Diff: src/aws_iot_json_utils.c

Revision:

0:082731ede69f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/aws_iot_json_utils.c	Wed May 30 20:59:51 2018 +0000
@@ -0,0 +1,227 @@
+/*
+ * Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+/**
+ * @file aws_json_utils.c
+ * @brief Utilities for manipulating JSON
+ *
+ * json_utils provides JSON parsing utilities for use with the IoT SDK.
+ * Underlying JSON parsing relies on the Jasmine JSON parser.
+ *
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "aws_iot_json_utils.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "aws_iot_log.h"
+
+int8_t jsoneq(const char *json, jsmntok_t *tok, const char *s) {
+	if(tok->type == JSMN_STRING) {
+		if((int) strlen(s) == tok->end - tok->start) {
+			if(strncmp(json + tok->start, s, (size_t) (tok->end - tok->start)) == 0) {
+				return 0;
+			}
+		}
+	}
+	return -1;
+}
+
+IoT_Error_t parseUnsignedInteger32Value(uint32_t *i, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not an integer");
+		return JSON_PARSE_ERROR;
+	}
+
+	if(('-' == (char) (jsonString[token->start])) || (1 != sscanf(jsonString + token->start, "%lu", i))) {
+		IOT_WARN("Token was not an unsigned integer.");
+		return JSON_PARSE_ERROR;
+	}
+
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseUnsignedInteger16Value(uint16_t *i, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not an integer");
+		return JSON_PARSE_ERROR;
+	}
+
+	if(('-' == (char) (jsonString[token->start])) || (1 != sscanf(jsonString + token->start, "%hu", i))) {
+		IOT_WARN("Token was not an unsigned integer.");
+		return JSON_PARSE_ERROR;
+	}
+
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseUnsignedInteger8Value(uint8_t *i, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not an integer");
+		return JSON_PARSE_ERROR;
+	}
+
+	if(('-' == (char) (jsonString[token->start])) || (1 != sscanf(jsonString + token->start, "%hhu", i))) {
+		IOT_WARN("Token was not an unsigned integer.");
+		return JSON_PARSE_ERROR;
+	}
+
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseInteger32Value(int32_t *i, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not an integer");
+		return JSON_PARSE_ERROR;
+	}
+
+	if(1 != sscanf(jsonString + token->start, "%li", i)) {
+		IOT_WARN("Token was not an integer.");
+		return JSON_PARSE_ERROR;
+	}
+
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseInteger16Value(int16_t *i, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not an integer");
+		return JSON_PARSE_ERROR;
+	}
+
+	if(1 != sscanf(jsonString + token->start, "%hi", i)) {
+		IOT_WARN("Token was not an integer.");
+		return JSON_PARSE_ERROR;
+	}
+
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseInteger8Value(int8_t *i, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not an integer");
+		return JSON_PARSE_ERROR;
+	}
+
+	if(1 != sscanf(jsonString + token->start, "%hhi", i)) {
+		IOT_WARN("Token was not an integer.");
+		return JSON_PARSE_ERROR;
+	}
+
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseFloatValue(float *f, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not a float.");
+		return JSON_PARSE_ERROR;
+	}
+
+	if(1 != sscanf(jsonString + token->start, "%f", f)) {
+		IOT_WARN("Token was not a float.");
+		return JSON_PARSE_ERROR;
+	}
+
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseDoubleValue(double *d, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not a double.");
+		return JSON_PARSE_ERROR;
+	}
+
+	if(1 != sscanf(jsonString + token->start, "%lf", d)) {
+		IOT_WARN("Token was not a double.");
+		return JSON_PARSE_ERROR;
+	}
+
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseBooleanValue(bool *b, const char *jsonString, jsmntok_t *token) {
+	if(token->type != JSMN_PRIMITIVE) {
+		IOT_WARN("Token was not a primitive.");
+		return JSON_PARSE_ERROR;
+	}
+	if(strncmp(jsonString + token->start, "true", 4) == 0) {
+		*b = true;
+	} else if(strncmp(jsonString + token->start, "false", 5) == 0) {
+		*b = false;
+	} else {
+		IOT_WARN("Token was not a bool.");
+		return JSON_PARSE_ERROR;
+	}
+	return AWS_SUCCESS;
+}
+
+IoT_Error_t parseStringValue(char *buf, size_t bufLen, const char *jsonString, jsmntok_t *token) {
+	/* This length does not include a null-terminator. */
+	size_t stringLength = (size_t)(token->end - token->start);
+
+	if(token->type != JSMN_STRING) {
+		IOT_WARN("Token was not a string.");
+		return JSON_PARSE_ERROR;
+	}
+
+	if (stringLength+1 > bufLen) {
+		IOT_WARN("Buffer too small to hold string value.");
+		return SHADOW_JSON_ERROR;
+	}
+
+	strncpy(buf, jsonString + token->start, stringLength);
+	buf[stringLength] = '\0';
+
+	return AWS_SUCCESS;
+}
+
+jsmntok_t *findToken(const char *key, const char *jsonString, jsmntok_t *token) {
+	jsmntok_t *result = token;
+	int i;
+
+	if(token->type != JSMN_OBJECT) {
+		IOT_WARN("Token was not an object.");
+		return NULL;
+	}
+
+	if(token->size == 0) {
+		return NULL;
+	}
+
+	result = token + 1;
+
+	for (i = 0; i < token->size; i++) {
+		if (0 == jsoneq(jsonString, result, key)) {
+			return result + 1;
+		}
+
+		int propertyEnd = (result + 1)->end;
+		result += 2;
+		while (result->start < propertyEnd)
+			result++;
+	}
+
+	return NULL;
+}
+
+#ifdef __cplusplus
+}
+#endif