461 lines
12 KiB
C
461 lines
12 KiB
C
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/*
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* Copyright (c) 2009, 2010 Petri Lehtinen <petri@digip.org>
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*
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* Jansson is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <jansson.h>
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#include "jansson_private.h"
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#include "strbuffer.h"
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#include "utf.h"
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#define MAX_INTEGER_STR_LENGTH 100
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#define MAX_REAL_STR_LENGTH 100
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typedef int (*dump_func)(const char *buffer, int size, void *data);
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struct string
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{
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char *buffer;
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int length;
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int size;
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};
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static int dump_to_strbuffer(const char *buffer, int size, void *data)
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{
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return strbuffer_append_bytes((strbuffer_t *)data, buffer, size);
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}
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static int dump_to_file(const char *buffer, int size, void *data)
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{
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FILE *dest = (FILE *)data;
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if(fwrite(buffer, size, 1, dest) != 1)
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return -1;
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return 0;
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}
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/* 256 spaces (the maximum indentation size) */
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static char whitespace[] = " ";
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static int dump_indent(unsigned long flags, int depth, int space, dump_func dump, void *data)
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{
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if(JSON_INDENT(flags) > 0)
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{
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int i, ws_count = JSON_INDENT(flags);
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if(dump("\n", 1, data))
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return -1;
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for(i = 0; i < depth; i++)
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{
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if(dump(whitespace, ws_count, data))
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return -1;
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}
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}
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else if(space && !(flags & JSON_COMPACT))
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{
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return dump(" ", 1, data);
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}
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return 0;
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}
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static int dump_string(const char *str, int ascii, dump_func dump, void *data)
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{
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const char *pos, *end;
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int32_t codepoint;
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if(dump("\"", 1, data))
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return -1;
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end = pos = str;
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while(1)
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{
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const char *text;
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char seq[13];
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int length;
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while(*end)
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{
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end = utf8_iterate(pos, &codepoint);
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if(!end)
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return -1;
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/* mandatory escape or control char */
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if(codepoint == '\\' || codepoint == '"' || codepoint < 0x20)
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break;
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/* non-ASCII */
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if(ascii && codepoint > 0x7F)
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break;
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pos = end;
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}
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if(pos != str) {
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if(dump(str, pos - str, data))
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return -1;
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}
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if(end == pos)
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break;
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/* handle \, ", and control codes */
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length = 2;
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switch(codepoint)
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{
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case '\\': text = "\\\\"; break;
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case '\"': text = "\\\""; break;
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case '\b': text = "\\b"; break;
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case '\f': text = "\\f"; break;
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case '\n': text = "\\n"; break;
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case '\r': text = "\\r"; break;
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case '\t': text = "\\t"; break;
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default:
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{
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/* codepoint is in BMP */
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if(codepoint < 0x10000)
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{
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sprintf(seq, "\\u%04x", codepoint);
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length = 6;
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}
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/* not in BMP -> construct a UTF-16 surrogate pair */
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else
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{
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int32_t first, last;
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codepoint -= 0x10000;
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first = 0xD800 | ((codepoint & 0xffc00) >> 10);
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last = 0xDC00 | (codepoint & 0x003ff);
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sprintf(seq, "\\u%04x\\u%04x", first, last);
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length = 12;
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}
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text = seq;
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break;
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}
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}
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if(dump(text, length, data))
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return -1;
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str = pos = end;
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}
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return dump("\"", 1, data);
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}
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static int object_key_compare_keys(const void *key1, const void *key2)
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{
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return strcmp((*(const object_key_t **)key1)->key,
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(*(const object_key_t **)key2)->key);
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}
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static int object_key_compare_serials(const void *key1, const void *key2)
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{
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return (*(const object_key_t **)key1)->serial -
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(*(const object_key_t **)key2)->serial;
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}
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static int do_dump(const json_t *json, unsigned long flags, int depth,
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dump_func dump, void *data)
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{
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int ascii = flags & JSON_ENSURE_ASCII ? 1 : 0;
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switch(json_typeof(json)) {
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case JSON_NULL:
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return dump("null", 4, data);
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case JSON_TRUE:
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return dump("true", 4, data);
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case JSON_FALSE:
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return dump("false", 5, data);
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case JSON_INTEGER:
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{
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char buffer[MAX_INTEGER_STR_LENGTH];
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int size;
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size = snprintf(buffer, MAX_INTEGER_STR_LENGTH, "%d", json_integer_value(json));
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if(size >= MAX_INTEGER_STR_LENGTH)
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return -1;
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return dump(buffer, size, data);
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}
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case JSON_REAL:
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{
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char buffer[MAX_REAL_STR_LENGTH];
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int size;
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size = snprintf(buffer, MAX_REAL_STR_LENGTH, "%.17g",
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json_real_value(json));
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if(size >= MAX_REAL_STR_LENGTH)
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return -1;
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/* Make sure there's a dot or 'e' in the output. Otherwise
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a real is converted to an integer when decoding */
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if(strchr(buffer, '.') == NULL &&
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strchr(buffer, 'e') == NULL)
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{
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if(size + 2 >= MAX_REAL_STR_LENGTH) {
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/* No space to append ".0" */
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return -1;
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}
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buffer[size] = '.';
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buffer[size + 1] = '0';
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size += 2;
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}
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return dump(buffer, size, data);
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}
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case JSON_STRING:
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return dump_string(json_string_value(json), ascii, dump, data);
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case JSON_ARRAY:
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{
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int i;
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int n;
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json_array_t *array;
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/* detect circular references */
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array = json_to_array(json);
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if(array->visited)
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goto array_error;
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array->visited = 1;
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n = json_array_size(json);
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if(dump("[", 1, data))
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goto array_error;
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if(n == 0) {
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array->visited = 0;
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return dump("]", 1, data);
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}
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if(dump_indent(flags, depth + 1, 0, dump, data))
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goto array_error;
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for(i = 0; i < n; ++i) {
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if(do_dump(json_array_get(json, i), flags, depth + 1,
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dump, data))
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goto array_error;
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if(i < n - 1)
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{
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if(dump(",", 1, data) ||
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dump_indent(flags, depth + 1, 1, dump, data))
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goto array_error;
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}
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else
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{
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if(dump_indent(flags, depth, 0, dump, data))
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goto array_error;
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}
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}
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array->visited = 0;
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return dump("]", 1, data);
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array_error:
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array->visited = 0;
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return -1;
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}
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case JSON_OBJECT:
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{
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json_object_t *object;
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void *iter;
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const char *separator;
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int separator_length;
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if(flags & JSON_COMPACT) {
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separator = ":";
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separator_length = 1;
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}
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else {
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separator = ": ";
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separator_length = 2;
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}
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/* detect circular references */
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object = json_to_object(json);
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if(object->visited)
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goto object_error;
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object->visited = 1;
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iter = json_object_iter((json_t *)json);
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if(dump("{", 1, data))
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goto object_error;
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if(!iter) {
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object->visited = 0;
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return dump("}", 1, data);
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}
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if(dump_indent(flags, depth + 1, 0, dump, data))
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goto object_error;
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if(flags & JSON_SORT_KEYS || flags & JSON_PRESERVE_ORDER)
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{
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const object_key_t **keys;
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unsigned int size;
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unsigned int i;
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int (*cmp_func)(const void *, const void *);
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size = json_object_size(json);
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keys = malloc(size * sizeof(object_key_t *));
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if(!keys)
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goto object_error;
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i = 0;
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while(iter)
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{
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keys[i] = jsonp_object_iter_fullkey(iter);
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iter = json_object_iter_next((json_t *)json, iter);
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i++;
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}
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assert(i == size);
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if(flags & JSON_SORT_KEYS)
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cmp_func = object_key_compare_keys;
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else
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cmp_func = object_key_compare_serials;
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qsort(keys, size, sizeof(object_key_t *), cmp_func);
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for(i = 0; i < size; i++)
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{
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const char *key;
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json_t *value;
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key = keys[i]->key;
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value = json_object_get(json, key);
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assert(value);
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dump_string(key, ascii, dump, data);
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if(dump(separator, separator_length, data) ||
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do_dump(value, flags, depth + 1, dump, data))
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{
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free(keys);
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goto object_error;
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}
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if(i < size - 1)
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{
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if(dump(",", 1, data) ||
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dump_indent(flags, depth + 1, 1, dump, data))
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{
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free(keys);
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goto object_error;
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}
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}
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else
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{
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if(dump_indent(flags, depth, 0, dump, data))
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{
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free(keys);
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goto object_error;
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}
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}
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}
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free(keys);
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}
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else
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{
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/* Don't sort keys */
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while(iter)
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{
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void *next = json_object_iter_next((json_t *)json, iter);
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dump_string(json_object_iter_key(iter), ascii, dump, data);
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if(dump(separator, separator_length, data) ||
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do_dump(json_object_iter_value(iter), flags, depth + 1,
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dump, data))
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goto object_error;
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if(next)
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{
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if(dump(",", 1, data) ||
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dump_indent(flags, depth + 1, 1, dump, data))
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goto object_error;
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}
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else
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{
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if(dump_indent(flags, depth, 0, dump, data))
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goto object_error;
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}
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iter = next;
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}
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}
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object->visited = 0;
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return dump("}", 1, data);
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object_error:
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object->visited = 0;
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return -1;
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}
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default:
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/* not reached */
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return -1;
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}
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}
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char *json_dumps(const json_t *json, unsigned long flags)
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{
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|
strbuffer_t strbuff;
|
||
|
|
char *result;
|
||
|
|
|
||
|
|
if(!json_is_array(json) && !json_is_object(json))
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
if(strbuffer_init(&strbuff))
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
if(do_dump(json, flags, 0, dump_to_strbuffer, (void *)&strbuff)) {
|
||
|
|
strbuffer_close(&strbuff);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
result = strdup(strbuffer_value(&strbuff));
|
||
|
|
strbuffer_close(&strbuff);
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
int json_dumpf(const json_t *json, FILE *output, unsigned long flags)
|
||
|
|
{
|
||
|
|
if(!json_is_array(json) && !json_is_object(json))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
return do_dump(json, flags, 0, dump_to_file, (void *)output);
|
||
|
|
}
|
||
|
|
|
||
|
|
int json_dump_file(const json_t *json, const char *path, unsigned long flags)
|
||
|
|
{
|
||
|
|
int result;
|
||
|
|
|
||
|
|
FILE *output = fopen(path, "w");
|
||
|
|
if(!output)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
result = json_dumpf(json, output, flags);
|
||
|
|
|
||
|
|
fclose(output);
|
||
|
|
return result;
|
||
|
|
}
|