initial commit

sgutil/sgu_mode_make_diff.h

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+#pragma once
+
+/**
+ * Creates a binary diff patch file between two input files using the BSDIFF43 format and bzip2 compression.
+ *
+ * @param inputFilename1  The path to the original (old) input file.
+ * @param inputFilename2  The path to the new input file to compare against.
+ * @param outputFilename  The path to the output file where the diff patch will be written.
+ * @return true if the diff file is created successfully; false otherwise.
+ *
+ * The function performs the following steps:
+ * 1. Validates input and output file names.
+ * 2. Reads both input files into memory buffers.
+ * 3. Opens the output file for writing and writes the BSDIFF43 header and the new file size.
+ * 4. Initializes bzip2 compression for the output file.
+ * 5. Uses the bsdiff algorithm to generate the binary diff between the two buffers, writing the result through a bzip2 stream.
+ * 6. Finalizes the bzip2 stream and closes all files and buffers.
+ * 7. Returns true on success, or false if any error occurs during processing.
+ */
+bool createDiff(const char* inputFilename, const char* inputFilename2, const char* outputFilename);