361 lines
7.1 KiB
C
361 lines
7.1 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#define UPKG_MAGIC 0x9E2A83C1
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typedef struct
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{
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uint32_t magic;
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uint16_t pkgver, license;
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uint32_t flags, nnames, onames, nexports, oexports, nimports, oimports;
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} upkg_header_t;
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uint8_t *pkgfile;
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upkg_header_t *head;
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size_t fpos = 0;
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uint8_t readbyte( void )
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{
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uint8_t val = pkgfile[fpos];
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fpos++;
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return val;
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}
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uint16_t readword( void )
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{
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uint16_t val = *(uint16_t*)(pkgfile+fpos);
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fpos += 2;
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return val;
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}
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uint32_t readdword( void )
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{
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uint32_t val = *(uint32_t*)(pkgfile+fpos);
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fpos += 4;
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return val;
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}
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float readfloat( void )
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{
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float val = *(float*)(pkgfile+fpos);
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fpos += 4;
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return val;
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}
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#define READSTRUCT(x,y) {memcpy(&x,pkgfile+fpos,sizeof(y));fpos+=sizeof(y);}
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// reads a compact index value
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int32_t readindex( void )
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{
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uint8_t byte[5] = {0};
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byte[0] = readbyte();
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if ( !byte[0] ) return 0;
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if ( byte[0]&0x40 )
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{
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for ( int i=1; i<5; i++ )
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{
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byte[i] = readbyte();
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if ( !(byte[i]&0x80) ) break;
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}
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}
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int32_t tf = byte[0]&0x3f;
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tf |= (int32_t)(byte[1]&0x7f)<<6;
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tf |= (int32_t)(byte[2]&0x7f)<<13;
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tf |= (int32_t)(byte[3]&0x7f)<<20;
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tf |= (int32_t)(byte[4]&0x7f)<<27;
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if ( byte[0]&0x80 ) tf *= -1;
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return tf;
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}
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// reads a name table entry
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size_t readname( int *olen )
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{
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size_t pos = fpos;
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if ( head->pkgver >= 64 )
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{
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int32_t len = readindex();
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pos = fpos;
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if ( olen ) *olen = len;
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if ( len <= 0 ) return pos;
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fpos += len;
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}
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else
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{
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int c, p = 0;
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while ( (c = readbyte()) ) p++;
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if ( olen ) *olen = p;
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}
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fpos += 4;
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return pos;
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}
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size_t getname( int index, int *olen )
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{
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size_t prev = fpos;
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fpos = head->onames;
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size_t npos = 0;
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for ( int i=0; i<=index; i++ )
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npos = readname(olen);
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fpos = prev;
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return npos;
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}
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// checks if a name exists
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int hasname( const char *needle )
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{
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if ( !needle ) return 0;
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size_t prev = fpos;
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fpos = head->onames;
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int found = 0;
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int nlen = strlen(needle);
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for ( uint32_t i=0; i<head->nnames; i++ )
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{
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int32_t len = 0;
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if ( head->pkgver >= 64 )
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{
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len = readindex();
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if ( len <= 0 ) continue;
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}
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int c = 0, p = 0, match = 1;
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while ( (c = readbyte()) )
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{
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if ( (p >= nlen) || (needle[p] != c) ) match = 0;
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p++;
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if ( len && (p > len) ) break;
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}
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if ( match )
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{
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found = 1;
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break;
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}
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fpos += 4;
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}
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fpos = prev;
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return found;
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}
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// read import table entry and return index of its object name
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int32_t readimport( void )
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{
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readindex();
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readindex();
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if ( head->pkgver >= 60 ) fpos += 4;
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else readindex();
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return readindex();
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}
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int32_t getimport( int index )
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{
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size_t prev = fpos;
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fpos = head->oimports;
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int32_t iname = 0;
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for ( int i=0; i<=index; i++ )
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iname = readimport();
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fpos = prev;
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return iname;
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}
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// fully read import table entry
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void readimport2( int32_t *cpkg, int32_t *cname, int32_t *pkg, int32_t *name )
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{
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*cpkg = readindex();
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*cname = readindex();
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if ( head->pkgver >= 60 ) *pkg = readdword();
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else *pkg = readindex();
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*name = readindex();
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}
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void getimport2( int index, int32_t *cpkg, int32_t *cname, int32_t *pkg,
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int32_t *name )
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{
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size_t prev = fpos;
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fpos = head->oimports;
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for ( int i=0; i<=index; i++ )
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readimport2(cpkg,cname,pkg,name);
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fpos = prev;
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}
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// read export table entry
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void readexport( int32_t *class, int32_t *ofs, int32_t *siz, int32_t *name )
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{
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*class = readindex();
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readindex();
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if ( head->pkgver >= 60 ) fpos += 4;
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*name = readindex();
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fpos += 4;
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*siz = readindex();
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if ( *siz > 0 ) *ofs = readindex();
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}
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void getexport( int index, int32_t *class, int32_t *ofs, int32_t *siz,
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int32_t *name )
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{
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size_t prev = fpos;
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fpos = head->oexports;
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for ( int i=0; i<=index; i++ )
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readexport(class,ofs,siz,name);
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fpos = prev;
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}
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// fully read export table entry
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void readexport2( int32_t *class, int32_t *super, int32_t *pkg, int32_t *name,
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uint32_t *flags, int32_t *siz, int32_t *ofs )
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{
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*class = readindex();
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*super = readindex();
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if ( head->pkgver >= 60 ) *pkg = readdword();
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else *pkg = readindex();
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*name = readindex();
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*flags = readdword();
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*siz = readindex();
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if ( *siz > 0 ) *ofs = readindex();
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}
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void getexport2( int index, int32_t *class, int32_t *super, int32_t *pkg,
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int32_t *name, uint32_t *flags, int32_t *siz, int32_t *ofs )
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{
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size_t prev = fpos;
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fpos = head->oexports;
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for ( int i=0; i<=index; i++ )
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readexport2(class,super,pkg,name,flags,siz,ofs);
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fpos = prev;
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}
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int main( int argc, char **argv )
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{
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if ( argc < 2 )
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{
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printf("Usage: unrundeleter <map file>\n");
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return 1;
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}
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int fd = open(argv[1],O_RDWR);
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if ( fd == -1 )
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{
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printf("Failed to open file %s: %s\n",argv[1],strerror(errno));
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return 1;
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}
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struct stat st;
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fstat(fd,&st);
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pkgfile = malloc(st.st_size);
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memset(pkgfile,0,st.st_size);
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head = (upkg_header_t*)pkgfile;
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int r = 0;
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do
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{
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r = read(fd,pkgfile+fpos,131072);
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if ( r == -1 )
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{
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close(fd);
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free(pkgfile);
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printf("Read failed for file %s: %s\n",argv[1],
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strerror(errno));
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return 4;
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}
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fpos += r;
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}
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while ( r > 0 );
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close(fd);
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fpos = 0;
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if ( head->magic != UPKG_MAGIC )
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{
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printf("File %s is not a valid unreal package!\n",argv[1]);
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free(pkgfile);
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return 2;
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}
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if ( !hasname("bDeleteMe") )
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{
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printf("Package %s does not contain deleted exports\n",argv[1]);
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free(pkgfile);
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return 4;
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}
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// loop through exports and search for bDeleteMe properties
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fpos = head->oexports;
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for ( uint32_t i=0; i<head->nexports; i++ )
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{
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int32_t class, ofs, siz, name;
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readexport(&class,&ofs,&siz,&name);
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if ( (siz <= 0) || (class >= 0) ) continue;
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// check the class
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class = -class-1;
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if ( (uint32_t)class > head->nimports ) continue;
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// read name
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int32_t l = 0;
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char *ename = (char*)(pkgfile+getname(name,&l));
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printf("checking %.*s\n",l,ename);
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// begin reading data
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size_t prev = fpos;
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fpos = ofs;
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if ( head->pkgver < 40 ) fpos += 8;
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if ( head->pkgver < 60 ) fpos += 16;
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int32_t prop = readindex();
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if ( (uint32_t)prop >= head->nnames )
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{
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printf("Unknown property %d, skipping\n",prop);
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fpos = prev;
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continue;
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}
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char *pname = (char*)(pkgfile+getname(prop,&l));
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retry:
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if ( strncasecmp(pname,"none",l) )
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{
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uint8_t info = readbyte();
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int ptype = info&0xf;
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int psiz = (info>>4)&0x7;
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int parr = (info>>7)&0x1;
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switch ( psiz )
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{
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case 0:
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psiz = 1;
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break;
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case 1:
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psiz = 2;
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break;
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case 2:
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psiz = 4;
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break;
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case 3:
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psiz = 12;
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break;
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case 4:
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psiz = 16;
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break;
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case 5:
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psiz = readbyte();
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break;
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case 6:
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psiz = readword();
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break;
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case 7:
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psiz = readdword();
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break;
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}
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fpos += psiz;
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printf(" %zu: Skipping property %.*s of size %d and type %d (%d)\n",fpos,l,pname,psiz,ptype,parr);
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if ( (ptype != 3) && parr )
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{
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printf("%d\n",readbyte());
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return 1;
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}
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prop = readindex();
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printf("prop: %d\n",prop);
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pname = (char*)(pkgfile+getname(prop,&l));
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// TODO figure out how the fuck structs and arrays actually are structured
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// because the documentation for this is illegible
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if ( ptype == 10 )
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{
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}
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goto retry;
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}
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fpos = prev;
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}
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free(pkgfile);
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return 0;
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}
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