Added b64decode command to decode base64 payload into file.

filesystem/filesystem.c

@@ -318,6 +318,26 @@ int filesystem_cmd_b64encode(int argc, char *argv[]) {
     return 0;
 }
 
+int filesystem_cmd_b64decode(int argc, char *argv[]) {
+    (void) argc;
+    char *buf = malloc(strlen(argv[1]) * 1.5 + 1);
+    unsigned int decoded_size = b64_decode((unsigned char *)argv[1], strlen(argv[1]), (unsigned char *)buf);
+    if (!decoded_size) {
+        printf("No bytes decoded.\r\n");
+        return 0;
+    }
+    if (!strcmp(argv[2], ">>")) {
+        if (filesystem_file_exists(argv[3])) {
+            filesystem_append_file(argv[3], buf, decoded_size);
+        } else {
+            printf("b64decode: %s: No such file\r\n", argv[3]);
+        }
+    } else if (!strcmp(argv[2], ">")) {
+            filesystem_write_file(argv[3], buf, decoded_size);
+    }
+    return 0;
+}
+
 int filesystem_cmd_df(int argc, char *argv[]) {
     (void) argc;
     (void) argv;

filesystem/filesystem.h

@@ -99,6 +99,7 @@ bool filesystem_append_file(char *filename, char *text, int32_t length);
 int filesystem_cmd_ls(int argc, char *argv[]);
 int filesystem_cmd_cat(int argc, char *argv[]);
 int filesystem_cmd_b64encode(int argc, char *argv[]);
+int filesystem_cmd_b64decode(int argc, char *argv[]);
 int filesystem_cmd_df(int argc, char *argv[]);
 int filesystem_cmd_rm(int argc, char *argv[]);
 int filesystem_cmd_format(int argc, char *argv[]);

shell/shell_cmd_list.c

@@ -79,6 +79,13 @@ shell_command_t g_shell_commands[] = {
         .max_args = 1,
         .cb = filesystem_cmd_b64encode,
     },
+    {
+        .name = "b64decode",
+        .help = "usage: b64decode <PAYLOAD> {>, >>} <FILE>",
+        .min_args = 3,
+        .max_args = 3,
+        .cb = filesystem_cmd_b64decode,
+    },
     {
         .name = "df",
         .help = "print filesystem free space",