diff --git a/include/utils/String8.h b/include/utils/String8.h
index b36f128..6abfb06 100644
--- a/include/utils/String8.h
+++ b/include/utils/String8.h
@@ -22,6 +22,7 @@
 #include <utils/Unicode.h>
 
 #include <string.h> // for strcmp
+#include <stdarg.h>
 
 // ---------------------------------------------------------------------------
 
@@ -70,6 +71,7 @@
 
             status_t            appendFormat(const char* fmt, ...)
                     __attribute__((format (printf, 2, 3)));
+            status_t            appendFormatV(const char* fmt, va_list args);
 
             // Note that this function takes O(N) time to calculate the value.
             // No cache value is stored.
diff --git a/include/utils/Tokenizer.h b/include/utils/Tokenizer.h
new file mode 100644
index 0000000..bfe8923
--- /dev/null
+++ b/include/utils/Tokenizer.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+
+#ifndef _UTILS_TOKENIZER_H
+#define _UTILS_TOKENIZER_H
+
+#include <assert.h>
+#include <utils/Errors.h>
+#include <utils/String8.h>
+
+namespace android {
+
+/**
+ * A simple tokenizer for loading and parsing ASCII text files line by line.
+ */
+class Tokenizer {
+    Tokenizer(const String8& filename, const char* buffer, size_t length);
+
+public:
+    ~Tokenizer();
+
+    /**
+     * Opens a file and maps it into memory.
+     *
+     * Returns NO_ERROR and a tokenizer for the file, if successful.
+     * Otherwise returns an error and sets outTokenizer to NULL.
+     */
+    static status_t open(const String8& filename, Tokenizer** outTokenizer);
+
+    /**
+     * Returns true if at the end of the file.
+     */
+    inline bool isEof() const { return mCurrent == getEnd(); }
+
+    /**
+     * Returns true if at the end of the line or end of the file.
+     */
+    inline bool isEol() const { return isEof() || *mCurrent == '\n'; }
+
+    /**
+     * Gets the name of the file.
+     */
+    inline String8 getFilename() const { return mFilename; }
+
+    /**
+     * Gets a 1-based line number index for the current position.
+     */
+    inline int32_t getLineNumber() const { return mLineNumber; }
+
+    /**
+     * Formats a location string consisting of the filename and current line number.
+     * Returns a string like "MyFile.txt:33".
+     */
+    String8 getLocation() const;
+
+    /**
+     * Gets the character at the current position.
+     * Returns null at end of file.
+     */
+    inline char peekChar() const { return isEof() ? '\0' : *mCurrent; }
+
+    /**
+     * Gets the remainder of the current line as a string, excluding the newline character.
+     */
+    String8 peekRemainderOfLine() const;
+
+    /**
+     * Gets the character at the current position and advances past it.
+     * Returns null at end of file.
+     */
+    inline char nextChar() { return isEof() ? '\0' : *(mCurrent++); }
+
+    /**
+     * Gets the next token on this line stopping at the specified delimiters
+     * or the end of the line whichever comes first and advances past it.
+     * Also stops at embedded nulls.
+     * Returns the token or an empty string if the current character is a delimiter
+     * or is at the end of the line.
+     */
+    String8 nextToken(const char* delimiters);
+
+    /**
+     * Advances to the next line.
+     * Does nothing if already at the end of the file.
+     */
+    void nextLine();
+
+    /**
+     * Skips over the specified delimiters in the line.
+     * Also skips embedded nulls.
+     */
+    void skipDelimiters(const char* delimiters);
+
+private:
+    Tokenizer(const Tokenizer& other); // not copyable
+
+    String8 mFilename;
+    const char* mBuffer;
+    size_t mLength;
+
+    const char* mCurrent;
+    int32_t mLineNumber;
+
+    inline const char* getEnd() const { return mBuffer + mLength; }
+
+};
+
+} // namespace android
+
+#endif // _UTILS_TOKENIZER_H
diff --git a/libs/utils/Android.mk b/libs/utils/Android.mk
index 05a9674..9c01aea 100644
--- a/libs/utils/Android.mk
+++ b/libs/utils/Android.mk
@@ -41,6 +41,7 @@
 	TextOutput.cpp \
 	Threads.cpp \
 	Timers.cpp \
+	Tokenizer.cpp \
 	Unicode.cpp \
 	VectorImpl.cpp \
 	ZipFileCRO.cpp \
diff --git a/libs/utils/String8.cpp b/libs/utils/String8.cpp
index c8dc083..e531a2a 100644
--- a/libs/utils/String8.cpp
+++ b/libs/utils/String8.cpp
@@ -282,22 +282,28 @@
 
 status_t String8::appendFormat(const char* fmt, ...)
 {
-    va_list ap;
-    va_start(ap, fmt);
+    va_list args;
+    va_start(args, fmt);
 
+    status_t result = appendFormatV(fmt, args);
+
+    va_end(args);
+    return result;
+}
+
+status_t String8::appendFormatV(const char* fmt, va_list args)
+{
     int result = NO_ERROR;
-    int n = vsnprintf(NULL, 0, fmt, ap);
+    int n = vsnprintf(NULL, 0, fmt, args);
     if (n != 0) {
         size_t oldLength = length();
         char* buf = lockBuffer(oldLength + n);
         if (buf) {
-            vsnprintf(buf + oldLength, n + 1, fmt, ap);
+            vsnprintf(buf + oldLength, n + 1, fmt, args);
         } else {
             result = NO_MEMORY;
         }
     }
-
-    va_end(ap);
     return result;
 }
 
diff --git a/libs/utils/Tokenizer.cpp b/libs/utils/Tokenizer.cpp
new file mode 100644
index 0000000..19dadf0
--- /dev/null
+++ b/libs/utils/Tokenizer.cpp
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+
+#define LOG_TAG "Tokenizer"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <utils/Log.h>
+#include <utils/Tokenizer.h>
+
+// Enables debug output for the tokenizer.
+#define DEBUG_TOKENIZER 0
+
+
+namespace android {
+
+static inline bool isDelimiter(char ch, const char* delimiters) {
+    return strchr(delimiters, ch) != NULL;
+}
+
+
+Tokenizer::Tokenizer(const String8& filename, const char* buffer, size_t length) :
+        mFilename(filename), mBuffer(buffer), mLength(length),
+        mCurrent(buffer), mLineNumber(1) {
+}
+
+Tokenizer::~Tokenizer() {
+    munmap((void*)mBuffer, mLength);
+}
+
+status_t Tokenizer::open(const String8& filename, Tokenizer** outTokenizer) {
+    *outTokenizer = NULL;
+
+    int result = NO_ERROR;
+    int fd = ::open(filename.string(), O_RDONLY);
+    if (fd < 0) {
+        result = -errno;
+        LOGE("Error opening file '%s', %s.", filename.string(), strerror(errno));
+    } else {
+        struct stat64 stat;
+        if (fstat64(fd, &stat)) {
+            result = -errno;
+            LOGE("Error getting size of file '%s', %s.", filename.string(), strerror(errno));
+        } else {
+            size_t length = size_t(stat.st_size);
+            void* buffer = mmap(NULL, length, PROT_READ, MAP_FILE | MAP_PRIVATE, fd, 0);
+            if (buffer == MAP_FAILED) {
+                result = -errno;
+                LOGE("Error mapping file '%s', %s.", filename.string(), strerror(errno));
+            } else {
+                if (madvise(buffer, length, MADV_SEQUENTIAL)) {
+                    LOGW("Error calling madvise for mmapped file '%s', %s.", filename.string(),
+                            strerror(errno));
+                }
+
+                *outTokenizer = new Tokenizer(filename, static_cast<const char*>(buffer), length);
+                if (!*outTokenizer) {
+                    result = NO_MEMORY;
+                    LOGE("Error allocating tokenizer for file=%s.", filename.string());
+                    munmap(buffer, length);
+                }
+            }
+        }
+        close(fd);
+    }
+    return result;
+}
+
+String8 Tokenizer::getLocation() const {
+    String8 result;
+    result.appendFormat("%s:%d", mFilename.string(), mLineNumber);
+    return result;
+}
+
+String8 Tokenizer::peekRemainderOfLine() const {
+    const char* end = getEnd();
+    const char* eol = mCurrent;
+    while (eol != end) {
+        char ch = *eol;
+        if (ch == '\n') {
+            break;
+        }
+        eol += 1;
+    }
+    return String8(mCurrent, eol - mCurrent);
+}
+
+String8 Tokenizer::nextToken(const char* delimiters) {
+#if DEBUG_TOKENIZER
+    LOGD("nextToken");
+#endif
+    const char* end = getEnd();
+    const char* tokenStart = mCurrent;
+    while (mCurrent != end) {
+        char ch = *mCurrent;
+        if (ch == '\n' || isDelimiter(ch, delimiters)) {
+            break;
+        }
+        mCurrent += 1;
+    }
+    return String8(tokenStart, mCurrent - tokenStart);
+}
+
+void Tokenizer::nextLine() {
+#if DEBUG_TOKENIZER
+    LOGD("nextLine");
+#endif
+    const char* end = getEnd();
+    while (mCurrent != end) {
+        char ch = *(mCurrent++);
+        if (ch == '\n') {
+            mLineNumber += 1;
+            break;
+        }
+    }
+}
+
+void Tokenizer::skipDelimiters(const char* delimiters) {
+#if DEBUG_TOKENIZER
+    LOGD("skipDelimiters");
+#endif
+    const char* end = getEnd();
+    while (mCurrent != end) {
+        char ch = *mCurrent;
+        if (ch == '\n' || !isDelimiter(ch, delimiters)) {
+            break;
+        }
+        mCurrent += 1;
+    }
+}
+
+} // namespace android