25288281d1
Add basic support to read and write data from/to a file, along with retrieving and setting the current read/write position. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
77 lines
1.4 KiB
C++
77 lines
1.4 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2020, Google Inc.
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*
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* file.h - File I/O operations
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*/
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#ifndef __LIBCAMERA_INTERNAL_FILE_H__
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#define __LIBCAMERA_INTERNAL_FILE_H__
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#include <map>
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#include <string>
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#include <sys/types.h>
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#include <libcamera/span.h>
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namespace libcamera {
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class File
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{
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public:
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enum MapFlag {
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MapNoOption = 0,
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MapPrivate = (1 << 0),
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};
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enum OpenMode {
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NotOpen = 0,
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ReadOnly = (1 << 0),
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WriteOnly = (1 << 1),
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ReadWrite = ReadOnly | WriteOnly,
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};
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File(const std::string &name);
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File();
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~File();
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File(const File &) = delete;
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File &operator=(const File &) = delete;
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const std::string &fileName() const { return name_; }
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void setFileName(const std::string &name);
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bool exists() const;
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bool open(OpenMode mode);
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bool isOpen() const { return fd_ != -1; }
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OpenMode openMode() const { return mode_; }
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void close();
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int error() const { return error_; }
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ssize_t size() const;
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off_t pos() const;
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off_t seek(off_t pos);
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ssize_t read(const Span<uint8_t> &data);
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ssize_t write(const Span<const uint8_t> &data);
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Span<uint8_t> map(off_t offset = 0, ssize_t size = -1,
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MapFlag flags = MapNoOption);
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bool unmap(uint8_t *addr);
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static bool exists(const std::string &name);
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private:
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void unmapAll();
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std::string name_;
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int fd_;
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OpenMode mode_;
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int error_;
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std::map<void *, size_t> maps_;
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};
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_INTERNAL_FILE_H__ */
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