BPI-CM9-Linux/aml-comp/vendor/amlogic/aml_subtitleserver/libsubtitle/io/FileSource.cpp

/*
 * Copyright (C) 2014-2025 Amlogic, Inc. All rights reserved.
 *
 * All information contained herein is Amlogic confidential.
 *
 * This software is provided to you pursuant to Software License Agreement
 * (SLA) with Amlogic Inc ("Amlogic"). This software may be used
 * only in accordance with the terms of this agreement.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification is strictly prohibited without prior written permission from
 * Amlogic.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define LOG_TAG "FileSource"

#include "FileSource.h"

#include <fcntl.h>
#include <unistd.h>
#include <utils/CallStack.h>

#include <string>

#include "IpcDataTypes.h"
#include "SubtitleLog.h"

FileSource::FileSource(int fd, int extFd) {
    SUBTITLE_LOGI("mFd=%d, extFd=%d", fd, extFd);
    mFd = fd;
    if (mFd > 0) {
        ::lseek(mFd, 0, SEEK_SET);
    }

    // mExtraFd is used for SUB_IDX subtitle, which has one index file
    // and one sub data file
    if (extFd > 0) {
        mExtraFd = extFd;
    }
}

FileSource::~FileSource() {
    SUBTITLE_LOGI("mFd=%d", mFd);
    if (mFd > 0) {
        ::close(mFd);
        mFd = -1;
    }

    if (mExtraFd > 0) {
        ::close(mExtraFd);
    }
}

int FileSource::onData(const char* buffer, int len) {
    (void)buffer;
    (void)len;
    return 0;
}

bool FileSource::start() {
    SUBTITLE_LOGI_FUNC_IN();
    return true;
}

bool FileSource::stop() {
    SUBTITLE_LOGI("mFd=%d", mFd);
    return true;
}

SubtitleIOType FileSource::type() {
    return E_SUBTITLE_FILE;
}

bool FileSource::isFileAvailable() {
    SUBTITLE_LOGI_FUNC_IN();
    return (mDumpFd > 0);
}

size_t FileSource::lseek(int offSet, int whence) {
    SUBTITLE_LOGI_FUNC_IN();
    if (mFd > 0) {
        return ::lseek(mFd, offSet, whence);
    } else {
        return 0;
    }
}

size_t FileSource::availableDataSize() {
    int len = 0;
    if (mFd > 0) {
        len = ::lseek(mFd, 0L, SEEK_END);
        lseek(0, SEEK_SET);
    }
    return len;
}

size_t FileSource::read(void* buffer, size_t size) {
    size_t ret = ::read(mFd, buffer, size);
    if (ret < 0) {
        SUBTITLE_LOGE("%m");
        // Read one more time
        if (errno == EINTR || errno == EAGAIN) {
            ret = ::read(mFd, buffer, size);
        }
    }

    if (ret != size) {
        SUBTITLE_LOGI("requested size=%zu, but ret=%zu", size, ret);
    }
    return ret;
}

void FileSource::dump(int fd, const char* prefix) {
    (void)prefix;
    dprintf(fd, "\nFileSource:\n");
}