utility.go

package jpegstructure

import (
	"bytes"
	"fmt"
	"sort"
	"strings"

	"github.com/dsoprea/go-logging"
	"github.com/go-xmlfmt/xmlfmt"
)

// DumpBytes prints the hex for a given byte-slice.
func DumpBytes(data []byte) {
	fmt.Printf("DUMP: ")
	for _, x := range data {
		fmt.Printf("%02x ", x)
	}

	fmt.Printf("\n")
}

// DumpBytesClause prints a Go-formatted byte-slice expression.
func DumpBytesClause(data []byte) {
	fmt.Printf("DUMP: ")

	fmt.Printf("[]byte { ")

	for i, x := range data {
		fmt.Printf("0x%02x", x)

		if i < len(data)-1 {
			fmt.Printf(", ")
		}
	}

	fmt.Printf(" }\n")
}

// DumpBytesToString returns a string of hex-encoded bytes.
func DumpBytesToString(data []byte) string {
	b := new(bytes.Buffer)

	for i, x := range data {
		_, err := b.WriteString(fmt.Sprintf("%02x", x))
		log.PanicIf(err)

		if i < len(data)-1 {
			_, err := b.WriteRune(' ')
			log.PanicIf(err)
		}
	}

	return b.String()
}

// DumpBytesClauseToString returns a string of Go-formatted byte values.
func DumpBytesClauseToString(data []byte) string {
	b := new(bytes.Buffer)

	for i, x := range data {
		_, err := b.WriteString(fmt.Sprintf("0x%02x", x))
		log.PanicIf(err)

		if i < len(data)-1 {
			_, err := b.WriteString(", ")
			log.PanicIf(err)
		}
	}

	return b.String()
}

// FormatXml prettifies XML data.
func FormatXml(raw string) (formatted string, err error) {
	defer func() {
		if state := recover(); state != nil {
			err = log.Wrap(state.(error))
		}
	}()

	formatted = xmlfmt.FormatXML(raw, "  ", "  ")
	formatted = strings.TrimSpace(formatted)

	return formatted, nil
}

// SortStringStringMap sorts a string-string dictionary and returns it as a list
// of 2-tuples.
func SortStringStringMap(data map[string]string) (sorted [][2]string) {
	// Sort keys.

	sortedKeys := make([]string, len(data))
	i := 0
	for key := range data {
		sortedKeys[i] = key
		i++
	}

	sort.Strings(sortedKeys)

	// Build result.

	sorted = make([][2]string, len(sortedKeys))
	for i, key := range sortedKeys {
		sorted[i] = [2]string{key, data[key]}
	}

	return sorted
}