mirror of
https://github.com/DaveGamble/cJSON.git
synced 2023-08-10 21:13:26 +03:00
Added buffered printing methods for faster printing.
git-svn-id: svn://svn.code.sf.net/p/cjson/code@61 e3330c51-1366-4df0-8b21-3ccf24e3d50e
This commit is contained in:
Dave Gamble
parent
70984d47e9
commit
d9fc81e6c8
352
cJSON.c
352
cJSON.c
@ -86,7 +86,7 @@ void cJSON_Delete(cJSON *c)
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next=c->next;
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if (!(c->type&cJSON_IsReference) && c->child) cJSON_Delete(c->child);
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if (!(c->type&cJSON_IsReference) && c->valuestring) cJSON_free(c->valuestring);
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if (c->string) cJSON_free(c->string);
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if (!(c->type&cJSON_StringIsConst) && c->string) cJSON_free(c->string);
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cJSON_free(c);
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c=next;
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}
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@ -114,28 +114,56 @@ static const char *parse_number(cJSON *item,const char *num)
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return num;
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}
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/* Render the number nicely from the given item into a string. */
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static char *print_number(cJSON *item)
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static int pow2gt (int x) { --x; x|=x>>1; x|=x>>2; x|=x>>4; x|=x>>8; x|=x>>16; return x+1; }
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typedef struct {char *buffer; int length; int offset; } printbuffer;
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static char* ensure(printbuffer *p,int needed)
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{
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char *newbuffer;int newsize;
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if (!p || !p->buffer) return 0;
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needed+=p->offset;
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if (needed<=p->length) return p->buffer+p->offset;
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newsize=pow2gt(needed);
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newbuffer=(char*)cJSON_malloc(newsize);
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if (!newbuffer) {cJSON_free(p->buffer);p->length=0,p->buffer=0;return 0;}
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if (newbuffer) memcpy(newbuffer,p->buffer,p->length);
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cJSON_free(p->buffer);
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p->length=newsize;
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p->buffer=newbuffer;
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return newbuffer+p->offset;
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}
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static int update(printbuffer *p)
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{
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char *str;
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double d=item->valuedouble;
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if (fabs(((double)item->valueint)-d)<=DBL_EPSILON && d<=INT_MAX && d>=INT_MIN)
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{
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str=(char*)cJSON_malloc(21); /* 2^64+1 can be represented in 21 chars. */
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if (str)
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{
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int i,j,t;
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if (!p || !p->buffer) return 0;
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str=p->buffer+p->offset;
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return p->offset+strlen(str);
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}
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if (d<0) t=-d; else t=d;
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for (i=0;t>0;t/=10) str[i++]='0'+(t%10);
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if (d<0) str[i++]='-';
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str[i--]=0;
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for (j=0;j<i;i--,j++) {t=str[j];str[j]=str[i];str[i]=t;} // reverse the string.
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}
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/* Render the number nicely from the given item into a string. */
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static char *print_number(cJSON *item,printbuffer *p)
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{
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char *str=0;
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double d=item->valuedouble;
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if (d==0)
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{
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if (p) str=ensure(p,2);
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else str=(char*)cJSON_malloc(2); /* special case for 0. */
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if (str) strcpy(str,"0");
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}
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else if (fabs(((double)item->valueint)-d)<=DBL_EPSILON && d<=INT_MAX && d>=INT_MIN)
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{
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if (p) str=ensure(p,21);
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else str=(char*)cJSON_malloc(21); /* 2^64+1 can be represented in 21 chars. */
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if (str) sprintf(str,"%d",item->valueint);
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}
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else
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{
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str=(char*)cJSON_malloc(64); /* This is a nice tradeoff. */
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if (p) str=ensure(p,64);
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else str=(char*)cJSON_malloc(64); /* This is a nice tradeoff. */
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if (str)
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{
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if (fabs(floor(d)-d)<=DBL_EPSILON && fabs(d)<1.0e60)sprintf(str,"%.0f",d);
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@ -231,7 +259,7 @@ static int escapable[256]={ 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1
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0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
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/* Render the cstring provided to an escaped version that can be printed. */
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static char *print_string_ptr(const char *str)
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static char *print_string_ptr(const char *str,printbuffer *p)
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{
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const char *ptr;char *ptr2,*out;int len=0,flag=0;unsigned char token;
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@ -239,7 +267,8 @@ static char *print_string_ptr(const char *str)
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if (!flag)
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{
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len=ptr-str;
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out=(char*)cJSON_malloc(len+3);
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if (p) out=ensure(p,len+3);
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else out=(char*)cJSON_malloc(len+3);
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if (!out) return 0;
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ptr2=out;*ptr2++='\"';
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strcpy(ptr2,str);
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@ -248,10 +277,18 @@ static char *print_string_ptr(const char *str)
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return out;
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}
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if (!str) return cJSON_strdup("");
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if (!str)
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{
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if (p) out=ensure(p,3);
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else out=(char*)cJSON_malloc(3);
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if (!out) return 0;
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strcpy(out,"\"\"");
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return out;
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}
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ptr=str;while ((token=*ptr) && ++len) {if (strchr("\"\\\b\f\n\r\t",token)) len++; else if (token<32) len+=5;ptr++;}
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out=(char*)cJSON_malloc(len+3);
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if (p) out=ensure(p,len+3);
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else out=(char*)cJSON_malloc(len+3);
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if (!out) return 0;
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ptr2=out;ptr=str;
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@ -279,15 +316,15 @@ static char *print_string_ptr(const char *str)
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return out;
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}
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/* Invote print_string_ptr (which is useful) on an item. */
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static char *print_string(cJSON *item) {return print_string_ptr(item->valuestring);}
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static char *print_string(cJSON *item,printbuffer *p) {return print_string_ptr(item->valuestring,p);}
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/* Predeclare these prototypes. */
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static const char *parse_value(cJSON *item,const char *value);
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static char *print_value(cJSON *item,int depth,int fmt);
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static char *print_value(cJSON *item,int depth,int fmt,printbuffer *p);
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static const char *parse_array(cJSON *item,const char *value);
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static char *print_array(cJSON *item,int depth,int fmt);
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static char *print_array(cJSON *item,int depth,int fmt,printbuffer *p);
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static const char *parse_object(cJSON *item,const char *value);
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static char *print_object(cJSON *item,int depth,int fmt);
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static char *print_object(cJSON *item,int depth,int fmt,printbuffer *p);
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/* Utility to jump whitespace and cr/lf */
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static const char *skip(const char *in) {while (in && *in && (unsigned char)*in<=32) in++; return in;}
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@ -312,8 +349,19 @@ cJSON *cJSON_ParseWithOpts(const char *value,const char **return_parse_end,int r
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cJSON *cJSON_Parse(const char *value) {return cJSON_ParseWithOpts(value,0,0);}
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/* Render a cJSON item/entity/structure to text. */
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char *cJSON_Print(cJSON *item) {return print_value(item,0,1);}
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char *cJSON_PrintUnformatted(cJSON *item) {return print_value(item,0,0);}
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char *cJSON_Print(cJSON *item) {return print_value(item,0,1,0);}
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char *cJSON_PrintUnformatted(cJSON *item) {return print_value(item,0,0,0);}
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char *cJSON_PrintBuffered(cJSON *item,int prebuffer,int fmt)
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{
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printbuffer p;
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p.buffer=(char*)cJSON_malloc(prebuffer);
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p.length=prebuffer;
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p.offset=0;
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return print_value(item,0,fmt,&p);
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return p.buffer;
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}
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/* Parser core - when encountering text, process appropriately. */
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static const char *parse_value(cJSON *item,const char *value)
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@ -331,19 +379,35 @@ static const char *parse_value(cJSON *item,const char *value)
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}
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/* Render a value to text. */
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static char *print_value(cJSON *item,int depth,int fmt)
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static char *print_value(cJSON *item,int depth,int fmt,printbuffer *p)
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{
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char *out=0;
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if (!item) return 0;
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switch ((item->type)&255)
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if (p)
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{
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case cJSON_NULL: out=cJSON_strdup("null"); break;
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case cJSON_False: out=cJSON_strdup("false");break;
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case cJSON_True: out=cJSON_strdup("true"); break;
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case cJSON_Number: out=print_number(item);break;
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case cJSON_String: out=print_string(item);break;
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case cJSON_Array: out=print_array(item,depth,fmt);break;
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case cJSON_Object: out=print_object(item,depth,fmt);break;
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switch ((item->type)&255)
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{
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case cJSON_NULL: {out=ensure(p,5); if (out) strcpy(out,"null"); break;}
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case cJSON_False: {out=ensure(p,6); if (out) strcpy(out,"false"); break;}
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case cJSON_True: {out=ensure(p,5); if (out) strcpy(out,"true"); break;}
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case cJSON_Number: out=print_number(item,p);break;
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case cJSON_String: out=print_string(item,p);break;
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case cJSON_Array: out=print_array(item,depth,fmt,p);break;
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case cJSON_Object: out=print_object(item,depth,fmt,p);break;
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}
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}
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else
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{
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switch ((item->type)&255)
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{
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case cJSON_NULL: out=cJSON_strdup("null"); break;
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case cJSON_False: out=cJSON_strdup("false");break;
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case cJSON_True: out=cJSON_strdup("true"); break;
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case cJSON_Number: out=print_number(item,0);break;
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case cJSON_String: out=print_string(item,0);break;
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case cJSON_Array: out=print_array(item,depth,fmt,0);break;
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case cJSON_Object: out=print_object(item,depth,fmt,0);break;
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}
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}
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return out;
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}
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@ -377,7 +441,7 @@ static const char *parse_array(cJSON *item,const char *value)
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}
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/* Render an array to text */
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static char *print_array(cJSON *item,int depth,int fmt)
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static char *print_array(cJSON *item,int depth,int fmt,printbuffer *p)
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{
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char **entries;
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char *out=0,*ptr,*ret;int len=5;
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@ -390,48 +454,69 @@ static char *print_array(cJSON *item,int depth,int fmt)
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/* Explicitly handle numentries==0 */
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if (!numentries)
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{
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out=(char*)cJSON_malloc(3);
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if (p) out=ensure(p,3);
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else out=(char*)cJSON_malloc(3);
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if (out) strcpy(out,"[]");
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return out;
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}
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/* Allocate an array to hold the values for each */
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entries=(char**)cJSON_malloc(numentries*sizeof(char*));
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if (!entries) return 0;
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memset(entries,0,numentries*sizeof(char*));
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/* Retrieve all the results: */
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child=item->child;
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while (child && !fail)
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if (p)
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{
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ret=print_value(child,depth+1,fmt);
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entries[i++]=ret;
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if (ret) len+=strlen(ret)+2+(fmt?1:0); else fail=1;
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child=child->next;
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/* Compose the output array. */
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i=p->offset;
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ptr=ensure(p,1);if (!ptr) return 0; *ptr='['; p->offset++;
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child=item->child;
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while (child && !fail)
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{
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print_value(child,depth+1,fmt,p);
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p->offset=update(p);
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if (child->next) {len=fmt?2:1;ptr=ensure(p,len+1);if (!ptr) return 0;*ptr++=',';if(fmt)*ptr++=' ';*ptr=0;p->offset+=len;}
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child=child->next;
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}
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ptr=ensure(p,2);if (!ptr) return 0; *ptr++=']';*ptr=0;
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out=(p->buffer)+i;
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}
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/* If we didn't fail, try to malloc the output string */
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if (!fail) out=(char*)cJSON_malloc(len);
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/* If that fails, we fail. */
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if (!out) fail=1;
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/* Handle failure. */
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if (fail)
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else
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{
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for (i=0;i<numentries;i++) if (entries[i]) cJSON_free(entries[i]);
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cJSON_free(entries);
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return 0;
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}
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/* Allocate an array to hold the values for each */
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entries=(char**)cJSON_malloc(numentries*sizeof(char*));
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if (!entries) return 0;
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memset(entries,0,numentries*sizeof(char*));
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/* Retrieve all the results: */
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child=item->child;
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while (child && !fail)
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{
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ret=print_value(child,depth+1,fmt,0);
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entries[i++]=ret;
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if (ret) len+=strlen(ret)+2+(fmt?1:0); else fail=1;
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child=child->next;
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}
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/* Compose the output array. */
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*out='[';
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ptr=out+1;*ptr=0;
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for (i=0;i<numentries;i++)
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{
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/* If we didn't fail, try to malloc the output string */
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if (!fail) out=(char*)cJSON_malloc(len);
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/* If that fails, we fail. */
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if (!out) fail=1;
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/* Handle failure. */
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if (fail)
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{
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for (i=0;i<numentries;i++) if (entries[i]) cJSON_free(entries[i]);
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cJSON_free(entries);
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return 0;
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}
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/* Compose the output array. */
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*out='[';
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ptr=out+1;*ptr=0;
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for (i=0;i<numentries;i++)
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{
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tmplen=strlen(entries[i]);memcpy(ptr,entries[i],tmplen);ptr+=tmplen;
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if (i!=numentries-1) {*ptr++=',';if(fmt)*ptr++=' ';*ptr=0;}
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cJSON_free(entries[i]);
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if (i!=numentries-1) {*ptr++=',';if(fmt)*ptr++=' ';*ptr=0;}
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cJSON_free(entries[i]);
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}
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cJSON_free(entries);
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*ptr++=']';*ptr++=0;
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}
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cJSON_free(entries);
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*ptr++=']';*ptr++=0;
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return out;
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}
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@ -472,7 +557,7 @@ static const char *parse_object(cJSON *item,const char *value)
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}
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/* Render an object to text. */
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static char *print_object(cJSON *item,int depth,int fmt)
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static char *print_object(cJSON *item,int depth,int fmt,printbuffer *p)
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{
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char **entries=0,**names=0;
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char *out=0,*ptr,*ret,*str;int len=7,i=0,j;
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@ -484,59 +569,101 @@ static char *print_object(cJSON *item,int depth,int fmt)
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/* Explicitly handle empty object case */
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if (!numentries)
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{
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out=(char*)cJSON_malloc(fmt?depth+4:3);
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if (p) out=ensure(p,fmt?depth+4:3);
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else out=(char*)cJSON_malloc(fmt?depth+4:3);
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if (!out) return 0;
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ptr=out;*ptr++='{';
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if (fmt) {*ptr++='\n';for (i=0;i<depth-1;i++) *ptr++='\t';}
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*ptr++='}';*ptr++=0;
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return out;
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}
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/* Allocate space for the names and the objects */
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entries=(char**)cJSON_malloc(numentries*sizeof(char*));
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if (!entries) return 0;
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names=(char**)cJSON_malloc(numentries*sizeof(char*));
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if (!names) {cJSON_free(entries);return 0;}
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memset(entries,0,sizeof(char*)*numentries);
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memset(names,0,sizeof(char*)*numentries);
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/* Collect all the results into our arrays: */
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child=item->child;depth++;if (fmt) len+=depth;
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while (child)
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if (p)
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{
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names[i]=str=print_string_ptr(child->string);
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entries[i++]=ret=print_value(child,depth,fmt);
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if (str && ret) len+=strlen(ret)+strlen(str)+2+(fmt?2+depth:0); else fail=1;
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child=child->next;
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/* Compose the output: */
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i=p->offset;
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len=fmt?2:1; ptr=ensure(p,len+1); if (!ptr) return 0;
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*ptr++='{'; if (fmt) *ptr++='\n'; *ptr=0; p->offset+=len;
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child=item->child;depth++;
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while (child)
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{
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if (fmt)
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{
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ptr=ensure(p,depth); if (!ptr) return 0;
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for (j=0;j<depth;j++) *ptr++='\t';
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p->offset+=depth;
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}
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print_string_ptr(child->string,p);
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p->offset=update(p);
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len=fmt?2:1;
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ptr=ensure(p,len); if (!ptr) return 0;
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*ptr++=':';if (fmt) *ptr++='\t';
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p->offset+=len;
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print_value(child,depth,fmt,p);
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p->offset=update(p);
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len=(fmt?1:0)+(child->next?1:0);
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ptr=ensure(p,len+1); if (!ptr) return 0;
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if (child->next) *ptr++=',';
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if (fmt) *ptr++='\n';*ptr=0;
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p->offset+=len;
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child=child->next;
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}
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ptr=ensure(p,fmt?(depth+1):2); if (!ptr) return 0;
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if (fmt) for (i=0;i<depth-1;i++) *ptr++='\t';
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*ptr++='}';*ptr=0;
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out=(p->buffer)+i;
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}
|
||||
|
||||
/* Try to allocate the output string */
|
||||
if (!fail) out=(char*)cJSON_malloc(len);
|
||||
if (!out) fail=1;
|
||||
|
||||
/* Handle failure */
|
||||
if (fail)
|
||||
else
|
||||
{
|
||||
for (i=0;i<numentries;i++) {if (names[i]) cJSON_free(names[i]);if (entries[i]) cJSON_free(entries[i]);}
|
||||
cJSON_free(names);cJSON_free(entries);
|
||||
return 0;
|
||||
}
|
||||
/* Allocate space for the names and the objects */
|
||||
entries=(char**)cJSON_malloc(numentries*sizeof(char*));
|
||||
if (!entries) return 0;
|
||||
names=(char**)cJSON_malloc(numentries*sizeof(char*));
|
||||
if (!names) {cJSON_free(entries);return 0;}
|
||||
memset(entries,0,sizeof(char*)*numentries);
|
||||
memset(names,0,sizeof(char*)*numentries);
|
||||
|
||||
/* Compose the output: */
|
||||
*out='{';ptr=out+1;if (fmt)*ptr++='\n';*ptr=0;
|
||||
for (i=0;i<numentries;i++)
|
||||
{
|
||||
if (fmt) for (j=0;j<depth;j++) *ptr++='\t';
|
||||
/* Collect all the results into our arrays: */
|
||||
child=item->child;depth++;if (fmt) len+=depth;
|
||||
while (child)
|
||||
{
|
||||
names[i]=str=print_string_ptr(child->string,0);
|
||||
entries[i++]=ret=print_value(child,depth,fmt,0);
|
||||
if (str && ret) len+=strlen(ret)+strlen(str)+2+(fmt?2+depth:0); else fail=1;
|
||||
child=child->next;
|
||||
}
|
||||
|
||||
/* Try to allocate the output string */
|
||||
if (!fail) out=(char*)cJSON_malloc(len);
|
||||
if (!out) fail=1;
|
||||
|
||||
/* Handle failure */
|
||||
if (fail)
|
||||
{
|
||||
for (i=0;i<numentries;i++) {if (names[i]) cJSON_free(names[i]);if (entries[i]) cJSON_free(entries[i]);}
|
||||
cJSON_free(names);cJSON_free(entries);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Compose the output: */
|
||||
*out='{';ptr=out+1;if (fmt)*ptr++='\n';*ptr=0;
|
||||
for (i=0;i<numentries;i++)
|
||||
{
|
||||
if (fmt) for (j=0;j<depth;j++) *ptr++='\t';
|
||||
tmplen=strlen(names[i]);memcpy(ptr,names[i],tmplen);ptr+=tmplen;
|
||||
*ptr++=':';if (fmt) *ptr++='\t';
|
||||
strcpy(ptr,entries[i]);ptr+=strlen(entries[i]);
|
||||
if (i!=numentries-1) *ptr++=',';
|
||||
if (fmt) *ptr++='\n';*ptr=0;
|
||||
cJSON_free(names[i]);cJSON_free(entries[i]);
|
||||
}
|
||||
*ptr++=':';if (fmt) *ptr++='\t';
|
||||
strcpy(ptr,entries[i]);ptr+=strlen(entries[i]);
|
||||
if (i!=numentries-1) *ptr++=',';
|
||||
if (fmt) *ptr++='\n';*ptr=0;
|
||||
cJSON_free(names[i]);cJSON_free(entries[i]);
|
||||
}
|
||||
|
||||
cJSON_free(names);cJSON_free(entries);
|
||||
if (fmt) for (i=0;i<depth-1;i++) *ptr++='\t';
|
||||
*ptr++='}';*ptr++=0;
|
||||
cJSON_free(names);cJSON_free(entries);
|
||||
if (fmt) for (i=0;i<depth-1;i++) *ptr++='\t';
|
||||
*ptr++='}';*ptr++=0;
|
||||
}
|
||||
return out;
|
||||
}
|
||||
|
||||
@ -553,6 +680,7 @@ static cJSON *create_reference(cJSON *item) {cJSON *ref=cJSON_New_Item();if (!re
|
||||
/* Add item to array/object. */
|
||||
void cJSON_AddItemToArray(cJSON *array, cJSON *item) {cJSON *c=array->child;if (!item) return; if (!c) {array->child=item;} else {while (c && c->next) c=c->next; suffix_object(c,item);}}
|
||||
void cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item) {if (!item) return; if (item->string) cJSON_free(item->string);item->string=cJSON_strdup(string);cJSON_AddItemToArray(object,item);}
|
||||
void cJSON_AddItemToObjectCS(cJSON *object,const char *string,cJSON *item) {if (!item) return; if (!(item->type&cJSON_StringIsConst) && item->string) cJSON_free(item->string);item->string=(char*)string;item->type|=cJSON_StringIsConst;cJSON_AddItemToArray(object,item);}
|
||||
void cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item) {cJSON_AddItemToArray(array,create_reference(item));}
|
||||
void cJSON_AddItemReferenceToObject(cJSON *object,const char *string,cJSON *item) {cJSON_AddItemToObject(object,string,create_reference(item));}
|
||||
|
||||
|
||||
4
cJSON.h
4
cJSON.h
@ -38,6 +38,7 @@ extern "C"
|
||||
#define cJSON_Object 6
|
||||
|
||||
#define cJSON_IsReference 256
|
||||
#define cJSON_StringIsConst 512
|
||||
|
||||
/* The cJSON structure: */
|
||||
typedef struct cJSON {
|
||||
@ -68,6 +69,8 @@ extern cJSON *cJSON_Parse(const char *value);
|
||||
extern char *cJSON_Print(cJSON *item);
|
||||
/* Render a cJSON entity to text for transfer/storage without any formatting. Free the char* when finished. */
|
||||
extern char *cJSON_PrintUnformatted(cJSON *item);
|
||||
/* Render a cJSON entity to text using a buffered strategy. prebuffer is a guess at the final size. guessing well reduces reallocation. fmt=0 gives unformatted, =1 gives formatted */
|
||||
extern char *cJSON_PrintBuffered(cJSON *item,int prebuffer,int fmt);
|
||||
/* Delete a cJSON entity and all subentities. */
|
||||
extern void cJSON_Delete(cJSON *c);
|
||||
|
||||
@ -100,6 +103,7 @@ extern cJSON *cJSON_CreateStringArray(const char **strings,int count);
|
||||
/* Append item to the specified array/object. */
|
||||
extern void cJSON_AddItemToArray(cJSON *array, cJSON *item);
|
||||
extern void cJSON_AddItemToObject(cJSON *object,const char *string,cJSON *item);
|
||||
extern void cJSON_AddItemToObjectCS(cJSON *object,const char *string,cJSON *item); /* Use this when string is definitely const (i.e. a literal, or as good as), and will definitely survive the cJSON object */
|
||||
/* Append reference to item to the specified array/object. Use this when you want to add an existing cJSON to a new cJSON, but don't want to corrupt your existing cJSON. */
|
||||
extern void cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
|
||||
extern void cJSON_AddItemReferenceToObject(cJSON *object,const char *string,cJSON *item);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user