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 * Copyright 2013, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package org.jf.dexlib2.dexbacked.raw;

import org.jf.dexlib2.dexbacked.DexBackedDexFile;
import org.jf.dexlib2.dexbacked.raw.util.DexAnnotator;
import org.jf.dexlib2.util.AnnotatedBytes;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class FieldIdItem {
    public static final int ITEM_SIZE = 8;

    public static final int CLASS_OFFSET = 0;
    public static final int TYPE_OFFSET = 2;
    public static final int NAME_OFFSET = 4;

    @Nonnull
    public static SectionAnnotator makeAnnotator(@Nonnull DexAnnotator annotator, @Nonnull MapItem mapItem) {
        return new SectionAnnotator(annotator, mapItem) {
            @Nonnull @Override public String getItemName() {
                return "field_id_item";
            }

            @Override
            protected void annotateItem(@Nonnull AnnotatedBytes out, int itemIndex, @Nullable String itemIdentity) {
                int classIndex = dexFile.getBuffer().readUshort(out.getCursor());
                out.annotate(2, "class_idx = %s", TypeIdItem.getReferenceAnnotation(dexFile, classIndex));

                int typeIndex = dexFile.getBuffer().readUshort(out.getCursor());
                out.annotate(2, "return_type_idx = %s", TypeIdItem.getReferenceAnnotation(dexFile, typeIndex));

                int nameIndex = dexFile.getBuffer().readSmallUint(out.getCursor());
                out.annotate(4, "name_idx = %s", StringIdItem.getReferenceAnnotation(dexFile, nameIndex));
            }
        };
    }

    @Nonnull
    public static String asString(@Nonnull DexBackedDexFile dexFile, int fieldIndex) {
        int fieldOffset = dexFile.getFieldSection().getOffset(fieldIndex);
        int classIndex = dexFile.getBuffer().readUshort(fieldOffset + CLASS_OFFSET);
        String classType = dexFile.getTypeSection().get(classIndex);

        int typeIndex = dexFile.getBuffer().readUshort(fieldOffset + TYPE_OFFSET);
        String fieldType = dexFile.getTypeSection().get(typeIndex);

        int nameIndex = dexFile.getBuffer().readSmallUint(fieldOffset + NAME_OFFSET);
        String fieldName = dexFile.getStringSection().get(nameIndex);

        return String.format("%s->%s:%s", classType, fieldName, fieldType);
    }

    @Nonnull
    public static String getReferenceAnnotation(@Nonnull DexBackedDexFile dexFile, int fieldIndex) {
        try {
            String fieldString = asString(dexFile, fieldIndex);
            return String.format("field_id_item[%d]: %s", fieldIndex, fieldString);
        } catch (Exception ex) {
            ex.printStackTrace(System.err);
        }
        return String.format("field_id_item[%d]", fieldIndex);
    }

    public static String[] getFields(@Nonnull DexBackedDexFile dexFile) {
        MapItem mapItem = dexFile.getMapItemForSection(ItemType.FIELD_ID_ITEM);
        if (mapItem == null) {
            return new String[0];
        }

        int fieldCount = mapItem.getItemCount();
        String[] ret = new String[fieldCount];
        for (int i=0; i<fieldCount; i++) {
            ret[i] = asString(dexFile, i);
        }
        return ret;
    }
}
