forked from Telodendria/Telodendria
Add canonical Json implementation.
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2 changed files with 133 additions and 0 deletions
122
src/CanonicalJson.c
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122
src/CanonicalJson.c
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#include <CanonicalJson.h>
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#include <HashMap.h>
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#include <Array.h>
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#include <Json.h>
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#include <stdio.h>
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#include <string.h>
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int
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CanonicalJsonKeyCompare(void *k1, void *k2)
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{
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return strcmp((char *) k1, (char *) k2);
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}
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static void
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CanonicalJsonEncodeValue(JsonValue * value, FILE * out)
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{
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Array *arr;
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size_t i, len;
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/* Override object type to encode using the canonical functions */
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switch (JsonValueType(value))
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{
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case JSON_OBJECT:
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CanonicalJsonEncode(JsonValueAsObject(value), out);
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break;
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case JSON_ARRAY:
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arr = JsonValueAsArray(value);
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len = ArraySize(arr);
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fputc('[', out);
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for (i = 0; i < len; i++)
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{
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JsonValue *aVal = ArrayGet(arr, i);
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if (JsonValueType(aVal) == JSON_FLOAT)
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{
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/* See comment in CanonicalJsonEncode() */
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continue;
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}
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CanonicalJsonEncodeValue(aVal, out);
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if (i < len - 1)
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{
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fputc(',', out);
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}
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}
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fputc(']', out);
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break;
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default:
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JsonEncodeValue(value, out);
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break;
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}
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}
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int
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CanonicalJsonEncode(HashMap * object, FILE * out)
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{
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char *key;
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JsonValue *value;
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Array *keys;
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size_t i;
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size_t keyCount;
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if (!object || !out)
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{
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return 0;
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}
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keys = ArrayCreate();
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if (!keys)
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{
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return 0;
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}
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while (HashMapIterate(object, &key, (void **) &value))
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{
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ArrayAdd(keys, key);
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}
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ArraySort(keys, CanonicalJsonKeyCompare);
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fputc('{', out);
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keyCount = ArraySize(keys);
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for (i = 0; i < keyCount; i++)
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{
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key = (char *) ArrayGet(keys, i);
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value = (JsonValue *) HashMapGet(object, key);
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if (JsonValueType(value) == JSON_FLOAT)
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{
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/*
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* "INFO: Float values are not permitted by this encoding."
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*
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* The spec doesn't say how a canonical JSON generator should
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* handle float values, but given that it is highly unlikely
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* that we will ever be using float values, it shouldn't be
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* an issue if we just skip keys that have float values
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* altogether.
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*/
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continue;
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}
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JsonEncodeString(key, out);
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fputc(':', out);
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CanonicalJsonEncodeValue(value, out);
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if (i < keyCount - 1)
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{
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fputc(',', out);
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}
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}
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fputc('}', out);
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ArrayFree(keys);
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return 1;
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}
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11
src/include/CanonicalJson.h
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11
src/include/CanonicalJson.h
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#ifndef TELODENDRIA_CANONICALJSON_H
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#define TELODENDRIA_CANONICALJSON_H
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#include <stdio.h>
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#include <HashMap.h>
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extern int
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CanonicalJsonEncode(HashMap * object, FILE * out);
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#endif
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