+	flag.StringVar(&outputFormat, "output-format", allowedOutputFormats[0], fmt.Sprintf("output imei `format` [%s]", strings.Join(allowedOutputFormats, ", ")))
+
+	var inputFile string
+	flag.StringVar(&inputFile, "input", "-", "input `path` (use - for stdin)")
+
+	flag.Parse()
+
+	var outputIMEIType imei.IMEIType
+	switch outputFormat {
+	case "dec":
+		outputIMEIType = imei.DecimalIMEI
+	case "hex":
+		outputIMEIType = imei.HexadecimalIMEI
+	case "hex-checksum":
+		outputIMEIType = imei.HexadecimalChecksumIMEI
+	default:
+		fmt.Println("Usage:")
+		flag.PrintDefaults()
+		os.Exit(1)
+	}
+
+	// Read
+	var file io.Reader
+
+	if inputFile == "-" {
+		file = os.Stdin
+	} else {
+		file, err := os.Open(inputFile)
+		if err != nil {
+			fmt.Println(err)
+			fmt.Println()
+
+			fmt.Println("Usage:")
+			flag.PrintDefaults()
+			os.Exit(1)
+		}
+		defer file.Close()
+	}
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		text := scanner.Text()
+
+		var parsedIMEI *imei.IMEI
+		var err error
+
+		switch inputFormat {
+		case "auto":
+			parsedIMEI, err = imei.DecimalIMEI.Parse(text)
+			if err != nil {
+				parsedIMEI, err = imei.HexadecimalIMEI.Parse(text)
+				if err != nil {
+					parsedIMEI, err = imei.HexadecimalChecksumIMEI.Parse(text)
+				}
+			}
+		case "dec":
+			parsedIMEI, err = imei.DecimalIMEI.Parse(text)
+		case "hex":
+			parsedIMEI, err = imei.HexadecimalIMEI.Parse(text)
+		case "hex-checksum":
+			parsedIMEI, err = imei.HexadecimalChecksumIMEI.Parse(text)
+		default:
+			fmt.Println("unknown input format")
+			fmt.Println()
+
+			fmt.Println("Usage:")
+			flag.PrintDefaults()
+			os.Exit(1)
+			break
+		}
+
+		if err != nil {
+			fmt.Println(text, "-", err)
+		} else if parsedIMEI != nil {
+			fmt.Println(parsedIMEI.String(outputIMEIType))
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}

conversion_test.go

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+package imei_test
+
+import (
+	"testing"
+
+	"github.com/alyyousuf7/imei-go"
+)
+
+func TestToDecimalIMEI(t *testing.T) {
+	shouldPassCases := []string{"000000000000000000", "999999999999999999", "012345678901234567"}
+	for _, str := range shouldPassCases {
+		outIMEI, err := imei.DecimalIMEI.Parse(str)
+		if err != nil {
+			t.Errorf("Failed on parse %s: %s", str, err)
+			continue
+		}
+
+		result := outIMEI.String(imei.DecimalIMEI)
+		if result != str {
+			t.Errorf("Expected %s, but got %s", str, result)
+		}
+	}
+}
+
+func TestToHexadecimalIMEI(t *testing.T) {
+	shouldPassCases := []string{"00000000000000", "99999999999999"}
+	for _, str := range shouldPassCases {
+		outIMEI, err := imei.HexadecimalIMEI.Parse(str)
+		if err != nil {
+			t.Errorf("Failed on parse %s: %s", str, err)
+			continue
+		}
+
+		result := outIMEI.String(imei.HexadecimalIMEI)
+		if result != str {
+			t.Errorf("Expected %s, but got %s", str, result)
+		}
+	}
+}
+
+func TestIMEICrossConversion(t *testing.T) {
+	conversionTestCase := []struct {
+		Decimal     string
+		Hexadecimal string
+		Checksum    string
+	}{
+		{"030541989609441844", "12345678901234", "7"},
+		{"089379662400336177", "35464110052131", "2"},
+		{"089555533708659600", "35611709842290", "2"},
+		{"089798477702713159", "35862909296647", "6"},
+		{"089594829606521636", "35671608638324", "8"},
+	}
+
+	for _, testcase := range conversionTestCase {
+		// Decimal to Hexadecimal
+		i, err := imei.DecimalIMEI.Parse(testcase.Decimal)
+		if err != nil {
+			t.Errorf("Failed on parse %s: %s", testcase.Decimal, err)
+			continue
+		}
+
+		hex := i.String(imei.HexadecimalIMEI)
+		if hex != testcase.Hexadecimal {
+			t.Errorf("Expected Hexadecimal %s, but got %s", testcase.Hexadecimal, hex)
+		}
+
+		hex = i.String(imei.HexadecimalChecksumIMEI)
+		if hex != testcase.Hexadecimal+testcase.Checksum {
+			t.Errorf("Expected Hexadecimal with checksum %s, but got %s", testcase.Hexadecimal+testcase.Checksum, hex)
+		}
+
+		// Hexadecimal to Decimal
+		i, err = imei.HexadecimalIMEI.Parse(testcase.Hexadecimal)
+		if err != nil {
+			t.Errorf("Failed on parse %s: %s", testcase.Hexadecimal, err)
+			continue
+		}
+
+		dec := i.String(imei.DecimalIMEI)
+		if dec != testcase.Decimal {
+			t.Errorf("Expected Decimal %s, but got %s", testcase.Decimal, dec)
+		}
+
+		// Hexadecimal (Checksum) to Decimal
+		i, err = imei.HexadecimalChecksumIMEI.Parse(testcase.Hexadecimal + testcase.Checksum)
+		if err != nil {
+			t.Errorf("Failed on parse %s: %s", testcase.Hexadecimal+testcase.Checksum, err)
+			continue
+		}
+
+		dec = i.String(imei.DecimalIMEI)
+		if dec != testcase.Decimal {
+			t.Errorf("Expected Decimal %s, but got %s", testcase.Decimal, dec)
+		}
+	}
+}

go.mod

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+module github.com/alyyousuf7/imei-go
+
+go 1.15