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nsZipArchive.cpp
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nsZipArchive.cpp
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* 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 int32_t
#include "zlib.h"
#ifdef MOZ_JAR_BROTLI
#include "decode.h" // brotli
#endif
#include "nsISupportsUtils.h"
#include "prio.h"
#include "plstr.h"
#include "mozilla/Logging.h"
#include "mozilla/UniquePtrExtensions.h"
#include "stdlib.h"
#include "nsWildCard.h"
#include "nsZipArchive.h"
#include "nsString.h"
#include "prenv.h"
#if defined(XP_WIN)
#include <windows.h>
#endif
// For placement new used for arena allocations of zip file list
#include <new>
#define ZIP_ARENABLOCKSIZE (1*1024)
#ifdef XP_UNIX
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <unistd.h>
#elif defined(XP_WIN)
#include <io.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 */
#ifdef XP_WIN
#include "private/pprio.h" // To get PR_ImportFile
#endif
using namespace mozilla;
static const uint32_t kMaxNameLength = PATH_MAX; /* Maximum name length */
// For synthetic zip entries. Date/time corresponds to 1980-01-01 00:00.
static const uint16_t kSyntheticTime = 0;
static const uint16_t kSyntheticDate = (1 + (1 << 5) + (0 << 9));
static uint16_t xtoint(const uint8_t *ii);
static uint32_t xtolong(const uint8_t *ll);
static uint32_t HashName(const char* aName, uint16_t nameLen);
#ifdef XP_UNIX
static nsresult ResolveSymlink(const char *path);
#endif
class ZipArchiveLogger {
public:
void Write(const nsACString &zip, const char *entry) const {
if (!fd) {
char *env = PR_GetEnv("MOZ_JAR_LOG_FILE");
if (!env)
return;
nsCOMPtr<nsIFile> logFile;
nsresult rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(env), false, getter_AddRefs(logFile));
if (NS_FAILED(rv))
return;
// Create the log file and its parent directory (in case it doesn't exist)
rv = logFile->Create(nsIFile::NORMAL_FILE_TYPE, 0644);
if (NS_FAILED(rv))
return;
PRFileDesc* file;
#ifdef XP_WIN
// PR_APPEND is racy on Windows, so open a handle ourselves with flags that
// will work, and use PR_ImportFile to make it a PRFileDesc.
// This can go away when bug 840435 is fixed.
nsAutoString path;
logFile->GetPath(path);
if (path.IsEmpty())
return;
HANDLE handle = CreateFileW(path.get(), FILE_APPEND_DATA, FILE_SHARE_WRITE,
nullptr, OPEN_ALWAYS, 0, nullptr);
if (handle == INVALID_HANDLE_VALUE)
return;
file = PR_ImportFile((PROsfd)handle);
if (!file)
return;
#else
rv = logFile->OpenNSPRFileDesc(PR_WRONLY|PR_CREATE_FILE|PR_APPEND, 0644, &file);
if (NS_FAILED(rv))
return;
#endif
fd = file;
}
nsCString buf(zip);
buf.Append(' ');
buf.Append(entry);
buf.Append('\n');
PR_Write(fd, buf.get(), buf.Length());
}
void AddRef() {
MOZ_ASSERT(refCnt >= 0);
++refCnt;
}
void Release() {
MOZ_ASSERT(refCnt > 0);
if ((0 == --refCnt) && fd) {
PR_Close(fd);
fd = nullptr;
}
}
private:
int refCnt;
mutable PRFileDesc *fd;
};
static ZipArchiveLogger zipLog;
//***********************************************************
// For every inflation the following allocations are done:
// malloc(1 * 9520)
// malloc(32768 * 1)
//***********************************************************
nsresult gZlibInit(z_stream *zs)
{
memset(zs, 0, sizeof(z_stream));
int zerr = inflateInit2(zs, -MAX_WBITS);
if (zerr != Z_OK) return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
nsZipHandle::nsZipHandle()
: mFileData(nullptr)
, mLen(0)
, mMap(nullptr)
, mRefCnt(0)
, mFileStart(nullptr)
, mTotalLen(0)
{
}
NS_IMPL_ADDREF(nsZipHandle)
NS_IMPL_RELEASE(nsZipHandle)
nsresult nsZipHandle::Init(nsIFile *file, nsZipHandle **ret,
PRFileDesc **aFd)
{
mozilla::AutoFDClose fd;
int32_t flags = PR_RDONLY;
#if defined(XP_WIN)
flags |= nsIFile::OS_READAHEAD;
#endif
nsresult rv = file->OpenNSPRFileDesc(flags, 0000, &fd.rwget());
if (NS_FAILED(rv))
return rv;
int64_t size = PR_Available64(fd);
if (size >= INT32_MAX)
return NS_ERROR_FILE_TOO_BIG;
PRFileMap *map = PR_CreateFileMap(fd, size, PR_PROT_READONLY);
if (!map)
return NS_ERROR_FAILURE;
uint8_t *buf = (uint8_t*) PR_MemMap(map, 0, (uint32_t) 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;
}
RefPtr<nsZipHandle> handle = new nsZipHandle();
if (!handle) {
PR_MemUnmap(buf, (uint32_t) size);
PR_CloseFileMap(map);
return NS_ERROR_OUT_OF_MEMORY;
}
#if defined(XP_WIN)
if (aFd) {
*aFd = fd.forget();
}
#else
handle->mNSPRFileDesc = fd.forget();
#endif
handle->mMap = map;
handle->mFile.Init(file);
handle->mTotalLen = (uint32_t) size;
handle->mFileStart = buf;
rv = handle->findDataStart();
if (NS_FAILED(rv)) {
PR_MemUnmap(buf, (uint32_t) size);
PR_CloseFileMap(map);
return rv;
}
handle.forget(ret);
return NS_OK;
}
nsresult nsZipHandle::Init(nsZipArchive *zip, const char *entry,
nsZipHandle **ret)
{
RefPtr<nsZipHandle> handle = new nsZipHandle();
if (!handle)
return NS_ERROR_OUT_OF_MEMORY;
handle->mBuf = new nsZipItemPtr<uint8_t>(zip, entry);
if (!handle->mBuf)
return NS_ERROR_OUT_OF_MEMORY;
if (!handle->mBuf->Buffer())
return NS_ERROR_UNEXPECTED;
handle->mMap = nullptr;
handle->mFile.Init(zip, entry);
handle->mTotalLen = handle->mBuf->Length();
handle->mFileStart = handle->mBuf->Buffer();
nsresult rv = handle->findDataStart();
if (NS_FAILED(rv)) {
return rv;
}
handle.forget(ret);
return NS_OK;
}
nsresult nsZipHandle::Init(const uint8_t* aData, uint32_t aLen,
nsZipHandle **aRet)
{
RefPtr<nsZipHandle> handle = new nsZipHandle();
handle->mFileStart = aData;
handle->mTotalLen = aLen;
nsresult rv = handle->findDataStart();
if (NS_FAILED(rv)) {
return rv;
}
handle.forget(aRet);
return NS_OK;
}
// This function finds the start of the ZIP data. If the file is a regular ZIP,
// this is just the start of the file. If the file is a CRX file, the start of
// the data is after the CRX header.
// CRX header reference: (CRX version 2)
// Header requires little-endian byte ordering with 4-byte alignment.
// 32 bits : magicNumber - Defined as a |char m[] = "Cr24"|.
// Equivilant to |uint32_t m = 0x34327243|.
// 32 bits : version - Unsigned integer representing the CRX file
// format version. Currently equal to 2.
// 32 bits : pubKeyLength - Unsigned integer representing the length
// of the public key in bytes.
// 32 bits : sigLength - Unsigned integer representing the length
// of the signature in bytes.
// pubKeyLength : publicKey - Contents of the author's public key.
// sigLength : signature - Signature of the ZIP content.
// Signature is created using the RSA
// algorighm with the SHA-1 hash function.
nsresult nsZipHandle::findDataStart()
{
// In the CRX header, integers are 32 bits. Our pointer to the file is of
// type |uint8_t|, which is guaranteed to be 8 bits.
const uint32_t CRXIntSize = 4;
MOZ_WIN_MEM_TRY_BEGIN
if (mTotalLen > CRXIntSize * 4 && xtolong(mFileStart) == kCRXMagic) {
const uint8_t* headerData = mFileStart;
headerData += CRXIntSize * 2; // Skip magic number and version number
uint32_t pubKeyLength = xtolong(headerData);
headerData += CRXIntSize;
uint32_t sigLength = xtolong(headerData);
uint32_t headerSize = CRXIntSize * 4 + pubKeyLength + sigLength;
if (mTotalLen > headerSize) {
mLen = mTotalLen - headerSize;
mFileData = mFileStart + headerSize;
return NS_OK;
}
}
mLen = mTotalLen;
mFileData = mFileStart;
MOZ_WIN_MEM_TRY_CATCH(return NS_ERROR_FAILURE)
return NS_OK;
}
int64_t nsZipHandle::SizeOfMapping()
{
return mTotalLen;
}
nsresult nsZipHandle::GetNSPRFileDesc(PRFileDesc** aNSPRFileDesc)
{
if (!aNSPRFileDesc) {
return NS_ERROR_ILLEGAL_VALUE;
}
*aNSPRFileDesc = mNSPRFileDesc;
if (!mNSPRFileDesc) {
return NS_ERROR_NOT_AVAILABLE;
}
return NS_OK;
}
nsZipHandle::~nsZipHandle()
{
if (mMap) {
PR_MemUnmap((void *)mFileStart, mTotalLen);
PR_CloseFileMap(mMap);
}
mFileStart = nullptr;
mFileData = nullptr;
mMap = nullptr;
mBuf = nullptr;
}
//***********************************************************
// nsZipArchive -- public methods
//***********************************************************
//---------------------------------------------
// nsZipArchive::OpenArchive
//---------------------------------------------
nsresult nsZipArchive::OpenArchive(nsZipHandle *aZipHandle, PRFileDesc *aFd)
{
mFd = aZipHandle;
//-- get table of contents for archive
nsresult rv = BuildFileList(aFd);
if (NS_SUCCEEDED(rv)) {
if (aZipHandle->mFile)
aZipHandle->mFile.GetURIString(mURI);
}
return rv;
}
nsresult nsZipArchive::OpenArchive(nsIFile *aFile)
{
RefPtr<nsZipHandle> handle;
#if defined(XP_WIN)
mozilla::AutoFDClose fd;
nsresult rv = nsZipHandle::Init(aFile, getter_AddRefs(handle),
&fd.rwget());
#else
nsresult rv = nsZipHandle::Init(aFile, getter_AddRefs(handle));
#endif
if (NS_FAILED(rv))
return rv;
#if defined(XP_WIN)
return OpenArchive(handle, fd.get());
#else
return OpenArchive(handle);
#endif
}
//---------------------------------------------
// 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 (auto* item : mFiles) {
for (currItem = item; 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) {
mArena.Clear();
mFd = nullptr;
}
// 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) {
uint32_t 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;
}
}
MOZ_WIN_MEM_TRY_BEGIN
nsZipItem* item = mFiles[ HashName(aEntryName, len) ];
while (item) {
if ((len == item->nameLength) &&
(!memcmp(aEntryName, item->Name(), len))) {
// Successful GetItem() is a good indicator that the file is about to be read
zipLog.Write(mURI, aEntryName);
return item; //-- found it
}
item = item->next;
}
MOZ_WIN_MEM_TRY_CATCH(return nullptr)
}
return nullptr;
}
//---------------------------------------------
// 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
MOZ_ASSERT(!item->IsDirectory());
Bytef outbuf[ZIP_BUFLEN];
nsZipCursor cursor(item, this, outbuf, ZIP_BUFLEN, true);
nsresult rv = NS_OK;
while (true) {
uint32_t count = 0;
uint8_t* buf = cursor.Read(&count);
if (!buf) {
nsZipArchive::sFileCorruptedReason = "nsZipArchive: Read() failed to return a buffer";
rv = NS_ERROR_FILE_CORRUPTED;
break;
}
if (count == 0) {
break;
}
if (aFd && PR_Write(aFd, buf, count) < (READTYPE)count) {
rv = NS_ERROR_FILE_DISK_FULL;
break;
}
}
//-- delete the file on errors, or resolve symlink if needed
if (aFd) {
PR_Close(aFd);
if (rv != NS_OK)
PR_Delete(outname);
#ifdef XP_UNIX
else if (item->IsSymlink())
rv = ResolveSymlink(outname);
#endif
}
return rv;
}
//---------------------------------------------
// nsZipArchive::FindInit
//---------------------------------------------
nsresult
nsZipArchive::FindInit(const char * aPattern, nsZipFind **aFind)
{
if (!aFind)
return NS_ERROR_ILLEGAL_VALUE;
// null out param in case an error happens
*aFind = nullptr;
bool regExp = 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 = false;
break;
case VALID_SXP:
regExp = true;
break;
default:
// undocumented return value from RegExpValid!
MOZ_ASSERT(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, uint16_t *aNameLen)
{
if (!mArchive || !aResult || !aNameLen)
return NS_ERROR_ILLEGAL_VALUE;
*aResult = 0;
*aNameLen = 0;
MOZ_WIN_MEM_TRY_BEGIN
// 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];
bool found = false;
if (!mItem)
++mSlot; // no more in this chain, move to next slot
else if (!mPattern)
found = 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, 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;
}
}
MOZ_WIN_MEM_TRY_CATCH(return NS_ERROR_FAILURE)
return NS_ERROR_FILE_TARGET_DOES_NOT_EXIST;
}
#ifdef XP_UNIX
//---------------------------------------------
// 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];
int32_t length = PR_Read(fIn, (void*)buf, PATH_MAX);
PR_Close(fIn);
if (length <= 0) {
return NS_ERROR_FILE_DISK_FULL;
}
buf[length] = '\0';
if (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
return (nsZipItem*)mArena.Allocate(sizeof(nsZipItem));
}
//---------------------------------------------
// nsZipArchive::BuildFileList
//---------------------------------------------
nsresult nsZipArchive::BuildFileList(PRFileDesc *aFd)
{
// Get archive size using end pos
const uint8_t* buf;
const uint8_t* startp = mFd->mFileData;
const uint8_t* endp = startp + mFd->mLen;
MOZ_WIN_MEM_TRY_BEGIN
uint32_t centralOffset = 4;
if (mFd->mLen > ZIPCENTRAL_SIZE && xtolong(startp + centralOffset) == CENTRALSIG) {
// Success means optimized jar layout from bug 559961 is in effect
uint32_t readaheadLength = xtolong(startp);
if (readaheadLength) {
#if defined(XP_UNIX)
madvise(const_cast<uint8_t*>(startp), readaheadLength, MADV_WILLNEED);
#elif defined(XP_WIN)
if (aFd) {
HANDLE hFile = (HANDLE) PR_FileDesc2NativeHandle(aFd);
mozilla::ReadAhead(hFile, 0, readaheadLength);
}
#endif
}
} else {
for (buf = endp - ZIPEND_SIZE; buf > startp; buf--)
{
if (xtolong(buf) == ENDSIG) {
centralOffset = xtolong(((ZipEnd *)buf)->offset_central_dir);
break;
}
}
}
if (!centralOffset) {
nsZipArchive::sFileCorruptedReason = "nsZipArchive: no central offset";
return NS_ERROR_FILE_CORRUPTED;
}
buf = startp + centralOffset;
// avoid overflow of startp + centralOffset.
if (buf < startp) {
nsZipArchive::sFileCorruptedReason = "nsZipArchive: overflow looking for central directory";
return NS_ERROR_FILE_CORRUPTED;
}
//-- Read the central directory headers
uint32_t sig = 0;
while ((buf + int32_t(sizeof(uint32_t)) > buf) &&
(buf + int32_t(sizeof(uint32_t)) <= endp) &&
((sig = xtolong(buf)) == CENTRALSIG)) {
// Make sure there is enough data available.
if ((buf > endp) || (endp - buf < ZIPCENTRAL_SIZE)) {
nsZipArchive::sFileCorruptedReason = "nsZipArchive: central directory too small";
return NS_ERROR_FILE_CORRUPTED;
}
// Read the fixed-size data.
ZipCentral* central = (ZipCentral*)buf;
uint16_t namelen = xtoint(central->filename_len);
uint16_t extralen = xtoint(central->extrafield_len);
uint16_t commentlen = xtoint(central->commentfield_len);
uint32_t diff = 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 < 1 ||
namelen > kMaxNameLength) {
nsZipArchive::sFileCorruptedReason = "nsZipArchive: namelen out of range";
return NS_ERROR_FILE_CORRUPTED;
}
if (buf >= buf + diff || // No overflow
buf >= endp - diff) {
nsZipArchive::sFileCorruptedReason = "nsZipArchive: overflow looking for next item";
return NS_ERROR_FILE_CORRUPTED;
}
// Point to the next item at the top of loop
buf += diff;
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
uint32_t hash = HashName(item->Name(), namelen);
item->next = mFiles[hash];
mFiles[hash] = item;
sig = 0;
} /* while reading central directory records */
if (sig != ENDSIG) {
nsZipArchive::sFileCorruptedReason = "nsZipArchive: unexpected sig";
return NS_ERROR_FILE_CORRUPTED;
}
// Make the comment available for consumers.
if ((endp >= buf) && (endp - buf >= ZIPEND_SIZE)) {
ZipEnd *zipend = (ZipEnd *)buf;
buf += ZIPEND_SIZE;
uint16_t commentlen = xtoint(zipend->commentfield_len);
if (endp - buf >= commentlen) {
mCommentPtr = (const char *)buf;
mCommentLen = commentlen;
}
}
MOZ_WIN_MEM_TRY_CATCH(return NS_ERROR_FAILURE)
return NS_OK;
}
//---------------------------------------------
// nsZipArchive::BuildSynthetics
//---------------------------------------------
nsresult nsZipArchive::BuildSynthetics()
{
if (mBuiltSynthetics)
return NS_OK;
mBuiltSynthetics = true;
MOZ_WIN_MEM_TRY_BEGIN
// Create synthetic entries for any missing directories.
// Do this when all ziptable has scanned to prevent double entries.
for (auto* item : mFiles)
{
for (; item != nullptr; 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
uint16_t namelen = item->nameLength;
MOZ_ASSERT(namelen > 0, "Attempt to build synthetic for zero-length entry name!");
const char *name = item->Name();
for (uint16_t dirlen = namelen - 1; dirlen > 0; dirlen--)
{
if (name[dirlen-1] != '/')
continue;
// The character before this is '/', so if this is also '/' then we
// have an empty path component. Skip it.
if (name[dirlen] == '/')
continue;
// Is the directory already in the file table?
uint32_t hash = HashName(item->Name(), dirlen);
bool found = false;
for (nsZipItem* zi = mFiles[hash]; zi != nullptr; 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 = 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 */
}
}
MOZ_WIN_MEM_TRY_CATCH(return NS_ERROR_FAILURE)
return NS_OK;
}
nsZipHandle* nsZipArchive::GetFD()
{
if (!mFd)
return nullptr;
return mFd.get();
}
//---------------------------------------------
// nsZipArchive::GetDataOffset
//---------------------------------------------
uint32_t nsZipArchive::GetDataOffset(nsZipItem* aItem)
{
MOZ_ASSERT(aItem);
MOZ_WIN_MEM_TRY_BEGIN
//-- read local header to get variable length values and calculate
//-- the real data offset
uint32_t len = mFd->mLen;
const uint8_t* data = mFd->mFileData;
uint32_t offset = aItem->LocalOffset();
if (len < ZIPLOCAL_SIZE || offset > len - ZIPLOCAL_SIZE)
return 0;
// -- check signature before using the structure, in case the zip file is corrupt
ZipLocal* Local = (ZipLocal*)(data + offset);
if ((xtolong(Local->signature) != LOCALSIG))
return 0;
//-- 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);
return offset;
MOZ_WIN_MEM_TRY_CATCH(return 0)
}
//---------------------------------------------
// nsZipArchive::GetData
//---------------------------------------------
const uint8_t* nsZipArchive::GetData(nsZipItem* aItem)
{
MOZ_ASSERT(aItem);
MOZ_WIN_MEM_TRY_BEGIN
uint32_t offset = GetDataOffset(aItem);
// -- check if there is enough source data in the file
if (!offset ||
mFd->mLen < aItem->Size() ||
offset > mFd->mLen - aItem->Size() ||
(aItem->Compression() == STORED && aItem->Size() != aItem->RealSize())) {
return nullptr;
}
return mFd->mFileData + offset;
MOZ_WIN_MEM_TRY_CATCH(return nullptr)
}
// nsZipArchive::GetComment
bool nsZipArchive::GetComment(nsACString &aComment)
{
MOZ_WIN_MEM_TRY_BEGIN
aComment.Assign(mCommentPtr, mCommentLen);
MOZ_WIN_MEM_TRY_CATCH(return false)
return true;
}
//---------------------------------------------
// nsZipArchive::SizeOfMapping
//---------------------------------------------
int64_t nsZipArchive::SizeOfMapping()
{
return mFd ? mFd->SizeOfMapping() : 0;
}
//------------------------------------------
// nsZipArchive constructor and destructor
//------------------------------------------
nsZipArchive::nsZipArchive()
: mRefCnt(0)
, mCommentPtr(nullptr)
, mCommentLen(0)
, mBuiltSynthetics(false)
{
zipLog.AddRef();
// initialize the table to nullptr
memset(mFiles, 0, sizeof(mFiles));
}
NS_IMPL_ADDREF(nsZipArchive)
NS_IMPL_RELEASE(nsZipArchive)
nsZipArchive::~nsZipArchive()
{
CloseArchive();
zipLog.Release();
}
//------------------------------------------
// nsZipFind constructor and destructor
//------------------------------------------
nsZipFind::nsZipFind(nsZipArchive* aZip, char* aPattern, bool aRegExp)
: mArchive(aZip)
, mPattern(aPattern)
, mItem(nullptr)
, 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 uint32_t HashName(const char* aName, uint16_t len)
{