/*
* Copy the given number of bytes from one fd to another, first
* seeking the source fd to the start of the file.
*/
static int copyFileToFile(int destFd, int srcFd, size_t size)
{
if (lseek(srcFd, 0, SEEK_SET) != 0) {
ALOGE("lseek failure: %s", strerror(errno));
return -1;
}
return sysCopyFileToFile(destFd, srcFd, size);
}
/*
* 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", 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", (long) dataOffset);
goto bail;
}
if (method == kCompressStored) {
if (sysCopyFileToFile(fd, pArchive->mFd, uncompLen) != 0)
goto bail;
} else {
if (inflateToFile(fd, pArchive->mFd, uncompLen, compLen) != 0)
goto bail;
}
result = 0;
bail:
return result;
}
