tools/zlibutil: Change CLI to act more like other compression utilities

Compression is now the implied default action, decompress with the -d flag.

src/tools/zlibutil.cpp

@@ -36,7 +36,7 @@
 #define CHUNK_SIZE 16384 // Chunk size
 
 /*
-Finnaly, the main file
+Finally, the main file
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@@ -66,7 +66,6 @@ Finnaly, the main file
 
 int main(int argc, char* argv[]) {
     std::vector<CLI::Flag> flags;
-    flags.push_back(CLI::Flag('c', "compress",        "compress a file"));
     flags.push_back(CLI::Flag('d', "decompress", "descompress a file"));
     std::vector<CLI::Option> options;
     std::vector<CLI::Argument> arguments;
@@ -105,32 +104,39 @@ int main(int argc, char* argv[]) {
         return EXIT_USAGE;
     }
 
+    std::string filename = cliParser.getArgument(0).value;
 
-    ErrorOr<File*> filePointer = File::open(cliParser.getArgument(0).value, 'r');
+    ErrorOr<File*> filePointer = File::open(filename, 'r');
     if (filePointer.isError) {
-        std::cout << "Failed to open file: " << cliParser.getArgument(0).value << std::endl;
+        std::cout << "Failed to open file: " << filename << std::endl;
         return EXIT_RUNTIME;
     }
     File* file = filePointer.value;
     File *writeFile;
 
-    if (cliParser.getFlag("compress").value) {
+    if (cliParser.getFlag("decompress").value) {
-        std::vector<uint8_t> bytes = file->read(file->size.value).value; // this is what you get from lib/file IIRC
-        std::vector<char> differentBytes = std::vector<char>(bytes.begin(), bytes.end());
-
-        std::vector<char> compressed = compressData(differentBytes.data(), file->size.value);
-        std::vector<unsigned char> unsigneddata = std::vector<unsigned char>(compressed.begin(), compressed.end());
-        writeFile = File::open(cliParser.getArgument(0).value + ".compressed", 'w').value;
-        writeFile->write(unsigneddata);
-        writeFile->close();
-   	} else if (cliParser.getFlag("decompress").value) {
         std::vector<uint8_t> bytes = file->read(file->size.value).value; // this is what you get from lib/file IIRC
         std::vector<char> differentBytes = std::vector<char>(bytes.begin(), bytes.end());
 
         std::vector<char> compressed = decompressData(differentBytes.data(), file->size.value);
         std::vector<unsigned char> unsigneddata = std::vector<unsigned char>(compressed.begin(), compressed.end());
 
-        writeFile = File::open(cliParser.getArgument(0).value + ".uncompressed", 'w').value;
+        std::string outFilename;
+        if (filename.length() > 3 && filename.rfind(".zz") == filename.length()-3) {
+            outFilename = filename.substr(0, filename.length()-3);
+        } else {
+            outFilename = filename + ".uncompressed";
+        }
+        writeFile = File::open(outFilename, 'w').value;
+        writeFile->write(unsigneddata);
+        writeFile->close();
+    } else {
+        std::vector<uint8_t> bytes = file->read(file->size.value).value; // this is what you get from lib/file IIRC
+        std::vector<char> differentBytes = std::vector<char>(bytes.begin(), bytes.end());
+
+        std::vector<char> compressed = compressData(differentBytes.data(), file->size.value);
+        std::vector<unsigned char> unsigneddata = std::vector<unsigned char>(compressed.begin(), compressed.end());
+        writeFile = File::open(filename + ".zz", 'w').value;
         writeFile->write(unsigneddata);
         writeFile->close();
    	}