Tokenizer.cpp

/*
 * 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 <utils/Tokenizer.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <utils/Log.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) != nullptr;
}

Tokenizer::Tokenizer(const String8& filename, FileMap* fileMap, char* buffer,
        bool ownBuffer, size_t length) :
        mFilename(filename), mFileMap(fileMap),
        mBuffer(buffer), mOwnBuffer(ownBuffer), mLength(length),
        mCurrent(buffer), mLineNumber(1) {
}

Tokenizer::~Tokenizer() {
    delete mFileMap;
    if (mOwnBuffer) {
        delete[] mBuffer;
    }
}

status_t Tokenizer::open(const String8& filename, Tokenizer** outTokenizer) {
    *outTokenizer = nullptr;

    int result = NO_ERROR;
    int fd = ::open(filename.string(), O_RDONLY);
    if (fd < 0) {
        result = -errno;
        ALOGE("Error opening file '%s': %s", filename.string(), strerror(errno));
    } else {
        struct stat stat;
        if (fstat(fd, &stat)) {
            result = -errno;
            ALOGE("Error getting size of file '%s': %s", filename.string(), strerror(errno));
        } else {
            size_t length = size_t(stat.st_size);

            FileMap* fileMap = new FileMap();
            bool ownBuffer = false;
            char* buffer;
            if (fileMap->create(nullptr, fd, 0, length, true)) {
                fileMap->advise(FileMap::SEQUENTIAL);
                buffer = static_cast<char*>(fileMap->getDataPtr());
            } else {