131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/* SPIFFS Image Generation on Build Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/unistd.h>
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#include <sys/stat.h>
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#include "esp_err.h"
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#include "esp_log.h"
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#include "esp_spiffs.h"
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#include "mbedtls/md5.h"
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static const char *TAG = "example";
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static void read_hello_txt(void)
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{
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ESP_LOGI(TAG, "Reading hello.txt");
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// Open for reading hello.txt
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FILE* f = fopen("/spiffs/hello.txt", "r");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open hello.txt");
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return;
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}
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char buf[64];
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memset(buf, 0, sizeof(buf));
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fread(buf, 1, sizeof(buf), f);
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fclose(f);
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// Display the read contents from the file
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ESP_LOGI(TAG, "Read from hello.txt: %s", buf);
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}
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static void compute_alice_txt_md5(void)
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{
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ESP_LOGI(TAG, "Computing alice.txt MD5 hash");
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// The file alice.txt lives under a subdirectory, though SPIFFS itself is flat
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FILE* f = fopen("/spiffs/sub/alice.txt", "r");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open alice.txt");
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return;
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}
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// Read file and compute the digest chunk by chunk
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#define MD5_MAX_LEN 16
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char buf[64];
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mbedtls_md5_context ctx;
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unsigned char digest[MD5_MAX_LEN];
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mbedtls_md5_init(&ctx);
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mbedtls_md5_starts_ret(&ctx);
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size_t read;
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do {
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read = fread((void*) buf, 1, sizeof(buf), f);
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mbedtls_md5_update_ret(&ctx, (unsigned const char*) buf, read);
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} while(read == sizeof(buf));
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mbedtls_md5_finish_ret(&ctx, digest);
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// Create a string of the digest
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char digest_str[MD5_MAX_LEN * 2];
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for (int i = 0; i < MD5_MAX_LEN; i++) {
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sprintf(&digest_str[i * 2], "%02x", (unsigned int)digest[i]);
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}
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// For reference, MD5 should be deeb71f585cbb3ae5f7976d5127faf2a
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ESP_LOGI(TAG, "Computed MD5 hash of alice.txt: %s", digest_str);
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fclose(f);
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}
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void app_main(void)
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{
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ESP_LOGI(TAG, "Initializing SPIFFS");
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esp_vfs_spiffs_conf_t conf = {
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.base_path = "/spiffs",
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.partition_label = NULL,
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.max_files = 5,
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.format_if_mount_failed = false
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};
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// Use settings defined above to initialize and mount SPIFFS filesystem.
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// Note: esp_vfs_spiffs_register is an all-in-one convenience function.
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esp_err_t ret = esp_vfs_spiffs_register(&conf);
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if (ret != ESP_OK) {
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if (ret == ESP_FAIL) {
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ESP_LOGE(TAG, "Failed to mount or format filesystem");
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} else if (ret == ESP_ERR_NOT_FOUND) {
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ESP_LOGE(TAG, "Failed to find SPIFFS partition");
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} else {
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ESP_LOGE(TAG, "Failed to initialize SPIFFS (%s)", esp_err_to_name(ret));
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}
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return;
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}
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size_t total = 0, used = 0;
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ret = esp_spiffs_info(NULL, &total, &used);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to get SPIFFS partition information (%s)", esp_err_to_name(ret));
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} else {
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ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used);
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}
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/* The following calls demonstrate reading files from the generated SPIFFS
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* image. The images should contain the same files and contents as the spiffs_image directory.
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*/
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// Read and display the contents of a small text file (hello.txt)
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read_hello_txt();
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// Compute and display the MD5 hash of a large text file (alice.txt)
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compute_alice_txt_md5();
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// All done, unmount partition and disable SPIFFS
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esp_vfs_spiffs_unregister(NULL);
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ESP_LOGI(TAG, "SPIFFS unmounted");
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}
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