9 files changed, 407 insertions, 12 deletions
diff --git a/hwc2/common/utils/SysTokenizer.cpp b/hwc2/common/utils/SysTokenizer.cpp
new file mode 100644
index 0000000..2855e27
--- a/dev/null
+++ b/hwc2/common/utils/SysTokenizer.cpp
@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2011 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.
+ *  @author   Tellen Yu
+ *  @version  1.0
+ *  @date     2014/11/04
+ *  @par function description:
+ *  - 1 parse file use tokenizer
+ */
+
+#define LOG_TAG "hwcomposer"
+//#define LOG_NDEBUG 0
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <HwcTrace.h>
+
+#include "SysTokenizer.h"
+
+// Enables debug output for the tokenizer.
+#define DEBUG_TOKENIZER 1
+
+static inline bool isDelimiter(char ch, const char* delimiters) {
+    return strchr(delimiters, ch) != NULL;
+}
+
+SysTokenizer::SysTokenizer(const char*filename, char* buffer,
+        bool ownBuffer, size_t length) :
+        mFilename(filename),
+        mBuffer(buffer), mOwnBuffer(ownBuffer), mLength(length),
+        mCurrent(buffer), mLineNumber(1) {
+}
+
+SysTokenizer::~SysTokenizer() {
+    if (mOwnBuffer) {
+        delete[] mBuffer;
+    }
+}
+
+int SysTokenizer::open(const char*filename, SysTokenizer** outTokenizer) {
+    *outTokenizer = NULL;
+
+    int result = 0;
+    int fd = ::open(filename, O_RDONLY);
+    if (fd < 0) {
+        result = -errno;
+        ETRACE("Error opening file '%s', %s.", filename, strerror(errno));
+    } else {
+        struct stat stat;
+        if (fstat(fd, &stat)) {
+            result = -errno;
+            ETRACE("Error getting size of file '%s', %s.", filename, strerror(errno));
+        } else {
+            size_t length = size_t(stat.st_size);
+            bool ownBuffer = false;
+            char* buffer;
+
+            // Fall back to reading into a buffer since we can't mmap files in sysfs.
+            // The length we obtained from stat is wrong too (it will always be 4096)
+            // so we must trust that read will read the entire file.
+            buffer = new char[length];
+            ownBuffer = true;
+            ssize_t nrd = read(fd, buffer, length);
+            if (nrd < 0) {
+                result = -errno;
+                ETRACE("Error reading file '%s', %s.", filename, strerror(errno));
+                delete[] buffer;
+                buffer = NULL;
+            } else {
+                length = size_t(nrd);
+            }
+
+            if (!result) {
+                *outTokenizer = new SysTokenizer(filename, buffer, ownBuffer, length);
+            }
+        }
+        close(fd);
+    }
+    return result;
+}
+
+int SysTokenizer::fromContents(const char*filename,
+        const char* contents, SysTokenizer** outTokenizer) {
+    *outTokenizer = new SysTokenizer(filename,
+            const_cast<char*>(contents), false, strlen(contents));
+    return 0;
+}
+
+char* SysTokenizer::getLocation() const {
+    memset((void*)mStrs, 0 , MAX_STR_LEN);
+    sprintf((char *)mStrs, "%s:%d", mFilename, mLineNumber);
+    return (char *)mStrs;
+}
+
+char* SysTokenizer::peekRemainderOfLine() const {
+    const char* end = getEnd();
+    const char* eol = mCurrent;
+    while (eol != end) {
+        char ch = *eol;
+        if (ch == '\n') {
+            break;
+        }
+        eol += 1;
+    }
+
+    memset((void*)mLine, 0 , MAX_STR_LEN);
+    strncpy((char *)mLine, mCurrent, eol - mCurrent);
+    return (char *)mLine;
+}
+
+char* SysTokenizer::nextToken(const char* delimiters) {
+    const char* end = getEnd();
+    const char* tokenStart = mCurrent;
+
+#if DEBUG_TOKENIZER
+    ITRACE("nextToken mCurrent:%s, delimiters:%s\n", mCurrent, delimiters);
+#endif
+
+    while (mCurrent != end) {
+        char ch = *mCurrent;
+        if (ch == '\n' || isDelimiter(ch, delimiters)) {
+            break;
+        }
+        mCurrent += 1;
+    }
+
+    memset((void*)mStrs, 0 , MAX_STR_LEN);
+    strncpy((char *)mStrs, tokenStart, mCurrent - tokenStart);
+
+#if DEBUG_TOKENIZER
+    ITRACE("nextToken parse end str:%s, num:%d \n", mStrs, mCurrent - tokenStart);
+#endif
+    return (char *)mStrs;
+}
+
+void SysTokenizer::nextLine() {
+#if DEBUG_TOKENIZER
+    VTRACE("nextLine");
+#endif
+    const char* end = getEnd();
+    while (mCurrent != end) {
+        char ch = *(mCurrent++);
+        if (ch == '\n') {
+            mLineNumber += 1;
+            break;
+        }
+    }
+}
+
+void SysTokenizer::skipDelimiters(const char* delimiters) {
+#if DEBUG_TOKENIZER
+    VTRACE("skipDelimiters");
+#endif
+    const char* end = getEnd();
+    while (mCurrent != end) {
+        char ch = *mCurrent;
+        if (ch == '\n' || !isDelimiter(ch, delimiters)) {
+            break;
+        }
+        mCurrent += 1;
+    }
+}
+