/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla Communicator client code, released * March 31, 1998. * * The Initial Developer of the Original Code is * Netscape Communications Corporation. * Portions created by the Initial Developer are Copyright (C) 1998 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Daniel Veditz * Samir Gehani * Mitch Stoltz * Jeroen Dobbelaere * Jeff Walden * Taras Glek * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ /* * This module implements a simple archive extractor for the PKZIP format. * * The underlying nsZipArchive is NOT thread-safe. Do not pass references * or pointers to it across thread boundaries. */ #define READTYPE PRInt32 #include "zlib.h" #include "nsISupportsUtils.h" #include "nsRecyclingAllocator.h" #include "prio.h" #include "plstr.h" #include "prlog.h" #include "stdlib.h" #include "nsWildCard.h" #include "zipfile.h" #include "zipstruct.h" #include "nsZipArchive.h" /** * Globals * * Global allocator used with zlib. Destroyed in module shutdown. */ #define NBUCKETS 6 #define BY4ALLOC_ITEMS 320 nsRecyclingAllocator *gZlibAllocator = NULL; // For placement new used for arena allocations of zip file list #include NEW_H #define ZIP_ARENABLOCKSIZE (1*1024) #ifdef XP_UNIX #include #include #include #include #elif defined(XP_WIN) || defined(XP_OS2) #include #elif defined(XP_BEOS) #include #endif #ifdef __SYMBIAN32__ #include #endif /*__SYMBIAN32__*/ #ifndef XP_UNIX /* we need some constants defined in limits.h and unistd.h */ # ifndef S_IFMT # define S_IFMT 0170000 # endif # ifndef S_IFLNK # define S_IFLNK 0120000 # endif # ifndef PATH_MAX # define PATH_MAX 1024 # endif #endif /* XP_UNIX */ #include "zipfile.h" #include "zipstruct.h" #include "nsZipArchive.h" static PRUint16 xtoint(unsigned char *ii); static PRUint32 xtolong(unsigned char *ll); static PRUint16 ExtractMode(unsigned char *ll); static PRUint32 HashName(const char* aName); #if defined(XP_UNIX) || defined(XP_BEOS) static PRBool IsSymlink(unsigned char *ll); static nsresult ResolveSymlink(const char *path); #endif //*********************************************************** // Allocators for use with zlib // // These are allocators that are performance tuned for // use with zlib. Our use of zlib for every file we read from // the jar file when running navigator, we do these allocation. // alloc 24 // alloc 64 // alloc 11520 // alloc 32768 // alloc 1216 [304x4] max // alloc 76 [19x4] // free 76 [19x4] // alloc 1152 [288x4] // free 1152 [288x4] // free 1216 [304x4] // alloc 28 // free 28 // free 32768 // free 11520 // free 64 // free 24 // // The pool will allocate these as: // // 32,768 // 11,520 // 1,280 [320x4] - shared by first x4 alloc, 28 // 1,280 [320x4] - shared by second and third x4 alloc // 64 // 24 // ------ // 46,936 // // And almost all of the file reads happen serially. Hence this // allocator tries to keep one set of memory needed for one file around // and reused the same blocks for other file reads. // // The interesting question is when should be free this ? // - memory pressure should be one. // - after startup of navigator // - after startup of mail // In general, this allocator should be enabled before // we startup and disabled after we startup if memory is a concern. //*********************************************************** static void * zlibAlloc(void *opaque, uInt items, uInt size) { nsRecyclingAllocator *zallocator = (nsRecyclingAllocator *)opaque; if (zallocator) { // Bump up x4 allocations PRUint32 realitems = items; if (size == 4 && items < BY4ALLOC_ITEMS) realitems = BY4ALLOC_ITEMS; return zallocator->Calloc(realitems, size); } else return calloc(items, size); } static void zlibFree(void *opaque, void *ptr) { nsRecyclingAllocator *zallocator = (nsRecyclingAllocator *)opaque; if (zallocator) zallocator->Free(ptr); else free(ptr); return; } nsresult gZlibInit(z_stream *zs) { memset(zs, 0, sizeof(z_stream)); //-- ensure we have our zlib allocator for better performance if (!gZlibAllocator) { gZlibAllocator = new nsRecyclingAllocator(NBUCKETS, NS_DEFAULT_RECYCLE_TIMEOUT, "libjar"); } if (gZlibAllocator) { zs->zalloc = zlibAlloc; zs->zfree = zlibFree; zs->opaque = gZlibAllocator; } int zerr = inflateInit2(zs, -MAX_WBITS); if (zerr != Z_OK) return ZIP_ERR_MEMORY; return ZIP_OK; } nsZipHandle::nsZipHandle() : mFd(nsnull) , mFileData(nsnull) , mLen(0) , mMap(nsnull) , mRefCnt(0) { MOZ_COUNT_CTOR(nsZipHandle); } NS_IMPL_THREADSAFE_ADDREF(nsZipHandle) NS_IMPL_THREADSAFE_RELEASE(nsZipHandle) nsresult nsZipHandle::Init(PRFileDesc *fd, nsZipHandle **ret) { PRInt64 size = PR_Available64(fd); if (size >= PR_INT32_MAX) return NS_ERROR_FILE_TOO_BIG; PRFileMap *map = PR_CreateFileMap(fd, size, PR_PROT_READONLY); if (!map) return NS_ERROR_FAILURE; nsZipHandle *handle = new nsZipHandle(); if (!handle) { PR_CloseFileMap(map); return NS_ERROR_OUT_OF_MEMORY; } handle->mFd = fd; handle->mMap = map; handle->mLen = (PRUint32) size; handle->mFileData = (PRUint8*) PR_MemMap(map, 0, handle->mLen); handle->AddRef(); *ret = handle; return NS_OK; } nsZipHandle::~nsZipHandle() { if (mFileData) { PR_MemUnmap(mFileData, mLen); PR_CloseFileMap(mMap); mFileData = nsnull; mMap = nsnull; } if (mFd) { PR_Close(mFd); mFd = nsnull; } MOZ_COUNT_DTOR(nsZipHandle); } //*********************************************************** // nsZipArchive -- public methods //*********************************************************** //--------------------------------------------- // nsZipArchive::OpenArchive //--------------------------------------------- nsresult nsZipArchive::OpenArchive(PRFileDesc * fd) { nsresult rv = nsZipHandle::Init(fd, getter_AddRefs(mFd)); if (NS_FAILED(rv)) return rv; // Initialize our arena PL_INIT_ARENA_POOL(&mArena, "ZipArena", ZIP_ARENABLOCKSIZE); //-- get table of contents for archive return BuildFileList(); } //--------------------------------------------- // nsZipArchive::Test //--------------------------------------------- nsresult nsZipArchive::Test(const char *aEntryName) { nsZipItem* currItem; if (aEntryName) // only test specified item { currItem = GetItem(aEntryName); if (!currItem) return ZIP_ERR_FNF; //-- don't test (synthetic) directory items if (currItem->isDirectory) return ZIP_OK; return ExtractFile(currItem, 0, 0); } // test all items in archive for (int i = 0; i < ZIP_TABSIZE; i++) { for (currItem = mFiles[i]; currItem; currItem = currItem->next) { //-- don't test (synthetic) directory items if (currItem->isDirectory) continue; nsresult rv = ExtractFile(currItem, 0, 0); if (rv != ZIP_OK) return rv; } } return ZIP_OK; } //--------------------------------------------- // nsZipArchive::CloseArchive //--------------------------------------------- nsresult nsZipArchive::CloseArchive() { if (mFd) { PL_FinishArenaPool(&mArena); mFd = NULL; } // CAUTION: // We don't need to delete each of the nsZipItem as the memory for // the zip item and the filename it holds are both allocated from the Arena. // Hence, destroying the Arena is like destroying all the memory // for all the nsZipItem in one shot. But if the ~nsZipItem is doing // anything more than cleaning up memory, we should start calling it. // Let us also cleanup the mFiles table for re-use on the next 'open' call memset(mFiles, 0, sizeof(mFiles)); mBuiltSynthetics = false; return ZIP_OK; } //--------------------------------------------- // nsZipArchive::GetItem //--------------------------------------------- nsZipItem* nsZipArchive::GetItem(const char * aEntryName) { if (aEntryName) { //-- If the request is for a directory, make sure that synthetic entries //-- are created for the directories without their own entry. if (!mBuiltSynthetics) { PRUint32 len = strlen(aEntryName); if ((len > 0) && (aEntryName[len-1] == '/')) { if (BuildSynthetics() != ZIP_OK) return 0; } } nsZipItem* item = mFiles[ HashName(aEntryName) ]; while (item) { if (!strcmp(aEntryName, item->name)) return item; //-- found it item = item->next; } } return 0; } //--------------------------------------------- // nsZipArchive::ExtractFile // This extracts the item to the filehandle provided. // If 'aFd' is null, it only tests the extraction. // On extraction error(s) it removes the file. // When needed, it also resolves the symlink. //--------------------------------------------- nsresult nsZipArchive::ExtractFile(nsZipItem *item, const char *outname, PRFileDesc* aFd) { if (!item) return ZIP_ERR_PARAM; if (!mFd) return ZIP_ERR_GENERAL; // Directory extraction is handled in nsJAR::Extract, // so the item to be extracted should never be a directory PR_ASSERT(!item->isDirectory); nsresult rv; //-- extract the file using the appropriate method switch(item->compression) { case STORED: rv = CopyItemToDisk(item, aFd); break; case DEFLATED: rv = InflateItem(item, aFd); break; default: //-- unsupported compression type rv = ZIP_ERR_UNSUPPORTED; } //-- delete the file on errors, or resolve symlink if needed if (aFd) { PR_Close(aFd); if (rv != ZIP_OK) PR_Delete(outname); #if defined(XP_UNIX) || defined(XP_BEOS) else if (item->isSymlink) rv = ResolveSymlink(outname); #endif } return rv; } //--------------------------------------------- // nsZipArchive::FindInit //--------------------------------------------- PRInt32 nsZipArchive::FindInit(const char * aPattern, nsZipFind **aFind) { if (!aFind) return ZIP_ERR_PARAM; // null out param in case an error happens *aFind = NULL; PRBool regExp = PR_FALSE; char* pattern = 0; // Create synthetic directory entries on demand nsresult rv = BuildSynthetics(); if (rv != ZIP_OK) return rv; // validate the pattern if (aPattern) { switch (NS_WildCardValid((char*)aPattern)) { case INVALID_SXP: return ZIP_ERR_PARAM; case NON_SXP: regExp = PR_FALSE; break; case VALID_SXP: regExp = PR_TRUE; break; default: // undocumented return value from RegExpValid! PR_ASSERT(PR_FALSE); return ZIP_ERR_PARAM; } pattern = PL_strdup(aPattern); if (!pattern) return ZIP_ERR_MEMORY; } *aFind = new nsZipFind(this, pattern, regExp); if (!*aFind) { PL_strfree(pattern); return ZIP_ERR_MEMORY; } return ZIP_OK; } //--------------------------------------------- // nsZipFind::FindNext //--------------------------------------------- nsresult nsZipFind::FindNext(const char ** aResult) { if (!mArchive || !aResult) return ZIP_ERR_PARAM; *aResult = 0; // we start from last match, look for next while (mSlot < ZIP_TABSIZE) { // move to next in current chain, or move to new slot mItem = mItem ? mItem->next : mArchive->mFiles[mSlot]; PRBool found = PR_FALSE; if (!mItem) ++mSlot; // no more in this chain, move to next slot else if (!mPattern) found = PR_TRUE; // always match else if (mRegExp) found = (NS_WildCardMatch(mItem->name, mPattern, PR_FALSE) == MATCH); else found = (PL_strcmp(mItem->name, mPattern) == 0); if (found) { *aResult = mItem->name; return ZIP_OK; } } return ZIP_ERR_FNF; } #if defined(XP_UNIX) || defined(XP_BEOS) //--------------------------------------------- // ResolveSymlink //--------------------------------------------- static nsresult ResolveSymlink(const char *path) { PRFileDesc * fIn = PR_Open(path, PR_RDONLY, 0000); if (!fIn) return ZIP_ERR_DISK; char buf[PATH_MAX+1]; PRInt32 length = PR_Read(fIn, (void*)buf, PATH_MAX); PR_Close(fIn); if ( (length <= 0) || ((buf[length] = 0, PR_Delete(path)) != 0) || (symlink(buf, path) != 0)) { return ZIP_ERR_DISK; } return ZIP_OK; } #endif //*********************************************************** // nsZipArchive -- private implementation //*********************************************************** #define BR_BUF_SIZE 1024 /* backward read buffer size */ //--------------------------------------------- // nsZipArchive::CreateZipItem //--------------------------------------------- nsZipItem* nsZipArchive::CreateZipItem(PRUint16 namelen) { // sizeof(nsZipItem) includes space for name's null byte // Arena allocate the nsZipItem void *mem; PL_ARENA_ALLOCATE(mem, &mArena, sizeof(nsZipItem)+namelen); return (nsZipItem*)mem; } //--------------------------------------------- // nsZipArchive::BuildFileList //--------------------------------------------- nsresult nsZipArchive::BuildFileList() { // Get archive size using end pos PRUint8* buf; PRUint8* endp = mFd->mFileData + mFd->mLen; for (buf = endp - ZIPEND_SIZE; xtolong(buf) != ENDSIG; buf--) { if (buf == mFd->mFileData) { // We're at the beginning of the file, and still no sign // of the end signature. File must be corrupted! return ZIP_ERR_CORRUPT; } } PRUint32 central = xtolong(((ZipEnd *)buf)->offset_central_dir); //-- Read the central directory headers buf = mFd->mFileData + central; PRUint32 sig = xtolong(buf); while (sig == CENTRALSIG) { // Make sure there is enough data available. if (endp - buf < ZIPCENTRAL_SIZE) return ZIP_ERR_CORRUPT; // Read the fixed-size data. ZipCentral* central = (ZipCentral*)buf; PRUint16 namelen = xtoint(central->filename_len); PRUint16 extralen = xtoint(central->extrafield_len); PRUint16 commentlen = xtoint(central->commentfield_len); // Sanity check variable sizes and refuse to deal with // anything too big: it's likely a corrupt archive. if (namelen > BR_BUF_SIZE || extralen > BR_BUF_SIZE || commentlen > 2*BR_BUF_SIZE) return ZIP_ERR_CORRUPT; nsZipItem* item = CreateZipItem(namelen); if (!item) return ZIP_ERR_MEMORY; item->headerOffset = xtolong(central->localhdr_offset); item->size = xtolong(central->size); item->realsize = xtolong(central->orglen); item->crc32 = xtolong(central->crc32); item->time = xtoint(central->time); item->date = xtoint(central->date); item->isSynthetic = PR_FALSE; item->compression = PR_MIN(xtoint(central->method), UNSUPPORTED); item->mode = ExtractMode(central->external_attributes); #if defined(XP_UNIX) || defined(XP_BEOS) // Check if item is a symlink item->isSymlink = IsSymlink(central->external_attributes); #endif buf += ZIPCENTRAL_SIZE; // Get the item name memcpy(item->name, buf, namelen); item->name[namelen] = 0; // An item whose name ends with '/' is a directory item->isDirectory = ('/' == item->name[namelen - 1]); // Add item to file table PRUint32 hash = HashName(item->name); item->next = mFiles[hash]; mFiles[hash] = item; // Point to the next item at the top of loop buf += namelen + extralen + commentlen; sig = xtolong(buf); } /* while reading central directory records */ if (sig != ENDSIG) return ZIP_ERR_CORRUPT; return ZIP_OK; } //--------------------------------------------- // nsZipArchive::BuildSynthetics //--------------------------------------------- nsresult nsZipArchive::BuildSynthetics() { if (mBuiltSynthetics) return ZIP_OK; mBuiltSynthetics = true; // Create synthetic entries for any missing directories. // Do this when all ziptable has scanned to prevent double entries. for (int i = 0; i < ZIP_TABSIZE; ++i) { for (nsZipItem* item = mFiles[i]; item != 0; item = item->next) { if (item->isSynthetic) continue; //-- add entries for directories in the current item's path //-- go from end to beginning, because then we can stop trying //-- to create diritems if we find that the diritem we want to //-- create already exists //-- start just before the last char so as to not add the item //-- twice if it's a directory PRUint16 namelen = strlen(item->name); for (char* p = item->name + namelen - 2; p >= item->name; p--) { if ('/' != *p) continue; // See whether we need to create any more implicit directories, // because if we don't we can avoid a lot of work. // We can even avoid (de)allocating space for a bogus dirname with // a little trickery -- save the char at item->name[dirnamelen], // set it to 0, compare the strings, and restore the saved // char when done const PRUint32 dirnamelen = p + 1 - item->name; const char savedChar = item->name[dirnamelen]; item->name[dirnamelen] = 0; // Is the directory in the file table? PRUint32 hash = HashName(item->name); PRBool found = PR_FALSE; for (nsZipItem* zi = mFiles[hash]; zi != NULL; zi = zi->next) { if (0 == strcmp(item->name, zi->name)) { // we've already added this dir and all its parents found = PR_TRUE; break; } } // restore the char immediately item->name[dirnamelen] = savedChar; // if the directory was found, break out of the directory // creation loop now that we know all implicit directories // are there -- otherwise, start creating the zip item if (found) break; nsZipItem* diritem = CreateZipItem(dirnamelen); if (!diritem) return ZIP_ERR_MEMORY; memcpy(diritem->name, item->name, dirnamelen); diritem->name[dirnamelen] = 0; diritem->isDirectory = PR_TRUE; diritem->isSynthetic = PR_TRUE; diritem->compression = STORED; diritem->size = diritem->realsize = 0; diritem->crc32 = 0; diritem->mode = 0755; // Set an obviously wrong last-modified date/time, because // finding something more accurate like the most recent // last-modified date/time of the dir's contents is a lot // of effort. The date/time corresponds to 1980-01-01 00:00. diritem->time = 0; diritem->date = 1 + (1 << 5) + (0 << 9); // add diritem to the file table diritem->next = mFiles[hash]; mFiles[hash] = diritem; } /* end processing of dirs in item's name */ } } return ZIP_OK; } nsZipHandle* nsZipArchive::GetFD() { if (!mFd) return NULL; return mFd.get(); } //--------------------------------------------- // nsZipArchive::GetData //--------------------------------------------- PRUint8* nsZipArchive::GetData(nsZipItem* aItem) { PR_ASSERT (aItem); //-- read local header to get variable length values and calculate //-- the real data offset if (aItem->headerOffset + ZIPLOCAL_SIZE > mFd->mLen) return nsnull; // -- check signature before using the structure, in case the zip file is corrupt ZipLocal* Local = (ZipLocal*)(mFd->mFileData + aItem->headerOffset); if ((xtolong(Local->signature) != LOCALSIG)) return nsnull; //-- NOTE: extralen is different in central header and local header //-- for archives created using the Unix "zip" utility. To set //-- the offset accurately we need the _local_ extralen. PRUint32 dataOffset = aItem->headerOffset + ZIPLOCAL_SIZE + xtoint(Local->filename_len) + xtoint(Local->extrafield_len); // -- check if there is enough source data in the file if (dataOffset + aItem->size > mFd->mLen) return nsnull; return mFd->mFileData + dataOffset; } //--------------------------------------------- // nsZipArchive::CopyItemToDisk //--------------------------------------------- nsresult nsZipArchive::CopyItemToDisk(nsZipItem *item, PRFileDesc* outFD) { PR_ASSERT(item); //-- get to the start of file's data const PRUint8* itemData = GetData(item); if (!itemData) return ZIP_ERR_CORRUPT; if (outFD && PR_Write(outFD, itemData, item->size) < (READTYPE)item->size) { //-- Couldn't write all the data (disk full?) return ZIP_ERR_DISK; } //-- Calculate crc PRUint32 crc = crc32(0L, (const unsigned char*)itemData, item->size); //-- verify crc32 if (crc != item->crc32) return ZIP_ERR_CORRUPT; return ZIP_OK; } //--------------------------------------------- // nsZipArchive::InflateItem //--------------------------------------------- nsresult nsZipArchive::InflateItem(nsZipItem * item, PRFileDesc* outFD) /* * This function inflates an archive item to disk, to the * file specified by outFD. If outFD is zero, the extracted data is * not written, only checked for CRC, so this is in effect same as 'Test'. */ { PR_ASSERT(item); //-- allocate deflation buffers Bytef outbuf[ZIP_BUFLEN]; //-- set up the inflate z_stream zs; nsresult status = gZlibInit(&zs); if (status != ZIP_OK) return ZIP_ERR_GENERAL; //-- inflate loop zs.avail_in = item->size; zs.next_in = (Bytef*)GetData(item); if (!zs.next_in) return ZIP_ERR_CORRUPT; PRUint32 crc = crc32(0L, Z_NULL, 0); int zerr = Z_OK; while (zerr == Z_OK) { zs.next_out = outbuf; zs.avail_out = ZIP_BUFLEN; zerr = inflate(&zs, Z_PARTIAL_FLUSH); if (zerr != Z_OK && zerr != Z_STREAM_END) { status = (zerr == Z_MEM_ERROR) ? ZIP_ERR_MEMORY : ZIP_ERR_CORRUPT; break; } PRUint32 count = zs.next_out - outbuf; //-- incrementally update crc32 crc = crc32(crc, (const unsigned char*)outbuf, count); if (outFD && PR_Write(outFD, outbuf, count) < (READTYPE)count) { status = ZIP_ERR_DISK; break; } } // while //-- free zlib internal state inflateEnd(&zs); //-- verify crc32 if ((status == ZIP_OK) && (crc != item->crc32)) { status = ZIP_ERR_CORRUPT; } return status; } //------------------------------------------ // nsZipArchive constructor and destructor //------------------------------------------ nsZipArchive::nsZipArchive() : mBuiltSynthetics(false) { MOZ_COUNT_CTOR(nsZipArchive); // initialize the table to NULL memset(mFiles, 0, sizeof(mFiles)); } nsZipArchive::~nsZipArchive() { CloseArchive(); MOZ_COUNT_DTOR(nsZipArchive); } //------------------------------------------ // nsZipFind constructor and destructor //------------------------------------------ nsZipFind::nsZipFind(nsZipArchive* aZip, char* aPattern, PRBool aRegExp) : mArchive(aZip), mPattern(aPattern), mItem(0), mSlot(0), mRegExp(aRegExp) { MOZ_COUNT_CTOR(nsZipFind); } nsZipFind::~nsZipFind() { PL_strfree(mPattern); MOZ_COUNT_DTOR(nsZipFind); } //------------------------------------------ // helper functions //------------------------------------------ /* * HashName * * returns a hash key for the entry name */ static PRUint32 HashName(const char* aName) { PR_ASSERT(aName != 0); PRUint32 val = 0; for (PRUint8* c = (PRUint8*)aName; *c != 0; c++) { val = val*37 + *c; } return (val % ZIP_TABSIZE); } /* * x t o i n t * * Converts a two byte ugly endianed integer * to our platform's integer. */ static PRUint16 xtoint (unsigned char *ii) { return (PRUint16) ((ii [0]) | (ii [1] << 8)); } /* * x t o l o n g * * Converts a four byte ugly endianed integer * to our platform's integer. */ static PRUint32 xtolong (unsigned char *ll) { return (PRUint32)( (ll [0] << 0) | (ll [1] << 8) | (ll [2] << 16) | (ll [3] << 24) ); } /* * ExtractMode * * Extracts bits 17-24 from a 32-bit unsigned long * representation of the external attributes field. * Subsequently it tacks on the implicit user-read * bit. */ static PRUint16 ExtractMode(unsigned char *ll) { return ((PRUint16)(ll[2])) | 0x0100; } #if defined(XP_UNIX) || defined(XP_BEOS) /* * * Return true if the attributes are for a symbolic link * */ static PRBool IsSymlink(unsigned char *ll) { return ((xtoint(ll+2) & S_IFMT) == S_IFLNK); } #endif