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filesystemAsset_v1.h
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1 //
2 // Copyright 2021 Pixar
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4 // Licensed under the Apache License, Version 2.0 (the "Apache License")
5 // with the following modification; you may not use this file except in
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23 #ifndef INCLUDE_AR_FILESYSTEM_ASSET
24 #error This file should not be included directly. Include filesystemAsset.h instead.
25 #endif
26 
27 #ifndef PXR_USD_AR_FILESYSTEM_ASSET_V1_H
28 #define PXR_USD_AR_FILESYSTEM_ASSET_V1_H
29 
30 /// \file ar/filesystemAsset_v1.h
31 
32 #include "pxr/pxr.h"
33 #include "pxr/usd/ar/api.h"
34 #include "pxr/usd/ar/asset.h"
35 
36 #include <cstdio>
37 #include <memory>
38 #include <utility>
39 
41 
42 class ArResolvedPath;
43 
44 /// \class ArFilesystemAsset
45 ///
46 /// ArAsset implementation for asset represented by a file on a filesystem.
48  : public ArAsset
49 {
50 public:
51  /// Constructs a new ArFilesystemAsset for the file at \p resolvedPath.
52  /// Returns a null pointer if the file could not be opened.
53  AR_API
54  static std::shared_ptr<ArFilesystemAsset> Open(
55  const ArResolvedPath& resolvedPath);
56 
57  /// Constructs an ArFilesystemAsset for the given \p file.
58  /// The ArFilesystemAsset object takes ownership of \p file and will
59  /// close the file handle on destruction.
60  AR_API
61  explicit ArFilesystemAsset(FILE* file);
62 
63  /// Closes the file owned by this object.
64  AR_API
66 
67  /// Returns the size of the file held by this object.
68  AR_API
69  virtual size_t GetSize() override;
70 
71  /// Creates a read-only memory map for the file held by this object
72  /// and returns a pointer to the start of the mapped contents.
73  AR_API
74  virtual std::shared_ptr<const char> GetBuffer() override;
75 
76  /// Reads \p count bytes from the file held by this object at the
77  /// given \p offset into \p buffer.
78  AR_API
79  virtual size_t Read(void* buffer, size_t count, size_t offset) override;
80 
81  /// Returns the FILE* handle this object was created with and an offset
82  /// of 0, since the asset's contents are located at the beginning of the
83  /// file.
84  AR_API
85  virtual std::pair<FILE*, size_t> GetFileUnsafe() override;
86 
87 private:
88  FILE* _file;
89 };
90 
92 
93 #endif // PXR_USD_AR_FILESYSTEM_ASSET_V1_H
virtual AR_API size_t GetSize() override
Returns the size of the file held by this object.
virtual AR_API size_t Read(void *buffer, size_t count, size_t offset) override
static AR_API std::shared_ptr< ArFilesystemAsset > Open(const ArResolvedPath &resolvedPath)
#define AR_API
Definition: api.h:40
GLuint buffer
Definition: glcorearb.h:659
AR_API ArFilesystemAsset(FILE *file)
GLint GLsizei count
Definition: glcorearb.h:404
PXR_NAMESPACE_CLOSE_SCOPE PXR_NAMESPACE_OPEN_SCOPE
Definition: path.h:1375
virtual AR_API std::shared_ptr< const char > GetBuffer() override
virtual AR_API std::pair< FILE *, size_t > GetFileUnsafe() override
#define PXR_NAMESPACE_CLOSE_SCOPE
Definition: pxr.h:91
AR_API ~ArFilesystemAsset()
Closes the file owned by this object.
GLintptr offset
Definition: glcorearb.h:664