base64移植笔记(android)_移植base64-优快云博客

本文链接：https://blog.youkuaiyun.com/lzz137/article/details/118529057

本文介绍了Android源码中base64编码和解码的实现，主要关注于`base64.c`和`base64.h`文件，详细讲解了Base64编码和解码的函数实现过程，包括`base64_encode`和`base64_decode`等。代码遵循BSD许可证，并提供了示例用法，展示了如何在实际项目中使用这些函数进行Base64操作。

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base64源码位置:

android-11.0.0_r36

aosp/external/wpa_supplicant_8/src/utils/base64.c

aosp/external/wpa_supplicant_8/src/utils/base64.h

/*
 * Base64 encoding/decoding (RFC1341)
 * Copyright (c) 2005, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */
#ifndef BASE64_H
#define BASE64_H
char * base64_encode(const void *src, size_t len, size_t *out_len);
unsigned char * base64_decode(const char *src, size_t len, size_t *out_len);
char * base64_url_encode(const void *src, size_t len, size_t *out_len);
unsigned char * base64_url_decode(const char *src, size_t len, size_t *out_len);
#endif /* BASE64_H */

/*
 * Base64 encoding/decoding (RFC1341)
 * Copyright (c) 2005-2019, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */
#include "includes.h"
#include <stdint.h>
#include "os.h"
#include "base64.h"
static const char base64_table[65] =
	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const char base64_url_table[65] =
	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
static char * base64_gen_encode(const unsigned char *src, size_t len,
				size_t *out_len, const char *table, int add_pad)
{
   
	char *out, *pos;
	const unsigned char *end, *in;
	size_t olen;
	int line_len;
	if (len >= SIZE_MAX / 4)
		return NULL;
	olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */
	if (add_pad)
		olen += olen / 72; /* line feeds */
	olen++