Move most of runtime/base to libartbase/base

Enforce the layering that code in runtime/base should not depend on
runtime by separating it into libartbase.  Some of the code in
runtime/base depends on the Runtime class, so it cannot be moved yet.
Also, some of the tests depend on CommonRuntimeTest, which itself needs
to be factored (in a subsequent CL).

Bug: 22322814
Test: make -j 50 checkbuild
      make -j 50 test-art-host

Change-Id: I8b096c1e2542f829eb456b4b057c71421b77d7e2

1 files changed, 64 insertions, 0 deletions

diff --git a/libartbase/base/file_magic.cc b/libartbase/base/file_magic.cc
new file mode 100644
index 0000000000..2b9bed0397
--- /dev/null
+++ b/libartbase/base/file_magic.cc
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#include "file_magic.h"
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+
+#include "base/unix_file/fd_file.h"
+
+namespace art {
+
+using android::base::StringPrintf;
+
+File OpenAndReadMagic(const char* filename, uint32_t* magic, std::string* error_msg) {
+  CHECK(magic != nullptr);
+  File fd(filename, O_RDONLY, /* check_usage */ false);
+  if (fd.Fd() == -1) {
+    *error_msg = StringPrintf("Unable to open '%s' : %s", filename, strerror(errno));
+    return File();
+  }
+  if (!ReadMagicAndReset(fd.Fd(), magic, error_msg)) {
+    StringPrintf("Error in reading magic from file %s: %s", filename, error_msg->c_str());
+    return File();
+  }
+  return fd;
+}
+
+bool ReadMagicAndReset(int fd, uint32_t* magic, std::string* error_msg) {
+  int n = TEMP_FAILURE_RETRY(read(fd, magic, sizeof(*magic)));
+  if (n != sizeof(*magic)) {
+    *error_msg = StringPrintf("Failed to find magic");
+    return false;
+  }
+  if (lseek(fd, 0, SEEK_SET) != 0) {
+    *error_msg = StringPrintf("Failed to seek to beginning of file : %s", strerror(errno));
+    return false;
+  }
+  return true;
+}
+
+bool IsZipMagic(uint32_t magic) {
+  return (('P' == ((magic >> 0) & 0xff)) &&
+          ('K' == ((magic >> 8) & 0xff)));
+}
+
+}  // namespace art