root/trunk/contrib/extractor/libmpq/mpq.cpp @ 177

/*
 *  mpq.c -- functions for developers using libmpq.
 *
 *  Copyright (C) 2003 Maik Broemme <mbroemme@plusserver.de>
 *
 *  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 int unsigned 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;
                        }
                case LIBMPQ_FILE_TYPE_CHAR:
                        for (i = 0; mpq_a->mpq_l->mpq_files[i]; i++) {
                                sprintf(tempfile, (char *)mpq_a->mpq_l->mpq_files[i], i);
                                if (strncmp(tempfile, (char *)file, strlen((char *)file)) == 0) {

                                        /* if file found break */
                                        found = 1;
                                        break;
                                }
                        }

                        /* if a file was found return 0 */
                        if (found == 1) {
                                return LIBMPQ_TOOLS_SUCCESS;
                        } else {
                                return LIBMPQ_EFILE_NOT_FOUND;
                        }
                default:
                        return LIBMPQ_TOOLS_SUCCESS;
        }
}

/*
 *  This function extracts a file from a MPQ archive
 *  by the given number.
 */
int libmpq_file_extract(mpq_archive *mpq_a, const int number, const char *filename) {
        int blockindex = number; //-1;
        int fd = 0;
        int i = 0;
        char buffer[0x1000];
        //char tempfile[PATH_MAX];
        unsigned int transferred = 1;
        mpq_file *mpq_f = NULL;
        mpq_block *mpq_b = NULL;
        mpq_hash *mpq_h = NULL;

/*      if (number < 1 || number > mpq_a->header->blocktablesize) {
                return LIBMPQ_EINV_RANGE;
        }*/
/*
        sprintf(tempfile, libmpq_file_name(mpq_a, number));
*/
        /* check if mpq_f->filename could be written here. */
        fd = _open(filename, O_RDWR|O_CREAT|O_TRUNC, 0644);
        if (fd == LIBMPQ_EFILE) {
                return LIBMPQ_EFILE;
        }

        /* 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;
        }

        /* allocate memory for file structure */
        mpq_f = (mpq_file *)malloc(sizeof(mpq_file));
        if (!mpq_f) {
                return LIBMPQ_EALLOCMEM;
        }

        /* initialize file structure */
        memset(mpq_f, 0, sizeof(mpq_file));
        mpq_f->fd             = fd;
        mpq_f->mpq_b          = mpq_b;
        mpq_f->nblocks        = (mpq_f->mpq_b->fsize + mpq_a->blocksize - 1) / mpq_a->blocksize;
        mpq_f->mpq_h          = mpq_h;
        mpq_f->accessed       = FALSE;
        mpq_f->blockposloaded = FALSE;
        sprintf((char *)mpq_f->filename, filename);

        /* allocate buffers for decompression. */
        if (mpq_f->mpq_b->flags & LIBMPQ_FILE_COMPRESSED) {

                /*
                 *  Allocate buffer for block positions. At the begin of file are stored
                 *  unsigned ints holding positions of each block relative from begin of
                 *  file in the archive.
                 */
                if ((mpq_f->blockpos = (unsigned int *)malloc(sizeof(int) * mpq_f->nblocks + 1)) == NULL) {
                        return LIBMPQ_EALLOCMEM;
                }
        }

        while (transferred > 0) {
                transferred = libmpq_file_read_file(mpq_a, mpq_f, mpq_f->filepos, buffer, sizeof(buffer));
                if (transferred == 0) {
                        break;
                } else {
                        mpq_f->accessed  = TRUE;
                        mpq_f->filepos  += transferred;
                }

                transferred = _write(mpq_f->fd, buffer, transferred);
                if (transferred == 0) {
                        break;
                }
        }

        _close(fd);

        /* freeing the file structure */
        free(mpq_f);
        return LIBMPQ_TOOLS_SUCCESS;
}

/*
 *  This function tries to get the filenames for the hashes. It uses
 *  an internal listfile database and gets the correct listfile from
 *  some specific archive informations.
 */

int libmpq_listfile_open(mpq_archive *mpq_a, char file[PATH_MAX]) {
        FILE *fp;
        //char **filelist;
        int i = 0;
        //int fl_count;
        //int fl_size;
        int fl_count_fb;
        int fl_size_fb;
        int result = LIBMPQ_TOOLS_SUCCESS;
        struct stat statbuf;

        /* get file status */
        if (stat(file, &statbuf) < 0) {
                result = LIBMPQ_CONF_EFILE_NOT_FOUND;
        }

        /* check if file is a filename or directory */
        /*if (S_ISDIR(statbuf.st_mode)) {

                // allocate memory for the file list
                filelist = (char **)malloc(LIBMPQ_CONF_FL_INCREMENT * sizeof(char *));
                fl_count = 0;
                fl_size = LIBMPQ_CONF_FL_INCREMENT;

                // check if it is a valid listfile
                if (libmpq_detect_listfile_rec(file, &filelist, &fl_count, &fl_size)) {
                        filelist == NULL;
                }

                filelist[fl_count] = NULL;

                // return if no listfile was found
                if (filelist == NULL) {
                        result = LIBMPQ_CONF_EFILE_NOT_FOUND;
                }

                for (i = 0; filelist[i]; i++) {
                        if ((fp = fopen(filelist[i], "r")) != NULL ) {
                                result = libmpq_read_listfile(mpq_a, fp);
                                fclose(fp);
                        }
                }

                // freeing the listfile struct
                libmpq_free_listfile(filelist);
        }*/

        /* if file is a regular file use it */
        //if (S_ISREG(statbuf.st_mode)) {

                /* if specific listfile was forced. */
                if ((fp = fopen(file, "r")) != NULL ) {
                        result = libmpq_read_listfile(mpq_a, fp);
                        fclose(fp);
                } else {
                        result = LIBMPQ_CONF_EFILE_OPEN;
                }
        //}

        /* if error occured we need to create a fallback filelist. */
        if (mpq_a->mpq_l->mpq_files == NULL) {

                /* allocate memory for the file list */
                mpq_a->mpq_l->mpq_files = (unsigned char **)malloc(LIBMPQ_CONF_FL_INCREMENT * sizeof(char *));
                fl_count_fb = 0;
                fl_size_fb = LIBMPQ_CONF_FL_INCREMENT;

                for (i = 0; i < libmpq_archive_info(mpq_a, LIBMPQ_MPQ_NUMFILES); i++) {

                        /* set the next filelist entry to a copy of the file */
                        mpq_a->mpq_l->mpq_files[fl_count_fb++] = (unsigned char *)_strdup("file%06lu.xxx");

                        /* increase the array size */
                        if (fl_count_fb == fl_size_fb) {
                                mpq_a->mpq_l->mpq_files = (unsigned char **)realloc(mpq_a->mpq_l->mpq_files, (fl_size_fb + LIBMPQ_CONF_FL_INCREMENT) * sizeof(char *));
                                fl_size_fb += LIBMPQ_CONF_FL_INCREMENT;
                        }
                }
                mpq_a->mpq_l->mpq_files[fl_count_fb] = NULL;

                /* if no error occurs and no listfile was assigned, we think there was no matching listfile. */
                if (result == 0) {
                        result = LIBMPQ_CONF_EFILE_NOT_FOUND;
                }
        }

        return result;
}

/*
 *  This function frees the allocated memory for the listfile.
 */
int libmpq_listfile_close(mpq_archive *mpq_a) {
        int i = 0;

        /* safety check if we really have a filelist. */
        if (mpq_a->mpq_l->mpq_files != NULL) {
                /* freeing the filelist */
                while (mpq_a->mpq_l->mpq_files[i]) {
                        free(mpq_a->mpq_l->mpq_files[i++]);
                }
                free(mpq_a->mpq_l->mpq_files);
        }
    return 0;
}

int libmpq_file_getdata(mpq_archive *mpq_a, mpq_hash mpq_h, const int number, unsigned char *dest) {
        int blockindex = number; //-1;
        int i = 0;
        mpq_file *mpq_f = NULL;
        mpq_block *mpq_b = NULL;
        int success = 0;

        /*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;
        }

        /* allocate memory for file structure */
        mpq_f = (mpq_file*)malloc(sizeof(mpq_file));
        if (!mpq_f) {
                return LIBMPQ_EALLOCMEM;
        }

        /* initialize file structure */
        memset(mpq_f, 0, sizeof(mpq_file));
        mpq_f->mpq_b          = mpq_b;
        mpq_f->nblocks        = (mpq_f->mpq_b->fsize + mpq_a->blocksize - 1) / mpq_a->blocksize;
        mpq_f->mpq_h          = &mpq_h;
        mpq_f->accessed       = FALSE;
        mpq_f->blockposloaded = FALSE;

        /* allocate buffers for decompression. */
        if (mpq_f->mpq_b->flags & LIBMPQ_FILE_COMPRESSED) {

                /*
                 *  Allocate buffer for block positions. At the begin of file are stored
                 *  unsigned ints holding positions of each block relative from begin of
                 *  file in the archive.
                 */
                if ((mpq_f->blockpos = (unsigned int*)malloc(sizeof(int) * (mpq_f->nblocks + 1))) == NULL) {
                        return LIBMPQ_EALLOCMEM;
                }
        }

    if(libmpq_file_read_file(mpq_a, mpq_f, 0, (char*)dest, mpq_b->fsize) == mpq_b->fsize)
        success = 1;

    if (mpq_f->mpq_b->flags & LIBMPQ_FILE_COMPRESSED) {
        // Free buffer for block positions
                
               free(mpq_f->blockpos);
        }
        /* freeing the file structure */
        free(mpq_f);
        return success?LIBMPQ_TOOLS_SUCCESS:LIBMPQ_EFILE_CORRUPT;
}