base64加解密代码,C代码库,德仔网

代码语言
代码分类
【C】 base64加解密
作者:akang / 发布于2015/10/19/ 1230

	#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)
	?
	1
	2
	3
	4
	5
	6
	7
	8
	9
	10
	11
	12
	13
	14
	15
	16
	17
	18
	19
	20
	21
	22
	23
	24
	25
	26
	27
	28
	29
	30
	31
	32
	33
	34
	35
	36
	37
	38
	39
	40
	41
	42
	43
	44
	45
	46
	47
	48
	49
	50
	51
	52
	53
	54
	55
	56
	57
	58
	59
	60
	61
	62
	63
	64
	65
	66
	67
	68
	69
	70
	#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)
	?
	1
	2
	3
	4
	5
	6
	7
	8
	9
	10
	11
	12
	13
	14
	15
	16
	17
	18
	19
	20
	21
	22
	23
	24
	25
	26
	27
	28
	29
	30
	31
	32
	33
	34
	35
	36
	37
	38
	39
	40
	41
	42
	43
	44
	45
	46
	47
	48
	49
	50
	51
	52
	53
	54
	55
	56
	57
	58
	59
	60
	61
	62
	63
	64
	65
	66
	67
	68
	69
	70
	71
	72
	73
	74
	75
	76
	77
	78
	79
	80
	81
	82
	83
	84
	85
	86
	87
	88
	89
	90
	91
	92
	93
	94
	95
	96
	97
	98
	99
	100
	101
	102
	103
	104
	105
	106
	107
	108
	109
	110
	111
	112
	113
	114
	115
	116
	117
	118
	119
	120
	121
	122
	123
	124
	125
	126
	127
	128
	129
	130
	131
	132
	133
	134
	135
	136
	137
	138
	139
	140
	141
	142
	143
	144
	145
	146
	147
	148
	149
	150
	151
	152
	153
	154
	155
	156
	157
	158
	159
	160
	161
	162
	163
	164
	#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
	?
	1
	2
	3
	4
	5
	6
	7
	8
	9
	10
	11
	12
	13
	14
	15
	16
	17
	18
	19
	20
	21
	22
	23
	24
	25
	26
	27
	28
	29
	30
	31
	32
	33
	34
	35
	36
	37
	38
	39
	40
	41
	42
	43
	44
	45
	46
	47
	48
	49
	50
	51
	52
	53
	54
	55
	56
	57
	58
	59
	60
	61
	62
	63
	64
	65
	66
	67
	#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;
	}
评论列表
本站所提供的代码，版权归原作者所有，若有侵犯作者版权，请与我们联系，我们将立即删除或修改。谢谢!
本站所有代码发布及提供者。
试试其它关键字
同语言下
可能有用的
akang贡献的其它代码(20)