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/*******************************************************************//**
*
* \file IO.c
*
* \author Xavier Del Campo
*
* \brief Implementation of IO module.
*
************************************************************************/
/* *************************************
* Includes
* *************************************/
#include "IO.h"
#include "Interrupts.h"
#include "Gfx.h"
#include "Serial.h"
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
/* *************************************
* Defines
* *************************************/
enum
{
FILE_BUFFER_SIZE = 182 << 10
};
/* *************************************
* Types definition
* *************************************/
/* *************************************
* Global variables definition
* *************************************/
/* *************************************
* Local variables definition
* *************************************/
/* *************************************
* Local prototypes declaration
* *************************************/
/* *************************************
* Functions definition
* *************************************/
#ifndef SERIAL_INTERFACE
static const uint8_t *IOLoadFileFromCd(char* const buffer, size_t* const fileSize, uint8_t *const fileBuffer)
{
InterruptsDisableInt(INT_SOURCE_VBLANK);
/* Get file data from input file path. */
FILE* pFile = fopen((char*)buffer, "rb");
InterruptsEnableInt(INT_SOURCE_VBLANK);
if (pFile != NULL)
{
/* Move file pointer to end of file. */
if (fseek(pFile, 0, SEEK_END) == 0 /* Success code. */)
{
if (fileSize != NULL)
{
/* File pointer could be successfully
* moved to the new position. */
/* Return file size in bytes to upper layers. */
*fileSize = ftell(pFile);
if (*fileSize <= FILE_BUFFER_SIZE)
{
/* Buffer was successfully allocated according
* to file size. Now read file data into buffer. */
/* Reset file pointer iterator position first. */
if (fseek(pFile, 0, SEEK_SET) == 0 /* Sucess code. */)
{
/* Read file data into newly allocated buffer. */
const size_t eReadBytes = fread(fileBuffer, sizeof (uint8_t), *fileSize, pFile);
/* Close input opened file first. */
fclose(pFile);
if (eReadBytes == *fileSize)
{
/* All bytes could be read from input file successfully. */
/* Finally, return address to buffer so it can be
* used by external modules. */
printf("%s has been successfully uploaded\n", buffer);
return fileBuffer;
}
else
{
/* Not all bytes from file were read.
* Fall through. */
}
}
else
{
/* Something went wrong with fseek().
* Fall through. */
}
}
else
{
/* Buffer cannot hold such amount of data.
* Fall through. */
printf("%s does not fit into internal buffer (%u / %u bytes)\n",
buffer, *fileSize, FILE_BUFFER_SIZE);
}
/* Set file size to an invalid value. */
*fileSize = IO_INVALID_FILE_SIZE;
}
else
{
/* Invalid pointer to file size. */
}
}
else
{
/* Something went wrong with fseek().
* Fall through. */
}
}
else
{
/* File does not exist. Fall through. */
printf("File %s does not exist\n", buffer);
}
return NULL;
}
#else /* SERIAL_INTERFACE */
static const uint8_t *IOLoadFileFromSerial(char* const buffer, size_t* const fileSize, uint8_t *const fileBuffer)
{
uint8_t receivedSizeb[sizeof (uint32_t)] = {0};
size_t receivedSize = 0;
size_t i;
Serial_printf("#%s@", buffer);
SerialRead(receivedSizeb, sizeof (uint32_t));
for (i = 0; i < sizeof (uint32_t); i++)
{
receivedSize |= receivedSizeb[i] << (i << 3); // (i << 3) == (i * 8)
}
SerialWrite(ACK_BYTE_STRING, sizeof (uint8_t));
if (receivedSize <= FILE_BUFFER_SIZE)
{
for (i = 0; i < receivedSize; i += SERIAL_DATA_PACKET_SIZE)
{
size_t bytes_to_read;
// Read actual EXE data into proper RAM address.
if ( (i + SERIAL_DATA_PACKET_SIZE) >= receivedSize)
{
bytes_to_read = receivedSize - i;
}
else
{
bytes_to_read = SERIAL_DATA_PACKET_SIZE;
}
SerialRead(&fileBuffer[i], bytes_to_read);
SerialWrite(ACK_BYTE_STRING, sizeof (uint8_t)); // Write ACK
}
*fileSize = receivedSize;
return fileBuffer;
}
else
{
printf("Input file %s cannot be stored into internal buffer\n", buffer);
}
*fileSize = 0;
return NULL;
}
#endif /* SERIAL_INTERFACE */
/*******************************************************************//**
*
* \brief Loads a file with absolute file path indicated by
* strFileName.
*
* File data is stored into a statically-allocated buffer
* which can then be handled by external modules.
*
* \param strFilePath
* Relative file path e.g.:
* "DATA\\SPRITES\\TILESET1.TIM".
*
* \param fileSize
* Pointer to size_t variable where file size will
* be stored.
*
* \return Address to a read-only buffer with file data if successful,
* NULL pointer otherwise.
*
* \return fileSize is assigned to actual file size in bytes if
* successful, \ref IO_INVALID_FILE_SIZE otherwise.
*
************************************************************************/
const uint8_t *IOLoadFile(const char* const strFilePath, size_t* const fileSize)
{
if (strFilePath)
{
enum
{
MAX_FILE_PATH_LENGTH = 128
};
/* This buffer shall be used to concatenate "cdrom:\\"
* and ";1" substrings along with indicated file path. */
static char buffer[MAX_FILE_PATH_LENGTH];
/* Create absolute file path from indicated path. */
snprintf(buffer, sizeof (buffer), "cdrom:\\%s;1", strFilePath);
if (buffer != NULL)
{
/* This buffer holds file data read from CD-ROM or serial port.
* It is cleared out on each call to IOLoadFile(),
* so copy its contents into an auxilar buffer if needed. */
static uint8_t fileBuffer[FILE_BUFFER_SIZE];
#ifdef SERIAL_INTERFACE
return IOLoadFileFromSerial(buffer, fileSize, fileBuffer);
#else /* SERIAL_INTERFACE */
return IOLoadFileFromCd(buffer, fileSize, fileBuffer);
#endif /* SERIAL_INTERFACE */
}
else
{
/* File path could not be stored. */
}
}
else
{
/* Invalid pointer to file path. */
}
/* Return failure code if this was reached. */
return NULL;
}
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