Revision 0:911b8403d557, committed 2011-12-25

Comitter:

AdamGreen

Date:

Sun Dec 25 01:31:16 2011 +0000

Commit message:

Changed in this revision

diff -r 000000000000 -r 911b8403d557 FakeFileSystem.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FakeFileSystem.cpp	Sun Dec 25 01:31:16 2011 +0000
@@ -0,0 +1,156 @@
+/* Copyright 2011 Adam Green (http://mbed.org/users/AdamGreen/)
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+/* Specifies the classes used to implement the FakeFileSystem which is a
+   read-only file system that exists in the internal Fake of the mbed
+   device.
+*/
+#include <mbed.h>
+#include <assert.h>
+#include "FakeFileSystem.h"
+
+
+FakeFileSystemFileHandle::FakeFileSystemFileHandle(size_t FileSize)
+{
+    SetEntry(FileSize);
+}
+
+FakeFileSystemFileHandle::FakeFileSystemFileHandle()
+{
+    SetEntry(0);
+}
+    
+ssize_t FakeFileSystemFileHandle::write(const void* pBuffer, size_t Length)
+{
+    // This file system doesn't support writing.
+    return -1;
+}
+
+
+int FakeFileSystemFileHandle::close()
+{
+    SetEntry(0);
+    
+    return 0;
+}
+
+ssize_t FakeFileSystemFileHandle::read(void* pBuffer, size_t Length)
+{
+    unsigned int    BytesLeft;
+
+    // Don't read more bytes than what are left in the file.
+    BytesLeft = m_Size - m_Offset;
+    if (Length > BytesLeft)
+    {
+        Length = BytesLeft;
+    }
+    
+    // Just leave buffer as is since we are just faking file reads.
+    
+    // Update the file pointer.
+    m_Offset += Length;
+    
+    return Length;
+}
+
+int FakeFileSystemFileHandle::isatty()
+{
+    return 0;
+}
+
+off_t FakeFileSystemFileHandle::lseek(off_t offset, int whence)
+{
+    switch(whence)
+    {
+    case SEEK_SET:
+        m_Offset = offset;
+        break;
+    case SEEK_CUR:
+        m_Offset += offset;
+        break;
+    case SEEK_END:
+        m_Offset = (m_Size - 1) + offset;
+        break;
+    default:
+        return -1;
+    }
+    
+    return m_Offset;
+}
+
+int FakeFileSystemFileHandle::fsync()
+{
+    return 0;
+}
+
+off_t FakeFileSystemFileHandle::flen()
+{
+    return m_Size;
+}
+
+
+
+
+FakeFileSystem::FakeFileSystem(const char* pName, size_t FakeFileSize) : FileSystemLike(pName)
+{
+    m_FakeFileSize = FakeFileSize;
+}
+
+FileHandle* FakeFileSystem::open(const char* pFilename, int Flags)
+{
+    // Can't find the file if file system hasn't been mounted.
+    if (!IsMounted())
+    {
+        return NULL;
+    }
+
+    // Can only open fake files for read.
+    if (O_RDONLY != Flags)
+    {
+        return NULL;
+    }
+    
+    // Attempt to find a free file handle.
+    FakeFileSystemFileHandle* pFileHandle = FindFreeFileHandle();
+    if (!pFileHandle)
+    {
+        return NULL;
+    }
+    
+    // Initialize the file handle and return it to caller.
+    pFileHandle->SetEntry(m_FakeFileSize);
+    return pFileHandle;
+}
+
+DirHandle*  FakeFileSystem::opendir(const char *pDirectoryName)
+{
+    return NULL;
+}
+
+FakeFileSystemFileHandle* FakeFileSystem::FindFreeFileHandle()
+{
+    size_t  i;
+    
+    // Iterate through the file handle array, looking for a close file handle.
+    for (i = 0 ; i < sizeof(m_FileHandles)/sizeof(m_FileHandles[0]) ; i++)
+    {
+        if (m_FileHandles[i].IsClosed())
+        {
+            return &(m_FileHandles[i]);
+        }
+    }
+    
+    // If we get here, then no free entries were found.
+    return NULL;
+}

diff -r 000000000000 -r 911b8403d557 FakeFileSystem.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FakeFileSystem.h	Sun Dec 25 01:31:16 2011 +0000
@@ -0,0 +1,86 @@
+/* Copyright 2011 Adam Green (http://mbed.org/users/AdamGreen/)
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+/* Specifies the classes used to implement the FakeFileSystem which is used by
+   the HTTPServer during performance testing to just simulate enough of a 
+   filesystem to just send a fixed amount of uninitialized data to the client.
+*/
+#ifndef _FAKEFILESYSTEM_H_
+#define _FAKEFILESYSTEM_H_
+
+#include "FileSystemLike.h"
+
+
+// Forward declare file system entry structure used internally in 
+// FakeFileSystem.
+struct _SFileSystemEntry;
+
+
+
+// Represents an opened file object in the FakeFileSystem.
+class FakeFileSystemFileHandle : public FileHandle 
+{
+public:
+    FakeFileSystemFileHandle();
+    FakeFileSystemFileHandle(size_t FileSize);
+    
+    // FileHandle interface methods.
+    virtual ssize_t write(const void* buffer, size_t length);
+    virtual int close();
+    virtual ssize_t read(void* buffer, size_t length);
+    virtual int isatty();
+    virtual off_t lseek(off_t offset, int whence);
+    virtual int fsync();
+    virtual off_t flen();
+
+    // Used by FakeFileSystem to maintain entries in its handle table.
+    void SetEntry(size_t FileSize)
+    {
+        m_Offset = 0;
+        m_Size = FileSize;
+    }
+    int IsClosed()
+    {
+        return (0 == m_Size);
+    }
+    
+protected:
+    // Current position in file to be updated by read and seek operations.
+    size_t              m_Offset;
+    // The simulated size of this fake file.
+    size_t              m_Size;
+};
+
+
+class FakeFileSystem : public FileSystemLike 
+{
+public:
+    FakeFileSystem(const char* pName, size_t FakeFileSize);
+    
+    virtual FileHandle* open(const char* pFilename, int Flags);
+    virtual DirHandle*  opendir(const char *pDirectoryName);
+
+    virtual int         IsMounted() { return 1; }
+
+protected:
+    FakeFileSystemFileHandle*  FindFreeFileHandle();
+    
+    // File handle table used by this file system so that it doesn't need
+    // to dynamically allocate file handles at runtime.
+    FakeFileSystemFileHandle   m_FileHandles[16];
+    
+    size_t                     m_FakeFileSize;
+};
+
+#endif // _FAKEFILESYSTEM_H_