1 files changed, 121 insertions, 0 deletions

diff --git a/otautil/ZipUtil.cpp b/otautil/ZipUtil.cpp
new file mode 100644
index 000000000..714c956ed
--- /dev/null
+++ b/otautil/ZipUtil.cpp
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2016 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 "ZipUtil.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <utime.h>
+
+#include <string>
+
+#include <android-base/logging.h>
+#include <android-base/unique_fd.h>
+#include <selinux/label.h>
+#include <selinux/selinux.h>
+#include <ziparchive/zip_archive.h>
+
+#include "DirUtil.h"
+
+static constexpr mode_t UNZIP_DIRMODE = 0755;
+static constexpr mode_t UNZIP_FILEMODE = 0644;
+
+bool ExtractPackageRecursive(ZipArchiveHandle zip, const std::string& zip_path,
+                             const std::string& dest_path, const struct utimbuf* timestamp,
+                             struct selabel_handle* sehnd) {
+    if (!zip_path.empty() && zip_path[0] == '/') {
+        LOG(ERROR) << "ExtractPackageRecursive(): zip_path must be a relative path " << zip_path;
+        return false;
+    }
+    if (dest_path.empty() || dest_path[0] != '/') {
+        LOG(ERROR) << "ExtractPackageRecursive(): dest_path must be an absolute path " << dest_path;
+        return false;
+    }
+
+    void* cookie;
+    std::string target_dir(dest_path);
+    if (dest_path.back() != '/') {
+        target_dir += '/';
+    }
+    std::string prefix_path(zip_path);
+    if (!zip_path.empty() && zip_path.back() != '/') {
+        prefix_path += '/';
+    }
+    const ZipString zip_prefix(prefix_path.c_str());
+
+    int ret = StartIteration(zip, &cookie, &zip_prefix, nullptr);
+    if (ret != 0) {
+        LOG(ERROR) << "failed to start iterating zip entries.";
+        return false;
+    }
+
+    std::unique_ptr<void, decltype(&EndIteration)> guard(cookie, EndIteration);
+    ZipEntry entry;
+    ZipString name;
+    int extractCount = 0;
+    while (Next(cookie, &entry, &name) == 0) {
+        std::string entry_name(name.name, name.name + name.name_length);
+        CHECK_LE(prefix_path.size(), entry_name.size());
+        std::string path = target_dir + entry_name.substr(prefix_path.size());
+        // Skip dir.
+        if (path.back() == '/') {
+            continue;
+        }
+        //TODO(b/31917448) handle the symlink.
+
+        if (dirCreateHierarchy(path.c_str(), UNZIP_DIRMODE, timestamp, true, sehnd) != 0) {
+            LOG(ERROR) << "failed to create dir for " << path;
+            return false;
+        }
+
+        char *secontext = NULL;
+        if (sehnd) {
+            selabel_lookup(sehnd, &secontext, path.c_str(), UNZIP_FILEMODE);
+            setfscreatecon(secontext);
+        }
+        android::base::unique_fd fd(open(path.c_str(), O_CREAT|O_WRONLY|O_TRUNC, UNZIP_FILEMODE));
+        if (fd == -1) {
+            PLOG(ERROR) << "Can't create target file \"" << path << "\"";
+            return false;
+        }
+        if (secontext) {
+            freecon(secontext);
+            setfscreatecon(NULL);
+        }
+
+        int err = ExtractEntryToFile(zip, &entry, fd);
+        if (err != 0) {
+            LOG(ERROR) << "Error extracting \"" << path << "\" : " << ErrorCodeString(err);
+            return false;
+        }
+
+        if (fsync(fd) != 0) {
+            PLOG(ERROR) << "Error syncing file descriptor when extracting \"" << path << "\"";
+            return false;
+        }
+
+        if (timestamp != nullptr && utime(path.c_str(), timestamp)) {
+            PLOG(ERROR) << "Error touching \"" << path << "\"";
+            return false;
+        }
+
+        LOG(INFO) << "Extracted file \"" << path << "\"";
+        ++extractCount;
+    }
+
+    LOG(INFO) << "Extracted " << extractCount << " file(s)";
+    return true;
+}