upload android base code part3

android/dalvik/libdex/DexOptData.cpp

@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+
+/*
+ * Functions to parse and manipulate the additional data tables added
+ * to optimized .dex files.
+ */
+
+#include <zlib.h>
+
+#include "DexOptData.h"
+
+/*
+ * Check to see if a given data pointer is a valid double-word-aligned
+ * pointer into the given memory range (from start inclusive to end
+ * exclusive). Returns true if valid.
+ */
+static bool isValidPointer(const void* ptr, const void* start, const void* end)
+{
+    return (ptr >= start) && (ptr < end) && (((uintptr_t) ptr & 7) == 0);
+}
+
+/* (documented in header file) */
+u4 dexComputeOptChecksum(const DexOptHeader* pOptHeader)
+{
+    const u1* start = (const u1*) pOptHeader + pOptHeader->depsOffset;
+    const u1* end = (const u1*) pOptHeader +
+        pOptHeader->optOffset + pOptHeader->optLength;
+
+    uLong adler = adler32(0L, Z_NULL, 0);
+
+    return (u4) adler32(adler, start, end - start);
+}
+
+/* (documented in header file) */
+bool dexParseOptData(const u1* data, size_t length, DexFile* pDexFile)
+{
+    const void* pOptStart = data + pDexFile->pOptHeader->optOffset;
+    const void* pOptEnd = data + length;
+    const u4* pOpt = (const u4*) pOptStart;
+    u4 optLength = (const u1*) pOptEnd - (const u1*) pOptStart;
+
+    /*
+     * Make sure the opt data start is in range and aligned. This may
+     * seem like a superfluous check, but (a) if the file got
+     * truncated, it might turn out that pOpt >= pOptEnd; and (b)
+     * if the opt data header got corrupted, pOpt might not be
+     * properly aligned. This test will catch both of these cases.
+     */
+    if (!isValidPointer(pOpt, pOptStart, pOptEnd)) {
+        ALOGE("Bogus opt data start pointer");
+        return false;
+    }
+
+    /* Make sure that the opt data length is a whole number of words. */
+    if ((optLength & 3) != 0) {
+        ALOGE("Unaligned opt data area end");
+        return false;
+    }
+
+    /*
+     * Make sure that the opt data area is large enough to have at least
+     * one chunk header.
+     */
+    if (optLength < 8) {
+        ALOGE("Undersized opt data area (%u)", optLength);
+        return false;
+    }
+
+    /* Process chunks until we see the end marker. */
+    while (*pOpt != kDexChunkEnd) {
+        if (!isValidPointer(pOpt + 2, pOptStart, pOptEnd)) {
+            const u4 offset = ((const u1*) pOpt) - data;
+            ALOGE("Bogus opt data content pointer at offset %u", offset);
+            return false;
+        }
+
+        u4 size = *(pOpt + 1);
+        const u1* pOptData = (const u1*) (pOpt + 2);
+
+        /*
+         * The rounded size is 64-bit aligned and includes +8 for the
+         * type/size header (which was extracted immediately above).
+         */
+        u4 roundedSize = (size + 8 + 7) & ~7;
+        const u4* pNextOpt = pOpt + (roundedSize / sizeof(u4));
+
+        if (!isValidPointer(pNextOpt, pOptStart, pOptEnd)) {
+            const u4 offset = ((const u1*) pOpt) - data;
+            ALOGE("Opt data area problem for chunk of size %u at offset %u", size, offset);
+            return false;
+        }
+
+        switch (*pOpt) {
+        case kDexChunkClassLookup:
+            pDexFile->pClassLookup = (const DexClassLookup*) pOptData;
+            break;
+        case kDexChunkRegisterMaps:
+            ALOGV("+++ found register maps, size=%u", size);
+            pDexFile->pRegisterMapPool = pOptData;
+            break;
+        default:
+            ALOGI("Unknown chunk 0x%08x (%c%c%c%c), size=%d in opt data area",
+                *pOpt,
+                (char) ((*pOpt) >> 24), (char) ((*pOpt) >> 16),
+                (char) ((*pOpt) >> 8),  (char)  (*pOpt),
+                size);
+            break;
+        }
+
+        pOpt = pNextOpt;
+    }
+
+    return true;
+}