nlib
MemoryInputStream.h
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1 
2 /*--------------------------------------------------------------------------------*
3  Project: CrossRoad
4  Copyright (C)Nintendo All rights reserved.
5 
6  These coded instructions, statements, and computer programs contain proprietary
7  information of Nintendo and/or its licensed developers and are protected by
8  national and international copyright laws. They may not be disclosed to third
9  parties or copied or duplicated in any form, in whole or in part, without the
10  prior written consent of Nintendo.
11 
12  The content herein is highly confidential and should be handled accordingly.
13  *--------------------------------------------------------------------------------*/
14 
15 #pragma once
16 #ifndef INCLUDE_NN_NLIB_MEMORYINPUTSTREAM_H_
17 #define INCLUDE_NN_NLIB_MEMORYINPUTSTREAM_H_
18 
19 #include "nn/nlib/InputStream.h"
20 
21 NLIB_NAMESPACE_BEGIN
22 
24  public:
25  NLIB_CEXPR MemoryInputStream() NLIB_NOEXCEPT : mis_buf_(nullptr), mis_size_(0) {}
27  template <class T, size_t N>
28  NLIB_CEXPR explicit MemoryInputStream(const T (&buf)[N]) NLIB_NOEXCEPT
29  : mis_buf_(static_cast<const nlib_byte_t*>(static_cast<const void*>(&buf[0]))),
30  mis_size_(N * sizeof(T)) {
31  // T must be pod
32  }
33  NLIB_CEXPR MemoryInputStream(const void* buf, size_t n) NLIB_NOEXCEPT
34  : mis_buf_(static_cast<const nlib_byte_t*>(buf)), mis_size_(n) {}
35  template <class T, size_t N>
36  errno_t Init(const T (&buf)[N]) NLIB_NOEXCEPT {
37  return this->Init(&buf[0], N * sizeof(T));
38  }
39  errno_t Init(const nlib_byte_t* buf, size_t n) NLIB_NOEXCEPT NLIB_NONNULL;
40  errno_t Init(const void* buf, size_t n) NLIB_NOEXCEPT {
41  return Init(static_cast<const nlib_byte_t*>(buf), n);
42  }
43 
44  private:
45  virtual size_t FillBuffer_(void* p, size_t nbytes) NLIB_NOEXCEPT NLIB_OVERRIDE;
46  virtual bool Close_() NLIB_NOEXCEPT NLIB_OVERRIDE {
47  mis_buf_ = nullptr;
48  mis_size_ = 0;
49  return true;
50  }
51 
52  private:
53  const nlib_byte_t* mis_buf_;
54  size_t mis_size_;
56 };
57 
58 NLIB_NAMESPACE_END
59 
60 #endif // INCLUDE_NN_NLIB_MEMORYINPUTSTREAM_H_
errno_t Init(const void *buf, size_t n) noexcept
Initializes MemoryInputStream and makes it available for use.
#define NLIB_OVERRIDE
Defines override if it is available for use. If not, holds an empty string.
Definition: Config.h:244
#define NLIB_DISALLOW_COPY_AND_ASSIGN(TypeName)
Prohibits use of the copy constructor and assignment operator for the class specified by TypeName...
Definition: Config.h:179
Defines the base class for input streams.
#define NLIB_VIS_PUBLIC
Symbols for functions and classes are made available outside of the library.
Definition: Platform_unix.h:89
constexpr MemoryInputStream() noexcept
Instantiates the object with default parameters (default constructor). You must call the Init functio...
constexpr MemoryInputStream(const void *buf, size_t n) noexcept
Constructs and initializes MemoryInputStream.
constexpr MemoryInputStream(const T(&buf)[N]) noexcept
Constructs and initializes MemoryInputStream.
The base class for input streams. This class cannot be instantiated.
Definition: InputStream.h:29
#define NLIB_NOEXCEPT
Defines noexcept geared to the environment, or the equivalent.
Definition: Config.h:105
#define NLIB_CEXPR
Defines constexpr if it is available for use. If not, holds an empty string.
Definition: Config.h:107
The class for creating an input stream that makes use of memory.
#define NLIB_FINAL
Defines final if it is available for use. If not, holds an empty string.
Definition: Config.h:245
errno_t Init(const T(&buf)[N]) noexcept
Initializes MemoryInputStream and makes it available for use.
unsigned char nlib_byte_t
This type will be defined as std::byte in a typedef of C++17 or later.
Definition: Platform.h:319
#define NLIB_NONNULL
Indicates that you cannot specify NULL for all arguments.
int errno_t
Indicates with an int-type typedef that a POSIX error value is returned as the return value...
Definition: NMalloc.h:37