cJSON学习总结(含VS2010的实例工程)

/* Copyright (c) 2009-2017 Dave Gamble and cJSON contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* cJSON */ /* JSON parser in C. */ /* disable warnings about old C89 functions in MSVC */ #if !defined(_CRT_SECURE_NO_DEPRECATE) && defined(_MSC_VER) #define _CRT_SECURE_NO_DEPRECATE #endif #ifdef __GNUC__ #pragma GCC visibility push(default) #endif #if defined(_MSC_VER) #pragma warning (push) /* disable warning about single line comments in system headers */ #pragma warning (disable : 4001) #endif #include <string.h> #include <stdio.h> #include <math.h> #include <stdlib.h> #include <limits.h> #include <ctype.h> #include <float.h> #ifdef ENABLE_LOCALES #include <locale.h> #endif #if defined(_MSC_VER) #pragma warning (pop) #endif #ifdef __GNUC__ #pragma GCC visibility pop #endif #include "cJSON.h" /* define our own boolean type */ #ifdef true #undef true #endif #define true ((cJSON_bool)1) #ifdef false #undef false #endif #define false ((cJSON_bool)0) /* define isnan and isinf for ANSI C, if in C99 or above, isnan and isinf has been defined in math.h */ #ifndef isinf #define isinf(d) (isnan((d - d)) && !isnan(d)) #endif #ifndef isnan #define isnan(d) (d != d) #endif #ifndef NAN #ifdef _WIN32 #define NAN sqrt(-1.0) #else #define NAN 0.0/0.0 #endif #endif typedef struct { const unsigned char *json; size_t position; } error; static error global_error = { NULL, 0 }; CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void) { return (const char*) (global_error.json + global_error.position); } CJSON_PUBLIC(char *) cJSON_GetStringValue(const cJSON * const item) { if (!cJSON_IsString(item)) { return NULL; } return item->valuestring; } CJSON_PUBLIC(double) cJSON_GetNumberValue(const cJSON * const item) { if (!cJSON_IsNumber(item)) { return (double) NAN; } return item->valuedouble; } /* This is a safeguard to prevent copy-pasters from using incompatible C and header files */ #if (CJSON_VERSION_MAJOR != 1) || (CJSON_VERSION_MINOR != 7) || (CJSON_VERSION_PATCH != 15) #error cJSON.h and cJSON.c have different versions. Make sure that both have the same. #endif CJSON_PUBLIC(const char*) cJSON_Version(void) { static char version[15]; sprintf(version, "%i.%i.%i", CJSON_VERSION_MAJOR, CJSON_VERSION_MINOR, CJSON_VERSION_PATCH); return version; } /* Case insensitive string comparison, doesn't consider two NULL pointers equal though */ static int case_insensitive_strcmp(const unsigned char *string1, const unsigned char *string2) { if ((string1 == NULL) || (string2 == NULL)) { return 1; } if (string1 == string2) { return 0; } for(; tolower(*string1) == tolower(*string2); (void)string1++, string2++) { if (*string1 == '\0') { return 0; } } return tolower(*string1) - tolower(*string2); } typedef struct internal_hooks { void *(CJSON_CDECL *allocate)(size_t size); void (CJSON_CDECL *deallocate)(void *pointer); void *(CJSON_CDECL *reallocate)(void *pointer, size_t size); } internal_hooks; #if defined(_MSC_VER) /* work around MSVC error C2322: '...' address of dllimport '...' is not static */ static void * CJSON_CDECL internal_malloc(size_t size) { return malloc(size); } static void CJSON_CDECL internal_free(void *pointer) { free(pointer); } static void * CJSON_CDECL internal_realloc(void *pointer, size_t size) { return realloc(pointer, size); } #else #define internal_malloc malloc #define internal_free free #define internal_realloc realloc #endif /* strlen of character literals resolved at compile time */ #define static_strlen(string_literal) (sizeof(string_literal) - sizeof("")) static internal_hooks global_hooks = { internal_malloc, internal_free, internal_realloc }; static unsigned char* cJSON_strdup(const unsigned char* string, const internal_hooks * const hooks) { size_t length = 0; unsigned char *copy = NULL; if (string == NULL) { return NULL; } length = strlen((const char*)string) + sizeof(""); copy = (unsigned char*)hooks->allocate(length); if (copy == NULL) { return NULL; } memcpy(copy, string, length); return copy; } CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks* hooks) { if (hooks == NULL) { /* Reset hooks */ global_hooks.allocate = malloc; global_hooks.deallocate = free; global_hooks.reallocate = realloc; return; } global_hooks.allocate = malloc; if (hooks->malloc_fn != NULL) { global_hooks.allocate = hooks->malloc_fn; } global_hooks.deallocate = free; if (hooks->free_fn != NULL) { global_hooks.deallocate = hooks->free_fn; } /* use realloc only if both free and malloc are used */ global_hooks.reallocate = NULL; if ((global_hooks.allocate == malloc) && (global_hooks.deallocate == free)) { global_hooks.reallocate = realloc; } } /* Internal constructor. */ static cJSON *cJSON_New_Item(const internal_hooks * const hooks) { cJSON* node = (cJSON*)hooks->allocate(sizeof(cJSON)); if (node) { memset(node, '\0', sizeof(cJSON)); } return node; } /* Delete a cJSON structure. */ CJSON_PUBLIC(void) cJSON_Delete(cJSON *item) { cJSON *next = NULL; while (item != NULL) { next = item->next; if (!(item->type & cJSON_IsReference) && (item->child != NULL)) { cJSON_Delete(item->child); } if (!(item->type & cJSON_IsReference) && (item->valuestring != NULL)) { global_hooks.deallocate(item->valuestring); } if (!(item->type & cJSON_StringIsConst) && (item->string != NULL)) { global_hooks.deallocate(item->string); } global_hooks.deallocate(item); item = next; } } /* get the decimal point character of the current locale */ static unsigned char get_decimal_point(void) { #ifdef ENABLE_LOCALES struct lconv *lconv = localeconv(); return (unsigned char) lconv->decimal_point[0]; #else return '.'; #endif } typedef struct { const unsigned char *content; size_t length; size_t offset; size_t depth; /* How deeply nested (in arrays/objects) is the input at the current offset. */ internal_hooks hooks; } parse_buffer; /* check if the given size is left to read in a given parse buffer (starting with 1) */ #define can_read(buffer, size) ((buffer != NULL) && (((buffer)->offset + size) <= (buffer)->length)) /* check if the buffer can be accessed at the given index (starting with 0) */ #define can_access_at_index(buffer, index) ((buffer != NULL) && (((buffer)->offset + index) < (buffer)->length)) #define cannot_access_at_index(buffer, index) (!can_access_at_index(buffer, index)) /* get a pointer to the buffer at the position */ #define buffer_at_offset(buffer) ((buffer)->content + (buffer)->offs