Add canonical Json implementation.

This commit is contained in:
Jordan Bancino 2022-07-27 17:28:05 -04:00
parent c143136097
commit 6b8d0f6d5f
2 changed files with 133 additions and 0 deletions

122
src/CanonicalJson.c Normal file
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#include <CanonicalJson.h>
#include <HashMap.h>
#include <Array.h>
#include <Json.h>
#include <stdio.h>
#include <string.h>
int
CanonicalJsonKeyCompare(void *k1, void *k2)
{
return strcmp((char *) k1, (char *) k2);
}
static void
CanonicalJsonEncodeValue(JsonValue * value, FILE * out)
{
Array *arr;
size_t i, len;
/* Override object type to encode using the canonical functions */
switch (JsonValueType(value))
{
case JSON_OBJECT:
CanonicalJsonEncode(JsonValueAsObject(value), out);
break;
case JSON_ARRAY:
arr = JsonValueAsArray(value);
len = ArraySize(arr);
fputc('[', out);
for (i = 0; i < len; i++)
{
JsonValue *aVal = ArrayGet(arr, i);
if (JsonValueType(aVal) == JSON_FLOAT)
{
/* See comment in CanonicalJsonEncode() */
continue;
}
CanonicalJsonEncodeValue(aVal, out);
if (i < len - 1)
{
fputc(',', out);
}
}
fputc(']', out);
break;
default:
JsonEncodeValue(value, out);
break;
}
}
int
CanonicalJsonEncode(HashMap * object, FILE * out)
{
char *key;
JsonValue *value;
Array *keys;
size_t i;
size_t keyCount;
if (!object || !out)
{
return 0;
}
keys = ArrayCreate();
if (!keys)
{
return 0;
}
while (HashMapIterate(object, &key, (void **) &value))
{
ArrayAdd(keys, key);
}
ArraySort(keys, CanonicalJsonKeyCompare);
fputc('{', out);
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;
}
JsonEncodeString(key, out);
fputc(':', out);
CanonicalJsonEncodeValue(value, out);
if (i < keyCount - 1)
{
fputc(',', out);
}
}
fputc('}', out);
ArrayFree(keys);
return 1;
}

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#ifndef TELODENDRIA_CANONICALJSON_H
#define TELODENDRIA_CANONICALJSON_H
#include <stdio.h>
#include <HashMap.h>
extern int
CanonicalJsonEncode(HashMap * object, FILE * out);
#endif