/*
* Copyright (c) 2009-2013 Petri Lehtinen <petri@digip.org>
*
* Jansson is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "jansson.h"
#include "jansson_private.h"
#include "strbuffer.h"
#include "utf.h"
#define MAX_INTEGER_STR_LENGTH 100
#define MAX_REAL_STR_LENGTH 100
struct object_key {
size_t serial;
const char *key;
};
static int dump_to_strbuffer(const char *buffer, size_t size, void *data)
{
return strbuffer_append_bytes((strbuffer_t *)data, buffer, size);
}
static int dump_to_file(const char *buffer, size_t size, void *data)
{
FILE *dest = (FILE *)data;
if(fwrite(buffer, size, 1, dest) != 1)
return -1;
return 0;
}
/* 32 spaces (the maximum indentation size) */
static const char whitespace[] = " ";
static int dump_indent(size_t flags, int depth, int space, json_dump_callback_t dump, void *data)
{
if(JSON_INDENT(flags) > 0)
{
int i, ws_count = JSON_INDENT(flags);
if(dump("\n", 1, data))
return -1;
for(i = 0; i < depth; i++)
{
if(dump(whitespace, ws_count, data))
return -1;
}
}
else if(space && !(flags & JSON_COMPACT))
{
return dump(" ", 1, data);
}
return 0;
}
static int dump_string(const char *str, json_dump_callback_t dump, void *data, size_t flags)
{
const char *pos, *end;
int32_t codepoint;
if(dump("\"", 1, data))
return -1;
end = pos = str;
while(1)
{
const char *text;
char seq[13];
int length;
while(*end)
{
end = utf8_iterate(pos, &codepoint);
if(!end)
return -1;
/* mandatory escape or control char */
if(codepoint == '\\' || codepoint == '"' || codepoint < 0x20)
break;
/* slash */
if((flags & JSON_ESCAPE_SLASH) && codepoint == '/')
break;
/* non-ASCII */
if((flags & JSON_ENSURE_ASCII) && codepoint > 0x7F)
break;
pos = end;
}
if(pos != str) {
if(dump(str, pos - str, data))
return -1;
}
if(end == pos)
break;
/* handle \, /, ", and control codes */
length = 2;
switch(codepoint)
{
case '\\': text = "\\\\"; break;
case '\"': text = "\\\""; break;
case '\b': text = "\\b"; break;
case '\f': text = "\\f"; break;
case '\n': text = "\\n"; break;
case '\r': text = "\\r"; break;
case '\t': text = "\\t"; break;
case '/': text = "\\/"; break;
default:
{
/* codepoint is in BMP */
if(codepoint < 0x10000)
{
sprintf(seq, "\\u%04x", codepoint);
length = 6;
}
/* not in BMP -> construct a UTF-16 surrogate pair */
else
{
int32_t first, last;
codepoint -= 0x10000;
first = 0xD800 | ((codepoint & 0xffc00) >> 10);
last = 0xDC00 | (codepoint & 0x003ff);
sprintf(seq, "\\u%04x\\u%04x", first, last);
length = 12;
}
text = seq;
break;
}
}
if(dump(text, length, data))
return -1;
str = pos = end;
}
return dump("\"", 1, data);
}
static int object_key_compare_keys(const void *key1, const void *key2)
{
return strcmp(((const struct object_key *)key1)->key,
((const struct object_key *)key2)->key);
}
static int object_key_compare_serials(const void *key1, const void *key2)
{
size_t a = ((const struct object_key *)key1)->serial;
size_t b = ((const struct object_key *)key2)->serial;
return a < b ? -1 : a == b ? 0 : 1;
}
static int do_dump(const json_t *json, size_t flags, int depth,
json_dump_callback_t dump, void *data)
{
if(!json)
return -1;
switch(json_typeof(json)) {
case JSON_NULL:
return dump("null", 4, data);
case JSON_TRUE:
return dump("true", 4, data);
case JSON_FALSE:
return dump("false", 5, data);
case JSON_INTEGER:
{
char buffer[MAX_INTEGER_STR_LENGTH];
int size;
size = snprintf(buffer, MAX_INTEGER_STR_LENGTH,
"%" JSON_INTEGER_FORMAT,
json_integer_value(json));
if(size < 0 || size >= MAX_INTEGER_STR_LENGTH)
return -1;
return dump(buffer, size, data);
}
case JSON_REAL:
{
char buffer[MAX_REAL_STR_LENGTH];
int size;
double value = json_real_value(json);
size = jsonp_dtostr(buffer, MAX_REAL_STR_LENGTH, value);
if(size < 0)
return -1;
return dump(buffer, size, data);
}
case JSON_STRING:
return dump_string(json_string_value(json), dump, data, flags);
case JSON_ARRAY:
{
int i;
int n;
json_array_t *array;
/* detect circular references */
array = json_to_array(json);
if(array->visited)
goto array_error;
array->visited = 1;
n = json_array_size(json);
if(dump("[", 1, data))
goto array_error;
if(n == 0) {
array->visited = 0;
return dump("]", 1, data);
}
if(dump_indent(flags, depth + 1, 0, dump, data))
goto array_error;
for(i = 0; i < n; ++i) {
if(do_dump(json_array_get(json, i), flags, depth + 1,
dump, data))
goto array_error;
if(i < n - 1)
{
if(dump(",", 1, data) ||
dump_indent(flags, depth + 1, 1, dump, data))
goto array_error;
}
else
{
if(dump_indent(flags, depth, 0, dump, data))
goto array_error;
}
}
array->visited = 0;
return dump("]", 1, data);
array_error:
array->visited = 0;
return -1;
}
case JSON_OBJECT:
{
json_object_t *object;
void *iter;
const char *separator;
int separator_length;
if(flags & JSON_COMPACT) {
separator = ":";
separator_length = 1;
}
else {
separator = ": ";
separator_length = 2;
}
/* detect circular references */
object = json_to_object(json);
if(object->visited)
goto object_error;
object->visited = 1;
iter = json_object_iter((json_t *)json);
if(dump("{", 1, data))
goto object_error;
if(!iter) {
object->visited = 0;
return dump("}", 1, data);
}
if(dump_indent(flags, depth + 1, 0, dump, data))
goto object_error;
if(flags & JSON_SORT_KEYS || flags & JSON_PRESERVE_ORDER)
{
struct object_key *keys;
size_t size, i;
int (*cmp_func)(const void *, const void *);
size = json_object_size(json);
keys = jsonp_malloc(size * sizeof(struct object_key));
if(!keys)
goto object_error;
i = 0;
while(iter)
{
keys[i].serial = hashtable_iter_serial(iter);
keys[i].key = json_object_iter_key(iter);
iter = json_object_iter_next((json_t *)json, iter);
i++;
}
assert(i == size);
if(flags & JSON_SORT_KEYS)
cmp_func = object_key_compare_keys;
else
cmp_func = object_key_compare_serials;
qsort(keys, size, sizeof(struct object_key), cmp_func);
for(i = 0; i < size; i++)
{
const char *key;
json_t *value;
key = keys[i].key;
value = json_object_get(json, key);
assert(value);
dump_string(key, dump, data, flags);
if(dump(separator, separator_length, data) ||
do_dump(value, flags, depth + 1, dump, data))
{
jsonp_free(keys);
goto object_error;
}
if(i < size - 1)
{
if(dump(",", 1, data) ||
dump_indent(flags, depth + 1, 1, dump, data))
{
jsonp_free(keys);
goto object_error;
}
}
else
{
if(dump_indent(flags, depth, 0, dump, data))
{
jsonp_free(keys);
goto object_error;
}
}
}
jsonp_free(keys);
}
else
{
/* Don't sort keys */
while(iter)
{
void *next = json_object_iter_next((json_t *)json, iter);
dump_string(json_object_iter_key(iter), dump, data, flags);
if(dump(separator, separator_length, data) ||
do_dump(json_object_iter_value(iter), flags, depth + 1,
dump, data))
goto object_error;
if(next)
{
if(dump(",", 1, data) ||
dump_indent(flags, depth + 1, 1, dump, data))
goto object_error;
}
else
{
if(dump_indent(flags, depth, 0, dump, data))
goto object_error;
}
iter = next;
}
}
object->visited = 0;
return dump("}", 1, data);
object_error:
object->visited = 0;
return -1;
}
default:
/* not reached */
return -1;
}
}
char *json_dumps(const json_t *json, size_t flags)
{
strbuffer_t strbuff;
char *result;
if(strbuffer_init(&strbuff))
return NULL;
if(json_dump_callback(json, dump_to_strbuffer, (void *)&strbuff, flags))
result = NULL;
else
result = jsonp_strdup(strbuffer_value(&strbuff));
strbuffer_close(&strbuff);
return result;
}
int json_dumpf(const json_t *json, FILE *output, size_t flags)
{
return json_dump_callback(json, dump_to_file, (void *)output, flags);
}
int json_dump_file(const json_t *json, const char *path, size_t flags)
{
int result;
FILE *output = fopen(path, "w");
if(!output)
return -1;
result = json_dumpf(json, output, flags);
fclose(output);
return result;
}
int json_dump_callback(const json_t *json, json_dump_callback_t callback, void *data, size_t flags)
{
if(!(flags & JSON_ENCODE_ANY)) {
if(!json_is_array(json) && !json_is_object(json))
return -1;
}
return do_dump(json, flags, 0, callback, data);
}
