497 lines
13 KiB
C
497 lines
13 KiB
C
/*
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* Copyright (c) 2009-2016 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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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include "jansson_private.h"
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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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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "jansson.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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#define FLAGS_TO_INDENT(f) ((f) & 0x1F)
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#define FLAGS_TO_PRECISION(f) (((f) >> 11) & 0x1F)
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struct buffer {
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const size_t size;
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size_t used;
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char *data;
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};
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static int dump_to_strbuffer(const char *buffer, size_t 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_buffer(const char *buffer, size_t size, void *data)
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{
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struct buffer *buf = (struct buffer *)data;
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if(buf->used + size <= buf->size)
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memcpy(&buf->data[buf->used], buffer, size);
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buf->used += size;
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return 0;
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}
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static int dump_to_file(const char *buffer, size_t 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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static int dump_to_fd(const char *buffer, size_t size, void *data)
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{
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int *dest = (int *)data;
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#ifdef HAVE_UNISTD_H
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if(write(*dest, buffer, size) == (ssize_t)size)
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return 0;
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#endif
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return -1;
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}
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/* 32 spaces (the maximum indentation size) */
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static const char whitespace[] = " ";
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static int dump_indent(size_t flags, int depth, int space, json_dump_callback_t dump, void *data)
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{
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if(FLAGS_TO_INDENT(flags) > 0)
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{
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unsigned int ws_count = FLAGS_TO_INDENT(flags), n_spaces = depth * ws_count;
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if(dump("\n", 1, data))
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return -1;
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while(n_spaces > 0)
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{
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int cur_n = n_spaces < sizeof whitespace - 1 ? n_spaces : sizeof whitespace - 1;
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if(dump(whitespace, cur_n, data))
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return -1;
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n_spaces -= cur_n;
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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, size_t len, json_dump_callback_t dump, void *data, size_t flags)
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{
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const char *pos, *end, *lim;
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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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lim = str + len;
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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 < lim)
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{
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end = utf8_iterate(pos, lim - 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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/* slash */
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if((flags & JSON_ESCAPE_SLASH) && codepoint == '/')
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break;
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/* non-ASCII */
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if((flags & JSON_ENSURE_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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case '/': text = "\\/"; 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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snprintf(seq, sizeof(seq), "\\u%04X", (unsigned int)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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snprintf(seq, sizeof(seq), "\\u%04X\\u%04X", (unsigned int)first, (unsigned int)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 compare_keys(const void *key1, const void *key2)
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{
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return strcmp(*(const char **)key1, *(const char **)key2);
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}
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static int do_dump(const json_t *json, size_t flags, int depth,
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json_dump_callback_t dump, void *data)
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{
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int embed = flags & JSON_EMBED;
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flags &= ~JSON_EMBED;
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if(!json)
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return -1;
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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,
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"%" JSON_INTEGER_FORMAT,
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json_integer_value(json));
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if(size < 0 || 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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double value = json_real_value(json);
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size = jsonp_dtostr(buffer, MAX_REAL_STR_LENGTH, value,
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FLAGS_TO_PRECISION(flags));
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if(size < 0)
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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_STRING:
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return dump_string(json_string_value(json), json_string_length(json), dump, data, flags);
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case JSON_ARRAY:
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{
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size_t n;
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size_t i;
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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(!embed && 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 embed ? 0 : 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 embed ? 0 : 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(!embed && 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 embed ? 0 : 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)
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{
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const char **keys;
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size_t size, i;
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size = json_object_size(json);
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keys = jsonp_malloc(size * sizeof(const char *));
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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] = json_object_iter_key(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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qsort(keys, size, sizeof(const char *), compare_keys);
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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];
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value = json_object_get(json, key);
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assert(value);
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dump_string(key, strlen(key), dump, data, flags);
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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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jsonp_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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jsonp_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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jsonp_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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jsonp_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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const char *key = json_object_iter_key(iter);
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dump_string(key, strlen(key), dump, data, flags);
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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 embed ? 0 : 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, size_t flags)
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{
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strbuffer_t strbuff;
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char *result;
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if(strbuffer_init(&strbuff))
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return NULL;
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if(json_dump_callback(json, dump_to_strbuffer, (void *)&strbuff, flags))
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result = NULL;
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else
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result = jsonp_strdup(strbuffer_value(&strbuff));
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strbuffer_close(&strbuff);
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return result;
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}
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size_t json_dumpb(const json_t *json, char *buffer, size_t size, size_t flags)
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{
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struct buffer buf = { size, 0, buffer };
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if(json_dump_callback(json, dump_to_buffer, (void *)&buf, flags))
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return 0;
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return buf.used;
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}
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int json_dumpf(const json_t *json, FILE *output, size_t flags)
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{
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return json_dump_callback(json, dump_to_file, (void *)output, flags);
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}
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int json_dumpfd(const json_t *json, int output, size_t flags)
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{
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return json_dump_callback(json, dump_to_fd, (void *)&output, flags);
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}
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int json_dump_file(const json_t *json, const char *path, size_t flags)
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{
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int result;
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FILE *output = fopen(path, "w");
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if(!output)
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return -1;
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result = json_dumpf(json, output, flags);
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fclose(output);
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return result;
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}
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int json_dump_callback(const json_t *json, json_dump_callback_t callback, void *data, size_t flags)
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{
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if(!(flags & JSON_ENCODE_ANY)) {
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if(!json_is_array(json) && !json_is_object(json))
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return -1;
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}
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return do_dump(json, flags, 0, callback, data);
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}
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