/*
* Uncompress an entry, in its entirety, to an open file descriptor.
*
* TODO: this doesn't verify the data's CRC, but probably should (especially
* for uncompressed data).
*/
bool dexZipExtractEntryToFile(const ZipArchive* pArchive,
const ZipEntry entry, int fd)
{
bool result = false;
int ent = entryToIndex(pArchive, entry);
if (ent < 0)
return -1;
const unsigned char* basePtr = (const unsigned char*)pArchive->mMap.addr;
int method;
long uncompLen, compLen;
off_t offset;
if (!dexZipGetEntryInfo(pArchive, entry, &method, &uncompLen, &compLen,
&offset, NULL, NULL))
{
goto bail;
}
if (method == kCompressStored) {
ssize_t actual;
actual = write(fd, basePtr + offset, uncompLen);
if (actual < 0) {
LOGE("Write failed: %s\n", strerror(errno));
goto bail;
} else if (actual != uncompLen) {
LOGE("Partial write during uncompress (%d of %ld)\n",
(int) actual, uncompLen);
goto bail;
} else {
LOGI("+++ successful write\n");
}
} else {
if (!inflateToFile(fd, basePtr+offset, uncompLen, compLen))
goto bail;
}
result = true;
bail:
return result;
}
/*
* Uncompress an entry, in its entirety, to an open file descriptor.
*
* TODO: this doesn't verify the data's CRC, but probably should (especially
* for uncompressed data).
*/
int dexZipExtractEntryToFile(const ZipArchive* pArchive,
const ZipEntry entry, int fd)
{
int result = -1;
int ent = entryToIndex(pArchive, entry);
if (ent < 0) {
LOGW("Zip: extract can't find entry %p\n", entry);
goto bail;
}
int method;
size_t uncompLen, compLen;
off_t dataOffset;
if (dexZipGetEntryInfo(pArchive, entry, &method, &uncompLen, &compLen,
&dataOffset, NULL, NULL) != 0)
{
goto bail;
}
if (lseek(pArchive->mFd, dataOffset, SEEK_SET) != dataOffset) {
LOGW("Zip: lseek to data at %ld failed\n", (long) dataOffset);
goto bail;
}
if (method == kCompressStored) {
if (copyFileToFile(pArchive->mFd, fd, uncompLen) != 0)
goto bail;
} else {
if (inflateToFile(pArchive->mFd, fd, uncompLen, compLen) != 0)
goto bail;
}
result = 0;
bail:
return result;
}
// this is used by the drag-and-drop reordering
void CWList::moveItem(CWListEntry * pEntry, int iNewLoc)
{
int iCurrentLoc = entryToIndex(pEntry);
m_pEntries.RemoveAt(iCurrentLoc);
m_pEntries.InsertAt(iNewLoc, pEntry);
}
/*
* Get the useful fields from the zip entry.
*
* Returns non-zero if the contents of the fields (particularly the data
* offset) appear to be bogus.
*/
int dexZipGetEntryInfo(const ZipArchive* pArchive, ZipEntry entry,
int* pMethod, size_t* pUncompLen, size_t* pCompLen, off_t* pOffset,
long* pModWhen, long* pCrc32)
{
int ent = entryToIndex(pArchive, entry);
if (ent < 0)
return -1;
/*
* Recover the start of the central directory entry from the filename
* pointer. The filename is the first entry past the fixed-size data,
* so we can just subtract back from that.
*/
const unsigned char* basePtr = (const unsigned char*)
pArchive->mDirectoryMap.addr;
const unsigned char* ptr = (const unsigned char*)
pArchive->mHashTable[ent].name;
off_t cdOffset = pArchive->mDirectoryOffset;
ptr -= kCDELen;
int method = get2LE(ptr + kCDEMethod);
if (pMethod != NULL)
*pMethod = method;
if (pModWhen != NULL)
*pModWhen = get4LE(ptr + kCDEModWhen);
if (pCrc32 != NULL)
*pCrc32 = get4LE(ptr + kCDECRC);
size_t compLen = get4LE(ptr + kCDECompLen);
if (pCompLen != NULL)
*pCompLen = compLen;
size_t uncompLen = get4LE(ptr + kCDEUncompLen);
if (pUncompLen != NULL)
*pUncompLen = uncompLen;
/*
* If requested, determine the offset of the start of the data. All we
* have is the offset to the Local File Header, which is variable size,
* so we have to read the contents of the struct to figure out where
* the actual data starts.
*
* We also need to make sure that the lengths are not so large that
* somebody trying to map the compressed or uncompressed data runs
* off the end of the mapped region.
*
* Note we don't verify compLen/uncompLen if they don't request the
* dataOffset, because dataOffset is expensive to determine. However,
* if they don't have the file offset, they're not likely to be doing
* anything with the contents.
*/
if (pOffset != NULL) {
long localHdrOffset = (long) get4LE(ptr + kCDELocalOffset);
if (localHdrOffset + kLFHLen >= cdOffset) {
LOGW("Zip: bad local hdr offset in zip\n");
return -1;
}
u1 lfhBuf[kLFHLen];
if (lseek(pArchive->mFd, localHdrOffset, SEEK_SET) != localHdrOffset) {
LOGW("Zip: failed seeking to lfh at offset %ld\n", localHdrOffset);
return -1;
}
ssize_t actual =
TEMP_FAILURE_RETRY(read(pArchive->mFd, lfhBuf, sizeof(lfhBuf)));
if (actual != sizeof(lfhBuf)) {
LOGW("Zip: failed reading lfh from offset %ld\n", localHdrOffset);
return -1;
}
if (get4LE(lfhBuf) != kLFHSignature) {
LOGW("Zip: didn't find signature at start of lfh, offset=%ld\n",
localHdrOffset);
return -1;
}
off_t dataOffset = localHdrOffset + kLFHLen
+ get2LE(lfhBuf + kLFHNameLen) + get2LE(lfhBuf + kLFHExtraLen);
if (dataOffset >= cdOffset) {
LOGW("Zip: bad data offset %ld in zip\n", (long) dataOffset);
return -1;
}
/* check lengths */
if ((off_t)(dataOffset + compLen) > cdOffset) {
LOGW("Zip: bad compressed length in zip (%ld + %zd > %ld)\n",
(long) dataOffset, compLen, (long) cdOffset);
return -1;
}
if (method == kCompressStored &&
(off_t)(dataOffset + uncompLen) > cdOffset)
{
LOGW("Zip: bad uncompressed length in zip (%ld + %zd > %ld)\n",
(long) dataOffset, uncompLen, (long) cdOffset);
return -1;
}
*pOffset = dataOffset;
}
return 0;
}
/*
* Get the useful fields from the zip entry.
*
* Returns "false" if the offsets to the fields or the contents of the fields
* appear to be bogus.
*/
bool dexZipGetEntryInfo(const ZipArchive* pArchive, ZipEntry entry,
int* pMethod, long* pUncompLen, long* pCompLen, off_t* pOffset,
long* pModWhen, long* pCrc32)
{
int ent = entryToIndex(pArchive, entry);
if (ent < 0)
return false;
/*
* Recover the start of the central directory entry from the filename
* pointer.
*/
const unsigned char* basePtr = (const unsigned char*)
pArchive->mMap.addr;
const unsigned char* ptr = (const unsigned char*)
pArchive->mHashTable[ent].name;
size_t zipLength =
pArchive->mMap.length;
ptr -= kCDELen;
int method = get2LE(ptr + kCDEMethod);
if (pMethod != NULL)
*pMethod = method;
if (pModWhen != NULL)
*pModWhen = get4LE(ptr + kCDEModWhen);
if (pCrc32 != NULL)
*pCrc32 = get4LE(ptr + kCDECRC);
/*
* We need to make sure that the lengths are not so large that somebody
* trying to map the compressed or uncompressed data runs off the end
* of the mapped region.
*/
unsigned long localHdrOffset = get4LE(ptr + kCDELocalOffset);
if (localHdrOffset + kLFHLen >= zipLength) {
LOGE("ERROR: bad local hdr offset in zip\n");
return false;
}
const unsigned char* localHdr = basePtr + localHdrOffset;
off_t dataOffset = localHdrOffset + kLFHLen
+ get2LE(localHdr + kLFHNameLen) + get2LE(localHdr + kLFHExtraLen);
if ((unsigned long) dataOffset >= zipLength) {
LOGE("ERROR: bad data offset in zip\n");
return false;
}
if (pCompLen != NULL) {
*pCompLen = get4LE(ptr + kCDECompLen);
if (*pCompLen < 0 || (size_t)(dataOffset + *pCompLen) >= zipLength) {
LOGE("ERROR: bad compressed length in zip\n");
return false;
}
}
if (pUncompLen != NULL) {
*pUncompLen = get4LE(ptr + kCDEUncompLen);
if (*pUncompLen < 0) {
LOGE("ERROR: negative uncompressed length in zip\n");
return false;
}
if (method == kCompressStored &&
(size_t)(dataOffset + *pUncompLen) >= zipLength)
{
LOGE("ERROR: bad uncompressed length in zip\n");
return false;
}
}
if (pOffset != NULL) {
*pOffset = dataOffset;
}
return true;
}
