zircon/system/ulib/fvm-host/file-wrapper.cpp

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "fvm-host/file-wrapper.h"

namespace fvm::host {

ssize_t FdWrapper::Read(void* buffer, size_t count) {
    return read(fd_, buffer, count);
}

ssize_t FdWrapper::Write(void* buffer, size_t count) {
    return write(fd_, buffer, count);
}

ssize_t FdWrapper::Seek(off_t offset, int whence) {
    return lseek(fd_, offset, whence);
}

ssize_t FdWrapper::Size() {
    off_t curr = lseek(fd_, 0, SEEK_CUR);
    off_t size = lseek(fd_, 0, SEEK_END);
    lseek(fd_, curr, SEEK_SET);
    return size;
}

ssize_t FdWrapper::Tell() {
    return lseek(fd_, 0, SEEK_CUR);
}

zx_status_t FdWrapper::Truncate(size_t size) {
    return ftruncate(fd_, size);
}

zx_status_t FdWrapper::Sync() {
    return fsync(fd_);
}

zx_status_t UniqueFdWrapper::Open(
    const char* path, int flags, mode_t mode, fbl::unique_ptr<UniqueFdWrapper>* out) {
    fbl::unique_fd fd(open(path, flags, mode));
    if (!fd) {
        return ZX_ERR_IO;
    }

    *out = std::make_unique<UniqueFdWrapper>(std::move(fd));
    return ZX_OK;
}

ssize_t UniqueFdWrapper::Read(void* buffer, size_t count) {
    return read(fd_.get(), buffer, count);
}

ssize_t UniqueFdWrapper::Write(void* buffer, size_t count) {
    return write(fd_.get(), buffer, count);
}

ssize_t UniqueFdWrapper::Seek(off_t offset, int whence) {
    return lseek(fd_.get(), offset, whence);
}

ssize_t UniqueFdWrapper::Size() {
    off_t curr = lseek(fd_.get(), 0, SEEK_CUR);
    off_t size = lseek(fd_.get(), 0, SEEK_END);
    lseek(fd_.get(), curr, SEEK_SET);
    return size;
}

ssize_t UniqueFdWrapper::Tell() {
    return lseek(fd_.get(), 0, SEEK_CUR);
}

zx_status_t UniqueFdWrapper::Truncate(size_t size) {
    return ftruncate(fd_.get(), size);
}

zx_status_t UniqueFdWrapper::Sync() {
    return fsync(fd_.get());
}

} // namespace fvm::host