Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/winpr/libwinpr/utils/json/json.c

@@ -0,0 +1,63 @@
+/**
+ * FreeRDP: A Remote Desktop Protocol Implementation
+ * JSON parser wrapper
+ *
+ * Copyright 2024 Armin Novak <anovak@thincast.com>
+ * Copyright 2024 Thincast Technologies GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License 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.
+ */
+#include <math.h>
+#include <errno.h>
+
+#include <winpr/file.h>
+#include <winpr/json.h>
+#include <winpr/assert.h>
+
+WINPR_JSON* WINPR_JSON_ParseFromFile(const char* filename)
+{
+	FILE* fp = winpr_fopen(filename, "r");
+	if (!fp)
+		return nullptr;
+	WINPR_JSON* json = WINPR_JSON_ParseFromFileFP(fp);
+	(void)fclose(fp);
+	return json;
+}
+
+WINPR_JSON* WINPR_JSON_ParseFromFileFP(FILE* fp)
+{
+	if (!fp)
+		return nullptr;
+
+	if (fseek(fp, 0, SEEK_END) != 0)
+		return nullptr;
+
+	const INT64 size = _ftelli64(fp);
+	if (size < 0)
+		return nullptr;
+
+	if (fseek(fp, 0, SEEK_SET) != 0)
+		return nullptr;
+
+	const size_t usize = WINPR_ASSERTING_INT_CAST(size_t, size);
+	char* str = calloc(usize + 1, sizeof(char));
+	if (!str)
+		return nullptr;
+
+	WINPR_JSON* json = nullptr;
+	const size_t s = fread(str, sizeof(char), usize, fp);
+	if (s == usize)
+		json = WINPR_JSON_ParseWithLength(str, usize);
+	free(str);
+	return json;
+}