尝试修复#19

- 移除未使用的参数 int blen
- 完善文档、注释
- 完善文件名错误检测
- 修复 encbuf, decbuf 处理逻辑

base1464.c

@@ -1,6 +1,6 @@
 /* base1464.c
  * This file is part of the base16384 distribution (https://github.com/fumiama/base16384).
- * Copyright (c) 2022 Fumiama Minamoto.
+ * Copyright (c) 2022-2023 Fumiama Minamoto.
  * 
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -62,7 +62,7 @@
 
 // #define DEBUG
 
-int base16384_encode(const char* data, int dlen, char* buf, int blen) {
+int base16384_encode(const char* data, int dlen, char* buf) {
 	int outlen = dlen / 7 * 8;
 	int offset = dlen % 7;
 	switch(offset) {	// 算上偏移标志字符占用的2字节
@@ -136,7 +136,7 @@ int base16384_encode(const char* data, int dlen, char* buf, int blen) {
 	return outlen;
 }
 
-int base16384_decode(const char* data, int dlen, char* buf, int blen) {
+int base16384_decode(const char* data, int dlen, char* buf) {
 	int outlen = dlen;
 	int offset = 0;
 	if(data[dlen-2] == '=') {