✨ Enable use of command line options

.vscode/settings.json

@@ -3,7 +3,8 @@
     "filereader.h": "c",
     "decrypt.h": "c",
     "stdint.h": "c",
-    "decryptutilities.h": "c"
+    "decryptutilities.h": "c",
+    "fileutilities.h": "c"
   },
   "cSpell.words": [
     "init",

README.md

@@ -1,5 +1,19 @@
 This tool installs a patch, assuming the patch files are already downloaded, and if not patching from -1, that the previous patch is already installed.
 
+# Usage
+
+To compile:
+
+```
+./build.sh
+```
+
+To use:
+
+```
+./patcher-installer --disk /tmp/patcher/cdn-patch.swtor.com/patch/assets_swtor_main/assets_swtor_main_-1to0/assets_swtor_main_-1to0.z08 --offset 267071107 --size 165738618 --keys 3393608425 2820264972 3930508185 > ../swtor_main_gfx_1.tor
+```
+
 # Dependencies
 
 ## Miniz <[https://github.com/richgel999/miniz](https://github.com/richgel999/miniz)>

src/fileReader.c

@@ -31,7 +31,7 @@ void initFileReader(char path[], unsigned long offset) {
 }
 
 
-//Reads the given amount of bytes from the file and returns them. Automatically opens next file if EOF is reached.
+//Reads the given amount of bytes from the file and writes them into the given buffer. Automatically opens next file if EOF is reached.
 void getBytes(uint8_t* buffer, unsigned long numBytes) {
   char* bufferPosition = buffer;
   unsigned long remainingBytes = numBytes;
@@ -40,8 +40,14 @@ void getBytes(uint8_t* buffer, unsigned long numBytes) {
   while (remainingBytes > 0) {
     //Read as many bytes as we can from the current file
     const unsigned long availableBytes = min(remainingBytes, file.size - file.offset);
+
+    //Read bytes into buffer if we have a valid buffer, otherwise skip bytes
+    if (buffer) {
       readBytesIntoBuffer(bufferPosition, availableBytes);
       bufferPosition += availableBytes;
+    } else {
+      skipBytes(availableBytes);
+    }
     remainingBytes -= availableBytes;
 
     //If we've reached end of file, close file and open next file

src/main.c

@@ -1,4 +1,5 @@
 #include <errno.h>
+#include <getopt.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -26,24 +27,98 @@ uint32_t getUint32(uint8_t* buffer) {
     (uint32_t)buffer[3] << 24;
 }
 
-int main(int argc, unsigned char *argv[]) {
-  if (argc != 4 && argc != 7) {
-    fprintf(stderr, "Wrong number of arguments. Usage: patcher-installer <disk_name> <disk_offset> <file_size> [<key0> <key1> <key2>]");
+struct arguments {
+  /** Path to the disk file that contains the start of the file we want to extract.
+   * The file may stretch across multiple disks though.
+   */
+  char* diskName;
+  /** Offset into the disk where the file starts. */
+  unsigned long diskOffset;
+  /** Size of the file stored in the disk. */
+  unsigned long fileSize;
+  //Decryption keys
+  bool isEncrypted;
+  uint32_t key0;
+  uint32_t key1;
+  uint32_t key2;
+  //TODO: For xdelta3, the location of the old file
+  char* prevFile;
+};
+
+static struct option long_options[] = {
+  {"disk", required_argument, 0, 'd'},
+  {"offset", required_argument, 0, 'o'},
+  {"size", required_argument, 0, 's'},
+  {"keys", required_argument, 0, 'k'},
+  {"prev", required_argument, 0, 'p'},
+};
+
+//Stores current state from command line arguments, initialized to zero
+struct arguments state = {};
+
+int main(int argc, char *argv[]) {
+  //Parse command line arguments
+
+  int requiredOptions = 0;
+
+  while (1) {
+    //in this variable, getopt_long stores the current position in the command line args array
+    int option_index = 0;
+
+    int curOption = getopt_long(argc, argv, "d:o:s:k:", long_options, &option_index);
+
+    //end of command line arguments reached
+    if (curOption == -1) {
+      break;
+    }
+
+    switch (curOption) {
+      case 'd': //disk name
+        state.diskName = optarg;
+        requiredOptions |= 1;
+        break;
+      case 'o': //offset
+        state.diskOffset = atol(optarg);
+        requiredOptions |= 2;
+        break;
+      case 's': //size
+        state.fileSize = atol(optarg);
+        requiredOptions |= 4;
+        break;
+      case 'k': { //decryption keys
+        //TODO: parse from optarg
+        uint32_t key0 = atoi(argv[8]);
+        uint32_t key1 = atoi(argv[9]);
+        uint32_t key2 = atoi(argv[10]);
+        //Initialize decryption (pass decryption keys)
+        initDecryptor(key0, key1, key2);
+        state.isEncrypted = true;
+        break;
+      }
+      default:
+        fprintf(stderr, "Unknown option '%c'.", (char)curOption);
         exit(1);
     }
-  //TODO: verify argv and assign it to variables
-  char* archiveName = argv[1];
-  const unsigned long archiveOffset = atol(argv[2]);
-  const unsigned long fileLength = atol(argv[3]);
+  }
 
-  const bool isEncrypted = argc == 7;
-  if (isEncrypted) {
+  if (requiredOptions != 7) {
+    fprintf(stderr, "Missing arguments, received %i.", requiredOptions);
+    exit(1);
+  }
+
+  //TODO: verify argv and assign it to variables
+  //char* archiveName = argv[1];
+  //const unsigned long archiveOffset = atol(argv[2]);
+  //const unsigned long fileLength = atol(argv[3]);
+
+  //const bool isEncrypted = argc == 7;
+  /*if (isEncrypted) {
     uint32_t key0 = atoi(argv[4]);
     uint32_t key1 = atoi(argv[5]);
     uint32_t key2 = atoi(argv[6]);
     //Initialize decryption (pass decryption keys)
     initDecryptor(key0, key1, key2);
-  }
+  }*/
 
   //-------------------------------------------------
 
@@ -63,7 +138,7 @@ int main(int argc, unsigned char *argv[]) {
   //-------------------------------------------------
 
   //Initialize file reader
-  initFileReader(archiveName, archiveOffset);
+  initFileReader(state.diskName, state.diskOffset);
 
   //Skip local file header (30 bytes + additional length)
   getBytes(compressedChunk, 30UL);
@@ -75,10 +150,12 @@ int main(int argc, unsigned char *argv[]) {
   }
   //Read additional length
   const unsigned long additionalLength = getUint16(compressedChunk + 26) + getUint16(compressedChunk + 28);
-  getBytes(compressedChunk, additionalLength);
+  if (additionalLength > 0UL) {
+    getBytes(NULL, additionalLength);
+  }
 
   //If file is encrypted, skip 12-byte encryption header
-  if (isEncrypted) {
+  if (state.isEncrypted) {
     getBytes(compressedChunk, ENCRYPTION_HEADER_LENGTH);
     decrypt(compressedChunk, ENCRYPTION_HEADER_LENGTH);
   }
@@ -89,7 +166,7 @@ int main(int argc, unsigned char *argv[]) {
   inflateInit(compressedChunk, uncompressedChunk, BUFFER_SIZE);
 
   //Read actual file
-  unsigned long remainingBytes = fileLength;
+  unsigned long remainingBytes = state.fileSize;
   bool needToRead = true;
   bool hasReachedEnd = false;
   unsigned long chunkSize;
@@ -101,7 +178,7 @@ int main(int argc, unsigned char *argv[]) {
       remainingBytes -= chunkSize;
 
       //Decrypt file if it is encrypted
-      if (isEncrypted) {
+      if (state.isEncrypted) {
         //TODO: For highest performance, we need to move if condition outside of while loop
         decrypt(compressedChunk, chunkSize);
       }
@@ -115,6 +192,7 @@ int main(int argc, unsigned char *argv[]) {
 
     //important: we must not modify uncompressedChunk since miniz may use it as dictionary and read from it during the next invocation of inflateInflate()
 
+    //Write to stdout
     write(1, uncompressedChunk + uncompressedPosition, inflateResult.numBytesWrittenToOutput);
     uncompressedPosition += inflateResult.numBytesWrittenToOutput;
     while (uncompressedPosition >= BUFFER_SIZE) {
@@ -122,8 +200,9 @@ int main(int argc, unsigned char *argv[]) {
     }
 
     //Optionally perform xdelta3
+    if (state.prevFile) {
     //TODO
-
+    }
   }
 
   //release memory

src/utils/fileUtilities.c

@@ -19,6 +19,19 @@ void readBytesIntoBuffer(uint8_t* buffer, long numBytes) {
 }
 
 
+//Skips the given amount of bytes in the file
+void skipBytes(long numBytes) {
+  const int result = fseek(file.filePointer, numBytes, SEEK_CUR);
+
+  if (result != 0) {
+    fprintf(stderr, "Could not skip %lu bytes from file: %s\n", numBytes, strerror(errno));
+    exit(1);
+  } else {
+    file.offset += numBytes;
+  }
+}
+
+
 //Closes the currently opened file and opens the next file at its beginning.
 void openNextFile() {
   const int closeResult = fclose(file.filePointer);

src/utils/fileUtilities.h

@@ -17,5 +17,9 @@ struct FILE_INFO file;
 void readBytesIntoBuffer(uint8_t* buffer, long numBytes);
 
 
+//Skips the given amount of bytes in the file
+void skipBytes(long numBytes);
+
+
 //Closes the currently opened file and opens the next file at its beginning.
 void openNextFile();