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Add header with low level I/O helpers.
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| /* | ||
| * Software License Agreement (BSD License) | ||
| * | ||
| * Point Cloud Library (PCL) - www.pointclouds.org | ||
| * Copyright (c) 2018 Fizyr BV. - https://fizyr.com | ||
| * | ||
| * All rights reserved. | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * * Redistributions in binary form must reproduce the above | ||
| * copyright notice, this list of conditions and the following | ||
| * disclaimer in the documentation and/or other materials provided | ||
| * with the distribution. | ||
| * * Neither the name of the copyright holder(s) nor the names of its | ||
| * contributors may be used to endorse or promote products derived | ||
| * from this software without specific prior written permission. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| /** | ||
| * This file defines compatibility wrappers for low level I/O functions. | ||
| * Implemented as inlinable functions to prevent any performance overhead. | ||
| */ | ||
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| #ifndef __PCL_IO_HELPERS__ | ||
| #define __PCL_IO_HELPERS__ | ||
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| #ifdef _WIN32 | ||
| # ifndef WIN32_LEAN_AND_MEAN | ||
| # define WIN32_LEAN_AND_MEAN | ||
| # endif | ||
| # ifndef NOMINMAX | ||
| # define NOMINMAX | ||
| # endif | ||
| # include <io.h> | ||
| # include <windows.h> | ||
| # include <BaseTsd.h> | ||
| #else | ||
| # include <unistd.h> | ||
| # include <sys/mman.h> | ||
| # include <sys/types.h> | ||
| # include <sys/stat.h> | ||
| # include <sys/fcntl.h> | ||
| #endif | ||
|
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| namespace pcl | ||
| { | ||
| namespace io | ||
| { | ||
| #ifdef _WIN32 | ||
| typedef SSIZE_T ssize_t; | ||
|
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| inline int pcl_open(const char * pathname, int flags, int mode) | ||
| { | ||
| return ::_open(pathname, flags, mode); | ||
| } | ||
|
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| inline int pcl_open(const char * pathname, int flags) | ||
| { | ||
| return ::_open(pathname, flags); | ||
| } | ||
|
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| inline int pcl_close(int fd) | ||
| { | ||
| return ::_close(fd); | ||
| } | ||
|
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| inline int pcl_lseek(int fd, long offset, int whence) | ||
| { | ||
| return ::_lseek(fd, offset, whence); | ||
| } | ||
|
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| inline int pcl_read(int fd, void * buffer, size_t count) | ||
| { | ||
| return ::_read(fd, buffer, count); | ||
| } | ||
|
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| inline int pcl_write(int fd, const void * buffer, size_t count) | ||
| { | ||
| return ::_write(fd, buffer, count); | ||
| } | ||
|
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| inline int pcl_fallocate(int fd, off_t len) | ||
| { | ||
| return ::chsize(fd, len); | ||
| } | ||
| #else | ||
| inline int pcl_open(const char * pathname, int flags, int mode) | ||
| { | ||
| return ::open(pathname, flags, mode); | ||
| } | ||
|
|
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| inline int pcl_open(const char * pathname, int flags) | ||
| { | ||
| return ::open(pathname, flags); | ||
| } | ||
|
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| inline int pcl_close(int fd) | ||
| { | ||
| return ::close(fd); | ||
| } | ||
|
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| inline off_t pcl_lseek(int fd, off_t offset, int whence) | ||
| { | ||
| return ::lseek(fd, offset, whence); | ||
| } | ||
|
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| inline ssize_t pcl_read(int fd, void * buffer, size_t count) | ||
| { | ||
| return ::read(fd, buffer, count); | ||
| } | ||
|
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| inline ssize_t pcl_write(int fd, const void * buffer, size_t count) | ||
| { | ||
| return ::write(fd, buffer, count); | ||
| } | ||
|
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| # ifndef __APPLE__ | ||
| inline int pcl_fallocate(int fd, off_t len) | ||
| { | ||
| return ::posix_fallocate(fd, 0, len); | ||
| } | ||
| # else | ||
| inline int pcl_fallocate(int fd, off_t len) | ||
| { | ||
| // Try to allocate contiguous space first. | ||
| ::fstore_t store = {F_ALLOCATEALL | F_ALLOCATECONTIG, F_PEOFPOSMODE, 0, len}; | ||
| if (::fcntl(fd, F_PREALLOCATE, &store) < 0) | ||
| { | ||
| // Try fragmented if that failed. | ||
| store.fst_flags = F_ALLOCATEALL; | ||
| int ret = ::fcntl(fd, F_PREALLOCATE, &store); | ||
|
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| // Bail if it still failed. | ||
| if (ret < 0) { | ||
| return ret; | ||
| } | ||
| } | ||
|
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| // File could be larger than requested, so truncate. | ||
| return ::ftruncate(fd, len); | ||
| } | ||
| #endif | ||
|
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| } | ||
| } | ||
|
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| #endif | ||
| #endif // __PCL_IO_HELPERS__ |
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