From 59655077c5bf176f01d8d277665ebb92263704ed Mon Sep 17 00:00:00 2001
From: Denys Vlasenko
Date: Tue, 6 Mar 2012 16:23:50 +0100
Subject: preparatory cleanups for seamless uncompression improvements

unpack_gz_stream_with_info: fix buggy error check
man: fix possible accesses past the end of a string
move seamless uncompression helpers from read_printf.c to open_transformer.c

function                                             old     new   delta
show_manpage                                         153     212     +59
unpack_gz_stream_with_info                           520     539     +19

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 libbb/read_printf.c | 139 ----------------------------------------------------
 1 file changed, 139 deletions(-)

(limited to 'libbb')

diff --git a/libbb/read_printf.c b/libbb/read_printf.c
index 0bbf780..5ed6e36 100644
--- a/libbb/read_printf.c
+++ b/libbb/read_printf.c
@@ -8,16 +8,6 @@
  */
 #include "libbb.h"
 
-#define ZIPPED (ENABLE_FEATURE_SEAMLESS_LZMA \
-	|| ENABLE_FEATURE_SEAMLESS_BZ2 \
-	|| ENABLE_FEATURE_SEAMLESS_GZ \
-	/* || ENABLE_FEATURE_SEAMLESS_Z */ \
-)
-
-#if ZIPPED
-# include "bb_archive.h"
-#endif
-
 
 /* Suppose that you are a shell. You start child processes.
  * They work and eventually exit. You want to get user input.
@@ -244,132 +234,3 @@ void* FAST_FUNC xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p)
 		bb_perror_msg_and_die("can't read '%s'", filename);
 	return buf;
 }
-
-/* Used by e.g. rpm which gives us a fd without filename,
- * thus we can't guess the format from filename's extension.
- */
-#if ZIPPED
-void FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/)
-{
-	const int fail_if_not_detected = 1;
-	union {
-		uint8_t b[4];
-		uint16_t b16[2];
-		uint32_t b32[1];
-	} magic;
-	int offset = -2;
-# if BB_MMU
-	IF_DESKTOP(long long) int FAST_FUNC (*xformer)(int src_fd, int dst_fd);
-	enum { xformer_prog = 0 };
-# else
-	enum { xformer = 0 };
-	const char *xformer_prog;
-# endif
-
-	/* .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
-	) {
-# if BB_MMU
-		xformer = unpack_gz_stream;
-# else
-		xformer_prog = "gunzip";
-# endif
-		goto found_magic;
-	}
-	if (ENABLE_FEATURE_SEAMLESS_BZ2
-	 && magic.b16[0] == BZIP2_MAGIC
-	) {
-# if BB_MMU
-		xformer = unpack_bz2_stream;
-# else
-		xformer_prog = "bunzip2";
-# endif
-		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) {
-# if BB_MMU
-			xformer = unpack_xz_stream;
-			/* unpack_xz_stream wants fd at position 6, no need to seek */
-			//xlseek(fd, offset, SEEK_CUR);
-# else
-			xformer_prog = "unxz";
-# endif
-			goto found_magic;
-		}
-	}
-
-	/* No known magic seen */
-	if (fail_if_not_detected)
-		bb_error_msg_and_die("no gzip"
-			IF_FEATURE_SEAMLESS_BZ2("/bzip2")
-			IF_FEATURE_SEAMLESS_XZ("/xz")
-			" magic");
-	xlseek(fd, offset, SEEK_CUR);
-	return;
-
- found_magic:
-# if !BB_MMU
-	/* NOMMU version of open_transformer execs
-	 * an external unzipper that wants
-	 * file position at the start of the file */
-	xlseek(fd, offset, SEEK_CUR);
-# endif
-	open_transformer(fd, xformer, xformer_prog);
-}
-#endif /* ZIPPED */
-
-int FAST_FUNC open_zipped(const char *fname)
-{
-#if !ZIPPED
-	return open(fname, O_RDONLY);
-#else
-	char *sfx;
-	int fd;
-
-	fd = open(fname, O_RDONLY);
-	if (fd < 0)
-		return fd;
-
-	sfx = strrchr(fname, '.');
-	if (sfx) {
-		sfx++;
-		if (ENABLE_FEATURE_SEAMLESS_LZMA && strcmp(sfx, "lzma") == 0)
-			/* .lzma has no header/signature, just trust it */
-			open_transformer(fd, unpack_lzma_stream, "unlzma");
-		else
-		if ((ENABLE_FEATURE_SEAMLESS_GZ && strcmp(sfx, "gz") == 0)
-		 || (ENABLE_FEATURE_SEAMLESS_BZ2 && strcmp(sfx, "bz2") == 0)
-		 || (ENABLE_FEATURE_SEAMLESS_XZ && strcmp(sfx, "xz") == 0)
-		) {
-			setup_unzip_on_fd(fd /*, fail_if_not_detected: 1*/);
-		}
-	}
-
-	return fd;
-#endif
-}
-
-void* FAST_FUNC xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_p)
-{
-	int fd;
-	char *image;
-
-	fd = open_zipped(fname);
-	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;
-}
-- 
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