base64加解密代码,C代码库,德仔网

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【C】 base64加解密
作者:akang / 发布于2015/10/19/ 1232

	#ifndef _MY_COMMON_H
	#define _MY_COMMON_H
	
	#include <stdio.h>
	#include <string.h>
	#include <stdlib.h>
	#include <math.h>
	#include <stddef.h>
	
	#include "my_dbug.h"
	
	#ifdef __cplusplus
	#define _BEGIN_C extern "C" {
	#define _END_C }
	#else
	#define _BEGIN_C
	#define _END_C
	#endif
	
	
	/* for portability */
	typedef unsigned char uchar;
	typedef unsigned int uint;
	typedef signed char int8;
	typedef unsigned char uint8;
	typedef short int16;
	typedef unsigned short uint16;
	
	#if SIZEOF_INT == 4
	typedef int int32;
	typedef unsigned int uint32;
	#elif SIZEOF_LONG == 4
	typedef long int32;
	typedef unsigned long uint32;
	#else
	#error neither int or long of 4 bytes width
	#endif
	
	typedef unsigned long ulong;
	typedef unsigned long long ulonglong;
	typedef long long longlong;
	typedef longlong int64;
	typedef ulonglong uint64;
	
	typedef char my_bool;
	#ifdef FALSE
	#undef FALSE
	#define FALSE 0
	#endif
	
	#ifdef TRUE
	#undef TRUE
	#define TURE 1
	#endif
	
	#define R_OK 0
	#define R_FAIL 1
	
	/* macro of tools*/
	#define MY_MAX(a,b) ((a) > (b) ? (a) : (b))
	#define MY_MIN(a,b) ((a) < (b) ? (a) : (b))
	
	/* for malloc */
	#define MALLOC_OVERHEAD 8
	
	
	#endif /* _MY_COMMON_H */
	2. [文件] base64.h ~ 2KB 下载(0)
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	#ifndef _BASE64_H
	#define _BASE64_H
	
	#include "my_common.h"
	
	typedef struct base64_decoder {
	 const char * src;
	 const char * end;
	 uint c;
	 int error;
	 uchar state;
	 uchar mask;
	} base64_decoder_t;
	
	/**
	@name:base64_needed_encoded_length
	@function:to obtain the length of coding length_of_data
	@param: int length_of_data: length_of_data is length of data that be coded
	@return: the length of coding length_of_data
	*/
	int base64_needed_encoded_length(int length_of_data);
	
	/**
	@name:base64_encode_max_arg_length
	@function:to obtain Maximum length base64_needed_encoded_length can handle without overflow
	@param:null
	@return:Maximum length base64_needed_encoded_length can handle without overflow
	*/
	int base64_encode_max_arg_length();
	
	/**
	@name:base64_needed_decoded_length
	@function:to obtain the minmum length of decoding length_of_data
	@param:length_of_data is a variable that the length of data be decoded
	@return:the minmum length of decoding length_of_data
	*/
	int base64_needed_decoded_length(int length_of_data);
	
	/**
	@name:base64_decode_max_arg_length
	@function:to obtain Maximum length base64_needed_decoded_length can handle without overflow.
	@param:null
	@return: Maximum length base64_needed_decoded_length can handle without overflow.
	*/
	int base64_decode_max_arg_length();
	
	/**
	@name:base64_encode
	@function:encode data
	@param: const void * src: the pointer to data be encoded
	 size_t src_len: length of data be encoded
	 char * dst: pointer to buffer that data encoded is stored
	@return: always return 0
	*/
	int base64_encode(const void * src, size_t src_len, char * dst);
	
	/**
	@name:base64_decode
	@function:decode data
	@param: const void * src: the pointer to data be decoded
	 size_t src_len: length of data be decoded
	 char * dst: pointer to buffer that data decoded is stored
	@return: 0 is fail, other is length of data decoded
	*/
	int base64_decode(const void * src, size_t src_len, char * dst) ;
	
	
	
	
	#endif /* _BASE64_H */
	3. [文件] base64.c ~ 4KB 下载(0)
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	#include "my_common.h"
	#include "base64.h"
	
	static char base64_table[]="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	static char from_base64_table[]=
	{
	/*00*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-2,-2,-2,-2,-2,-1,-1,
	/*10*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
	/*20*/ -2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63, /* !"#$%&'()*+,-./ */
	/*30*/ 52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1, /* 0123456789:;<=>? */
	/*40*/ -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14, /* @ABCDEFGHIJKLMNO */
	/*50*/ 15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1, /* PQRSTUVWXYZ[\]^_ */
	/*60*/ -1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40, /* `abcdefghijklmno */
	/*70*/ 41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1, /* pqrstuvwxyz{|}~ */
	/*80*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
	/*90*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
	/*A0*/ -2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
	/*B0*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
	/*C0*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
	/*D0*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
	/*E0*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
	/*F0*/ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
	};
	
	
	int base64_needed_encoded_length(int length_of_data) {
	 int nb_base64_len;
	 nb_base64_len = (length_of_data + 2) / 3 * 4;
	 return nb_base64_len +
	 (nb_base64_len - 1)/76 + /*newlines*/
	 1; /*nul terminate of string */
	}
	
	int base64_encode_max_arg_length() {
	#if (SIZEOF_INT == 8)
	 /*
	 bacause
	 7ffffffffffffffd=base64_needed_encoded_length(0x5EC0D4C77B03531B)
	 8000000000000001=base64_needed_encoded_length(0x5EC0D4C77B03531C)
	 */
	 return 0x5EC0D4C77B03531BLL;
	#else
	 /*
	 because
	 0x0FFFFFFE=base64_needed_encoded_length(0x5EC0D4C6)
	 0x80000003=base64_needed_encoded_length(0x5EC0D4C7)
	 */
	 return 0x5EC0D4C6;
	#endif
	}
	
	int base64_needed_decoded_length(int length_of_data) {
	 return (int) ceil(length_of_data * 3 / 4);
	}
	
	int base64_decode_max_arg_length() {
	#if (SIZEOF_INT == 8)
	 /*
	 because base64_needed_decoded_length method exist a process like that length_of_encoded_data * 3
	 0x2AAAAAAAAAAAAAAA * 3=0x7FFFFFFFFFFFFFFE, nice
	 0x2AAAAAAAAAAAAAAB * 3=0x8000000000000001, larger than 0x7FFFFFFFFFFFFFFF , so overflow
	 */
	 return 0x2AAAAAAAAAAAAAAALL;
	#else
	 /*
	 because base64_needed_decoded_length method exist a process like that length_of_encoded_data * 3
	 0x2AAAAAAA * 3=0x7FFFFFFE, nice
	 0x2AAAAAAB * 3=0x80000001, larger than 0x7FFFFFFF , so overflow
	 */
	 return 0x2AAAAAAA;
	#endif
	}
	
	int base64_encode(const void * src, size_t src_len, char * dst) {
	 const unsigned char * s = (unsigned char *) src;
	 uint32 c;
	 size_t i = 0;
	 size_t len = 0;
	
	 for (i = 0, len=0; i < src_len; len += 4) {
	 if (76 == len) {
	 *dst++ = '\n';
	 }
	 c = s[i];
	 c <<= 8;
	
	 if (i+1 < src_len) {
	 c += s[i+1];
	 }
	 c <<= 8;
	 if (i+2 < src_len) {
	 c += s[i+2];
	 }
	
	 *dst++ = base64_table[(c >> 18) & 0x3F];
	 *dst++ = base64_table[(c >> 12) & 0x3F];
	 if (i+1 < src_len) {
	 *dst++ = base64_table[(c >> 6) & 0x3F];
	 }
	 else {
	 *dst++ = '=';
	 }
	 if (i+2 < src_len) {
	 *dst++ = base64_table[c & 0x3F];
	 }
	 else {
	 *dst++ = '=';
	 }
	 i += 3;
	 }
	 *dst = '\0';
	 return R_OK;
	}
	
	int base64_decode(const void * src, size_t src_len, char * dst) {
	 const unsigned char * s = (unsigned char *)src;
	 uint32 c;
	 int8 r;
	 size_t i = 0;
	 size_t len = 0;
	
	 for (; i < src_len;) {
	 if ('\n' == s[i]) {
	 ++i;
	 }
	 if (-1 == (r = from_base64_table[s[i]])) {
	 return 0;
	 }
	 c = r;
	 c <<= 6;
	 if (-1 == (r = from_base64_table[s[i+1]])) {
	 return 0;
	 }
	 c += r;
	 c <<= 6;
	
	 if ('=' != s[i+2]) {
	 if (-1 == (r = from_base64_table[s[i+2]])) {
	 return 0;
	 }
	 c += r;
	 }
	 else {
	 --len;
	 }
	 c <<= 6;
	
	 if ('=' != s[i+3]) {
	 if (-1 == (r = from_base64_table[s[i+3]])) {
	 return 0;
	 }
	 c += r;
	 } else {
	 --len;
	 }
	
	 *dst++ = c>>16 & 0xFF;
	 *dst++ = c>>8 & 0xFF;
	 *dst++ = c & 0xFF;
	 i += 4;
	 len += 3;
	 }
	 return len;
	}
	4. [代码][C/C++]代码
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	#include "my_sys.h"
	#include <stdio.h>
	
	void test_array() {
	 int element;
	 int * p;
	 int ret;
	 uint i = 0;
	 #define N 100
	 t_dynamic_array array;
	
	 printf("begin test array...\n");
	 init_dynamic(&array, sizeof(int), 5, 5);
	
	 for (i = 0; i < N; ++i) {
	 element = i+1;
	 insert_dynamic(&array, &element);
	 }
	
	 for (i = 0; i < N; ++i) {
	 get_dynamic(&array, &element, i);
	 printf("%d ", element);
	 }
	 printf("\n");
	
	 while (p = pop_dynamic(&array)) {
	 printf("%d ", *p);
	 }
	 printf("end test array\n");
	
	}
	
	void test_base64() {
	 char buffer[1024] = "";
	 char * encode;
	 char * decode;
	 int length;
	
	 printf("begin test base64...\n");
	 fgets(buffer, sizeof(buffer)-1, stdin);
	 buffer[strlen(buffer)-1] = '\0';
	 length = strlen(buffer);
	
	 printf("when origin length=%d, encode length=%d\n", length, base64_needed_encoded_length(length));
	 printf("max origin length:%d\n", base64_encode_max_arg_length());
	 printf("origin string:%s\n", buffer);
	
	 encode = malloc(base64_needed_encoded_length(length));
	 base64_encode(buffer, length, encode);
	 printf("encode string:%s\n", encode);
	
	 length = strlen(encode);
	 printf("when encode length=%d, decode length=%d\n", length, base64_needed_decoded_length(length));
	
	 decode = malloc(base64_needed_decoded_length(length));
	 base64_decode(encode, length, decode);
	 printf("decode string:%s\n", decode);
	
	 printf("end test base64\n");
	
	}
	int main(int argc, char * argv[]) {
	
	// test_array();
	 test_base64();
	 return 0;
	}
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