[Scummvm-cvs-logs] scummvm-tools master -> 9283a98f532122df230ac0f6c8dbe0d0eaa5614d

Strangerke Strangerke at scummvm.org
Sat Sep 3 23:42:08 CEST 2011


This automated email contains information about 1 new commit which have been
pushed to the 'scummvm-tools' repo located at https://github.com/scummvm/scummvm-tools .

Summary:
9283a98f53 TOOLS: Add CGE (un)packer


Commit: 9283a98f532122df230ac0f6c8dbe0d0eaa5614d
    https://github.com/scummvm/scummvm-tools/commit/9283a98f532122df230ac0f6c8dbe0d0eaa5614d
Author: Strangerke (strangerke at scummvm.org)
Date: 2011-09-03T14:40:21-07:00

Commit Message:
TOOLS: Add CGE (un)packer

Changed paths:
  A engines/cge/compress_cge.cpp
  A engines/cge/compress_cge.h



diff --git a/engines/cge/compress_cge.cpp b/engines/cge/compress_cge.cpp
new file mode 100644
index 0000000..11938dc
--- /dev/null
+++ b/engines/cge/compress_cge.cpp
@@ -0,0 +1,233 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "compress_cge.h"
+
+#define BUFFER_SIZE 8192
+#define SEED        0xA5
+#define MAX_FILES   5000
+
+static void readData(FILE *f, byte *buff, int size) {
+	int bytesRead = fread(buff, 1, size, f);
+	for (int i = 0; i < bytesRead; ++i)
+		buff[i] ^= SEED;
+}
+
+static void writeData(FILE *f, byte *buff, int size) {
+	for (int i = 0; i < size; ++i)
+		buff[i] ^= SEED;
+	fwrite(buff, 1, size, f);
+}
+
+static void unpack() {
+	printf("Unpacking...\n");
+
+	FILE *volCat, *volDat, *fOut, *fFiles;
+	BtPage btPage;
+
+	if ((volCat = fopen("vol.cat", "rb")) == NULL) {
+		printf("FATAL: Unable to open vol.cat\n");
+		exit(0);
+	}
+
+	if ((volDat = fopen("vol.dat", "rb")) == NULL) {
+		printf("FATAL: Unable to open vol.dat\n");
+		exit(0);
+	}
+
+	if ((fFiles = fopen("files.txt", "w")) == NULL) {
+		printf("FATAL: Unable to create files.txt\n");
+		exit(0);
+	}
+
+	// Get in a list of pages individual files will be on
+	readData(volCat, (byte *)&btPage, sizeof(BtPage));
+
+	int pageList[1000];
+	int pageCount = btPage._hea._count;
+	pageList[0] = btPage._hea._down;
+	for (int i = 0; i < pageCount; ++i)
+		pageList[i + 1] = btPage._inn[i]._down;
+	
+	bool first = true;
+	// Loop through the pages of individual files
+	for (int i = 0; i <= pageCount; ++i) {
+		// Move to correct page and read it
+		fseek(volCat, pageList[i] * sizeof(BtPage), SEEK_SET);
+		readData(volCat, (byte *)&btPage, sizeof(BtPage));
+		
+		// Process the files
+		for (unsigned int fileNum = 0; fileNum < btPage._hea._count; ++fileNum) {
+			char fname[256];
+			strcpy(fname, btPage._lea[fileNum]._key);
+			
+			// Add filename to files list
+			if (!first)
+				fprintf(fFiles, "\n%s", btPage._lea[fileNum]._key);
+			else {
+				fprintf(fFiles, "%s", btPage._lea[fileNum]._key);
+				first = false;
+			}
+
+			fOut = fopen(fname, "wb");
+			byte *buffer = (byte *)malloc(btPage._lea[fileNum]._size);
+
+			fseek(volDat, btPage._lea[fileNum]._mark, SEEK_SET);
+			readData(volDat, buffer, btPage._lea[fileNum]._size);
+			fwrite(buffer, 1, btPage._lea[fileNum]._size, fOut);
+
+			fclose(fOut);
+			free(buffer);
+		}
+	}
+
+	fclose(volCat);
+	fclose(volDat);
+	fclose(fFiles);
+}
+
+static void pack() {
+	FILE *volCat, *volDat, *fIn;
+	BtPage btPage;
+	printf("Packing...\n");
+
+	// Load in the list of files to recompress
+	char files[MAX_FILES][kBtKeySize];
+	int fileCount = 0;
+	if ((fIn = fopen("files.txt", "r")) == NULL) {
+		printf("FATAL: Unable to open files.txt\n");
+		exit(0);
+	}
+
+	while (!feof(fIn)) {
+		fscanf(fIn, "%s", &files[fileCount++][0]);
+		if (fileCount == MAX_FILES) {
+			printf("FATAL: Max files reached\n");
+			exit(0);
+		}
+	}
+	fclose(fIn);
+
+	// Open vol cat and dat files for writing
+	if ((volCat = fopen("vol.cat", "wb")) == NULL) {
+		printf("FATAL: Unable to create vol.cat");
+		exit(0);
+	}
+	if ((volDat = fopen("vol.dat", "wb")) == NULL) {
+		printf("FATAL: Unable to create vol.dat");
+		exit(0);
+	}
+
+	/* Build the index page */
+	// Header
+	memset(&btPage, 0, sizeof(BtPage));
+	int pageCount = fileCount / LEA_SIZE;
+	btPage._hea._count = pageCount;
+	btPage._hea._down = 1;
+
+	// Innert file list - lists the first file of the next page
+	for (int pageNum = 0; pageNum < pageCount; ++pageNum) {
+		int nextFile = (pageNum + 1) * LEA_SIZE;
+
+		btPage._inn[pageNum]._down = pageNum + 2;
+		strcpy((char *)&btPage._inn[pageNum]._key[0], files[nextFile]);
+	}
+
+	// Write out the index page
+	writeData(volCat, (byte *)&btPage, sizeof(BtPage));
+
+	// Loop through processing each page and the dat file
+	pageCount = (fileCount + LEA_SIZE - 1) / LEA_SIZE;
+	int fileIndex = 0;
+	for (int pageNum = 0; pageNum < pageCount; ++pageNum) {
+		int startFile = pageNum * LEA_SIZE;
+		int lastFile = (pageNum + 1) * LEA_SIZE - 1;
+		if (lastFile >= fileCount)
+			lastFile = fileCount - 1;
+
+		// Header
+		memset(&btPage, 0, sizeof(BtPage));
+		btPage._hea._count = lastFile - startFile + 1;
+		btPage._hea._down = 0xffff;
+
+		for (int fileNum = 0; fileNum < btPage._hea._count; ++fileNum, ++fileIndex) {
+			// Set filename and offset in dat file
+			strcpy(btPage._lea[fileNum]._key, &files[fileIndex][0]);
+			btPage._lea[fileNum]._mark = ftell(volDat);
+
+			// Load the given file and write it into the dat file
+			char fname[32];
+			strcpy(fname, files[fileIndex]);
+
+			// Open the file and get the size
+			fIn = fopen(fname, "rb");
+			if (!fIn) {
+				printf("FATAL: Error opening %s", fname);
+				exit(-1);
+			}
+			fseek(fIn, 0, SEEK_END);
+			int fileSize = ftell(fIn);
+			fseek(fIn, 0, SEEK_SET);
+			btPage._lea[fileNum]._size = fileSize;
+
+			// Allocate buffer space for the file
+			byte *buffer = (byte *)malloc(fileSize);
+
+			// Read it in, encrypt it, and write it out
+			fread(buffer, 1, fileSize, fIn);
+			writeData(volDat, buffer, fileSize);
+
+			free(buffer);
+			fclose(fIn);
+		}
+
+		// Write out the page
+		writeData(volCat, (byte *)&btPage, sizeof(BtPage));
+	}
+
+	fclose(volCat);
+	fclose(volDat);
+}
+
+
+int main(int argc,  const char *argv[]) {
+	if (argc !=  2) {
+		printf("Usage:\n\t%s <option>\n", argv[0]);
+		printf("where option is\n");
+		printf("\t-e\tExtract Soltys game data (generates files.txt)\n");
+		printf("\t-p\tPack Soltys game data (requires files.txt)\n");
+		return -1;
+	}
+ 
+	const char *option = argv[1];
+	if (!strcmp(option, "-e"))
+		unpack();
+	else if (!strcmp(option, "-p"))
+		pack();
+	else
+		printf("Invalid option specified\n");
+	return 0;
+}
+
diff --git a/engines/cge/compress_cge.h b/engines/cge/compress_cge.h
new file mode 100644
index 0000000..54046ca
--- /dev/null
+++ b/engines/cge/compress_cge.h
@@ -0,0 +1,74 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef __COMPRESS_CGE_H
+#define __COMPRESS_CGE_H
+
+typedef unsigned char byte;
+typedef unsigned char uint8;
+typedef unsigned short int uint16;
+typedef unsigned long int uint32;
+
+#pragma pack(1)
+
+/**
+ * The following defines are copied from the cge engine file btfile.h
+ */
+#define kBtSize      1024
+#define kBtKeySize   13
+#define kBtLevel     2
+
+
+struct BtKeypack {
+	char _key[kBtKeySize];
+	uint32 _mark;
+	uint16 _size;
+};
+
+struct Inner {
+	uint8 _key[kBtKeySize];
+	uint16 _down;
+};
+
+struct Hea {
+	uint16 _count;
+	uint16 _down;
+};
+
+#define INN_SIZE ((kBtSize - sizeof(Hea)) / sizeof(Inner))
+#define LEA_SIZE ((kBtSize - sizeof(Hea)) / sizeof(BtKeypack))
+
+struct BtPage {
+	Hea _hea;
+	union {
+		// dummy filler to make proper size of union
+		uint8 _data[kBtSize - sizeof(Hea)];
+		// inner version of data: key + word-sized page link
+		Inner _inn[(kBtSize - sizeof(Hea)) / sizeof(Inner)];
+		// leaf version of data: key + all user data
+		BtKeypack _lea[(kBtSize - sizeof(Hea)) / sizeof(BtKeypack)];
+	};
+};
+
+#pragma pack()
+
+#endif






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