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gecko-dev/modules/libjar/nsZipArchive.cpp

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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 "zipstruct.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 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
//
// 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 (gZlibAllocator) {
return gZlibAllocator->Calloc(items, size);
}
return calloc(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()
: 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 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) {
//-- 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() != NS_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 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)
{
if (!mArchive || !aResult)
return NS_ERROR_ILLEGAL_VALUE;
*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 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
//***********************************************************
#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 NS_ERROR_FILE_CORRUPTED;
}
}
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 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);
// 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 NS_ERROR_FILE_CORRUPTED;
nsZipItem* item = CreateZipItem(namelen);
if (!item)
return NS_ERROR_OUT_OF_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 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 = 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 NS_ERROR_OUT_OF_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 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
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 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)
{
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
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