initial commit

sgutil/sgu_mode_gen_rand_file.cpp

@@ -0,0 +1,59 @@
+#include "sgu_stdafx.h"
+#include "sgu_mode_gen_rand_file.h"
+#include "sgu_utils.h"
+
+bool generateRandomFile(size_t minSize, size_t maxSize, const char* outputFilename)
+{
+	if (!outputFilename || !*outputFilename) {
+		printf("Error: Output filename is not specified.\n");
+		return false;
+	}
+	if (minSize > maxSize) {
+		printf("Error: Min size cannot be greater than max size.\n");
+		return false;
+	}
+	if (maxSize - minSize >= 2ULL * 1024ULL * 1024ULL * 1024ULL) {
+		printf("Error: Size range is too large(>2GB). Please specify a smaller range.\n");
+		return false;
+	}
+
+	size_t fileSize = randomInRange(minSize, maxSize);
+
+	FILE* file = nullptr;
+	fopen_s(&file, outputFilename, "wb");
+	if (!file) {
+		printf("Error: Cannot open output file %s for writing.\n", outputFilename);
+		return false;
+	}
+
+	const size_t kMaxBufSize = 1 * 1024 * 1024; // 1 MB
+	uint8_t* buffer = new uint8_t[kMaxBufSize];
+	if (!buffer) {
+		fclose(file);
+		printf("Error: Memory allocation failed for buffer.\n");
+		return false;
+	}
+
+	size_t remainSize = fileSize;
+
+	while (remainSize > 0)
+	{
+		size_t chunkSize = (remainSize > kMaxBufSize) ? kMaxBufSize : remainSize;
+		// Fill the buffer with random data
+		fillRandomData(buffer, chunkSize);
+
+		// Write the buffer to the file
+		if (fwrite(buffer, 1, chunkSize, file) != chunkSize) 
+		{
+			fclose(file);
+			delete[] buffer;
+			printf("Error: Failed to write to output file %s.\n", outputFilename);
+			return false;
+		}
+		remainSize -= chunkSize;
+	}
+	fclose(file);
+	delete[] buffer;
+	printf("Random file generated successfully: %s (%s)\n", outputFilename, sizeToString(fileSize).c_str());
+	return true;
+}