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gecko/modules/libjar/nsZipArchive.cpp
Taras Glek 5d45eb36a4 Bug 541828 - Do not crash on small invalid jar files r=alfredkayser 
--HG--
extra : rebase_source : c8dd6d99b4e86d60e85e08eab4100df74c629ad4
2010-03-26 10:19:53 -07:00

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/* -*- 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 <dveditz@netscape.com>
* Samir Gehani <sgehani@netscape.com>
* Mitch Stoltz <mstoltz@netscape.com>
* Jeroen Dobbelaere <jeroen.dobbelaere@acunia.com>
* Jeff Walden <jwalden+code@mit.edu>
* Taras Glek <tglek@mozilla.com>
*
* 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 "nsZipArchive.h"
/**
* Global allocator used with zlib. Destroyed in module shutdown.
*/
#define NBUCKETS 6
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 <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <unistd.h>
#elif defined(XP_WIN) || defined(XP_OS2)
#include <io.h>
#elif defined(XP_BEOS)
#include <unistd.h>
#endif
#ifdef __SYMBIAN32__
#include <sys/syslimits.h>
#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 */
static const PRUint32 kMaxNameLength = PATH_MAX; /* Maximum name length */
// For synthetic zip entries. Date/time corresponds to 1980-01-01 00:00.
static const PRUint16 kSyntheticTime = 0;
static const PRUint16 kSyntheticDate = (1 + (1 << 5) + (0 << 9));
static PRUint16 xtoint(const PRUint8 *ii);
static PRUint32 xtolong(const PRUint8 *ll);
static PRUint32 HashName(const char* aName, PRUint16 nameLen);
#if defined(XP_UNIX) || defined(XP_BEOS)
static nsresult ResolveSymlink(const char *path);
#endif
//***********************************************************
// Allocators for use with zlib
//
// Use a recycling allocator, for re-use of of the zlib buffers.
// For every inflation the following allocations are done:
// zlibAlloc(1, 9520)
// zlibAlloc(32768, 1)
//***********************************************************
static void *
zlibAlloc(void *opaque, uInt items, uInt size)
{
nsRecyclingAllocator *zallocator = (nsRecyclingAllocator *)opaque;
if (zallocator) {
return gZlibAllocator->Malloc(items * size);
}
return malloc(items * size);
}
static void
zlibFree(void *opaque, void *ptr)
{
nsRecyclingAllocator *zallocator = (nsRecyclingAllocator *)opaque;
if (zallocator)
zallocator->Free(ptr);
else
free(ptr);
}
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 NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
nsZipHandle::nsZipHandle()
: 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;
PRUint8 *buf = (PRUint8*) PR_MemMap(map, 0, (PRUint32) size);
// Bug 525755: PR_MemMap fails when fd points at something other than a normal file.
if (!buf) {
PR_CloseFileMap(map);
return NS_ERROR_FAILURE;
}
nsZipHandle *handle = new nsZipHandle();
if (!handle) {
PR_MemUnmap(buf, size);
PR_CloseFileMap(map);
return NS_ERROR_OUT_OF_MEMORY;
}
handle->mMap = map;
handle->mLen = (PRUint32) size;
handle->mFileData = buf;
handle->AddRef();
*ret = handle;
return NS_OK;
}
nsZipHandle::~nsZipHandle()
{
if (mFileData) {
PR_MemUnmap(mFileData, mLen);
PR_CloseFileMap(mMap);
mFileData = nsnull;
mMap = nsnull;
}
MOZ_COUNT_DTOR(nsZipHandle);
}
//***********************************************************
// nsZipArchive -- public methods
//***********************************************************
//---------------------------------------------
// nsZipArchive::OpenArchive
//---------------------------------------------
nsresult nsZipArchive::OpenArchive(nsIFile *aZipFile)
{
nsresult rv;
nsCOMPtr<nsILocalFile> localFile = do_QueryInterface(aZipFile, &rv);
if (NS_FAILED(rv)) return rv;
PRFileDesc* fd;
rv = localFile->OpenNSPRFileDesc(PR_RDONLY, 0000, &fd);
if (NS_FAILED(rv)) return rv;
rv = nsZipHandle::Init(fd, getter_AddRefs(mFd));
PR_Close(fd);
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 NS_ERROR_FILE_TARGET_DOES_NOT_EXIST;
//-- don't test (synthetic) directory items
if (currItem->IsDirectory())
return NS_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 != NS_OK)
return rv;
}
}
return NS_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 NS_OK;
}
//---------------------------------------------
// nsZipArchive::GetItem
//---------------------------------------------
nsZipItem* nsZipArchive::GetItem(const char * aEntryName)
{
if (aEntryName) {
PRUint32 len = strlen(aEntryName);
//-- If the request is for a directory, make sure that synthetic entries
//-- are created for the directories without their own entry.
if (!mBuiltSynthetics) {
if ((len > 0) && (aEntryName[len-1] == '/')) {
if (BuildSynthetics() != NS_OK)
return 0;
}
}
nsZipItem* item = mFiles[ HashName(aEntryName, len) ];
while (item) {
if ((len == item->nameLength) &&
(!memcmp(aEntryName, item->Name(), len)))
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 NS_ERROR_ILLEGAL_VALUE;
if (!mFd)
return NS_ERROR_FAILURE;
// 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 = NS_ERROR_NOT_IMPLEMENTED;
}
//-- delete the file on errors, or resolve symlink if needed
if (aFd) {
PR_Close(aFd);
if (rv != NS_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 NS_ERROR_ILLEGAL_VALUE;
// 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 != NS_OK)
return rv;
// validate the pattern
if (aPattern)
{
switch (NS_WildCardValid((char*)aPattern))
{
case INVALID_SXP:
return NS_ERROR_ILLEGAL_VALUE;
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 NS_ERROR_ILLEGAL_VALUE;
}
pattern = PL_strdup(aPattern);
if (!pattern)
return NS_ERROR_OUT_OF_MEMORY;
}
*aFind = new nsZipFind(this, pattern, regExp);
if (!*aFind) {
PL_strfree(pattern);
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
//---------------------------------------------
// nsZipFind::FindNext
//---------------------------------------------
nsresult nsZipFind::FindNext(const char ** aResult, PRUint16 *aNameLen)
{
if (!mArchive || !aResult || !aNameLen)
return NS_ERROR_ILLEGAL_VALUE;
*aResult = 0;
*aNameLen = 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)
{
char buf[kMaxNameLength+1];
memcpy(buf, mItem->Name(), mItem->nameLength);
buf[mItem->nameLength]='\0';
found = (NS_WildCardMatch(buf, mPattern, PR_FALSE) == MATCH);
}
else
found = ((mItem->nameLength == strlen(mPattern)) &&
(memcmp(mItem->Name(), mPattern, mItem->nameLength) == 0));
if (found) {
// Need also to return the name length, as it is NOT zero-terminatdd...
*aResult = mItem->Name();
*aNameLen = mItem->nameLength;
return NS_OK;
}
}
return NS_ERROR_FILE_TARGET_DOES_NOT_EXIST;
}
#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 NS_ERROR_FILE_DISK_FULL;
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 NS_ERROR_FILE_DISK_FULL;
}
return NS_OK;
}
#endif
//***********************************************************
// nsZipArchive -- private implementation
//***********************************************************
//---------------------------------------------
// nsZipArchive::CreateZipItem
//---------------------------------------------
nsZipItem* nsZipArchive::CreateZipItem()
{
// Arena allocate the nsZipItem
void *mem;
PL_ARENA_ALLOCATE(mem, &mArena, sizeof(nsZipItem));
return (nsZipItem*)mem;
}
//---------------------------------------------
// nsZipArchive::BuildFileList
//---------------------------------------------
nsresult nsZipArchive::BuildFileList()
{
// Get archive size using end pos
PRUint8* buf;
PRUint8* startp = mFd->mFileData;
PRUint8* endp = startp + mFd->mLen;
PRUint32 centralOffset = 0;
for (buf = endp - ZIPEND_SIZE; buf > startp; buf--)
{
if (xtolong(buf) == ENDSIG) {
centralOffset = xtolong(((ZipEnd *)buf)->offset_central_dir);
break;
}
}
if (!centralOffset)
return NS_ERROR_FILE_CORRUPTED;
//-- Read the central directory headers
buf = startp + centralOffset;
if (endp - buf < PRInt32(sizeof(PRUint32)))
return NS_ERROR_FILE_CORRUPTED;
PRUint32 sig = xtolong(buf);
while (sig == CENTRALSIG) {
// Make sure there is enough data available.
if (endp - buf < ZIPCENTRAL_SIZE)
return NS_ERROR_FILE_CORRUPTED;
// 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);
// Point to the next item at the top of loop
buf += ZIPCENTRAL_SIZE + namelen + extralen + commentlen;
// Sanity check variable sizes and refuse to deal with
// anything too big: it's likely a corrupt archive.
if (namelen > kMaxNameLength || buf >= endp)
return NS_ERROR_FILE_CORRUPTED;
nsZipItem* item = CreateZipItem();
if (!item)
return NS_ERROR_OUT_OF_MEMORY;
item->central = central;
item->nameLength = namelen;
item->isSynthetic = false;
// Add item to file table
PRUint32 hash = HashName(item->Name(), namelen);
item->next = mFiles[hash];
mFiles[hash] = item;
sig = xtolong(buf);
} /* while reading central directory records */
if (sig != ENDSIG)
return NS_ERROR_FILE_CORRUPTED;
return NS_OK;
}
//---------------------------------------------
// nsZipArchive::BuildSynthetics
//---------------------------------------------
nsresult nsZipArchive::BuildSynthetics()
{
if (mBuiltSynthetics)
return NS_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 = item->nameLength;
const char *name = item->Name();
for (PRUint16 dirlen = namelen - 1; dirlen > 0; dirlen--)
{
if (name[dirlen-1] != '/')
continue;
// Is the directory already in the file table?
PRUint32 hash = HashName(item->Name(), dirlen);
PRBool found = PR_FALSE;
for (nsZipItem* zi = mFiles[hash]; zi != NULL; zi = zi->next)
{
if ((dirlen == zi->nameLength) &&
(0 == memcmp(item->Name(), zi->Name(), dirlen)))
{
// we've already added this dir and all its parents
found = PR_TRUE;
break;
}
}
// 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();
if (!diritem)
return NS_ERROR_OUT_OF_MEMORY;
// Point to the central record of the original item for the name part.
diritem->central = item->central;
diritem->nameLength = dirlen;
diritem->isSynthetic = true;
// add diritem to the file table
diritem->next = mFiles[hash];
mFiles[hash] = diritem;
} /* end processing of dirs in item's name */
}
}
return NS_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
PRUint32 len = mFd->mLen;
PRUint8* data = mFd->mFileData;
PRUint32 offset = aItem->LocalOffset();
if (offset + ZIPLOCAL_SIZE > len)
return nsnull;
// -- check signature before using the structure, in case the zip file is corrupt
ZipLocal* Local = (ZipLocal*)(data + offset);
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.
offset += ZIPLOCAL_SIZE +
xtoint(Local->filename_len) +
xtoint(Local->extrafield_len);
// -- check if there is enough source data in the file
if (offset + aItem->Size() > len)
return nsnull;
return data + offset;
}
//---------------------------------------------
// 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 NS_ERROR_FILE_CORRUPTED;
if (outFD && PR_Write(outFD, itemData, item->Size()) < (READTYPE)item->Size())
{
//-- Couldn't write all the data (disk full?)
return NS_ERROR_FILE_DISK_FULL;
}
//-- Calculate crc
PRUint32 crc = crc32(0L, (const unsigned char*)itemData, item->Size());
//-- verify crc32
if (crc != item->CRC32())
return NS_ERROR_FILE_CORRUPTED;
return NS_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 != NS_OK)
return NS_ERROR_FAILURE;
//-- inflate loop
zs.avail_in = item->Size();
zs.next_in = (Bytef*)GetData(item);
if (!zs.next_in)
return NS_ERROR_FILE_CORRUPTED;
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) ? NS_ERROR_OUT_OF_MEMORY : NS_ERROR_FILE_CORRUPTED;
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 = NS_ERROR_FILE_DISK_FULL;
break;
}
} // while
//-- free zlib internal state
inflateEnd(&zs);
//-- verify crc32
if ((status == NS_OK) && (crc != item->CRC32()))
{
status = NS_ERROR_FILE_CORRUPTED;
}
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, PRUint16 len)
{
PR_ASSERT(aName != 0);
const PRUint8* p = (const PRUint8*)aName;
const PRUint8* endp = p + len;
PRUint32 val = 0;
while (p != endp) {
val = val*37 + *p++;
}
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 (const PRUint8 *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 (const PRUint8 *ll)
{
return (PRUint32)( (ll [0] << 0) |
(ll [1] << 8) |
(ll [2] << 16) |
(ll [3] << 24) );
}
/*
* GetModTime
*
* returns last modification time in microseconds
*/
static PRTime GetModTime(PRUint16 aDate, PRUint16 aTime)
{
// Note that on DST shift we can't handle correctly the hour that is valid
// in both DST zones
PRExplodedTime time;
time.tm_usec = 0;
time.tm_hour = (aTime >> 11) & 0x1F;
time.tm_min = (aTime >> 5) & 0x3F;
time.tm_sec = (aTime & 0x1F) * 2;
time.tm_year = (aDate >> 9) + 1980;
time.tm_month = ((aDate >> 5) & 0x0F) - 1;
time.tm_mday = aDate & 0x1F;
time.tm_params.tp_gmt_offset = 0;
time.tm_params.tp_dst_offset = 0;
PR_NormalizeTime(&time, PR_GMTParameters);
time.tm_params.tp_gmt_offset = PR_LocalTimeParameters(&time).tp_gmt_offset;
PR_NormalizeTime(&time, PR_GMTParameters);
time.tm_params.tp_dst_offset = PR_LocalTimeParameters(&time).tp_dst_offset;
return PR_ImplodeTime(&time);
}
PRUint32 nsZipItem::LocalOffset()
{
return xtolong(central->localhdr_offset);
}
PRUint32 nsZipItem::Size()
{
return isSynthetic ? 0 : xtolong(central->size);
}
PRUint32 nsZipItem::RealSize()
{
return isSynthetic ? 0 : xtolong(central->orglen);
}
PRUint32 nsZipItem::CRC32()
{
return isSynthetic ? 0 : xtolong(central->crc32);
}
PRUint16 nsZipItem::Date()
{
return isSynthetic ? kSyntheticDate : xtoint(central->date);
}
PRUint16 nsZipItem::Time()
{
return isSynthetic ? kSyntheticTime : xtoint(central->time);
}
PRUint16 nsZipItem::Compression()
{
return isSynthetic ? STORED : xtoint(central->method);
}
bool nsZipItem::IsDirectory()
{
return isSynthetic || ((nameLength > 0) && ('/' == Name()[nameLength - 1]));
}
PRUint16 nsZipItem::Mode()
{
if (isSynthetic) return 0755;
return ((PRUint16)(central->external_attributes[2]) | 0x100);
}
const PRUint8 * nsZipItem::GetExtraField(PRUint16 aTag, PRUint16 *aBlockSize)
{
if (isSynthetic) return NULL;
const unsigned char *buf = ((const unsigned char*)central) + ZIPCENTRAL_SIZE +
nameLength;
PRUint32 buflen = (PRUint32)xtoint(central->extrafield_len);
PRUint32 pos = 0;
PRUint16 tag, blocksize;
while (buf && (pos + 4) <= buflen) {
tag = xtoint(buf + pos);
blocksize = xtoint(buf + pos + 2);
if (aTag == tag && (pos + 4 + blocksize) <= buflen) {
*aBlockSize = blocksize;
return buf + pos;
}
pos += blocksize + 4;
}
return NULL;
}
PRTime nsZipItem::LastModTime()
{
if (isSynthetic) return GetModTime(kSyntheticDate, kSyntheticTime);
// Try to read timestamp from extra field
PRUint16 blocksize;
const PRUint8 *tsField = GetExtraField(EXTENDED_TIMESTAMP_FIELD, &blocksize);
if (tsField && blocksize >= 5 && tsField[4] & EXTENDED_TIMESTAMP_MODTIME) {
return (PRTime)(xtolong(tsField + 5)) * PR_USEC_PER_SEC;
}
return GetModTime(Date(), Time());
}
#if defined(XP_UNIX) || defined(XP_BEOS)
bool nsZipItem::IsSymlink()
{
if (isSynthetic) return false;
return (xtoint(central->external_attributes+2) & S_IFMT) == S_IFLNK;
}
#endif
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