cpp-common: add `dataFromFile()`

[babeltrace.git] / src / cpp-common / bt2c / file-utils.cpp

diff --git a/src/cpp-common/bt2c/file-utils.cpp b/src/cpp-common/bt2c/file-utils.cpp
new file mode 100644 (file)
index 0000000..9352018
--- /dev/null
+++ b/src/cpp-common/bt2c/file-utils.cpp
@@ -0,0 +1,38 @@
+
+/*
+ * Copyright (c) 2022 Francis Deslauriers <francis.deslauriers@efficios.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+#include <fstream>
+
+#include "exc.hpp"
+#include "file-utils.hpp"
+
+namespace bt2c {
+
+std::vector<std::uint8_t> dataFromFile(const char * const filePath)
+{
+    /*
+     * Open a file stream and seek to the end of the stream to compute the size
+     * of the buffer required.
+    */
+    std::ifstream file {filePath, std::ios::binary | std::ios::ate};
+
+    if (!file) {
+        throw NoSuchFileOrDirectoryError {};
+    }
+
+    const auto size = file.tellg();
+    std::vector<uint8_t> buffer(static_cast<std::size_t>(size));
+
+    /*
+     * Seek the reading head back at the beginning of the stream to actually
+     * read the content.
+     */
+    file.seekg(0, std::ios::beg);
+    file.read(reinterpret_cast<char *>(buffer.data()), size);
+    return buffer;
+}
+
+} /* namespace bt2c */