diff options
Diffstat (limited to 'lib/inflate.c')
| -rw-r--r-- | lib/inflate.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/lib/inflate.c b/lib/inflate.c index 65e435bdb..3dca73c72 100644 --- a/lib/inflate.c +++ b/lib/inflate.c @@ -1,16 +1,17 @@ -#ifndef DEBG #define DEBG(x) -#endif -#ifndef DEBG1 #define DEBG1(x) -#endif - /* inflate.c -- Not copyrighted 1992 by Mark Adler version c10p1, 10 January 1993 */ /* * Adapted for booting Linux by Hannu Savolainen 1993 * based on gzip-1.0.3 + * + * Nicolas Pitre <nico@visuaide.com>, 1999/04/14 : + * Little mods for all variable to reside either into rodata or bss segments + * by marking constant variables with 'const' and initializing all the others + * at run-time only. This allows for the kernel uncompressor to run + * directly from Flash or ROM memory on embeded systems. */ /* @@ -137,8 +138,8 @@ struct huft { /* Function prototypes */ -STATIC int huft_build OF((unsigned *, unsigned, unsigned, const ush *, const ush *, - struct huft **, int *)); +STATIC int huft_build OF((unsigned *, unsigned, unsigned, + const ush *, const ush *, struct huft **, int *)); STATIC int huft_free OF((struct huft *)); STATIC int inflate_codes OF((struct huft *, struct huft *, int, int)); STATIC int inflate_stored OF((void)); @@ -1007,7 +1008,7 @@ STATIC int inflate() **********************************************************************/ static ulg crc_32_tab[256]; -static ulg crc; /* shift register contents */ +static ulg crc; /* initialized in makecrc() so it'll reside in bss */ #define CRC_VALUE (crc ^ 0xffffffffL) /* @@ -1026,7 +1027,7 @@ makecrc(void) int k; /* byte being shifted into crc apparatus */ /* terms of polynomial defining this crc (except x^32): */ - static int p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26}; + static const int p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26}; /* Make exclusive-or pattern from polynomial */ e = 0; @@ -1046,6 +1047,9 @@ makecrc(void) } crc_32_tab[i] = c; } + + /* this is initialized here so this code could reside in ROM */ + crc = (ulg)0xffffffffL; /* shift register contents */ } /* gzip flag byte */ @@ -1069,7 +1073,6 @@ static int gunzip(void) ulg orig_len = 0; /* original uncompressed length */ int res; - crc = (ulg)0xffffffffL; magic[0] = (unsigned char)get_byte(); magic[1] = (unsigned char)get_byte(); method = (unsigned char)get_byte(); |