#ifndef SIM_JSON_H_#define SIM_JSON_H_#ifdef __cplusplusextern "C" {#endifstruct json_object;typedef struct json_object* json_object_handle;json_object_handle create_json_object(const char* const buffer,int len);const char* get_object_value(json_object_handle h, const char*const name);void desdroy_json_object(json_object_handle h);struct json_array;typedef struct json_array* json_array_handle;json_array_handle create_json_array(const char* const buffer, int len);const char* get_array_value(json_array_handle h, int index);void destroy_json_array(json_array_handle h);#ifdef __cplusplus}#endif#endif /* SIM_JSON_H_ */#include "sim_json.h"#include "string.h"#include "stdlib.h"#include "stdio.h"#define hint printf#define json_name_len 64#define json_value_len 1024*16#define json_item_counts 32typedef struct json_object_item_tag {char name[json_name_len];char value[json_value_len];} json_object_item, *json_object_item_hanle;struct json_object {unsigned item_counts;json_object_item items[json_item_counts];};#define char_convertor(str) (('\\' == *str) ? *(++str) : *(str))static const char*const split_object(char* dst,const char* str,int len,const char split[2]){unsigned object_counts = 1;for (*dst++ = *str++; len > 0 && object_counts; --len, ++str) {if(split[0] == *str){++object_counts;}if(split[1] == *str){--object_counts;}*dst++ = char_convertor(str);}return (0 == object_counts) ? str : NULL;}static const char* const get_json_value(char* value,const char* str, int len) {for (; ',' != *str && '}' != *str && len > 0; --len,++str) {*value++ = char_convertor(str);}return str;}static const char* const get_json_object(char* value,const char* str, int len) {char spliter[2] = {'{','}'};return split_object(value,str,len,spliter);}static const char*const get_json_array(char* value,const char* str, int len) {char spliter[2] = {'[',']'};return split_object(value,str,len,spliter);}static const char* const pass_json_item(json_object_item_hanle h,const char* str, int len) {const char*const org_str = str;memset(h, 0 , sizeof(*h));str = strchr(str,'"');if(NULL == str){return NULL;}sscanf(++str,"%[^\"]",h->name);str = strchr(str,':');if(NULL == str){return NULL;}++str;len -= (str - org_str);for(;' ' == *str && len > 0;++str,--len){;}switch(*str){case '{': return get_json_object(h->value,str,len); break;case '[': return get_json_array(h->value,str,len); break;default: return get_json_value(h->value,str,len);}}json_object_handle create_json_object(const char* const buffer, int len){const char* str = buffer;json_object_handle ret = malloc(sizeof(struct json_object));if(NULL == ret){return NULL;}memset(ret , 0 , sizeof(struct json_object));for(;NULL != str && len > 0 ;++str,--len){str = pass_json_item(&ret->items[ret->item_counts++],str,len);len = strlen(str);}if(NULL == str){hint("parse buffer failed:%s\n",buffer);free(ret);return NULL;}return ret;}const char* get_object_value(json_object_handle h, const char* const name){int i = 0;if(NULL == h){return NULL;}for(; i < h->item_counts;++i){if(0 == strcmp(name,h->items[i].name)){return h->items[i].value;}}return NULL;}void desdroy_json_object(json_object_handle h){free(h);}struct json_array{int item_counts;char items[json_item_counts][json_value_len];};static const char*const pass_array_item(char* dst,const char* str){int len = strlen(str);for(;' ' == *str && len > 0; --len,++str){;}switch(*str){case '{' : return get_json_object(dst,str,len);case '[' : return get_json_array(dst,str,len);default : return get_json_value(dst,str,len);}}json_array_handle create_json_array(const char* const buffer, int len){const char* str = buffer;json_array_handle ret = malloc(sizeof(struct json_array));if(NULL == ret){hint("alloc failed\n");return NULL;}memset(ret , 0 , sizeof(struct json_array));for(;' ' == *str && len > 0; --len,++str){;}++str;for(;']' != *str && len > 0; ){str = pass_array_item(ret->items[ret->item_counts++],str);len = strlen(str);}return ret;}const char* get_array_value(json_array_handle h, int index){if(NULL == h){return NULL;}if(index > h->item_counts){return NULL;}return h->items[index];}void destroy_json_array(json_array_handle h){free(h);}#ifdef test_debugstatic const char*const json_str1="{\"command\":123,\"parament\":[{\"u_name\":'aaa',\"pass\":'123456'}],\"client_context\":\\\"aaa\\\",\"server_context\":3321}";int main(int argn,char* argv[]){json_object_handle jh = create_json_object(json_str1,strlen(json_str1));json_object_handle jh2 = NULL;json_array_handle jah = NULL;const char* json_a_str = NULL;const char* json_str2 = NULL;printf("%s\n",json_str1);if(NULL == jh){return -1;}printf("command:%s\n",get_object_value(jh,"command"));printf("parament:%s\n",get_object_value(jh,"parament"));printf("client_context:%s\n",get_object_value(jh,"client_context"));printf("server_context:%s\n",get_object_value(jh,"server_context"));json_a_str = get_object_value(jh,"parament");jah = create_json_array(json_a_str,strlen(json_a_str));if(NULL == jah){hint("create array failed:%s\n",json_a_str);return -2;}json_str2 = get_array_value(jah,0);if(NULL == json_str2){hint("get array 0 failed\n");return -3;}jh2 = create_json_object(json_str2,strlen(json_str2));printf("u_name:%s\n",get_object_value(jh2,"u_name"));printf("pass:%s\n",get_object_value(jh2,"pass"));desdroy_json_object(jh2);desdroy_json_object(jh);destroy_json_array(jah);return 0;}#endif
