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#1222 cataloguing: fixed MPF offset lookup

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Thibault Deckers 2024-10-07 15:19:41 +02:00
parent 2f4d1f5689
commit 306456967e
1 changed files with 16 additions and 5 deletions
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21
android/app/src/main/kotlin/deckers/thibault/aves/metadata/MultiPage.kt
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@ -9,7 +9,6 @@ import android.net.Uri
import android.os.Build
import android.os.ParcelFileDescriptor
import android.util.Log
import androidx.exifinterface.media.ExifInterfaceFork as ExifInterface
import com.adobe.internal.xmp.XMPMeta
import com.drew.imaging.jpeg.JpegSegmentType
import com.drew.metadata.exif.ExifDirectoryBase
@ -30,6 +29,8 @@ import deckers.thibault.aves.utils.StorageUtils
import deckers.thibault.aves.utils.indexOfBytes
import org.beyka.tiffbitmapfactory.TiffBitmapFactory
import java.io.DataInputStream
import java.io.EOFException
import androidx.exifinterface.media.ExifInterfaceFork as ExifInterface
object MultiPage {
private val LOG_TAG = LogUtils.createTag<MultiPage>()
@ -136,21 +137,31 @@ object MultiPage {
// starts after `[APP2 marker (1 byte)] [segment size (2 bytes)] [MPF marker (4 bytes)]`
fun getJpegMpfBaseOffset(context: Context, uri: Uri, sizeBytes: Long?): Int? {
val mimeType = MimeTypes.JPEG
val endMarker = 0xFF
val app2Marker = JpegSegmentType.APP2.byteValue
val mpfMarker = "MPF".toByteArray() + 0x00
try {
Metadata.openSafeInputStream(context, uri, mimeType, sizeBytes)?.use { input ->
var offset = 0
val marker = ByteArray(4)
while (true) {
do {
val b = input.read().toByte()
// look for APP2 marker (0xFFE2)
var found = false
while (!found) {
var i = input.read()
if (i == -1) throw EOFException()
offset++
} while (b != app2Marker)
if (i == endMarker) {
i = input.read()
if (i == -1) throw EOFException()
offset++
found = i.toByte() == app2Marker
}
}
// skip 2 bytes for segment size
input.skip(2)
offset += 2
val marker = ByteArray(4)
input.read(marker, 0, marker.size)
offset += 4
if (marker.contentEquals(mpfMarker)) {