feat: Implement brute-forcing the raw size

Oodle must know the size of the uncompressed data when decompressing
data. If you don't know that size, the only option is to guess.
And since it needs to be the exact number, you simply have to try
every number.

oodle-cli.cpp

@@ -22,39 +22,125 @@ const LPCWSTR LIB_NAME = L"oo2core_8_win64";
 // It's not like this is going to change often.
 const char* LIB_FILE = "oo2core_8_win64.dll";
 
+typedef decltype(OodleLZ_Decompress)* decompress_func;
+typedef decltype(OodleCore_Plugins_SetPrintf)* setprintf_func;
+
+#define OK 0
+#define GENERIC_ERROR -1
+#define DECOMPRESS_ERROR -2
+
 void usage() {
     std::cerr <<
-        "Usage: oodle-cli <in_file> <out_file> <uncompressed_size>\n"
+        "Usage: oodle-cli [OPTIONS] [--] <in_file> <out_file> <uncompressed_size>\n"
         "Decompress a <in_file> to <out_file> using the Oodle algorithm.\n"
-        "The size of the uncompressed data must be known.\n"
+        "The size of the uncompressed data must be known. If 0 is given, the tool will\n"
+        "attempt to brute-force the correct number by incrementing from the compressed size.\n"
+        "\n"
+        "Options:\n"
+        "  -v  Increase Oodle's verbosity. May be specified up to three times.\n"
+        "  -c  Only check if the library can be found and used.\n"
+        "  --guess <number> When guessing the uncompressed size, a maximum number as multiple of the compressed size prevents an infinite loop. This changes the factor. Defaults to 10."
         "\n"
         "The following environmental variables are recognized:\n"
-        "  VERBOSITY: An integer between 0 and 3, with 0 being no logging and 3 being maximum logging.\n"
         "  DLL_SEARCH_PATH: A color (':') separated list of directories to search for the Oodle library. May be relative to the current working directory.\n";
 }
 
+void printf_callback(int verboseLevel, const char* file, int line, const char* fmt, ...) {
+    std::cout << "[OODLE] ";
+
+    // For some reason, this doesn't actually map to the config value.
+    switch (verboseLevel) {
+    case 0:
+        std::cout << "EXTRAORDINARILY IMPORTANT: ";
+        break;
+    case 1:
+        std::cout << "EXTERMELY IMPORTANT: ";
+        break;
+    case 2:
+        std::cout << "VERY IMPORTANT: ";
+        break;
+    }
+
+    va_list args;
+    va_start(args, fmt);
+    vfprintf(stdout, fmt, args);
+}
+
+int do_decompress(decompress_func decompress, std::vector<char> compressed_buffer, std::string out_name, size_t raw_buffer_size, OodleLZ_Verbosity verbosity) {
+    std::vector<char> raw_buffer(raw_buffer_size);
+
+    intptr_t res = decompress(
+        compressed_buffer.data(),
+        compressed_buffer.size(),
+        raw_buffer.data(),
+        raw_buffer_size,
+        OodleLZ_FuzzSafe_Yes,
+        OodleLZ_CheckCRC_No,
+        verbosity,
+        nullptr,
+        0,
+        nullptr,
+        nullptr,
+        nullptr,
+        0,
+        OodleLZ_Decode_Unthreaded
+    );
+
+    if (res != raw_buffer_size) {
+        return DECOMPRESS_ERROR;
+    }
+
+    std::ofstream out_file(out_name, std::ios::binary);
+    if (!out_file) {
+        std::cerr << "ERROR: Failed to open output file!\n";
+        return GENERIC_ERROR;
+    }
+
+    out_file.write(raw_buffer.data(), res);
+
+    if (out_file.fail()) {
+        std::cerr << "ERROR: Failed to write output file!\n";
+        return GENERIC_ERROR;
+    }
+
+    return OK;
+}
+
 int main(int argc, char* argv[])
 {
-    if (argc < 4) {
+    int verbosity = 0;
-        std::cerr << "Arguments missing!\n\n";
+    bool check_lib = FALSE;
+    int guess_factor = 10;
+    int i = 1;
+
+    for (; i < argc; i++) {
+        char* arg = argv[i];
+
+        if (strcmp(arg, "--") == 0 || arg[0] != '-') {
+            break;
+        }
+
+        if (strcmp(arg, "--help") == 0) {
             usage();
-        return 1;
+            return 0;
+        }
+        else if (strcmp(arg, "-c") == 0) {
+            check_lib = TRUE;
+        }
+        else if (strcmp(arg, "-v") == 0) {
+            verbosity++;
+        }
+        else if (strcmp(arg, "--guess") == 0) {
+            i++;
+            guess_factor = std::stoi(argv[i]);
+        }
+        else {
+            std::cerr << "WARN: Unknown option '" << arg << "'!\n\n";
+        }
     }
 
     char* var;
     size_t len;
-    int verbosity = 0;
-    if (_dupenv_s(&var, &len, "VERBOSITY") == 0) {
-        if (var) {
-            verbosity = std::stoi(std::string(var, len));
-            std::cout << "Setting Oodle verbosity to " << verbosity << ".\n";
-            free(var);
-        }
-    }
-    else {
-        std::cerr << "Failed to read environment variable 'VERBOSITY'. Falling back to default.\n";
-    }
-
     DWORD load_flags = 0;
     if (_dupenv_s(&var, &len, "DLL_SEARCH_PATH") == 0) {
         if (var) {
@@ -69,10 +155,10 @@ int main(int argc, char* argv[])
                 }
 
                 if (!path.is_absolute() || !AddDllDirectory(path.c_str())) {
-                    std::cerr << "Failed to add DLL search path: '" << token << "'!\n";
+                    std::cerr << "WARN: Failed to add DLL search path: '" << token << "'!\n";
                 }
                 else {
-                    std::cout << "Added DLL search path: '" << path << "'.\n";
+                    std::cout << "INFO: Added DLL search path: '" << path << "'.\n";
                 }
             }
 
@@ -81,7 +167,7 @@ int main(int argc, char* argv[])
         }
     }
     else {
-        std::cerr << "Failed to read environment variable 'DLL_SEARCH_PATH'. Skipping.\n";
+        std::cerr << "ERROR: Failed to read environment variable 'DLL_SEARCH_PATH'. Skipping.\n";
     }
 
     HINSTANCE hDLL = LoadLibraryEx(LIB_NAME, NULL, load_flags);
@@ -90,27 +176,41 @@ int main(int argc, char* argv[])
         return 1;
     }
 
-    auto decompress = (decltype(OodleLZ_Decompress)*)GetProcAddress((HMODULE)hDLL, "OodleLZ_Decompress");
+    auto decompress = reinterpret_cast<decompress_func>(GetProcAddress((HMODULE)hDLL, "OodleLZ_Decompress"));
     if (decompress == NULL) {
         std::cerr << "ERROR: The library is incompatible!\n";
         return 1;
     }
 
-    std::string in_name = argv[1];
+    if (check_lib) {
-    std::string out_name = argv[2];
+        std::cout << "INFO: '" << LIB_FILE << "' found and loaded.\n";
-    size_t raw_buffer_size = std::stoi(argv[3]);
+        return 0;
+    }
 
-    std::cout << "Attempting to decompress from '" << in_name << "' to '" << out_name << "' (" << raw_buffer_size << " bytes).\n";
+    if (argc - i < 3) {
-
+        std::cerr << "ERROR: Arguments missing!\n\n";
-    std::ifstream in_file(in_name, std::ios::binary | std::ios::ate);
+        usage();
-    if (!in_file) {
-        std::cerr << "Failed to open compressed file!\n";
         return 1;
     }
 
-    std::ofstream out_file(out_name, std::ios::binary);
+    std::string in_name = argv[i];
-    if (!out_file) {
+    std::string out_name = argv[i + 1];
-        std::cerr << "Failed to open output file!\n";
+    size_t raw_buffer_size = std::stoi(argv[i + 2]);
+
+    std::cout << "INFO: Attempting to decompress from '" << in_name << "' to '" << out_name << "' (" << raw_buffer_size << " bytes).\n";
+
+    if (verbosity > 0) {
+        auto fn = reinterpret_cast<setprintf_func>(GetProcAddress((HMODULE)hDLL, "OodleCore_Plugins_SetPrintf"));
+        if (fn == NULL) {
+            std::cerr << "ERROR: The library is incompatible!\n";
+            return 1;
+        }
+        reinterpret_cast<void*>(fn(printf_callback));
+    }
+
+    std::ifstream in_file(in_name, std::ios::binary | std::ios::ate);
+    if (!in_file) {
+        std::cerr << "ERROR: Failed to open compressed file!\n";
         return 1;
     }
 
@@ -121,40 +221,45 @@ int main(int argc, char* argv[])
     in_file.read(compressed_buffer.data(), compressed_buffer_size);
 
     if (in_file.fail()) {
-        std::cerr << "Failed to read compressed file!\n";
+        std::cerr << "ERROR: Failed to read compressed file!\n";
         return 1;
     }
 
-    std::vector<char> raw_buffer(raw_buffer_size);
+    if (raw_buffer_size > 0) {
+        int res = do_decompress(decompress, compressed_buffer, out_name, raw_buffer_size, (OodleLZ_Verbosity)verbosity);
 
-    int res = decompress(
+        if (res == DECOMPRESS_ERROR) {
-        compressed_buffer.data(),
+            std::cerr << "ERROR: Failed to decompress!\n";
-        compressed_buffer_size,
-        raw_buffer.data(),
-        raw_buffer_size,
-        OodleLZ_FuzzSafe_Yes,
-        OodleLZ_CheckCRC_No,
-        (OodleLZ_Verbosity)verbosity,
-        nullptr,
-        0,
-        nullptr,
-        nullptr,
-        nullptr,
-        0,
-        OodleLZ_Decode_Unthreaded
-    );
-
-    out_file.write(raw_buffer.data(), res);
-
-    if (out_file.fail()) {
-        std::cerr << "Failed to write output file!\n";
             return 1;
         }
-
+        else if (res == GENERIC_ERROR) {
-    if (res != raw_buffer_size) {
-        std::cerr << "Failed to decompress. Expected " << raw_buffer_size << " bytes, got " << res << "!\n";
             return 1;
         }
+    }
+    else {
+        size_t guessed_size = compressed_buffer.size();
+        // I need some maximum value to avoid infinite loops. The factor is configurable.
+        size_t max = guessed_size * guess_factor;
 
-    std::cout << "Done!\n";
+        while (true) {
+            int res = do_decompress(decompress, compressed_buffer, out_name, guessed_size, (OodleLZ_Verbosity)verbosity);
+            
+            if (res == GENERIC_ERROR) {
+                return 1;
+            }
+            else if (res == OK) {
+                std::cout << "INFO: Found decompressed size as " << guessed_size << "\n";
+                break;
+            }
+
+            guessed_size++;
+
+            if (guessed_size > max) {
+                std::cerr << "ERROR: Exceeded maximum value for guessing uncompressed size!\n";
+                return 1;
+            }
+        }
+    }
+
+    std::cout << "INFO: Done!\n";
 }

oodle2.h

@@ -11,8 +11,6 @@
 #define OODLE2_VERSION_MINOR 14
 
 // OodleVersion string is 1 . MAJOR . MINOR
-//  don't make it from macros cuz the doc tool has to parse the string literal
-
 #define OodleVersion "2.8.14"
 
 
@@ -49,7 +47,6 @@ typedef enum OodleLZ_Compressor {
 } OodleLZ_Compressor;
 
 
-
 typedef enum OodleLZ_CheckCRC {
     OodleLZ_CheckCRC_No = 0,
     OodleLZ_CheckCRC_Yes = 1,
@@ -163,7 +160,7 @@ typedef enum OodleLZ_FuzzSafe {
     seek chunk boundaries are relative to _dictionaryBase_, not to _rawBuf_.
 
 */
-int OodleLZ_Compress(
+extern "C" intptr_t __stdcall OodleLZ_Compress(
     OodleLZ_Compressor       compressor,
     const void*              raw_buffer,
     size_t                   raw_len,
@@ -250,7 +247,7 @@ int OodleLZ_Compress(
     Use of OodleLZ_FuzzSafe_No is deprecated.
 
 */
-int OodleLZ_Decompress(
+extern "C" intptr_t __stdcall OodleLZ_Decompress(
     const void* compressed_buffer,
     size_t                      compressed_length,
     void*                       raw_buffer,
@@ -266,3 +263,25 @@ int OodleLZ_Decompress(
     size_t                      decoder_memory_size, // Default: 0
     OodleLZ_Decode_ThreadPhase  thread_phase         // Default: OodleLZ_Decode_Unthreaded
 );
+
+/* Function pointer to Oodle Core printf
+    $:verboseLevel  verbosity of the message; 0-2 ; lower = more important
+    $:file          C file that sent the message
+    $:line          C line that sent the message
+    $:fmt           vararg printf format string
+    The logging function installed here must parse varargs like printf.
+    _verboseLevel_ may be used to omit verbose messages.
+*/
+extern "C" typedef void(__stdcall t_fp_OodleCore_Plugin_Printf)(int verboseLevel, const char* file, int line, const char* fmt, ...);
+
+/* Install the callback used by Oodle Core for logging
+    $:fp_rrRawPrintf    function pointer to your log function; may be NULL to disable all logging
+    $:return            returns the previous function pointer
+    Use this function to install your own printf for Oodle Core.
+    The default implementation in debug builds, if you install nothing, uses the C stdio printf for logging.
+    On Microsoft platforms, it uses OutputDebugString and not stdio.
+    To disable all logging, call OodleCore_Plugins_SetPrintf(NULL)
+    WARNING : this function is NOT thread safe!  It should be done only once and done in a place where the caller can guarantee thread safety.
+    In the debug build of Oodle, you can install OodleCore_Plugin_Printf_Verbose to get more verbose logging
+*/
+t_fp_OodleCore_Plugin_Printf* __stdcall OodleCore_Plugins_SetPrintf(t_fp_OodleCore_Plugin_Printf* fp_rrRawPrintf);