upload android base code part6

android/system/netd/server/UidRanges.cpp

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2014 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 "UidRanges.h"
+
+#include "NetdConstants.h"
+
+#include <inttypes.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#include <android-base/stringprintf.h>
+#include <log/log.h>
+
+using android::base::StringAppendF;
+
+namespace android {
+namespace net {
+
+bool UidRanges::hasUid(uid_t uid) const {
+    if (uid > (unsigned) INT32_MAX) {
+        ALOGW("UID larger than 32 bits: %" PRIu64, static_cast<uint64_t>(uid));
+        return false;
+    }
+    const int32_t intUid = static_cast<int32_t>(uid);
+
+    auto iter = std::lower_bound(mRanges.begin(), mRanges.end(), UidRange(intUid, intUid));
+    return (iter != mRanges.end() && iter->getStart() == intUid) ||
+           (iter != mRanges.begin() && (--iter)->getStop() >= intUid);
+}
+
+const std::vector<UidRange>& UidRanges::getRanges() const {
+    return mRanges;
+}
+
+bool UidRanges::parseFrom(int argc, char* argv[]) {
+    mRanges.clear();
+    for (int i = 0; i < argc; ++i) {
+        if (!*argv[i]) {
+            // The UID string is empty.
+            return false;
+        }
+        char* endPtr;
+        uid_t uidStart = strtoul(argv[i], &endPtr, 0);
+        uid_t uidEnd;
+        if (!*endPtr) {
+            // Found a single UID. The range contains just the one UID.
+            uidEnd = uidStart;
+        } else if (*endPtr == '-') {
+            if (!*++endPtr) {
+                // Unexpected end of string.
+                return false;
+            }
+            uidEnd = strtoul(endPtr, &endPtr, 0);
+            if (*endPtr) {
+                // Illegal trailing chars.
+                return false;
+            }
+            if (uidEnd < uidStart) {
+                // Invalid order.
+                return false;
+            }
+        } else {
+            // Not a single uid, not a range. Found some other illegal char.
+            return false;
+        }
+        if (uidStart == INVALID_UID || uidEnd == INVALID_UID) {
+            // Invalid UIDs.
+            return false;
+        }
+        mRanges.push_back(UidRange(uidStart, uidEnd));
+    }
+    std::sort(mRanges.begin(), mRanges.end());
+    return true;
+}
+
+UidRanges::UidRanges(const std::vector<UidRange>& ranges) {
+    mRanges = ranges;
+    std::sort(mRanges.begin(), mRanges.end());
+}
+
+void UidRanges::add(const UidRanges& other) {
+    auto middle = mRanges.insert(mRanges.end(), other.mRanges.begin(), other.mRanges.end());
+    std::inplace_merge(mRanges.begin(), middle, mRanges.end());
+}
+
+void UidRanges::remove(const UidRanges& other) {
+    auto end = std::set_difference(mRanges.begin(), mRanges.end(), other.mRanges.begin(),
+                                   other.mRanges.end(), mRanges.begin());
+    mRanges.erase(end, mRanges.end());
+}
+
+std::string UidRanges::toString() const {
+    std::string s("UidRanges{ ");
+    for (const auto &range : mRanges) {
+        if (range.length() == 0) {
+            StringAppendF(&s, "<BAD: %u-%u> ", range.getStart(), range.getStop());
+        } else if (range.length() == 1) {
+            StringAppendF(&s, "%u ", range.getStart());
+        } else {
+            StringAppendF(&s, "%u-%u ", range.getStart(), range.getStop());
+        }
+    }
+    StringAppendF(&s, "}");
+    return s;
+}
+
+}  // namespace net
+}  // namespace android