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package exifcommon
import (
"bytes"
"fmt"
"reflect"
"strconv"
"strings"
"time"
"github.com/dsoprea/go-logging"
)
var (
timeType = reflect.TypeOf(time.Time{})
)
// DumpBytes prints a list of hex-encoded bytes.
func DumpBytes(data []byte) {
fmt.Printf("DUMP: ")
for _, x := range data {
fmt.Printf("%02x ", x)
}
fmt.Printf("\n")
}
// DumpBytesClause prints a list like DumpBytes(), but encapsulated in
// "[]byte { ... }".
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 stringified list 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 comma-separated list of hex-encoded bytes.
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()
}
// ExifFullTimestampString produces a string like "2018:11:30 13:01:49" from a
// `time.Time` struct. It will attempt to convert to UTC first.
func ExifFullTimestampString(t time.Time) (fullTimestampPhrase string) {
t = t.UTC()
return fmt.Sprintf("%04d:%02d:%02d %02d:%02d:%02d", t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second())
}
// ParseExifFullTimestamp parses dates like "2018:11:30 13:01:49" into a UTC
// `time.Time` struct.
func ParseExifFullTimestamp(fullTimestampPhrase string) (timestamp time.Time, err error) {
defer func() {
if state := recover(); state != nil {
err = log.Wrap(state.(error))
}
}()
parts := strings.Split(fullTimestampPhrase, " ")
datestampValue, timestampValue := parts[0], parts[1]
// Normalize the separators.
datestampValue = strings.ReplaceAll(datestampValue, "-", ":")
timestampValue = strings.ReplaceAll(timestampValue, "-", ":")
dateParts := strings.Split(datestampValue, ":")
year, err := strconv.ParseUint(dateParts[0], 10, 16)
if err != nil {
log.Panicf("could not parse year")
}
month, err := strconv.ParseUint(dateParts[1], 10, 8)
if err != nil {
log.Panicf("could not parse month")
}
day, err := strconv.ParseUint(dateParts[2], 10, 8)
if err != nil {
log.Panicf("could not parse day")
}
timeParts := strings.Split(timestampValue, ":")
hour, err := strconv.ParseUint(timeParts[0], 10, 8)
if err != nil {
log.Panicf("could not parse hour")
}
minute, err := strconv.ParseUint(timeParts[1], 10, 8)
if err != nil {
log.Panicf("could not parse minute")
}
second, err := strconv.ParseUint(timeParts[2], 10, 8)
if err != nil {
log.Panicf("could not parse second")
}
timestamp = time.Date(int(year), time.Month(month), int(day), int(hour), int(minute), int(second), 0, time.UTC)
return timestamp, nil
}
// IsTime returns true if the value is a `time.Time`.
func IsTime(v interface{}) bool {
// TODO(dustin): Add test
return reflect.TypeOf(v) == timeType
}
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