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microbit: Added MicroBitFile Object Oriented API

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master
Joe Finney 7 years ago
parent 89987a265a
commit 9c79ef729b
3 changed files with 513 additions and 0 deletions
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195
inc/drivers/MicroBitFile.h
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#ifndef MICROBIT_FILE_H
#define MICROBIT_FILE_H
#include "mbed.h"
#include "MicroBitConfig.h"
#include "MicroBitFileSystem.h"
#include "ManagedString.h"
#define READ MB_READ
#define WRITE MB_WRITE
#define READ_AND_WRITE READ | WRITE
#define CREATE MB_CREAT
class MicroBitFile
{
int fileHandle;
ManagedString fileName;
public:
/**
* Creates an instance of a MicroBitFile and creates a new file if required.
*
* @param fileName the name of the file to create/open.
*
* @param mode One of: READ, WRITE, READ_AND_WRITE. Defaults to READ_AND_WRITE.
*/
MicroBitFile(ManagedString fileName, int mode = READ_AND_WRITE);
/**
* Seeks to a position in this MicroBitFile instance from the beginning of the file.
*
* @param offset the number of bytes to seek, relative to the beginning of the file.
*
* @return the new seek position, MICROBIT_NOT_SUPPORTED if the current file handle is invalid,
* MICROBIT_INVALID_PARAMETER if the given offset is negative.
*/
int setPosition(int position);
/**
* Returns the current position of the seek head for the current file.
*
* @return the new seek position, MICROBIT_NOT_SUPPORTED if the current file handle is invalid.
*/
int getPosition();
/**
* Writes the given bytes to this MicroBitFile instance at the current position.
*
* @param bytes a pointer to the bytes to write to this file.
*
* @param len the number of bytes to write.
*
* @return The number of bytes written, MICROBIT_NOT_SUPPORTED if the current file
* handle is invalid, MICROBIT_INVALID_PARAMETER if bytes is invalid, or
* len is negative.
*/
int write(const char *bytes, int len);
/**
* Writes the given ManagedString to this MicroBitFile instance at the current position.
*
* @param s The ManagedString to write to this file.
*
* @return The number of bytes written, MICROBIT_NOT_SUPPORTED if the current file
* handle is invalid, MICROBIT_INVALID_PARAMETER if bytes is invalid, or
* len is negative.
*/
int write(ManagedString s);
/**
* Reads a single character from the file at the current position.
*
* @return the character, or MICROBIT_NOT_SUPPORTED if the current file handle
* is invalid.
*/
int read();
/**
* Reads from the file into a given buffer.
*
* @param buffer a pointer to the buffer where data will be stored.
*
* @param size the number of bytes that can be safely stored in the buffer.
*
* @return the number of bytes read, or MICROBIT_INVALID_PARAMETER if buffer is
* invalid, or the size given is less than 0.
*/
int read(char *buffer, int size);
/**
* Reads from the current MicroBitFile into a given buffer.
*
* @param size the number of bytes to be read from the file.
*
* @return a ManagedString containing the requested bytes, oran empty ManagedString
* on error.
*/
ManagedString read(int size);
/**
* Removes this MicroBitFile from the MicroBitFileSystem.
*
* @return MICROBIT_OK on success, MICROBIT_INVALID_PARAMETER if the given filename
* does not exist, MICROBIT_CANCELLED if something went wrong.
*/
int remove();
/**
* Seeks to the end of the file, and appends the given ManagedString to this MicroBitFile instance.
*
* @param bytes a pointer to the bytes to write to this file.
*
* @param len the number of bytes to write.
*
* @return The number of bytes written, MICROBIT_NOT_SUPPORTED if the current file
* handle is invalid or this file was not opened in WRITE mode.
*/
int append(const char *bytes, int len);
/**
* Seeks to the end of the file, and appends the given ManagedString to this MicroBitFile instance.
*
* @param s The ManagedString to write to this file.
*
* @return The number of bytes written, MICROBIT_NOT_SUPPORTED if the current file
* handle is invalid or this file was not opened in WRITE mode.
*/
int append(ManagedString s);
/**
* Seeks to the end of the file, and appends the given character to this MicroBitFile instance.
*
* @param c The character to write to this file.
*/
void operator+=(const char c);
/**
* Seeks to the end of the file, and appends the given sequence of characters to this MicroBitFile instance.
*
* @param s The sequence of characters to write to this file.
*
*/
void operator+=(const char* s);
/**
* Seeks to the end of the file, and appends the given ManagedString to this MicroBitFile instance.
*
* @param s The ManagedString to write to this file.
*
*/
void operator+=(ManagedString& s);
/**
* Returns the handle used by this MicroBitFile instance.
*
* @note This member function will also inform the user of any errors encountered
* during the opening of this MicroBitFile. At open, the handle is set
* to the return value from MicroBitFileSystem.open().
*/
int getHandle();
/**
* Opens this MicroBitFile instance if the file has previously been closed.
*
* @param mode One of: READ, WRITE, READ_AND_WRITE. Defaults to READ_AND_WRITE.
*
* @return MICROBIT_OK on success, MICROBIT_NOT_SUPPORTED if the file is already open,
* MICROBIT_INVALID_PARAMETER if the filename is too large, MICROBIT_NO_RESOURCES
* if the file system is full, or memory could not be allocated..
*
* @note MicroBitFiles are opened at construction and are implicitly closed at
* destruction. They can be closed explicitly using the close() member function.
*/
int open(int mode = READ_AND_WRITE);
/**
* Closes this MicroBitFile instance
*
* @return MICROBIT_OK on success, MICROBIT_NOT_SUPPORTED if the file handle
* is invalid.
*
* @note MicroBitFiles are opened at construction and are implicitly closed at
* destruction. They can be closed explicitly using this member function.
*/
int close();
/**
* Destructor for MicroBitFile. Implicitly closes the current file.
*/
~MicroBitFile();
};
#endif

1
source/CMakeLists.txt
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@ -42,6 +42,7 @@ set(YOTTA_AUTO_MICROBIT-DAL_CPP_FILES
"drivers/MicroBitThermometer.cpp"
"drivers/TimedInterruptIn.cpp"
"drivers/MicroBitFlash.cpp"
"drivers/MicroBitFile.cpp"
"drivers/MicroBitFileSystem.cpp"
"bluetooth/MicroBitAccelerometerService.cpp"

317
source/drivers/MicroBitFile.cpp
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#include "MicroBitFile.h"
#include "ErrorNo.h"
/**
* Creates an instance of a MicroBitFile and creates a new file if required.
*
* @param fileName the name of the file to create/open.
*
* @param mode One of: READ, WRITE, READ_AND_WRITE. Defaults to READ_AND_WRITE.
*/
MicroBitFile::MicroBitFile(ManagedString fileName, int mode)
{
this->fileName = fileName;
MicroBitFileSystem* fs;
if(MicroBitFileSystem::defaultFileSystem == NULL)
fs = new MicroBitFileSystem();
else
fs = MicroBitFileSystem::defaultFileSystem;
fileHandle = fs->open(fileName.toCharArray(), mode | CREATE);
}
/**
* Seeks to a position in this MicroBitFile instance from the beginning of the file.
*
* @param offset the number of bytes to seek, relative to the beginning of the file.
*
* @return the new seek position, MICROBIT_NOT_SUPPORTED if the current file handle is invalid,
* MICROBIT_INVALID_PARAMETER if the given offset is negative.
*/
int MicroBitFile::setPosition(int offset)
{
if(fileHandle < 0)
return MICROBIT_NOT_SUPPORTED;
if(offset < 0)
return MICROBIT_INVALID_PARAMETER;
return MicroBitFileSystem::defaultFileSystem->seek(fileHandle, offset, MB_SEEK_SET);
}
/**
* Returns the current position of the seek head for the current file.
*
* @return the new seek position, MICROBIT_NOT_SUPPORTED if the current file handle is invalid.
*/
int MicroBitFile::getPosition()
{
if(fileHandle < 0)
return MICROBIT_NOT_SUPPORTED;
return MicroBitFileSystem::defaultFileSystem->seek(fileHandle, 0, MB_SEEK_CUR);
}
/**
* Writes the given bytes to this MicroBitFile instance at the current position.
*
* @param bytes a pointer to the bytes to write to this file.
*
* @param len the number of bytes to write.
*
* @return The number of bytes written, MICROBIT_NOT_SUPPORTED if the current file
* handle is invalid, MICROBIT_INVALID_PARAMETER if bytes is invalid, or
* len is negative.
*/
int MicroBitFile::write(const char *bytes, int len)
{
if(fileHandle < 0)
return MICROBIT_NOT_SUPPORTED;
return MicroBitFileSystem::defaultFileSystem->write(fileHandle, (uint8_t*)bytes, len);
}
/**
* Writes the given ManagedString to this MicroBitFile instance at the current position.
*
* @param s The ManagedString to write to this file.
*
* @return The number of bytes written, MICROBIT_NOT_SUPPORTED if the current file
* handle is invalid, MICROBIT_INVALID_PARAMETER if bytes is invalid, or
* len is negative.
*/
int MicroBitFile::write(ManagedString s)
{
return write(s.toCharArray(), s.length());
}
/**
* Reads a single character from the file at the current position.
*
* @return the character, or MICROBIT_NOT_SUPPORTED if the current file handle
* is invalid.
*/
int MicroBitFile::read()
{
if(fileHandle < 0)
return MICROBIT_NOT_SUPPORTED;
char c[1];
int ret = read(c,1);
if(ret < 0)
return ret;
return c[0];
}
/**
* Reads from the file into a given buffer.
*
* @param buffer a pointer to the buffer where data will be stored.
*
* @param size the number of bytes that can be safely stored in the buffer.
*
* @return the number of bytes read, or MICROBIT_INVALID_PARAMETER if buffer is
* invalid, or the size given is less than 0.
*/
int MicroBitFile::read(char *buffer, int size)
{
if(fileHandle < 0)
return MICROBIT_NOT_SUPPORTED;
if(size < 0 || buffer == NULL)
return MICROBIT_INVALID_PARAMETER;
return MicroBitFileSystem::defaultFileSystem->read(fileHandle, (uint8_t*)buffer, size);
}
/**
* Reads from the current MicroBitFile into a given buffer.
*
* @param size the number of bytes to be read from the file.
*
* @return a ManagedString containing the requested bytes, oran empty ManagedString
* on error.
*/
ManagedString MicroBitFile::read(int size)
{
char buff[size + 1];
buff[size] = 0;
int ret = read(buff, size);
if(ret < 0)
return ManagedString();
return ManagedString(buff,ret);
}
/**
* Removes this MicroBitFile from the MicroBitFileSystem.
*
* @return MICROBIT_OK on success, MICROBIT_INVALID_PARAMETER if the given filename
* does not exist, MICROBIT_CANCELLED if something went wrong.
*/
int MicroBitFile::remove()
{
if(fileHandle < 0)
return MICROBIT_NOT_SUPPORTED;
int ret = MicroBitFileSystem::defaultFileSystem->remove(fileName.toCharArray());
if(ret < 0)
return ret;
fileHandle = MICROBIT_NOT_SUPPORTED;
return ret;
}
/**
* Seeks to the end of the file, and appends the given ManagedString to this MicroBitFile instance.
*
* @param bytes a pointer to the bytes to write to this file.
*
* @param len the number of bytes to write.
*
* @return The number of bytes written, MICROBIT_NOT_SUPPORTED if the current file
* handle is invalid or this file was not opened in WRITE mode.
*/
int MicroBitFile::append(const char *bytes, int len)
{
if(fileHandle < 0)
return MICROBIT_NOT_SUPPORTED;
int ret = MicroBitFileSystem::defaultFileSystem->seek(fileHandle, 0, MB_SEEK_END);
if(ret < 0)
return ret;
return write(bytes,len);
}
/**
* Seeks to the end of the file, and appends the given ManagedString to this MicroBitFile instance.
*
* @param s The ManagedString to write to this file.
*
* @return The number of bytes written, MICROBIT_NOT_SUPPORTED if the current file
* handle is invalid or this file was not opened in WRITE mode.
*/
int MicroBitFile::append(ManagedString s)
{
return append(s.toCharArray(), s.length());
}
/**
* Seeks to the end of the file, and appends the given character to this MicroBitFile instance.
*
* @param c The character to write to this file.
*/
void MicroBitFile::operator+=(const char c)
{
char s[1];
s[0] = c;
append(s, 1);
}
/**
* Seeks to the end of the file, and appends the given sequence of characters to this MicroBitFile instance.
*
* @param s The sequence of characters to write to this file.
*
*/
void MicroBitFile::operator+=(const char* s)
{
int len = strlen(s);
append(s, len);
}
/**
* Seeks to the end of the file, and appends the given ManagedString to this MicroBitFile instance.
*
* @param s The ManagedString to write to this file.
*
*/
void MicroBitFile::operator+=(ManagedString& s)
{
append(s);
}
/**
* Returns the handle used by this MicroBitFile instance.
*
* @note This member function will also inform the user of any errors encountered
* during the opening of this MicroBitFile. At open, the handle is set
* to the return value from MicroBitFileSystem.open().
*/
int MicroBitFile::getHandle()
{
return fileHandle;
}
/**
* Opens this MicroBitFile instance if the file has previously been closed.
*
* @param mode One of: READ, WRITE, READ_AND_WRITE. Defaults to READ_AND_WRITE.
*
* @return MICROBIT_OK on success, MICROBIT_NOT_SUPPORTED if the file is already open,
* MICROBIT_INVALID_PARAMETER if the filename is too large, MICROBIT_NO_RESOURCES
* if the file system is full, or memory could not be allocated..
*
* @note MicroBitFiles are opened at construction and are implicitly closed at
* destruction. They can be closed explicitly using the close() member function.
*/
int MicroBitFile::open(int mode)
{
if(fileHandle >= 0)
return MICROBIT_NOT_SUPPORTED;
int ret = MicroBitFileSystem::defaultFileSystem->open(fileName.toCharArray(), mode | CREATE);
if(ret < 0)
return ret;
fileHandle = ret;
return MICROBIT_OK;
}
/**
* Closes this MicroBitFile instance
*
* @return MICROBIT_OK on success, MICROBIT_NOT_SUPPORTED if the file handle
* is invalid.
*
* @note MicroBitFiles are opened at construction and are implicitly closed at
* destruction. They can be closed explicitly using this member function.
*/
int MicroBitFile::close()
{
if(fileHandle < 0)
return MICROBIT_NOT_SUPPORTED;
int ret = MicroBitFileSystem::defaultFileSystem->close(fileHandle);
if(ret < 0)
return ret;
fileHandle = MICROBIT_NO_RESOURCES;
return ret;
}
/**
* Destructor for MicroBitFile. Implicitly closes the current file.
*/
MicroBitFile::~MicroBitFile()
{
close();
}
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