Initial Contribution

1 files changed, 353 insertions, 0 deletions

diff --git a/core/jni/android_util_EventLog.cpp b/core/jni/android_util_EventLog.cpp
new file mode 100644
index 0000000..d0cac18
--- /dev/null
+++ b/core/jni/android_util_EventLog.cpp
@@ -0,0 +1,353 @@
+/*
+ * Copyright (C) 2007 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 <fcntl.h>
+
+#include "JNIHelp.h"
+#include "android_runtime/AndroidRuntime.h"
+#include "jni.h"
+#include "utils/logger.h"
+
+#define END_DELIMITER '\n'
+#define INT_BUFFER_SIZE (sizeof(jbyte)+sizeof(jint)+sizeof(END_DELIMITER))
+#define LONG_BUFFER_SIZE (sizeof(jbyte)+sizeof(jlong)+sizeof(END_DELIMITER))
+#define INITAL_BUFFER_CAPACITY 256
+
+#define MAX(a,b) ((a>b)?a:b)
+
+namespace android {
+
+static jclass gCollectionClass;
+static jmethodID gCollectionAddID;
+
+static jclass gEventClass;
+static jmethodID gEventInitID;
+
+static jclass gIntegerClass;
+static jfieldID gIntegerValueID;
+
+static jclass gListClass;
+static jfieldID gListItemsID;
+
+static jclass gLongClass;
+static jfieldID gLongValueID;
+
+static jclass gStringClass;
+
+struct ByteBuf {
+    size_t len;
+    size_t capacity;
+    uint8_t* buf;
+    
+    ByteBuf(size_t initSize) {
+        buf = (uint8_t*)malloc(initSize);
+        len = 0;
+        capacity = initSize;        
+    }
+    
+    ~ByteBuf() {
+        free(buf);
+    }
+    
+    bool ensureExtraCapacity(size_t extra) {
+        size_t spaceNeeded = len + extra;
+        if (spaceNeeded > capacity) {
+            size_t newCapacity = MAX(spaceNeeded, 2 * capacity);
+            void* newBuf = realloc(buf, newCapacity);
+            if (newBuf == NULL) {
+                return false;
+            }
+            capacity = newCapacity;
+            buf = (uint8_t*)newBuf;
+            return true;
+        } else {
+            return true;
+        }
+    }
+ 
+    void putIntEvent(jint value) {
+        bool succeeded = ensureExtraCapacity(INT_BUFFER_SIZE);
+        buf[len++] = EVENT_TYPE_INT;
+        memcpy(buf+len, &value, sizeof(jint));
+        len += sizeof(jint);
+    }
+
+    void putByte(uint8_t value) {
+        bool succeeded = ensureExtraCapacity(sizeof(uint8_t));
+        buf[len++] = value;
+    }
+
+    void putLongEvent(jlong value) {
+        bool succeeded = ensureExtraCapacity(LONG_BUFFER_SIZE);
+        buf[len++] = EVENT_TYPE_LONG;
+        memcpy(buf+len, &value, sizeof(jlong));
+        len += sizeof(jlong);
+    }
+
+
+    void putStringEvent(JNIEnv* env, jstring value) {
+        const char* strValue = env->GetStringUTFChars(value, NULL);
+        uint32_t strLen = strlen(strValue); //env->GetStringUTFLength(value);
+        bool succeeded = ensureExtraCapacity(1 + sizeof(uint32_t) + strLen);
+        buf[len++] = EVENT_TYPE_STRING;
+        memcpy(buf+len, &strLen, sizeof(uint32_t));
+        len += sizeof(uint32_t);
+        memcpy(buf+len, strValue, strLen);
+        env->ReleaseStringUTFChars(value, strValue);
+        len += strLen;
+    }
+
+    void putList(JNIEnv* env, jobject list) {
+        jobjectArray items = (jobjectArray) env->GetObjectField(list, gListItemsID);
+        if (items == NULL) {
+            jniThrowException(env, "java/lang/NullPointerException", NULL);
+            return;
+        }
+
+        jsize numItems = env->GetArrayLength(items);
+        putByte(EVENT_TYPE_LIST);
+        putByte(numItems);
+        // We'd like to call GetPrimitveArrayCritical() but that might
+        // not be safe since we're going to be doing some I/O
+        for (int i = 0; i < numItems; i++) {
+            jobject item = env->GetObjectArrayElement(items, i);
+            if (env->IsInstanceOf(item, gIntegerClass)) {
+                jint intVal = env->GetIntField(item, gIntegerValueID);
+                putIntEvent(intVal);
+            } else if (env->IsInstanceOf(item, gLongClass)) {
+                jlong longVal = env->GetLongField(item, gLongValueID);
+                putLongEvent(longVal);
+            } else if (env->IsInstanceOf(item, gStringClass)) {
+                putStringEvent(env, (jstring)item);
+            } else if (env->IsInstanceOf(item, gListClass)) {
+                putList(env, item);
+            } else {
+                jniThrowException(
+                        env,
+                        "java/lang/IllegalArgumentException",
+                        "Attempt to log an illegal item type.");
+                return;
+            }
+            env->DeleteLocalRef(item);
+        }
+
+        env->DeleteLocalRef(items);
+    }
+};
+
+/*
+ * In class android.util.EventLog:
+ *  static native int writeEvent(int tag, int value)
+ */
+static jint android_util_EventLog_writeEvent_Integer(JNIEnv* env, jobject clazz,
+                                                     jint tag, jint value)
+{
+    return android_btWriteLog(tag, EVENT_TYPE_INT, &value, sizeof(value));
+}
+
+/*
+ * In class android.util.EventLog:
+ *  static native int writeEvent(long tag, long value)
+ */
+static jint android_util_EventLog_writeEvent_Long(JNIEnv* env, jobject clazz, 
+                                                  jint tag, jlong value)
+{
+    return android_btWriteLog(tag, EVENT_TYPE_LONG, &value, sizeof(value));
+}
+
+/*
+ * In class android.util.EventLog:
+ *  static native int writeEvent(long tag, List value)
+ */
+static jint android_util_EventLog_writeEvent_List(JNIEnv* env, jobject clazz,
+                                                  jint tag, jobject value) {
+    if (value == NULL) {
+        jclass clazz = env->FindClass("java/lang/IllegalArgumentException");
+        env->ThrowNew(clazz, "writeEvent needs a value.");
+        return -1;
+    }
+    ByteBuf byteBuf(INITAL_BUFFER_CAPACITY);
+    byteBuf.putList(env, value);
+    byteBuf.putByte((uint8_t)END_DELIMITER);
+    int numBytesPut = byteBuf.len;
+    int bytesWritten = android_bWriteLog(tag, byteBuf.buf, numBytesPut);
+    return bytesWritten;
+}
+
+/*
+ * In class android.util.EventLog:
+ *  static native int writeEvent(int tag, String value)
+ */
+static jint android_util_EventLog_writeEvent_String(JNIEnv* env, jobject clazz,
+                                                    jint tag, jstring value) {
+    if (value == NULL) {
+        jclass clazz = env->FindClass("java/lang/IllegalArgumentException");
+        env->ThrowNew(clazz, "logEvent needs a value.");
+        return -1;
+    }
+
+    ByteBuf byteBuf(INITAL_BUFFER_CAPACITY);
+    byteBuf.putStringEvent(env, value);
+    byteBuf.putByte((uint8_t)END_DELIMITER);
+    int numBytesPut = byteBuf.len;
+    int bytesWritten = android_bWriteLog(tag, byteBuf.buf, numBytesPut);
+    return bytesWritten;
+}
+
+/*
+ * In class android.util.EventLog:
+ *  static native void readEvents(int[] tags, Collection<Event> output)
+ */
+static void android_util_EventLog_readEvents(JNIEnv* env, jobject clazz,
+                                             jintArray tags,
+                                             jobject out) {
+    if (tags == NULL || out == NULL) {
+        jniThrowException(env, "java/lang/NullPointerException", NULL);
+        return;
+    }
+
+    int fd = open("/dev/" LOGGER_LOG_EVENTS, O_RDONLY | O_NONBLOCK);
+    if (fd < 0) {
+        jniThrowIOException(env, errno);
+        return;
+    }
+
+    jsize tagLength = env->GetArrayLength(tags);
+    jint *tagValues = env->GetIntArrayElements(tags, NULL);
+
+    uint8_t buf[LOGGER_ENTRY_MAX_LEN];
+    for (;;) {
+        int len = read(fd, buf, sizeof(buf));
+        if (len == 0 || (len < 0 && errno == EAGAIN)) {
+            break;
+        } else if (len < 0) {
+            // This calls env->ThrowNew(), which doesn't throw an exception
+            // now, but sets a flag to trigger an exception after we return.
+            jniThrowIOException(env, errno);
+            break;
+        } else if ((size_t) len < sizeof(logger_entry) + sizeof(int32_t)) {
+            jniThrowException(env, "java/io/IOException", "Event too short");
+            break;
+        }
+
+        logger_entry* entry = (logger_entry*) buf;
+        int32_t tag = * (int32_t*) (buf + sizeof(*entry));
+
+        int found = 0;
+        for (int i = 0; !found && i < tagLength; ++i) {
+            found = (tag == tagValues[i]);
+        }
+
+        if (found) {
+            jsize len = sizeof(*entry) + entry->len;
+            jbyteArray array = env->NewByteArray(len);
+            if (array == NULL) break;
+
+            jbyte *bytes = env->GetByteArrayElements(array, NULL);
+            memcpy(bytes, buf, len);
+            env->ReleaseByteArrayElements(array, bytes, 0);
+
+            jobject event = env->NewObject(gEventClass, gEventInitID, array);
+            if (event == NULL) break;
+
+            env->CallBooleanMethod(out, gCollectionAddID, event);
+            env->DeleteLocalRef(event);
+            env->DeleteLocalRef(array);
+        }
+    }
+
+    close(fd);
+    env->ReleaseIntArrayElements(tags, tagValues, 0);
+}
+
+
+/*
+ * JNI registration.
+ */
+static JNINativeMethod gRegisterMethods[] = {
+    /* name, signature, funcPtr */
+    { "writeEvent", "(II)I", (void*) android_util_EventLog_writeEvent_Integer },
+    { "writeEvent", "(IJ)I", (void*) android_util_EventLog_writeEvent_Long },
+    { "writeEvent",
+      "(ILjava/lang/String;)I",
+      (void*) android_util_EventLog_writeEvent_String
+    },
+    { "writeEvent",
+      "(ILandroid/util/EventLog$List;)I",
+      (void*) android_util_EventLog_writeEvent_List
+    },
+    { "readEvents",
+      "([ILjava/util/Collection;)V",
+      (void*) android_util_EventLog_readEvents
+    }
+};
+
+static struct { const char *name; jclass *clazz; } gClasses[] = {
+    { "android/util/EventLog$Event", &gEventClass },
+    { "android/util/EventLog$List", &gListClass },
+    { "java/lang/Integer", &gIntegerClass },
+    { "java/lang/Long", &gLongClass },
+    { "java/lang/String", &gStringClass },
+    { "java/util/Collection", &gCollectionClass },
+};
+
+static struct { jclass *c; const char *name, *ft; jfieldID *id; } gFields[] = {
+    { &gIntegerClass, "value", "I", &gIntegerValueID },
+    { &gListClass, "mItems", "[Ljava/lang/Object;", &gListItemsID },
+    { &gLongClass, "value", "J", &gLongValueID },
+};
+
+static struct { jclass *c; const char *name, *mt; jmethodID *id; } gMethods[] = {
+    { &gEventClass, "<init>", "([B)V", &gEventInitID },
+    { &gCollectionClass, "add", "(Ljava/lang/Object;)Z", &gCollectionAddID },
+};
+
+int register_android_util_EventLog(JNIEnv* env) {
+    for (int i = 0; i < NELEM(gClasses); ++i) {
+        jclass clazz = env->FindClass(gClasses[i].name);
+        if (clazz == NULL) {
+            LOGE("Can't find class: %s\n", gClasses[i].name);
+            return -1;
+        }
+        *gClasses[i].clazz = (jclass) env->NewGlobalRef(clazz);
+    }
+
+    for (int i = 0; i < NELEM(gFields); ++i) {
+        *gFields[i].id = env->GetFieldID(
+                *gFields[i].c, gFields[i].name, gFields[i].ft);
+        if (*gFields[i].id == NULL) {
+            LOGE("Can't find field: %s\n", gFields[i].name);
+            return -1;
+        }
+    }
+
+    for (int i = 0; i < NELEM(gMethods); ++i) {
+        *gMethods[i].id = env->GetMethodID(
+                *gMethods[i].c, gMethods[i].name, gMethods[i].mt);
+        if (*gMethods[i].id == NULL) {
+            LOGE("Can't find method: %s\n", gMethods[i].name);
+            return -1;
+        }
+    }
+
+    return AndroidRuntime::registerNativeMethods(
+            env,
+            "android/util/EventLog",
+            gRegisterMethods, NELEM(gRegisterMethods));
+}
+
+}; // namespace android
+