telodendria/src/CanonicalJson.c

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/*
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* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
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* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
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#include <CanonicalJson.h>
#include <HashMap.h>
#include <Array.h>
#include <Json.h>
#include <stdio.h>
#include <string.h>
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static int
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CanonicalJsonKeyCompare(void *k1, void *k2)
{
return strcmp((char *) k1, (char *) k2);
}
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int
CanonicalJsonEncodeValue(JsonValue * value, Stream * out)
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{
Array *arr;
size_t i, len;
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int length = 0;
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/* Override object type to encode using the canonical functions */
switch (JsonValueType(value))
{
case JSON_OBJECT:
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length += CanonicalJsonEncode(JsonValueAsObject(value), out);
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break;
case JSON_ARRAY:
arr = JsonValueAsArray(value);
len = ArraySize(arr);
StreamPutc(out, '[');
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length++;
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for (i = 0; i < len; i++)
{
JsonValue *aVal = ArrayGet(arr, i);
if (JsonValueType(aVal) == JSON_FLOAT)
{
/* See comment in CanonicalJsonEncode() */
continue;
}
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length += CanonicalJsonEncodeValue(aVal, out);
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if (i < len - 1)
{
StreamPutc(out, ',');
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length++;
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}
}
StreamPutc(out, ']');
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length++;
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break;
default:
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length += JsonEncodeValue(value, out, JSON_DEFAULT);
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break;
}
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return length;
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}
int
CanonicalJsonEncode(HashMap * object, Stream * out)
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{
char *key;
JsonValue *value;
Array *keys;
size_t i;
size_t keyCount;
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int length;
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if (!object)
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{
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return -1;
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}
keys = ArrayCreate();
if (!keys)
{
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return -1;
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}
while (HashMapIterate(object, &key, (void **) &value))
{
ArrayAdd(keys, key);
}
ArraySort(keys, CanonicalJsonKeyCompare);
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/* The total number of bytes written */
length = 0;
StreamPutc(out, '{');
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length++;
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keyCount = ArraySize(keys);
for (i = 0; i < keyCount; i++)
{
key = (char *) ArrayGet(keys, i);
value = (JsonValue *) HashMapGet(object, key);
if (JsonValueType(value) == JSON_FLOAT)
{
/*
* "INFO: Float values are not permitted by this encoding."
*
* The spec doesn't say how a canonical JSON generator should
* handle float values, but given that it is highly unlikely
* that we will ever be using float values, it shouldn't be
* an issue if we just skip keys that have float values
* altogether.
*/
continue;
}
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length += JsonEncodeString(key, out);
StreamPutc(out, ':');
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length++;
length += CanonicalJsonEncodeValue(value, out);
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if (i < keyCount - 1)
{
StreamPutc(out, ',');
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length++;
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}
}
StreamPutc(out, '}');
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length++;
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ArrayFree(keys);
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return length;
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}