mirror/JUCE
1
0
Fork 0
mirror of https://github.com/juce-framework/JUCE.git synced 2026-01-11 23:54:18 +00:00
Code Activity

New class: MemoryMappedFile.

Browse source
This commit is contained in:
Julian Storer 2011-05-12 21:28:05 +01:00
parent 981ef9313c
commit 3213bec481
23 changed files with 556 additions and 66 deletions
Download patch file Download diff file Expand all files Collapse all files

2
Builds/MacOSX/Juce.xcodeproj/project.pbxproj
View file

@ -898,6 +898,7 @@
4EEF0B0BB4C3D1956B04122B = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = juce_FileOutputStream.h; path = ../../src/io/files/juce_FileOutputStream.h; sourceTree = SOURCE_ROOT; };
59B2FFF817679AEA84375E1B = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = juce_FileSearchPath.cpp; path = ../../src/io/files/juce_FileSearchPath.cpp; sourceTree = SOURCE_ROOT; };
49BF2B02A6D7B4438FC24839 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = juce_FileSearchPath.h; path = ../../src/io/files/juce_FileSearchPath.h; sourceTree = SOURCE_ROOT; };
00B348FA35A7F691AEF84FBA = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = juce_MemoryMappedFile.h; path = ../../src/io/files/juce_MemoryMappedFile.h; sourceTree = SOURCE_ROOT; };
D9B3C04F8EB4228DD59002E7 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = juce_NamedPipe.cpp; path = ../../src/io/files/juce_NamedPipe.cpp; sourceTree = SOURCE_ROOT; };
42DA88264F768BAACD0414A3 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = juce_NamedPipe.h; path = ../../src/io/files/juce_NamedPipe.h; sourceTree = SOURCE_ROOT; };
17C3AF03FF7AE88AE0C73311 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = juce_TemporaryFile.cpp; path = ../../src/io/files/juce_TemporaryFile.cpp; sourceTree = SOURCE_ROOT; };
@ -1713,6 +1714,7 @@
4EEF0B0BB4C3D1956B04122B,
59B2FFF817679AEA84375E1B,
49BF2B02A6D7B4438FC24839,
00B348FA35A7F691AEF84FBA,
D9B3C04F8EB4228DD59002E7,
42DA88264F768BAACD0414A3,
17C3AF03FF7AE88AE0C73311,

1
Builds/VisualStudio2005/Juce.vcproj
View file

@ -787,6 +787,7 @@
<File RelativePath="..\..\src\io\files\juce_FileOutputStream.h"/>
<File RelativePath="..\..\src\io\files\juce_FileSearchPath.cpp"/>
<File RelativePath="..\..\src\io\files\juce_FileSearchPath.h"/>
<File RelativePath="..\..\src\io\files\juce_MemoryMappedFile.h"/>
<File RelativePath="..\..\src\io\files\juce_NamedPipe.cpp"/>
<File RelativePath="..\..\src\io\files\juce_NamedPipe.h"/>
<File RelativePath="..\..\src\io\files\juce_TemporaryFile.cpp"/>

1
Builds/VisualStudio2008/Juce.vcproj
View file

@ -787,6 +787,7 @@
<File RelativePath="..\..\src\io\files\juce_FileOutputStream.h"/>
<File RelativePath="..\..\src\io\files\juce_FileSearchPath.cpp"/>
<File RelativePath="..\..\src\io\files\juce_FileSearchPath.h"/>
<File RelativePath="..\..\src\io\files\juce_MemoryMappedFile.h"/>
<File RelativePath="..\..\src\io\files\juce_NamedPipe.cpp"/>
<File RelativePath="..\..\src\io\files\juce_NamedPipe.h"/>
<File RelativePath="..\..\src\io\files\juce_TemporaryFile.cpp"/>

1
Builds/VisualStudio2008_DLL/Juce.vcproj
View file

@ -789,6 +789,7 @@
<File RelativePath="..\..\src\io\files\juce_FileOutputStream.h"/>
<File RelativePath="..\..\src\io\files\juce_FileSearchPath.cpp"/>
<File RelativePath="..\..\src\io\files\juce_FileSearchPath.h"/>
<File RelativePath="..\..\src\io\files\juce_MemoryMappedFile.h"/>
<File RelativePath="..\..\src\io\files\juce_NamedPipe.cpp"/>
<File RelativePath="..\..\src\io\files\juce_NamedPipe.h"/>
<File RelativePath="..\..\src\io\files\juce_TemporaryFile.cpp"/>

1
Builds/VisualStudio2010/Juce.vcxproj
View file

@ -741,6 +741,7 @@
<ClInclude Include="..\..\src\io\files\juce_FileInputStream.h"/>
<ClInclude Include="..\..\src\io\files\juce_FileOutputStream.h"/>
<ClInclude Include="..\..\src\io\files\juce_FileSearchPath.h"/>
<ClInclude Include="..\..\src\io\files\juce_MemoryMappedFile.h"/>
<ClInclude Include="..\..\src\io\files\juce_NamedPipe.h"/>
<ClInclude Include="..\..\src\io\files\juce_TemporaryFile.h"/>
<ClInclude Include="..\..\src\io\files\juce_ZipFile.h"/>

3
Builds/VisualStudio2010/Juce.vcxproj.filters
View file

@ -2154,6 +2154,9 @@
<ClInclude Include="..\..\src\io\files\juce_FileSearchPath.h">
<Filter>Juce\Source\io\files</Filter>
</ClInclude>
<ClInclude Include="..\..\src\io\files\juce_MemoryMappedFile.h">
<Filter>Juce\Source\io\files</Filter>
</ClInclude>
<ClInclude Include="..\..\src\io\files\juce_NamedPipe.h">
<Filter>Juce\Source\io\files</Filter>
</ClInclude>

2
Builds/iOS/Juce.xcodeproj/project.pbxproj
View file

@ -898,6 +898,7 @@
4EEF0B0BB4C3D1956B04122B = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = juce_FileOutputStream.h; path = ../../src/io/files/juce_FileOutputStream.h; sourceTree = SOURCE_ROOT; };
59B2FFF817679AEA84375E1B = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = juce_FileSearchPath.cpp; path = ../../src/io/files/juce_FileSearchPath.cpp; sourceTree = SOURCE_ROOT; };
49BF2B02A6D7B4438FC24839 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = juce_FileSearchPath.h; path = ../../src/io/files/juce_FileSearchPath.h; sourceTree = SOURCE_ROOT; };
00B348FA35A7F691AEF84FBA = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = juce_MemoryMappedFile.h; path = ../../src/io/files/juce_MemoryMappedFile.h; sourceTree = SOURCE_ROOT; };
D9B3C04F8EB4228DD59002E7 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = juce_NamedPipe.cpp; path = ../../src/io/files/juce_NamedPipe.cpp; sourceTree = SOURCE_ROOT; };
42DA88264F768BAACD0414A3 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = juce_NamedPipe.h; path = ../../src/io/files/juce_NamedPipe.h; sourceTree = SOURCE_ROOT; };
17C3AF03FF7AE88AE0C73311 = { isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = juce_TemporaryFile.cpp; path = ../../src/io/files/juce_TemporaryFile.cpp; sourceTree = SOURCE_ROOT; };
@ -1713,6 +1714,7 @@
4EEF0B0BB4C3D1956B04122B,
59B2FFF817679AEA84375E1B,
49BF2B02A6D7B4438FC24839,
00B348FA35A7F691AEF84FBA,
D9B3C04F8EB4228DD59002E7,
42DA88264F768BAACD0414A3,
17C3AF03FF7AE88AE0C73311,

2
Juce.jucer
View file

@ -1177,6 +1177,8 @@
file="src/io/files/juce_FileSearchPath.cpp"/>
<FILE id="YJYo7slcr" name="juce_FileSearchPath.h" compile="0" resource="0"
file="src/io/files/juce_FileSearchPath.h"/>
<FILE id="gPKPMY" name="juce_MemoryMappedFile.h" compile="0" resource="0"
file="src/io/files/juce_MemoryMappedFile.h"/>
<FILE id="hwijIMGzE" name="juce_NamedPipe.cpp" compile="1" resource="0"
file="src/io/files/juce_NamedPipe.cpp"/>
<FILE id="Jv4ugNwIx" name="juce_NamedPipe.h" compile="0" resource="0"

264
juce_amalgamated.cpp
View file

@ -773,6 +773,7 @@ protected:
#include <sys/ptrace.h>
#include <sys/vfs.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <fnmatch.h>
#include <utime.h>
#include <pwd.h>
@ -922,6 +923,7 @@ protected:
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/utsname.h>
#include <sys/mman.h>
#include <fnmatch.h>
#include <utime.h>
#include <dlfcn.h>
@ -961,6 +963,7 @@ protected:
#include <sys/statfs.h>
#include <sys/ptrace.h>
#include <sys/sysinfo.h>
#include <sys/mman.h>
#include <pwd.h>
#include <dirent.h>
#include <fnmatch.h>
@ -7857,53 +7860,48 @@ bool File::isAbsolutePath (const String& path)
const File File::getChildFile (String relativePath) const
{
if (isAbsolutePath (relativePath))
{
// the path is really absolute..
return File (relativePath);
}
else
String path (fullPath);
// It's relative, so remove any ../ or ./ bits at the start..
if (relativePath[0] == '.')
{
// it's relative, so remove any ../ or ./ bits at the start.
String path (fullPath);
#if JUCE_WINDOWS
relativePath = relativePath.replaceCharacter ('/', '\\').trimStart();
#else
relativePath = relativePath.trimStart();
#endif
if (relativePath[0] == '.')
while (relativePath[0] == '.')
{
#if JUCE_WINDOWS
relativePath = relativePath.replaceCharacter ('/', '\\').trimStart();
#else
relativePath = relativePath.trimStart();
#endif
while (relativePath[0] == '.')
if (relativePath[1] == '.')
{
if (relativePath[1] == '.')
if (relativePath [2] == 0 || relativePath[2] == separator)
{
if (relativePath [2] == 0 || relativePath[2] == separator)
{
const int lastSlash = path.lastIndexOfChar (separator);
if (lastSlash >= 0)
path = path.substring (0, lastSlash);
const int lastSlash = path.lastIndexOfChar (separator);
if (lastSlash >= 0)
path = path.substring (0, lastSlash);
relativePath = relativePath.substring (3);
}
else
{
break;
}
}
else if (relativePath[1] == separator)
{
relativePath = relativePath.substring (2);
relativePath = relativePath.substring (3);
}
else
{
break;
}
}
else if (relativePath[1] == separator)
{
relativePath = relativePath.substring (2);
}
else
{
break;
}
}
return File (addTrailingSeparator (path) + relativePath);
}
return File (addTrailingSeparator (path) + relativePath);
}
const File File::getSiblingFile (const String& fileName) const
@ -8481,6 +8479,39 @@ public:
expect (mb[0] == '0');
}
beginTest ("Memory-mapped files");
{
MemoryMappedFile mmf (tempFile, MemoryMappedFile::readOnly);
expect (mmf.getSize() == 10);
expect (mmf.getData() != nullptr);
expect (memcmp (mmf.getData(), "0123456789", 10) == 0);
}
{
const File tempFile2 (tempFile.getNonexistentSibling (false));
expect (tempFile2.create());
expect (tempFile2.appendData ("xxxxxxxxxx", 10));
{
MemoryMappedFile mmf (tempFile2, MemoryMappedFile::readWrite);
expect (mmf.getSize() == 10);
expect (mmf.getData() != nullptr);
memcpy (mmf.getData(), "abcdefghij", 10);
}
{
MemoryMappedFile mmf (tempFile2, MemoryMappedFile::readWrite);
expect (mmf.getSize() == 10);
expect (mmf.getData() != nullptr);
expect (memcmp (mmf.getData(), "abcdefghij", 10) == 0);
}
expect (tempFile2.deleteFile());
}
beginTest ("More writing");
expect (tempFile.appendData ("abcdefghij", 10));
expect (tempFile.getSize() == 20);
expect (tempFile.replaceWithData ("abcdefghij", 10));
@ -244800,6 +244831,55 @@ void FileOutputStream::flushInternal()
status = WindowsFileHelpers::getResultForLastError();
}
MemoryMappedFile::MemoryMappedFile (const File& file, MemoryMappedFile::AccessMode mode)
: address (nullptr),
internal (nullptr),
length (0)
{
jassert (mode == readOnly || mode == readWrite);
DWORD accessMode = GENERIC_READ, shareMode = FILE_SHARE_READ, createType = OPEN_EXISTING;
DWORD protect = PAGE_READONLY, access = FILE_MAP_READ;
if (mode == readWrite)
{
accessMode = GENERIC_READ | GENERIC_WRITE;
createType = OPEN_ALWAYS;
protect = PAGE_READWRITE;
access = FILE_MAP_ALL_ACCESS;
}
HANDLE h = CreateFile (file.getFullPathName().toWideCharPointer(), accessMode, FILE_SHARE_READ, 0,
createType, FILE_ATTRIBUTE_NORMAL, 0);
internal = (void*) h;
if (h != INVALID_HANDLE_VALUE)
{
const int64 fileSize = file.getSize();
HANDLE mappingHandle = CreateFileMapping (h, 0, protect, (DWORD) (fileSize >> 32), (DWORD) fileSize, 0);
if (mappingHandle != 0)
{
address = MapViewOfFile (mappingHandle, access, 0, 0, (SIZE_T) fileSize);
if (address != nullptr)
length = (size_t) fileSize;
CloseHandle (mappingHandle);
}
}
}
MemoryMappedFile::~MemoryMappedFile()
{
if (address != nullptr)
UnmapViewOfFile (address);
if (internal != nullptr)
CloseHandle ((HANDLE) internal);
}
int64 File::getSize() const
{
WIN32_FILE_ATTRIBUTE_DATA attributes;
@ -260588,6 +260668,46 @@ void FileOutputStream::flushInternal()
status = getResultForErrno();
}
MemoryMappedFile::MemoryMappedFile (const File& file, MemoryMappedFile::AccessMode mode)
: address (nullptr),
internal (nullptr),
length (0)
{
jassert (mode == readOnly || mode == readWrite);
const int fd = open (file.getFullPathName().toUTF8(),
mode == readWrite ? (O_CREAT + O_RDWR) : O_RDONLY, 00644);
internal = reinterpret_cast<void*> (fd);
if (fd != -1)
{
const int64 fileSize = file.getSize();
address = mmap (0, (size_t) fileSize,
mode == readWrite ? (PROT_READ | PROT_WRITE) : PROT_READ,
MAP_SHARED, fd, 0);
if (address == MAP_FAILED)
address = nullptr;
else
length = (size_t) fileSize;
}
}
MemoryMappedFile::~MemoryMappedFile()
{
const int fd = reinterpret_cast <int> (internal);
if (fd != 0)
{
if (address != nullptr)
munmap (address, length);
close (fd);
}
}
const File juce_getExecutableFile()
{
#if JUCE_ANDROID
@ -270579,6 +270699,46 @@ void FileOutputStream::flushInternal()
status = getResultForErrno();
}
MemoryMappedFile::MemoryMappedFile (const File& file, MemoryMappedFile::AccessMode mode)
: address (nullptr),
internal (nullptr),
length (0)
{
jassert (mode == readOnly || mode == readWrite);
const int fd = open (file.getFullPathName().toUTF8(),
mode == readWrite ? (O_CREAT + O_RDWR) : O_RDONLY, 00644);
internal = reinterpret_cast<void*> (fd);
if (fd != -1)
{
const int64 fileSize = file.getSize();
address = mmap (0, (size_t) fileSize,
mode == readWrite ? (PROT_READ | PROT_WRITE) : PROT_READ,
MAP_SHARED, fd, 0);
if (address == MAP_FAILED)
address = nullptr;
else
length = (size_t) fileSize;
}
}
MemoryMappedFile::~MemoryMappedFile()
{
const int fd = reinterpret_cast <int> (internal);
if (fd != 0)
{
if (address != nullptr)
munmap (address, length);
close (fd);
}
}
const File juce_getExecutableFile()
{
#if JUCE_ANDROID
@ -287465,6 +287625,46 @@ void FileOutputStream::flushInternal()
status = getResultForErrno();
}
MemoryMappedFile::MemoryMappedFile (const File& file, MemoryMappedFile::AccessMode mode)
: address (nullptr),
internal (nullptr),
length (0)
{
jassert (mode == readOnly || mode == readWrite);
const int fd = open (file.getFullPathName().toUTF8(),
mode == readWrite ? (O_CREAT + O_RDWR) : O_RDONLY, 00644);
internal = reinterpret_cast<void*> (fd);
if (fd != -1)
{
const int64 fileSize = file.getSize();
address = mmap (0, (size_t) fileSize,
mode == readWrite ? (PROT_READ | PROT_WRITE) : PROT_READ,
MAP_SHARED, fd, 0);
if (address == MAP_FAILED)
address = nullptr;
else
length = (size_t) fileSize;
}
}
MemoryMappedFile::~MemoryMappedFile()
{
const int fd = reinterpret_cast <int> (internal);
if (fd != 0)
{
if (address != nullptr)
munmap (address, length);
close (fd);
}
}
const File juce_getExecutableFile()
{
#if JUCE_ANDROID

64
juce_amalgamated.h
View file

@ -73,7 +73,7 @@ namespace JuceDummyNamespace {}
*/
#define JUCE_MAJOR_VERSION 1
#define JUCE_MINOR_VERSION 53
#define JUCE_BUILDNUMBER 88
#define JUCE_BUILDNUMBER 89
/** Current Juce version number.
@ -19409,6 +19409,68 @@ private:
/*** End of inlined file: juce_FileSearchPath.h ***/
#endif
#ifndef __JUCE_MEMORYMAPPEDFILE_JUCEHEADER__
/*** Start of inlined file: juce_MemoryMappedFile.h ***/
#ifndef __JUCE_MEMORYMAPPEDFILE_JUCEHEADER__
#define __JUCE_MEMORYMAPPEDFILE_JUCEHEADER__
/**
Maps a file into virtual memory for easy reading and/or writing.
*/
class JUCE_API MemoryMappedFile
{
public:
/** The read/write flags used when opening a memory mapped file. */
enum AccessMode
{
readOnly, /**< Indicates that the memory can only be read. */
readWrite /**< Indicates that the memory can be read and written to - changes that are
made will be flushed back to disk at the whim of the OS. */
};
/** Opens a file and maps it to an area of virtual memory.
The file should already exist, and should already be the size that you want to work with
when you call this. If the file is resized after being opened, the behaviour is undefined.
If the file exists and the operation succeeds, the getData() and getSize() methods will
return the location and size of the data that can be read or written. Note that the entire
file is not read into memory immediately - the OS simply creates a virtual mapping, which
will lazily pull the data into memory when blocks are accessed.
If the file can't be opened for some reason, the getData() method will return a null pointer.
*/
MemoryMappedFile (const File& file, AccessMode mode);
/** Destructor. */
~MemoryMappedFile();
/** Returns the address at which this file has been mapped, or a null pointer if
the file couldn't be successfully mapped.
*/
void* getData() const noexcept { return address; }
/** Returns the number of bytes of data that are available for reading or writing.
This will normally be the size of the file.
*/
size_t getSize() const noexcept { return length; }
private:
void* address;
void* internal;
size_t length;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MemoryMappedFile);
};
#endif // __JUCE_MEMORYMAPPEDFILE_JUCEHEADER__
/*** End of inlined file: juce_MemoryMappedFile.h ***/
#endif
#ifndef __JUCE_NAMEDPIPE_JUCEHEADER__

2
src/core/juce_StandardHeader.h
View file

@ -33,7 +33,7 @@
*/
#define JUCE_MAJOR_VERSION 1
#define JUCE_MINOR_VERSION 53
#define JUCE_BUILDNUMBER 88
#define JUCE_BUILDNUMBER 89
/** Current Juce version number.

94
src/io/files/juce_File.cpp
View file

@ -380,53 +380,48 @@ bool File::isAbsolutePath (const String& path)
const File File::getChildFile (String relativePath) const
{
if (isAbsolutePath (relativePath))
{
// the path is really absolute..
return File (relativePath);
}
else
String path (fullPath);
// It's relative, so remove any ../ or ./ bits at the start..
if (relativePath[0] == '.')
{
// it's relative, so remove any ../ or ./ bits at the start.
String path (fullPath);
#if JUCE_WINDOWS
relativePath = relativePath.replaceCharacter ('/', '\\').trimStart();
#else
relativePath = relativePath.trimStart();
#endif
if (relativePath[0] == '.')
while (relativePath[0] == '.')
{
#if JUCE_WINDOWS
relativePath = relativePath.replaceCharacter ('/', '\\').trimStart();
#else
relativePath = relativePath.trimStart();
#endif
while (relativePath[0] == '.')
if (relativePath[1] == '.')
{
if (relativePath[1] == '.')
if (relativePath [2] == 0 || relativePath[2] == separator)
{
if (relativePath [2] == 0 || relativePath[2] == separator)
{
const int lastSlash = path.lastIndexOfChar (separator);
if (lastSlash >= 0)
path = path.substring (0, lastSlash);
const int lastSlash = path.lastIndexOfChar (separator);
if (lastSlash >= 0)
path = path.substring (0, lastSlash);
relativePath = relativePath.substring (3);
}
else
{
break;
}
}
else if (relativePath[1] == separator)
{
relativePath = relativePath.substring (2);
relativePath = relativePath.substring (3);
}
else
{
break;
}
}
else if (relativePath[1] == separator)
{
relativePath = relativePath.substring (2);
}
else
{
break;
}
}
return File (addTrailingSeparator (path) + relativePath);
}
return File (addTrailingSeparator (path) + relativePath);
}
const File File::getSiblingFile (const String& fileName) const
@ -904,6 +899,8 @@ const File File::createTempFile (const String& fileNameEnding)
#include "../../utilities/juce_UnitTest.h"
#include "../../maths/juce_Random.h"
#include "juce_MemoryMappedFile.h"
class FileTests : public UnitTest
{
@ -1022,6 +1019,39 @@ public:
expect (mb[0] == '0');
}
beginTest ("Memory-mapped files");
{
MemoryMappedFile mmf (tempFile, MemoryMappedFile::readOnly);
expect (mmf.getSize() == 10);
expect (mmf.getData() != nullptr);
expect (memcmp (mmf.getData(), "0123456789", 10) == 0);
}
{
const File tempFile2 (tempFile.getNonexistentSibling (false));
expect (tempFile2.create());
expect (tempFile2.appendData ("xxxxxxxxxx", 10));
{
MemoryMappedFile mmf (tempFile2, MemoryMappedFile::readWrite);
expect (mmf.getSize() == 10);
expect (mmf.getData() != nullptr);
memcpy (mmf.getData(), "abcdefghij", 10);
}
{
MemoryMappedFile mmf (tempFile2, MemoryMappedFile::readWrite);
expect (mmf.getSize() == 10);
expect (mmf.getData() != nullptr);
expect (memcmp (mmf.getData(), "abcdefghij", 10) == 0);
}
expect (tempFile2.deleteFile());
}
beginTest ("More writing");
expect (tempFile.appendData ("abcdefghij", 10));
expect (tempFile.getSize() == 20);
expect (tempFile.replaceWithData ("abcdefghij", 10));

84
src/io/files/juce_MemoryMappedFile.h Normal file
View file

@ -0,0 +1,84 @@
/*
==============================================================================
This file is part of the JUCE library - "Jules' Utility Class Extensions"
Copyright 2004-11 by Raw Material Software Ltd.
------------------------------------------------------------------------------
JUCE can be redistributed and/or modified under the terms of the GNU General
Public License (Version 2), as published by the Free Software Foundation.
A copy of the license is included in the JUCE distribution, or can be found
online at www.gnu.org/licenses.
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.rawmaterialsoftware.com/juce for more information.
==============================================================================
*/
#ifndef __JUCE_MEMORYMAPPEDFILE_JUCEHEADER__
#define __JUCE_MEMORYMAPPEDFILE_JUCEHEADER__
#include "juce_File.h"
//==============================================================================
/**
Maps a file into virtual memory for easy reading and/or writing.
*/
class JUCE_API MemoryMappedFile
{
public:
/** The read/write flags used when opening a memory mapped file. */
enum AccessMode
{
readOnly, /**< Indicates that the memory can only be read. */
readWrite /**< Indicates that the memory can be read and written to - changes that are
made will be flushed back to disk at the whim of the OS. */
};
/** Opens a file and maps it to an area of virtual memory.
The file should already exist, and should already be the size that you want to work with
when you call this. If the file is resized after being opened, the behaviour is undefined.
If the file exists and the operation succeeds, the getData() and getSize() methods will
return the location and size of the data that can be read or written. Note that the entire
file is not read into memory immediately - the OS simply creates a virtual mapping, which
will lazily pull the data into memory when blocks are accessed.
If the file can't be opened for some reason, the getData() method will return a null pointer.
*/
MemoryMappedFile (const File& file, AccessMode mode);
/** Destructor. */
~MemoryMappedFile();
/** Returns the address at which this file has been mapped, or a null pointer if
the file couldn't be successfully mapped.
*/
void* getData() const noexcept { return address; }
/** Returns the number of bytes of data that are available for reading or writing.
This will normally be the size of the file.
*/
size_t getSize() const noexcept { return length; }
private:
//==============================================================================
void* address;
void* internal;
size_t length;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MemoryMappedFile);
};
#endif // __JUCE_MEMORYMAPPEDFILE_JUCEHEADER__

3
src/juce_core_includes.h
View file

@ -146,6 +146,9 @@
#ifndef __JUCE_FILESEARCHPATH_JUCEHEADER__
#include "io/files/juce_FileSearchPath.h"
#endif
#ifndef __JUCE_MEMORYMAPPEDFILE_JUCEHEADER__
#include "io/files/juce_MemoryMappedFile.h"
#endif
#ifndef __JUCE_NAMEDPIPE_JUCEHEADER__
#include "io/files/juce_NamedPipe.h"
#endif

1
src/native/android/juce_android_NativeCode.cpp
View file

@ -53,6 +53,7 @@ BEGIN_JUCE_NAMESPACE
#include "../../io/files/juce_FileOutputStream.h"
#include "../../io/files/juce_NamedPipe.h"
#include "../../io/files/juce_DirectoryIterator.h"
#include "../../io/files/juce_MemoryMappedFile.h"
#include "../../io/network/juce_URL.h"
#include "../../io/network/juce_MACAddress.h"
#include "../../core/juce_PlatformUtilities.h"

1
src/native/android/juce_android_NativeIncludes.h
View file

@ -43,6 +43,7 @@
#include <sys/statfs.h>
#include <sys/ptrace.h>
#include <sys/sysinfo.h>
#include <sys/mman.h>
#include <pwd.h>
#include <dirent.h>
#include <fnmatch.h>

41
src/native/common/juce_posix_SharedCode.h
View file

@ -523,6 +523,47 @@ void FileOutputStream::flushInternal()
status = getResultForErrno();
}
//==============================================================================
MemoryMappedFile::MemoryMappedFile (const File& file, MemoryMappedFile::AccessMode mode)
: address (nullptr),
internal (nullptr),
length (0)
{
jassert (mode == readOnly || mode == readWrite);
const int fd = open (file.getFullPathName().toUTF8(),
mode == readWrite ? (O_CREAT + O_RDWR) : O_RDONLY, 00644);
internal = reinterpret_cast<void*> (fd);
if (fd != -1)
{
const int64 fileSize = file.getSize();
address = mmap (0, (size_t) fileSize,
mode == readWrite ? (PROT_READ | PROT_WRITE) : PROT_READ,
MAP_SHARED, fd, 0);
if (address == MAP_FAILED)
address = nullptr;
else
length = (size_t) fileSize;
}
}
MemoryMappedFile::~MemoryMappedFile()
{
const int fd = reinterpret_cast <int> (internal);
if (fd != 0)
{
if (address != nullptr)
munmap (address, length);
close (fd);
}
}
//==============================================================================
const File juce_getExecutableFile()
{

1
src/native/linux/juce_linux_NativeCode.cpp
View file

@ -64,6 +64,7 @@ BEGIN_JUCE_NAMESPACE
#include "../../io/files/juce_FileInputStream.h"
#include "../../io/files/juce_FileOutputStream.h"
#include "../../io/files/juce_DirectoryIterator.h"
#include "../../io/files/juce_MemoryMappedFile.h"
#include "../../io/network/juce_URL.h"
#include "../../io/network/juce_MACAddress.h"
#include "../../io/streams/juce_MemoryInputStream.h"

1
src/native/linux/juce_linux_NativeIncludes.h
View file

@ -42,6 +42,7 @@
#include <sys/ptrace.h>
#include <sys/vfs.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <fnmatch.h>
#include <utime.h>
#include <pwd.h>

1
src/native/mac/juce_mac_NativeCode.mm
View file

@ -53,6 +53,7 @@ BEGIN_JUCE_NAMESPACE
#include "../../io/files/juce_FileOutputStream.h"
#include "../../io/files/juce_NamedPipe.h"
#include "../../io/files/juce_DirectoryIterator.h"
#include "../../io/files/juce_MemoryMappedFile.h"
#include "../../io/network/juce_URL.h"
#include "../../io/network/juce_MACAddress.h"
#include "../../io/streams/juce_MemoryInputStream.h"

1
src/native/mac/juce_mac_NativeIncludes.h
View file

@ -70,6 +70,7 @@
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/utsname.h>
#include <sys/mman.h>
#include <fnmatch.h>
#include <utime.h>
#include <dlfcn.h>

50
src/native/windows/juce_win32_Files.cpp
View file

@ -299,6 +299,56 @@ void FileOutputStream::flushInternal()
status = WindowsFileHelpers::getResultForLastError();
}
//==============================================================================
MemoryMappedFile::MemoryMappedFile (const File& file, MemoryMappedFile::AccessMode mode)
: address (nullptr),
internal (nullptr),
length (0)
{
jassert (mode == readOnly || mode == readWrite);
DWORD accessMode = GENERIC_READ, shareMode = FILE_SHARE_READ, createType = OPEN_EXISTING;
DWORD protect = PAGE_READONLY, access = FILE_MAP_READ;
if (mode == readWrite)
{
accessMode = GENERIC_READ | GENERIC_WRITE;
createType = OPEN_ALWAYS;
protect = PAGE_READWRITE;
access = FILE_MAP_ALL_ACCESS;
}
HANDLE h = CreateFile (file.getFullPathName().toWideCharPointer(), accessMode, FILE_SHARE_READ, 0,
createType, FILE_ATTRIBUTE_NORMAL, 0);
internal = (void*) h;
if (h != INVALID_HANDLE_VALUE)
{
const int64 fileSize = file.getSize();
HANDLE mappingHandle = CreateFileMapping (h, 0, protect, (DWORD) (fileSize >> 32), (DWORD) fileSize, 0);
if (mappingHandle != 0)
{
address = MapViewOfFile (mappingHandle, access, 0, 0, (SIZE_T) fileSize);
if (address != nullptr)
length = (size_t) fileSize;
CloseHandle (mappingHandle);
}
}
}
MemoryMappedFile::~MemoryMappedFile()
{
if (address != nullptr)
UnmapViewOfFile (address);
if (internal != nullptr)
CloseHandle ((HANDLE) internal);
}
//==============================================================================
int64 File::getSize() const
{

1
src/native/windows/juce_win32_NativeCode.cpp
View file

@ -54,6 +54,7 @@ BEGIN_JUCE_NAMESPACE
#include "../../io/streams/juce_MemoryOutputStream.h"
#include "../../io/files/juce_NamedPipe.h"
#include "../../io/files/juce_DirectoryIterator.h"
#include "../../io/files/juce_MemoryMappedFile.h"
#include "../../io/network/juce_URL.h"
#include "../../io/network/juce_MACAddress.h"
#include "../../core/juce_PlatformUtilities.h"