- strip 399424 off the bss by making decompress_uncompress buffers config buffers.

  Compile tested (too lazy to look for a small .Z on the net).
$ size busybox.old busybox
   text    data     bss     dec     hex filename
 859555   10232  645732 1515519  171fff busybox.old
 859683   10232  246308 1116223  11083f busybox
$ make bloatcheck
function                                             old     new   delta
uncompress                                          1036    1160    +124
inbuf                                               2116       4   -2112
outbuf                                              4100       4   -4096
htab                                              131072       - -131072
codetab                                           262144       - -262144
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 1/2 up/down: 124/-399424)   Total: -399300 bytes

1 files changed, 10 insertions, 12 deletions

diff --git a/archival/libunarchive/decompress_uncompress.c b/archival/libunarchive/decompress_uncompress.c
index 0c4ab6d..e294143 100644
--- a/archival/libunarchive/decompress_uncompress.c
+++ b/archival/libunarchive/decompress_uncompress.c
@@ -70,22 +70,12 @@ static int block_mode = BLOCK_MODE;
 /* user settable max # bits/code */
 static int maxbits = BITS;
 
-/* Input buffer */
-static unsigned char inbuf[IBUFSIZ + 64];
-
-/* Output buffer */
-static unsigned char outbuf[OBUFSIZ + 2048];
-
-
-static unsigned char htab[HSIZE];
-static unsigned short codetab[HSIZE];
-
 #define	htabof(i)				htab[i]
 #define	codetabof(i)			codetab[i]
 #define	tab_prefixof(i)			codetabof(i)
 #define	tab_suffixof(i)			((unsigned char *)(htab))[i]
 #define	de_stack				((unsigned char *)&(htab[HSIZE-1]))
-#define	clear_htab()			memset(htab, -1, sizeof(htab))
+#define	clear_htab()			memset(htab, -1, HSIZE)
 #define	clear_tab_prefixof()	memset(codetab, 0, 256);
 
 
@@ -113,6 +103,12 @@ int uncompress(int fd_in, int fd_out)
 	long int maxmaxcode;
 	int n_bits;
 	int rsize = 0;
+	RESERVE_CONFIG_UBUFFER(inbuf, IBUFSIZ + 64);
+	RESERVE_CONFIG_UBUFFER(outbuf, OBUFSIZ + 2048);
+	unsigned char htab[HSIZE];
+	unsigned short codetab[HSIZE];
+	memset(inbuf, 0, IBUFSIZ + 64);
+	memset(outbuf, 0, OBUFSIZ + 2048);
 
 	insize = 0;
 
@@ -160,7 +156,7 @@ int uncompress(int fd_in, int fd_out)
 			posbits = 0;
 		}
 
-		if (insize < (int) sizeof(inbuf) - IBUFSIZ) {
+		if (insize < (int) (IBUFSIZ + 64) - IBUFSIZ) {
 			rsize = safe_read(fd_in, inbuf + insize, IBUFSIZ);
 			insize += rsize;
 		}
@@ -286,5 +282,7 @@ int uncompress(int fd_in, int fd_out)
 		write(fd_out, outbuf, outpos);
 	}
 
+	RELEASE_CONFIG_BUFFER(inbuf);
+	RELEASE_CONFIG_BUFFER(outbuf);
 	return 0;
 }