c/c++采用编码转换表实现gbk与unicode互转

#include <iostream> #include "unicodeTables.h" #include "gbkTables.h" using namespace std; //gbk->unicode int GbkToUnicode(char *gbk_buf, unsigned short *unicode_buf, int max_unicode_buf_size) { unsigned short word; unsigned char *gbk_ptr =(unsigned char *) gbk_buf; unsigned short *uni_ptr = unicode_buf; unsigned int uni_ind = 0, gbk_ind = 0, uni_num = 0; unsigned char ch; int word_pos; if( !gbk_buf || !unicode_buf ) return -1; while(1) { ch = *(gbk_ptr + gbk_ind); if(ch == 0x00) break; if( ch > 0x80 ) { //将gbk编码的中文字符的两个字节组合成一个 unsigned short word; word = *(gbk_ptr + gbk_ind); word <<= 8; word += *(gbk_ptr + gbk_ind+1); gbk_ind += 2; word_pos = word - gbk_first_code; if(word >= gbk_first_code && word <= gbk_last_code && (word_pos < unicode_buf_size)) { *(uni_ptr + uni_ind) = unicodeTables[word_pos]; uni_ind++; uni_num++; } } else { gbk_ind++; *(uni_ptr + uni_ind) = ch; uni_ind++; uni_num++; } if(uni_num > max_unicode_buf_size - 1) break; } return uni_num; } //unicode->gbk int UnicodeToGbk(unsigned short *unicode_buf, char *gbk_buf, int max_gbk_buf_size) { unsigned short word; unsigned short gbk_word; unsigned char ch; unsigned char *gbk_ptr =(unsigned char *) gbk_buf; unsigned short *uni_ptr = unicode_buf; unsigned int uni_ind = 0, gbk_ind = 0, gbk_num = 0; int word_pos; if( !gbk_buf || !unicode_buf ) return -1; while(1) { word = *(uni_ptr + uni_ind); uni_ind++; if(word == 0x0000) //字符串结束符 break; if(word < 0x80) /*ASCII不用查表*/ { *(gbk_ptr + gbk_ind) = (unsigned char)word; gbk_ind++; } else { word_pos = word - unicode_first_code; if(word >= unicode_first_code && word <= unicode_last_code && word_pos < gbk_buf_size) { gbk_word = gbkTables[word_pos];//gbk_word是gbk编码，但是为unsigned short类型，需要拆分成两个字节 *(gbk_ptr + gbk_ind) = (unsigned char)(gbk_word >> 8);//提取高8位 gbk_ind++; *(gbk_ptr + gbk_ind) = (unsigned char)(gbk_word >> 0);//提取低8位 gbk_ind++; gbk_num +=2;//gbk字符加2个 } } if(gbk_num > max_gbk_buf_size - 1) break; } return gbk_num; } int main() { ////1、gbk->unicode //char *strGbk ="我"; //unsigned short strUnicode[5] ={0x00}; // // int num = GbkToUnicode(strGbk,strUnicode,5); // // unsigned char* p = (unsigned char*)strUnicode; // for (int i = 0; i < num*2; i++) // { // printf("%0x", *p); // p++; // }//输出1162 // printf("\n"); //2、unicode->gbk unsigned short strUnicode[2] = {0x6211,0x00};//加上0x00字符串结束符,终止函数内部的循环 char strGbk[5]={0x00}; int num = UnicodeToGbk(strUnicode,strGbk,5); unsigned char* p = (unsigned char*)strGbk; for (int i = 0; i < num; i++) { printf("%0x", *p); p++; }//输出ced2 printf("\n"); return 0; }