Automatically pick file name

This commit is contained in:
fruchti 2020-05-23 22:46:32 +02:00
parent 2a9bf62d5b
commit b808cebdea
3 changed files with 55 additions and 2 deletions

View file

@ -1 +1 @@
545
549

View file

@ -19,6 +19,51 @@ typedef struct
uint16_t bits_per_pixel;
} __attribute((packed)) BMP_CoreHeader_t;
const char* BMP_FilenamePrefix = "TCIM-";
int BMP_PickFileNumber(void)
{
int maximum = -1;
DIR dp;
if(f_opendir(&dp, "/") != FR_OK)
return -1;
FILINFO finfo;
for(;;)
{
FRESULT rc = f_readdir(&dp, &finfo);
if(rc != FR_OK || finfo.fname[0] == 0)
break;
// Check if the item is a directory
if(finfo.fattrib & AM_DIR)
continue;
if(strncmp(finfo.fname, BMP_FilenamePrefix, strlen(BMP_FilenamePrefix))
== 0)
{
int number = atoi(finfo.fname + strlen(BMP_FilenamePrefix));
if(number > maximum)
maximum = number;
}
}
return maximum + 1;
}
void BMP_ConstructFilename(int number, char *buffer, unsigned int size)
{
unsigned int prefix_length = strlen(BMP_FilenamePrefix);
memcpy(buffer, BMP_FilenamePrefix, prefix_length);
for(unsigned int i = size - 6; i >= prefix_length; i--)
{
buffer[i] = '0' + (number % 10);
number /= 10;
}
memcpy(buffer + size - 5, ".BMP", 5);
}
void BMP_Save(uint8_t *data, int width, int height)
{
FATFS fs;
@ -32,7 +77,13 @@ void BMP_Save(uint8_t *data, int width, int height)
return;
}
rc = f_open(&fp, "IMAGE.BMP", FA_WRITE | FA_CREATE_ALWAYS);
int file_number = BMP_PickFileNumber();
if(file_number == -1)
return;
char filename[13];
BMP_ConstructFilename(file_number, filename, sizeof(filename));
rc = f_open(&fp, filename, FA_WRITE | FA_CREATE_ALWAYS);
if(rc)
{
return;

View file

@ -1,5 +1,7 @@
#pragma once
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
void BMP_Save(uint8_t *data, int width, int height);