libarchive: fix xmalloc_open_zipped_read_close() on NOMMU
The somewhat new "unpack in memory" code was broken
for xmalloc_open_zipped_read_close() on NOMMU: we seek back
over signature, but then expect it to be already consumed.
Stop seeking back in this case.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/libarchive/decompress_gunzip.c b/archival/libarchive/decompress_gunzip.c
index 20e4d9a..c7fa5b5 100644
--- a/archival/libarchive/decompress_gunzip.c
+++ b/archival/libarchive/decompress_gunzip.c
@@ -1201,7 +1201,7 @@
if (check_signature16(xstate, GZIP_MAGIC))
return -1;
#else
- if (xstate->check_signature) {
+ if (!xstate->signature_skipped) {
uint16_t magic2;
if (full_read(xstate->src_fd, &magic2, 2) != 2) {
@@ -1210,7 +1210,7 @@
return -1;
}
if (magic2 == COMPRESS_MAGIC) {
- xstate->check_signature = 0;
+ xstate->signature_skipped = 2;
return unpack_Z_stream(xstate);
}
if (magic2 != GZIP_MAGIC)
diff --git a/archival/libarchive/decompress_unxz.c b/archival/libarchive/decompress_unxz.c
index 1f408ab..cd32cc7 100644
--- a/archival/libarchive/decompress_unxz.c
+++ b/archival/libarchive/decompress_unxz.c
@@ -55,7 +55,7 @@
iobuf.out = membuf + BUFSIZ;
iobuf.out_size = BUFSIZ;
- if (!xstate || xstate->check_signature == 0) {
+ if (!xstate || xstate->signature_skipped) {
/* Preload XZ file signature */
strcpy((char*)membuf, HEADER_MAGIC);
iobuf.in_size = HEADER_MAGIC_SIZE;
diff --git a/archival/libarchive/open_transformer.c b/archival/libarchive/open_transformer.c
index be536a3..d93c836 100644
--- a/archival/libarchive/open_transformer.c
+++ b/archival/libarchive/open_transformer.c
@@ -13,16 +13,13 @@
int FAST_FUNC check_signature16(transformer_state_t *xstate, unsigned magic16)
{
- if (xstate->check_signature) {
+ if (!xstate->signature_skipped) {
uint16_t magic2;
if (full_read(xstate->src_fd, &magic2, 2) != 2 || magic2 != magic16) {
bb_error_msg("invalid magic");
-#if 0 /* possible future extension */
- if (xstate->check_signature > 1)
- xfunc_die();
-#endif
return -1;
}
+ xstate->signature_skipped = 2;
}
return 0;
}
@@ -102,7 +99,7 @@
/* transformer(), more than meets the eye */
#if BB_MMU
void FAST_FUNC fork_transformer(int fd,
- int check_signature,
+ int signature_skipped,
IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate)
)
#else
@@ -123,7 +120,7 @@
IF_DESKTOP(long long) int r;
transformer_state_t xstate;
init_transformer_state(&xstate);
- xstate.check_signature = check_signature;
+ xstate.signature_skipped = signature_skipped;
xstate.src_fd = fd;
xstate.dst_fd = fd_pipe.wr;
r = transformer(&xstate);
@@ -168,12 +165,11 @@
uint16_t b16[2];
uint32_t b32[1];
} magic;
- int offset;
transformer_state_t *xstate;
- offset = -2;
xstate = xzalloc(sizeof(*xstate));
xstate->src_fd = fd;
+ xstate->signature_skipped = 2;
/* .gz and .bz2 both have 2-byte signature, and their
* unpack_XXX_stream wants this header skipped. */
@@ -202,7 +198,7 @@
if (ENABLE_FEATURE_SEAMLESS_XZ
&& magic.b16[0] == XZ_MAGIC1
) {
- offset = -6;
+ xstate->signature_skipped = 6;
xread(fd, magic.b32, sizeof(magic.b32[0]));
if (magic.b32[0] == XZ_MAGIC2) {
xstate->xformer = unpack_xz_stream;
@@ -226,16 +222,7 @@
// USE_FOR_NOMMU(xstate->xformer_prog = "cat";)
/* fall through to seeking bck over bytes we read earlier */
- USE_FOR_NOMMU(found_magic:)
- /* NOMMU version of fork_transformer execs
- * an external unzipper that wants
- * file position at the start of the file.
- */
- xlseek(fd, offset, SEEK_CUR);
-
- USE_FOR_MMU(found_magic:)
- /* In MMU case, if magic was found, seeking back is not necessary */
-
+ found_magic:
return xstate;
}
@@ -254,6 +241,12 @@
# if BB_MMU
fork_transformer_with_no_sig(xstate->src_fd, xstate->xformer);
# else
+ /* NOMMU version of fork_transformer execs
+ * an external unzipper that wants
+ * file position at the start of the file.
+ */
+ xlseek(fd, - xstate->signature_skipped, SEEK_CUR);
+ xstate->signature_skipped = 0;
fork_transformer_with_sig(xstate->src_fd, xstate->xformer, xstate->xformer_prog);
# endif
free(xstate);
@@ -300,6 +293,8 @@
# if BB_MMU
fork_transformer_with_no_sig(xstate->src_fd, xstate->xformer);
# else
+ xlseek(fd, - xstate->signature_skipped, SEEK_CUR);
+ xstate->signature_skipped = 0;
fork_transformer_with_sig(xstate->src_fd, xstate->xformer, xstate->xformer_prog);
# endif
}