mpq.cpp

魔兽解压DBC的一些功能代码,专门用来分解魔兽客户端所使用的代码

/*
 *  mpq.c -- functions for developers using libmpq.
 *
 *  Copyright (C) 2003 Maik Broemme <[e-mail]>
 *
 *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id: mpq.c,v 1.6 2004/02/12 00:49:00 mbroemme Exp $
 */
#define _CRT_SECURE_NO_DEPRECATE

#include <stdlib.h>
#include <sys/stat.h>
//#include <unistd.h>
//#include <io.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include "mpq.h"
#include "common.h"

/*
 *  This function returns version information.
 *  format: MAJOR.MINOR.PATCH
 */
char *libmpq_version() {
	static char version[10];
	sprintf(version, "%i.%i.%i", LIBMPQ_MAJOR_VERSION, LIBMPQ_MINOR_VERSION, LIBMPQ_PATCH_VERSION);
	return version;
}

/*
 *  This function reads a file and verify if it is a legit MPQ archive
 *  or not. Then it fills the mpq_header structure and reads the hash
 *  table.
 */
int libmpq_archive_open(mpq_archive *mpq_a, unsigned char *mpq_filename) {
	int fd = 0;
	int rb = 0;
	int ncnt = FALSE;
	struct stat fileinfo;

	/* allocate memory */
	mpq_a->mpq_l = (mpq_list *)malloc(sizeof(mpq_list));
	memset(mpq_a->mpq_l, 0, sizeof(mpq_list));
	mpq_a->header = (mpq_header *)malloc(sizeof(mpq_header));
	memset(mpq_a->header, 0, sizeof(mpq_header));

	/* Check if file exists and is readable */
	fd = _open((char *)mpq_filename, MPQ_FILE_OPEN_FLAGS);
	if (fd == LIBMPQ_EFILE) {
		return LIBMPQ_EFILE;
	}

	/* fill the structures with informations */
	strcpy((char *)mpq_a->filename, (char *)mpq_filename);
	libmpq_init_buffer(mpq_a);
	mpq_a->fd               = fd;
	mpq_a->header->id       = 0;
	mpq_a->maxblockindex    = 0;
	mpq_a->mpq_l->mpq_files = NULL;

    mpq_a->mpqpos = 0; //k

	while (!ncnt) {
		mpq_a->header->id = 0;
		#ifdef WIN32
			_lseeki64(mpq_a->fd, mpq_a->mpqpos, SEEK_SET);
		#else
			lseek64(mpq_a->fd, mpq_a->mpqpos, SEEK_SET);
		#endif
		rb = _read(mpq_a->fd, mpq_a->header, sizeof(mpq_header));

		/* if different number of bytes read, break the loop */
		if (rb != sizeof(mpq_header)) {
			return LIBMPQ_EFILE_FORMAT;
		}

		/* special offset for protected MPQs */
		if (mpq_a->header->offset == LIBMPQ_HEADER_W3M) {
			mpq_a->flags |= LIBMPQ_FLAG_PROTECTED;
			mpq_a->header->offset = sizeof(mpq_header);
		}

		/* if valid signature has been found, break the loop */
        if (mpq_a->header->id == LIBMPQ_ID_MPQ) {
            ncnt = true;
        }
        /*if (mpq_a->header->id == LIBMPQ_ID_MPQ &&
		    mpq_a->header->offset == sizeof(mpq_header) &&
		    mpq_a->header->hashtablepos < mpq_a->header->archivesize &&
		    mpq_a->header->blocktablepos < mpq_a->header->archivesize) {
			ncnt = TRUE;
		}*/

		/* move to the next possible offset */
		if (!ncnt) {
			mpq_a->mpqpos += 0x200;
		}
	}

	/* get the right positions of the hash table and the block table. */
	mpq_a->blocksize = (0x200 << mpq_a->header->blocksize);
	fstat(mpq_a->fd, &fileinfo);

	/* Normal MPQs must have position of */
	/*if (mpq_a->header->hashtablepos + mpq_a->mpqpos < fileinfo.st_size &&
	    mpq_a->header->blocktablepos + mpq_a->mpqpos < fileinfo.st_size) {
		mpq_a->header->hashtablepos  += mpq_a->mpqpos;
		mpq_a->header->blocktablepos += mpq_a->mpqpos;
	} else {
		return LIBMPQ_EFILE_FORMAT;
	}*/

	/* Try to read and decrypt the hashtable */
	if (libmpq_read_hashtable(mpq_a) != 0) {
		return LIBMPQ_EHASHTABLE;
	}

	/* Try to read and decrypt the blocktable */
	if (libmpq_read_blocktable(mpq_a) != 0) {
		return LIBMPQ_EBLOCKTABLE;
	}

	return LIBMPQ_TOOLS_SUCCESS;
}

/*
 *  This function closes the file descriptor opened by
 *  mpq_open_archive(); and frees the decryption buffer.
 */
int libmpq_archive_close(mpq_archive *mpq_a) {
	memset(mpq_a->buf, 0, sizeof(mpq_a->buf));

	/* free the allocated memory. */
	free(mpq_a->header);
	free(mpq_a->mpq_l);

	/* Check if file descriptor is valid. */
	if ((_close(mpq_a->fd)) == LIBMPQ_EFILE) {
		return LIBMPQ_EFILE;
	}

	return LIBMPQ_TOOLS_SUCCESS;
}

/*
 * This function returns the value for the given infotype.
 * If an error occurs something < 0 is returned.
 */
int libmpq_archive_info(mpq_archive *mpq_a, unsigned int infotype) {
	unsigned int filecount = 0;
	unsigned int fsize = 0;
	unsigned int csize = 0;
	mpq_block *mpq_b_end = mpq_a->blocktable + mpq_a->header->blocktablesize;
	mpq_block *mpq_b = NULL;

	switch (infotype) {
		case LIBMPQ_MPQ_ARCHIVE_SIZE:
			return mpq_a->header->archivesize;
		case LIBMPQ_MPQ_HASHTABLE_SIZE:
			return mpq_a->header->hashtablesize;
		case LIBMPQ_MPQ_BLOCKTABLE_SIZE:
			return mpq_a->header->blocktablesize;
		case LIBMPQ_MPQ_BLOCKSIZE:
			return mpq_a->blocksize;
		case LIBMPQ_MPQ_NUMFILES:
			for (mpq_b = mpq_a->blocktable; mpq_b < mpq_b_end; mpq_b++) {
				filecount++;
			}
			return filecount;
		case LIBMPQ_MPQ_COMPRESSED_SIZE:
			for (mpq_b = mpq_a->blocktable; mpq_b < mpq_b_end; mpq_b++) {
				csize += mpq_b->csize;
			}
			return csize;
		case LIBMPQ_MPQ_UNCOMPRESSED_SIZE:
			for (mpq_b = mpq_a->blocktable; mpq_b < mpq_b_end; mpq_b++) {
				fsize += mpq_b->fsize;
			}
			return fsize;
		default:
			return LIBMPQ_TOOLS_SUCCESS;
	}
}

/*
 * This function returns some useful file information.
 */
int libmpq_file_info(mpq_archive *mpq_a, unsigned int infotype, const unsigned int number) {
	int blockindex = number; //-1;
	int i = 0;
	mpq_block *mpq_b = NULL;
	mpq_hash *mpq_h = NULL;

	/* check if given number is not out of range */
	if (number < 1 || number > mpq_a->header->blocktablesize) {
		return LIBMPQ_EINV_RANGE;
	}

	/* search for correct hashtable */
	/*for (i = 0; i < mpq_a->header->hashtablesize; i++) {
		if ((number - 1) == (mpq_a->hashtable[i]).blockindex) {
			blockindex = (mpq_a->hashtable[i]).blockindex;
			mpq_h = &(mpq_a->hashtable[i]);
			break;
		}
	}*/

	/* check if file was found */
	/*if (blockindex == -1 || blockindex > mpq_a->header->blocktablesize) {
		return LIBMPQ_EFILE_NOT_FOUND;
	}*/

	/* check if sizes are correct */
	mpq_b = mpq_a->blocktable + blockindex;
	if (mpq_b->filepos > (mpq_a->header->archivesize + mpq_a->mpqpos) || mpq_b->csize > mpq_a->header->archivesize) {
		return LIBMPQ_EFILE_CORRUPT;
	}

	/* check if file exists */
	if ((mpq_b->flags & LIBMPQ_FILE_EXISTS) == 0) {
		return LIBMPQ_EFILE_NOT_FOUND;
	}

	switch (infotype) {
		case LIBMPQ_FILE_COMPRESSED_SIZE:
			return mpq_b->csize;
		case LIBMPQ_FILE_UNCOMPRESSED_SIZE:
			return mpq_b->fsize;
		case LIBMPQ_FILE_COMPRESSION_TYPE:
			if (mpq_b->flags & LIBMPQ_FILE_COMPRESS_PKWARE) {
				return LIBMPQ_FILE_COMPRESS_PKWARE;
			}
			if (mpq_b->flags & LIBMPQ_FILE_COMPRESS_MULTI) {
				return LIBMPQ_FILE_COMPRESS_MULTI;
			}
		default:
			return LIBMPQ_TOOLS_SUCCESS;
	}
}

/*
 * This function searches the listfile for the filename.
 * On success it returns the filename, otherwiese a name
 * like file000001.xxx and if number is out of range it
 * returns NULL.
 */
char *libmpq_file_name(mpq_archive *mpq_a, const int number) {
	static char tempfile[PATH_MAX];

	/* check if we are in the range of available files. */
	if (number > libmpq_archive_info(mpq_a, LIBMPQ_MPQ_NUMFILES) || number < 1) {
		return NULL;
	}

	/* this is safe because we built a fallback filelist, if something was wrong. */
	sprintf(tempfile, (char *)mpq_a->mpq_l->mpq_files[number - 1], number);

	return tempfile;
}

/*
 *  This function returns the number to the given
 *  filename.
 */
int libmpq_file_number(mpq_archive *mpq_a, const char *name) {
	int i;
	char tempfile[PATH_MAX];

	for (i = 0; mpq_a->mpq_l->mpq_files[i]; i++) {
		sprintf(tempfile, (char *)mpq_a->mpq_l->mpq_files[i], i + 1);
		if (strncmp(tempfile, name, strlen(name)) == 0) {

			/* if file found return the number */
			return i + 1;
		}
	}

	/* if no matching entry found return LIBMPQ_EFILE_NOT_FOUND */
	return LIBMPQ_EFILE_NOT_FOUND;
}

/*
 *  This function verifies if a given file (by number
 *  or name) is in the opened mpq archive. On success
 *  it returns 0, otherwise LIBMPQ_EFILE_NOT_FOUND.
 */
int libmpq_file_check(mpq_archive *mpq_a, void *file, int type) {
	int found = 0;
	int i;
	char tempfile[PATH_MAX];

	switch (type) {
		case LIBMPQ_FILE_TYPE_INT:

			/* check if we are in the range of available files. */
			if (*(int *)file > libmpq_archive_info(mpq_a, LIBMPQ_MPQ_NUMFILES) || *(int *)file < 1) {
				return LIBMPQ_EFILE_NOT_FOUND;
			} else {
				return LIBMPQ_TOOLS_SUCCESS;
			}