Add several classes from dx tool to the dexgen project

[android-x86/dalvik.git] / dexgen / src / com / android / dexgen / dex / file / HeaderItem.java

diff --git a/dexgen/src/com/android/dexgen/dex/file/HeaderItem.java b/dexgen/src/com/android/dexgen/dex/file/HeaderItem.java
new file mode 100644 (file)
index 0000000..ed04e25
--- /dev/null
+++ b/dexgen/src/com/android/dexgen/dex/file/HeaderItem.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2007 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.dexgen.dex.file;
+
+import com.android.dexgen.rop.cst.CstUtf8;
+import com.android.dexgen.util.AnnotatedOutput;
+import com.android.dexgen.util.Hex;
+
+/**
+ * File header section of a {@code .dex} file.
+ */
+public final class HeaderItem extends IndexedItem {
+    /**
+     * {@code non-null;} the file format magic number, represented as the
+     * low-order bytes of a string
+     */
+    private static final String MAGIC = "dex\n035\0";
+
+    /** size of this section, in bytes */
+    private static final int HEADER_SIZE = 0x70;
+
+    /** the endianness tag */
+    private static final int ENDIAN_TAG = 0x12345678;
+
+    /**
+     * Constructs an instance.
+     */
+    public HeaderItem() {
+        // This space intentionally left blank.
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public ItemType itemType() {
+        return ItemType.TYPE_HEADER_ITEM;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public int writeSize() {
+        return HEADER_SIZE;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void addContents(DexFile file) {
+        // Nothing to do here.
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void writeTo(DexFile file, AnnotatedOutput out) {
+        int mapOff = file.getMap().getFileOffset();
+        Section firstDataSection = file.getFirstDataSection();
+        Section lastDataSection = file.getLastDataSection();
+        int dataOff = firstDataSection.getFileOffset();
+        int dataSize = lastDataSection.getFileOffset() +
+            lastDataSection.writeSize() - dataOff;
+
+        if (out.annotates()) {
+            out.annotate(8, "magic: " + new CstUtf8(MAGIC).toQuoted());
+            out.annotate(4, "checksum");
+            out.annotate(20, "signature");
+            out.annotate(4, "file_size:       " +
+                         Hex.u4(file.getFileSize()));
+            out.annotate(4, "header_size:     " + Hex.u4(HEADER_SIZE));
+            out.annotate(4, "endian_tag:      " + Hex.u4(ENDIAN_TAG));
+            out.annotate(4, "link_size:       0");
+            out.annotate(4, "link_off:        0");
+            out.annotate(4, "map_off:         " + Hex.u4(mapOff));
+        }
+
+        // Write the magic number.
+        for (int i = 0; i < 8; i++) {
+            out.writeByte(MAGIC.charAt(i));
+        }
+
+        // Leave space for the checksum and signature.
+        out.writeZeroes(24);
+
+        out.writeInt(file.getFileSize());
+        out.writeInt(HEADER_SIZE);
+        out.writeInt(ENDIAN_TAG);
+
+        /*
+         * Write zeroes for the link size and data, as the output
+         * isn't a staticly linked file.
+         */
+        out.writeZeroes(8);
+
+        out.writeInt(mapOff);
+
+        // Write out each section's respective header part.
+        file.getStringIds().writeHeaderPart(out);
+        file.getTypeIds().writeHeaderPart(out);
+        file.getProtoIds().writeHeaderPart(out);
+        file.getFieldIds().writeHeaderPart(out);
+        file.getMethodIds().writeHeaderPart(out);
+        file.getClassDefs().writeHeaderPart(out);
+
+        if (out.annotates()) {
+            out.annotate(4, "data_size:       " + Hex.u4(dataSize));
+            out.annotate(4, "data_off:        " + Hex.u4(dataOff));
+        }
+
+        out.writeInt(dataSize);
+        out.writeInt(dataOff);
+    }
+}