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sdcardbytebuffer.cpp
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sdcardbytebuffer.cpp
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// This software is part of OpenMono, see http://developer.openmono.com
// Released under the MIT license, see LICENSE.txt
#include "sdcardbytebuffer.hpp"
#include <consoles.h>
#include "sdcard.hpp"
#define CHUNK_SIZE 0x100
SdCardByteBuffer::SdCardByteBuffer ()
:
_status(SdBuffer_NotInitialised),
bytesTotal(0)
{
}
SdCardByteBuffer::~SdCardByteBuffer ()
{
}
SdCardByteBuffer::Status SdCardByteBuffer::status () const
{
return _status;
}
void SdCardByteBuffer::attach (mono::String const & fileName)
{
path = SdCard::get().fullPath(fileName);
printf(String::Format("Opening %s\r\n",path())());
FILE * file = fopen(path(),"r");
if (0 == file)
{
printf(String::Format("Could not open %s\r\n",path())());
return clear();
}
fseek(file,0,SEEK_END);
bytesTotal = ftell(file);
printf("Bytes in file: %d\r\n",bytesTotal);
fclose(file);
_status = SdBuffer_OK;
}
void SdCardByteBuffer::addString (mono::String const & string)
{
add((uint8_t const *)string.stringData,string.Length());
}
void SdCardByteBuffer::add (uint8_t const * data, size_t length)
{
FILE * file = fopen(path(),"a");
if (0 == file)
{
_status = SdBuffer_FileNotWritable;
return;
}
size_t written = fwrite(data,1,length,file);
if (written != length)
{
_status = SdBuffer_FileSystemFull;
fclose(file);
return;
}
bytesTotal += written;
fclose(file);
}
size_t SdCardByteBuffer::bytes () const
{
return bytesTotal;
}
size_t SdCardByteBuffer::chunks () const
{
size_t count = bytes();
size_t chunks = count / CHUNK_SIZE;
if (chunks * CHUNK_SIZE < count) return chunks + 1;
return chunks;
}
size_t SdCardByteBuffer::chunkBytes (size_t index) const
{
size_t count = chunks();
if (index < (count-1)) return CHUNK_SIZE;
if (index >= count) return 0;
return bytes() % CHUNK_SIZE;
}
uint8_t SdCardByteBuffer::operator[] (size_t index) const
{
uint8_t buffer = 0;
FILE * file = fopen(path(),"r");
if (0 == file)
{
_status = SdBuffer_FileNotReadable;
return 0;
}
if (fseek(file,index,SEEK_SET) != 0)
{
fclose(file);
return 0;
}
fread(&buffer,1,1,file);
fclose(file);
return buffer;
}
uint8_t const * const SdCardByteBuffer::chunk (size_t index) const
{
static uint8_t buffer[CHUNK_SIZE];
FILE * file = fopen(path(),"r");
if (0 == file)
{
_status = SdBuffer_FileNotReadable;
return 0;
}
if (fseek(file,index*CHUNK_SIZE,SEEK_SET) != 0)
{
fclose(file);
return 0;
}
fread(&buffer,1,CHUNK_SIZE,file);
fclose(file);
return buffer;
}
void SdCardByteBuffer::clear ()
{
bytesTotal = 0;
SdCard::Status sdStatus = SdCard::get().mkdirForFullPath(path);
if (sdStatus != SdCard::SdCard_OK)
{
_status = SdBuffer_FileNotWritable;
return;
}
FILE * file = fopen(path(),"w");
if (0 == file)
{
_status = SdBuffer_FileNotWritable;
return;
}
_status = SdBuffer_OK;
fclose(file);
}