UTF8转GBK代码
大约 3 分钟
UTF8转GBK代码
目录结构如下：
[root@localhost gbk-utf8]# tree
.
├── main.c
├── utf8.c
└── utf8.h
utf8.h
/**
* Copyright (C) 2008 Huang Guan
* Copyright (C) 2011 iBoxpay.com inc.
*
* $Id: 509d9187fcedee642b722b528884dc8378b93ede $
*
* Description: GBK UTF-8 iconv functions header file
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _UTF8_H
#define _UTF8_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* UTF-8 to GBK
* @param src [in]
* @param dst [out]
* @param len [in] The most bytes which starting at dst, will be written.
*
*/
void utf8_to_gb(const char* src, char* dst, int len);
/**
* GBK to UTF-8
*
* @param src [in]
* @param dst [out]
* @param len [in] The most bytes which starting at dst, will be written.
*/
void gb_to_utf8(const char* src, char* dst, int len);
#ifdef __cplusplus
}
#endif
#endif // end of _UTF8_H
utf8.c
/**
* Copyright (C) 2008 Huang Guan
* Copyright (C) 2011 iBoxpay.com inc.
*
* $Id: 691029ec2ac041372193855b2eb56db17bdac132 $
*
* Description: This file mainly includes the functions about utf8
*
* History:
* 2008-7-10 13:31:57 Created.
* 2011-12-28 Format the code style, and add comments by Lytsing
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifdef __WIN32__
#include <windows.h>
#else
#include <iconv.h>
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <memory.h>
#include "utf8.h"
#ifdef __WIN32__
void utf8_to_gb(const char* src, char* dst, int len)
{
int ret = 0;
WCHAR* strA;
int i= MultiByteToWideChar(CP_UTF8, 0, src, -1, NULL, 0);
if (i <= 0) {
printf("ERROR.");
return;
}
strA = (WCHAR*)malloc(i * 2);
MultiByteToWideChar(CP_UTF8, 0, src, -1, strA, i);
i = WideCharToMultiByte(CP_ACP, 0, strA, -1, NULL, 0, NULL, NULL);
if (len >= i) {
ret = WideCharToMultiByte(CP_ACP, 0, strA, -1, dst, i, NULL, NULL);
dst[i] = 0;
}
if (ret <= 0) {
free(strA);
return;
}
free( strA );
}
void gb_to_utf8(const char* src, char* dst, int len)
{
int ret = 0;
WCHAR* strA;
int i= MultiByteToWideChar(CP_ACP, 0, src, -1, NULL, 0);
if (i <= 0) {
printf("ERROR.");
return;
}
strA = (WCHAR*)malloc(i * 2);
MultiByteToWideChar(CP_ACP, 0, src, -1, strA, i);
i = WideCharToMultiByte(CP_UTF8, 0, strA, -1, NULL, 0, NULL, NULL);
if (len >= i) {
ret = WideCharToMultiByte(CP_UTF8, 0, strA, -1, dst, i, NULL, NULL);
dst[i] = 0;
}
if (ret <= 0) {
free(strA);
return;
}
free(strA);
}
#else //Linux
// starkwong: In iconv implementations, inlen and outlen should be type of size_t not uint, which is different in length on Mac
void utf8_to_gb(const char* src, char* dst, int len)
{
int ret = 0;
size_t inlen = strlen(src) + 1;
size_t outlen = len;
// duanqn: The iconv function in Linux requires non-const char *
// So we need to copy the source string
char* inbuf = (char *)malloc(len);
char* inbuf_hold = inbuf; // iconv may change the address of inbuf
// so we use another pointer to keep the address
memcpy(inbuf, src, len);
char* outbuf = dst;
iconv_t cd;
cd = iconv_open("GBK", "UTF-8");
if (cd != (iconv_t)-1) {
ret = iconv(cd, &inbuf, &inlen, &outbuf, &outlen);
if (ret != 0) {
printf("iconv failed err: %s\n", strerror(errno));
}
iconv_close(cd);
}
free(inbuf_hold); // Don't pass in inbuf as it may have been modified
}
void gb_to_utf8(const char* src, char* dst, int len)
{
int ret = 0;
size_t inlen = strlen(src) + 1;
size_t outlen = len;
// duanqn: The iconv function in Linux requires non-const char *
// So we need to copy the source string
char* inbuf = (char *)malloc(len);
char* inbuf_hold = inbuf; // iconv may change the address of inbuf
// so we use another pointer to keep the address
memcpy(inbuf, src, len);
char* outbuf2 = NULL;
char* outbuf = dst;
iconv_t cd;
// starkwong: if src==dst, the string will become invalid during conversion since UTF-8 is 3 chars in Chinese but GBK is mostly 2 chars
if (src == dst) {
outbuf2 = (char*)malloc(len);
memset(outbuf2, 0, len);
outbuf = outbuf2;
}
cd = iconv_open("UTF-8", "GBK");
if (cd != (iconv_t)-1) {
ret = iconv(cd, &inbuf, &inlen, &outbuf, &outlen);
if (ret != 0)
printf("iconv failed err: %s\n", strerror(errno));
if (outbuf2 != NULL) {
strcpy(dst, outbuf2);
free(outbuf2);
}
iconv_close(cd);
}
free(inbuf_hold); // Don't pass in inbuf as it may have been modified
}
#endif
测试代码main.c
#include "utf8.h"
#include <stdio.h>
#include <string.h>
void printContent(char *p)
{
unsigned int i;
//打印其内容, char *
for(i=0;i<strlen(p);i++)
printf("%02x ",(unsigned char)p[i]);
printf("\n");
}
int main()
{
char dst[4096];
const char src[7] = {(char)0xe6, (char)0x82, (char)0xa8, (char)0xe5, (char)0xa5, (char)0xbd, (char)0x00};//您好
utf8_to_gb(src, dst, 4096);
printContent(dst);
}
编译运行
g++ main.c utf8.c
./a.out
c4 fa ba c3
"您好"的GBK编码的输出C4fa bac3是正确的。
PS
该代码在Linux平台下，本人测试通过，Windows平台本人尚未测试。
参考：
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