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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.gallery3d.exif;
import java.io.IOException;
import java.io.InputStream;
public class ExifReader {
public ExifData getExifData(InputStream inputStream) throws ExifInvalidFormatException,
IOException {
ExifParser parser = new ExifParser();
IfdParser ifdParser = parser.parse(inputStream);
ExifData exifData = new ExifData();
IfdData ifdData = new IfdData(ExifData.TYPE_IFD_0);
parseIfd(ifdParser, ifdData, exifData);
exifData.addIfdData(ifdData);
return exifData;
}
public void parseIfd(IfdParser ifdParser, IfdData ifdData, ExifData exifData)
throws IOException, ExifInvalidFormatException {
int type = ifdParser.next();
while (type != IfdParser.TYPE_END) {
switch (type) {
case IfdParser.TYPE_NEW_TAG:
ExifTag tag = ifdParser.readTag();
if (tag.getDataSize() > 4) {
long offset = ifdParser.readUnsignedInt();
ifdParser.waitValueOfTag(tag, offset);
} else if (tag.getTagId() == ExifTag.TIFF_TAG.TAG_EXIF_IFD
|| tag.getTagId() == ExifTag.TIFF_TAG.TAG_GPS_IFD
|| tag.getTagId() == ExifTag.EXIF_TAG.TAG_INTEROPERABILITY_IFD) {
long offset = ifdParser.readUnsignedInt();
ifdParser.waitValueOfTag(tag, offset);
ifdData.addTag(tag, offset);
} else {
readAndSaveTag(tag, ifdParser, ifdData);
}
break;
case IfdParser.TYPE_NEXT_IFD:
IfdData ifd1 = new IfdData(ExifData.TYPE_IFD_1);
parseIfd(ifdParser.parseIfdBlock(), ifd1, exifData);
exifData.addIfdData(ifd1);
break;
case IfdParser.TYPE_VALUE_OF_PREV_TAG:
tag = ifdParser.getCorrespodingExifTag();
if(tag.getTagId() == ExifTag.TIFF_TAG.TAG_EXIF_IFD) {
IfdData ifd = new IfdData(ExifData.TYPE_IFD_EXIF);
parseIfd(ifdParser.parseIfdBlock(), ifd, exifData);
exifData.addIfdData(ifd);
} else if(tag.getTagId() == ExifTag.TIFF_TAG.TAG_GPS_IFD) {
IfdData ifd = new IfdData(ExifData.TYPE_IFD_GPS);
parseIfd(ifdParser.parseIfdBlock(), ifd, exifData);
exifData.addIfdData(ifd);
} else if(tag.getTagId() == ExifTag.EXIF_TAG.TAG_INTEROPERABILITY_IFD) {
IfdData ifd = new IfdData(ExifData.TYPE_IFD_INTEROPERABILITY);
parseIfd(ifdParser.parseIfdBlock(), ifd, exifData);
exifData.addIfdData(ifd);
} else {
readAndSaveTag(tag, ifdParser, ifdData);
}
break;
}
type = ifdParser.next();
}
}
public void readAndSaveTag(ExifTag tag, IfdParser parser, IfdData ifdData)
throws IOException {
switch(tag.getDataType()) {
case ExifTag.TYPE_BYTE:
{
byte buf[] = new byte[tag.getComponentCount()];
parser.read(buf);
ifdData.addTag(tag, buf);
break;
}
case ExifTag.TYPE_ASCII:
ifdData.addTag(tag, parser.readString(tag.getComponentCount()));
break;
case ExifTag.TYPE_INT:
{
long value[] = new long[tag.getComponentCount()];
for (int i = 0, n = value.length; i < n; i++) {
value[i] = parser.readUnsignedInt();
}
ifdData.addTag(tag, value);
break;
}
case ExifTag.TYPE_RATIONAL:
{
Rational value[] = new Rational[tag.getComponentCount()];
for (int i = 0, n = value.length; i < n; i++) {
value[i] = parser.readUnsignedRational();
}
ifdData.addTag(tag, value);
break;
}
case ExifTag.TYPE_SHORT:
{
int value[] = new int[tag.getComponentCount()];
for (int i = 0, n = value.length; i < n; i++) {
value[i] = parser.readUnsignedShort();
}
ifdData.addTag(tag, value);
break;
}
case ExifTag.TYPE_SINT:
{
int value[] = new int[tag.getComponentCount()];
for (int i = 0, n = value.length; i < n; i++) {
value[i] = parser.readInt();
}
ifdData.addTag(tag, value);
break;
}
case ExifTag.TYPE_SRATIONAL:
{
Rational value[] = new Rational[tag.getComponentCount()];
for (int i = 0, n = value.length; i < n; i++) {
value[i] = parser.readRational();
}
ifdData.addTag(tag, value);
break;
}
case ExifTag.TYPE_UNDEFINED:
{
byte buf[] = new byte[tag.getComponentCount()];
parser.read(buf);
ifdData.addTag(tag, buf);
break;
}
}
}
}
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