1 files changed, 142 insertions, 0 deletions
diff --git a/libdex/OptInvocation.cpp b/libdex/OptInvocation.cpp
new file mode 100644
index 000000000..df5f8d99f
--- /dev/null
+++ b/libdex/OptInvocation.cpp
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+/*
+ * Utility functions for managing an invocation of "dexopt".
+ */
+#include "vm/DalvikVersion.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#include <errno.h>
+
+#include "OptInvocation.h"
+#include "DexFile.h"
+
+static const char* kClassesDex = "classes.dex";
+
+
+/*
+ * Given the filename of a .jar or .dex file, construct the DEX file cache
+ * name.
+ *
+ * For a Jar, "subFileName" is the name of the entry (usually "classes.dex").
+ * For a DEX, it may be NULL.
+ *
+ * Returns a newly-allocated string, or NULL on failure.
+ */
+char* dexOptGenerateCacheFileName(const char* fileName, const char* subFileName)
+{
+    char nameBuf[512];
+    static const char kDexCachePath[] = "dalvik-cache";
+    char absoluteFile[sizeof(nameBuf)];
+    const size_t kBufLen = sizeof(nameBuf) - 1;
+    const char* dataRoot;
+    char* cp;
+
+    /*
+     * Get the absolute path of the Jar or DEX file.
+     */
+    absoluteFile[0] = '\0';
+    if (fileName[0] != '/') {
+        /*
+         * Generate the absolute path.  This doesn't do everything it
+         * should, e.g. if filename is "./out/whatever" it doesn't crunch
+         * the leading "./" out, but it'll do.
+         */
+        if (getcwd(absoluteFile, kBufLen) == NULL) {
+            LOGE("Can't get CWD while opening jar file\n");
+            return NULL;
+        }
+        strncat(absoluteFile, "/", kBufLen);
+    }
+    strncat(absoluteFile, fileName, kBufLen);
+
+    /*
+     * Append the name of the Jar file entry, if any.  This is not currently
+     * required, but will be if we start putting more than one DEX file
+     * in a Jar.
+     */
+    if (subFileName != NULL) {
+        strncat(absoluteFile, "/", kBufLen);
+        strncat(absoluteFile, subFileName, kBufLen);
+    }
+
+    /* Turn the path into a flat filename by replacing
+     * any slashes after the first one with '@' characters.
+     */
+    cp = absoluteFile + 1;
+    while (*cp != '\0') {
+        if (*cp == '/') {
+            *cp = '@';
+        }
+        cp++;
+    }
+
+    /* Build the name of the cache directory.
+     */
+    dataRoot = getenv("ANDROID_DATA");
+    if (dataRoot == NULL)
+        dataRoot = "/data";
+    snprintf(nameBuf, kBufLen, "%s/%s", dataRoot, kDexCachePath);
+
+    /* Tack on the file name for the actual cache file path.
+     */
+    strncat(nameBuf, absoluteFile, kBufLen);
+
+    LOGV("Cache file for '%s' '%s' is '%s'\n", fileName, subFileName, nameBuf);
+    return strdup(nameBuf);
+}
+
+/*
+ * Create a skeletal "opt" header in a new file.  Most of the fields are
+ * initialized to garbage, but we fill in "dexOffset" so others can
+ * see how large the header is.
+ *
+ * "fd" must be positioned at the start of the file.  On return, it will
+ * be positioned just past the header, and the place where the DEX data
+ * should go.
+ *
+ * Returns 0 on success, errno on failure.
+ */
+int dexOptCreateEmptyHeader(int fd)
+{
+    DexOptHeader optHdr;
+    ssize_t actual;
+
+    assert(lseek(fd, 0, SEEK_CUR) == 0);
+
+    /*
+     * The data is only expected to be readable on the current system, so
+     * we just write the structure.  We do need the file offset to be 64-bit
+     * aligned to fulfill a DEX requirement.
+     */
+    assert((sizeof(optHdr) & 0x07) == 0);
+    memset(&optHdr, 0xff, sizeof(optHdr));
+    optHdr.dexOffset = sizeof(optHdr);
+    actual = write(fd, &optHdr, sizeof(optHdr));
+    if (actual != sizeof(optHdr)) {
+        int err = errno ? errno : -1;
+        LOGE("opt header write failed: %s", strerror(errno));
+        return errno;
+    }
+
+    return 0;
+}