#include "libbb.h"
#include "bb_archive.h"
+void FAST_FUNC init_transformer_state(transformer_state_t *xstate)
+{
+ memset(xstate, 0, sizeof(*xstate));
+}
+
+int FAST_FUNC check_signature16(transformer_state_t *xstate, unsigned magic16)
+{
+ if (xstate->check_signature) {
+ 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;
+ }
+ }
+ return 0;
+}
+
+ssize_t FAST_FUNC transformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize)
+{
+ ssize_t nwrote;
+
+ if (xstate->mem_output_size_max != 0) {
+ size_t pos = xstate->mem_output_size;
+ size_t size;
+
+ size = (xstate->mem_output_size += bufsize);
+ if (size > xstate->mem_output_size_max) {
+ free(xstate->mem_output_buf);
+ xstate->mem_output_buf = NULL;
+ bb_perror_msg("buffer %u too small", (unsigned)xstate->mem_output_size_max);
+ nwrote = -1;
+ goto ret;
+ }
+ xstate->mem_output_buf = xrealloc(xstate->mem_output_buf, size + 1);
+ memcpy(xstate->mem_output_buf + pos, buf, bufsize);
+ xstate->mem_output_buf[size] = '\0';
+ nwrote = bufsize;
+ } else {
+ nwrote = full_write(xstate->dst_fd, buf, bufsize);
+ if (nwrote != (ssize_t)bufsize) {
+ bb_perror_msg("write");
+ nwrote = -1;
+ goto ret;
+ }
+ }
+ ret:
+ return nwrote;
+}
+
+ssize_t FAST_FUNC xtransformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize)
+{
+ ssize_t nwrote = transformer_write(xstate, buf, bufsize);
+ if (nwrote != (ssize_t)bufsize) {
+ xfunc_die();
+ }
+ return nwrote;
+}
+
+void check_errors_in_children(int signo)
+{
+ int status;
+
+ if (!signo) {
+ /* block waiting for any child */
+ if (wait(&status) < 0)
+//FIXME: check EINTR?
+ return; /* probably there are no children */
+ goto check_status;
+ }
+
+ /* Wait for any child without blocking */
+ for (;;) {
+ if (wait_any_nohang(&status) < 0)
+//FIXME: check EINTR?
+ /* wait failed?! I'm confused... */
+ return;
+ check_status:
+ /*if (WIFEXITED(status) && WEXITSTATUS(status) == 0)*/
+ /* On Linux, the above can be checked simply as: */
+ if (status == 0)
+ /* this child exited with 0 */
+ continue;
+ /* Cannot happen:
+ if (!WIFSIGNALED(status) && !WIFEXITED(status)) ???;
+ */
+ bb_got_signal = 1;
+ }
+}
+
/* transformer(), more than meets the eye */
-/*
- * On MMU machine, the transform_prog is removed by macro magic
- * in include/archive.h. On NOMMU, transformer is removed.
- */
-void FAST_FUNC open_transformer(int fd,
- IF_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd),
- const char *transform_prog)
+#if BB_MMU
+void FAST_FUNC fork_transformer(int fd,
+ int check_signature,
+ IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate)
+)
+#else
+void FAST_FUNC fork_transformer(int fd, const char *transform_prog)
+#endif
{
struct fd_pair fd_pipe;
int pid;
close(fd_pipe.rd); /* we don't want to read from the parent */
// FIXME: error check?
#if BB_MMU
- transformer(fd, fd_pipe.wr);
- if (ENABLE_FEATURE_CLEAN_UP) {
- close(fd_pipe.wr); /* send EOF */
- close(fd);
+ {
+ IF_DESKTOP(long long) int r;
+ transformer_state_t xstate;
+ init_transformer_state(&xstate);
+ xstate.check_signature = check_signature;
+ xstate.src_fd = fd;
+ xstate.dst_fd = fd_pipe.wr;
+ r = transformer(&xstate);
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ close(fd_pipe.wr); /* send EOF */
+ close(fd);
+ }
+ /* must be _exit! bug was actually seen here */
+ _exit(/*error if:*/ r < 0);
}
- /* must be _exit! bug was actually seen here */
- _exit(EXIT_SUCCESS);
#else
{
char *argv[4];
close(fd_pipe.wr); /* don't want to write to the child */
xmove_fd(fd_pipe.rd, fd);
}
+
+
+#if SEAMLESS_COMPRESSION
+
+/* Used by e.g. rpm which gives us a fd without filename,
+ * thus we can't guess the format from filename's extension.
+ */
+static transformer_state_t *setup_transformer_on_fd(int fd, int fail_if_not_compressed)
+{
+ union {
+ uint8_t b[4];
+ 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;
+
+ /* .gz and .bz2 both have 2-byte signature, and their
+ * unpack_XXX_stream wants this header skipped. */
+ xread(fd, magic.b16, sizeof(magic.b16[0]));
+ if (ENABLE_FEATURE_SEAMLESS_GZ
+ && magic.b16[0] == GZIP_MAGIC
+ ) {
+ xstate->xformer = unpack_gz_stream;
+ USE_FOR_NOMMU(xstate->xformer_prog = "gunzip";)
+ goto found_magic;
+ }
+ if (ENABLE_FEATURE_SEAMLESS_Z
+ && magic.b16[0] == COMPRESS_MAGIC
+ ) {
+ xstate->xformer = unpack_Z_stream;
+ USE_FOR_NOMMU(xstate->xformer_prog = "uncompress";)
+ goto found_magic;
+ }
+ if (ENABLE_FEATURE_SEAMLESS_BZ2
+ && magic.b16[0] == BZIP2_MAGIC
+ ) {
+ xstate->xformer = unpack_bz2_stream;
+ USE_FOR_NOMMU(xstate->xformer_prog = "bunzip2";)
+ goto found_magic;
+ }
+ if (ENABLE_FEATURE_SEAMLESS_XZ
+ && magic.b16[0] == XZ_MAGIC1
+ ) {
+ offset = -6;
+ xread(fd, magic.b32, sizeof(magic.b32[0]));
+ if (magic.b32[0] == XZ_MAGIC2) {
+ xstate->xformer = unpack_xz_stream;
+ USE_FOR_NOMMU(xstate->xformer_prog = "unxz";)
+ goto found_magic;
+ }
+ }
+
+ /* No known magic seen */
+ if (fail_if_not_compressed)
+ bb_error_msg_and_die("no gzip"
+ IF_FEATURE_SEAMLESS_BZ2("/bzip2")
+ IF_FEATURE_SEAMLESS_XZ("/xz")
+ " magic");
+
+ /* Some callers expect this function to "consume" fd
+ * even if data is not compressed. In this case,
+ * we return a state with trivial transformer.
+ */
+// USE_FOR_MMU(xstate->xformer = copy_stream;)
+// 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 */
+
+ return xstate;
+}
+
+/* Used by e.g. rpm which gives us a fd without filename,
+ * thus we can't guess the format from filename's extension.
+ */
+int FAST_FUNC setup_unzip_on_fd(int fd, int fail_if_not_compressed)
+{
+ transformer_state_t *xstate = setup_transformer_on_fd(fd, fail_if_not_compressed);
+
+ if (!xstate || !xstate->xformer) {
+ free(xstate);
+ return 1;
+ }
+
+# if BB_MMU
+ fork_transformer_with_no_sig(xstate->src_fd, xstate->xformer);
+# else
+ fork_transformer_with_sig(xstate->src_fd, xstate->xformer, xstate->xformer_prog);
+# endif
+ free(xstate);
+ return 0;
+}
+
+static transformer_state_t *open_transformer(const char *fname, int fail_if_not_compressed)
+{
+ transformer_state_t *xstate;
+ int fd;
+
+ fd = open(fname, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
+ if (ENABLE_FEATURE_SEAMLESS_LZMA) {
+ /* .lzma has no header/signature, can only detect it by extension */
+ char *sfx = strrchr(fname, '.');
+ if (sfx && strcmp(sfx+1, "lzma") == 0) {
+ xstate = xzalloc(sizeof(*xstate));
+ xstate->src_fd = fd;
+ xstate->xformer = unpack_lzma_stream;
+ USE_FOR_NOMMU(xstate->xformer_prog = "unlzma";)
+ return xstate;
+ }
+ }
+
+ xstate = setup_transformer_on_fd(fd, fail_if_not_compressed);
+
+ return xstate;
+}
+
+int FAST_FUNC open_zipped(const char *fname, int fail_if_not_compressed)
+{
+ int fd;
+ transformer_state_t *xstate;
+
+ xstate = open_transformer(fname, fail_if_not_compressed);
+ if (!xstate)
+ return -1;
+
+ fd = xstate->src_fd;
+ if (xstate->xformer) {
+# if BB_MMU
+ fork_transformer_with_no_sig(xstate->src_fd, xstate->xformer);
+# else
+ fork_transformer_with_sig(xstate->src_fd, xstate->xformer, xstate->xformer_prog);
+# endif
+ }
+ /* else: the file is not compressed */
+
+ free(xstate);
+ return fd;
+}
+
+void* FAST_FUNC xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_p)
+{
+# if 1
+ transformer_state_t *xstate;
+ char *image;
+
+ xstate = open_transformer(fname, /*fail_if_not_compressed:*/ 0);
+ if (!xstate) /* file open error */
+ return NULL;
+
+ image = NULL;
+ if (xstate->xformer) {
+ /* In-memory decompression */
+ xstate->mem_output_size_max = maxsz_p ? *maxsz_p : (size_t)(INT_MAX - 4095);
+ xstate->xformer(xstate);
+ if (xstate->mem_output_buf) {
+ image = xstate->mem_output_buf;
+ if (maxsz_p)
+ *maxsz_p = xstate->mem_output_size;
+ }
+ } else {
+ /* File is not compressed */
+ image = xmalloc_read(xstate->src_fd, maxsz_p);
+ }
+
+ if (!image)
+ bb_perror_msg("read error from '%s'", fname);
+ close(xstate->src_fd);
+ free(xstate);
+ return image;
+# else
+ /* This version forks a subprocess - much more expensive */
+ int fd;
+ char *image;
+
+ fd = open_zipped(fname, /*fail_if_not_compressed:*/ 0);
+ if (fd < 0)
+ return NULL;
+
+ image = xmalloc_read(fd, maxsz_p);
+ if (!image)
+ bb_perror_msg("read error from '%s'", fname);
+ close(fd);
+ return image;
+# endif
+}
+
+#endif /* SEAMLESS_COMPRESSION */
projects / oweals / busybox.git / blobdiff