[PATCH 2/20] inflate: kill legacy bits
From: Matt Mackall
Date: Mon Oct 31 2005 - 16:08:10 EST
inflate: kill legacy bits
Kill RCSID
Kill old includes and defines
Kill screwy types
Kill unused memory usage tracking
Kill 'register' usage
Kill unused tracing calls
Signed-off-by: Matt Mackall <mpm@xxxxxxxxxxx>
Index: tiny/lib/inflate.c
===================================================================
--- tiny.orig/lib/inflate.c 2005-09-28 18:19:05.000000000 -0700
+++ tiny/lib/inflate.c 2005-09-28 18:25:25.000000000 -0700
@@ -103,26 +103,11 @@
*/
#include <linux/compiler.h>
-#ifdef RCSID
-static char rcsid[] = "#Id: inflate.c,v 0.14 1993/06/10 13:27:04 jloup Exp #";
-#endif
-
-#ifndef STATIC
-
-#if defined(STDC_HEADERS) || defined(HAVE_STDLIB_H)
-# include <sys/types.h>
-# include <stdlib.h>
-#endif
-
-#include "gzip.h"
-#define STATIC
-#endif /* !STATIC */
-
#ifndef INIT
#define INIT
#endif
-#define slide window
+#include <asm/types.h>
/* Huffman code lookup table entry--this entry is four bytes for machines
that have 16-bit pointers (e.g. PC's in the small or medium model).
@@ -132,36 +117,35 @@ static char rcsid[] = "#Id: inflate.c,v
an unused code. If a code with e == 99 is looked up, this implies an
error in the data. */
struct huft {
- uch e; /* number of extra bits or operation */
- uch b; /* number of bits in this code or subcode */
+ u8 e; /* number of extra bits or operation */
+ u8 b; /* number of bits in this code or subcode */
union {
- ush n; /* literal, length base, or distance base */
+ u16 n; /* literal, length base, or distance base */
struct huft *t; /* pointer to next level of table */
} v;
};
/* Function prototypes */
-STATIC int INIT huft_build OF((unsigned *, unsigned, unsigned,
- const ush *, const ush *, struct huft **, int *));
-STATIC int INIT huft_free OF((struct huft *));
-STATIC int INIT inflate_codes OF((struct huft *, struct huft *, int, int));
-STATIC int INIT inflate_stored OF((void));
-STATIC int INIT inflate_fixed OF((void));
-STATIC int INIT inflate_dynamic OF((void));
-STATIC int INIT inflate_block OF((int *));
-STATIC int INIT inflate OF((void));
+static int INIT huft_build(unsigned *, unsigned, unsigned,
+ const u16 *, const u16 *, struct huft **, int *);
+static int INIT huft_free(struct huft *);
+static int INIT inflate_codes(struct huft *, struct huft *, int, int);
+static int INIT inflate_stored(void);
+static int INIT inflate_fixed(void);
+static int INIT inflate_dynamic(void);
+static int INIT inflate_block(int *);
+static int INIT inflate(void);
/* The inflate algorithm uses a sliding 32 K byte window on the uncompressed
stream to find repeated byte strings. This is implemented here as a
circular buffer. The index is updated simply by incrementing and then
ANDing with 0x7fff (32K-1). */
/* It is left to other modules to supply the 32 K area. It is assumed
- to be usable as if it were declared "uch slide[32768];" or as just
- "uch *slide;" and then malloc'ed in the latter case. The definition
+ to be usable as if it were declared "u8 window[32768];" or as just
+ "u8 *window;" and then malloc'ed in the latter case. The definition
must be in unzip.h, included above. */
-/* unsigned wp; current position in slide */
-#define wp outcnt
-#define flush_output(w) (wp=(w),flush_window())
+
+#define flush_output(w) (outcnt=(w),flush_window())
/* Tables for deflate from PKZIP's appnote.txt. */
@@ -171,7 +155,7 @@ static const unsigned border[] = {
};
/* Copy lengths for literal codes 257..285 */
-static const ush cplens[] = {
+static const u16 cplens[] = {
3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
};
@@ -180,20 +164,20 @@ static const ush cplens[] = {
* note: see note #13 above about the 258 in this list.
* 99==invalid
*/
-static const ush cplext[] = {
+static const u16 cplext[] = {
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99
};
/* Copy offsets for distance codes 0..29 */
-static const ush cpdist[] = {
+static const u16 cpdist[] = {
1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
8193, 12289, 16385, 24577
};
/* Extra bits for distance codes */
-static const ush cpdext[] = {
+static const u16 cpdext[] = {
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
12, 12, 13, 13
@@ -207,10 +191,10 @@ static const ush cpdext[] = {
DUMPBITS(j)
where NEEDBITS makes sure that b has at least j bits in it, and
- DUMPBITS removes the bits from b. The macros use the variable k
- for the number of bits in b. Normally, b and k are register
- variables for speed, and are initialized at the beginning of a
- routine that uses these macros from a global bit buffer and count.
+ DUMPBITS removes the bits from b. The macros use the variable k for
+ the number of bits in b. Normally, b and k are initialized at the
+ beginning of a routine that uses these macros from a global bit
+ buffer and count.
If we assume that EOB will be the longest code, then we will never
ask for bits with NEEDBITS that are beyond the end of the stream.
@@ -229,17 +213,17 @@ static const ush cpdext[] = {
the stream.
*/
-STATIC ulg bb; /* bit buffer */
-STATIC unsigned bk; /* bits in bit buffer */
+static u32 bb; /* bit buffer */
+static unsigned bk; /* bits in bit buffer */
-STATIC const ush mask_bits[] = {
+static const u16 mask_bits[] = {
0x0000,
0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
};
-#define NEXTBYTE() ({ int v = get_byte(); if (v < 0) goto underrun; (uch)v; })
-#define NEEDBITS(n) do {while(k<(n)){b|=((ulg)NEXTBYTE())<<k;k+=8;}} while(0)
+#define NEXTBYTE() ({ int v = get_byte(); if (v < 0) goto underrun; (u8)v; })
+#define NEEDBITS(n) do {while(k<(n)){b|=((u32)NEXTBYTE())<<k;k+=8;}} while(0)
#define DUMPBITS(n) do {b>>=(n);k-=(n);} while(0)
/*
@@ -274,15 +258,13 @@ STATIC const ush mask_bits[] = {
possibly even between compilers. Your mileage may vary.
*/
-STATIC const int lbits = 9; /* bits in base literal/length lookup table */
-STATIC const int dbits = 6; /* bits in base distance lookup table */
+static const int lbits = 9; /* bits in base literal/length lookup table */
+static const int dbits = 6; /* bits in base distance lookup table */
-/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
+/* If BMAX needs to be larger than 16, then h and x[] should be u32. */
#define BMAX 16 /* maximum bit length of any code (16 for explode) */
#define N_MAX 288 /* maximum number of codes in any set */
-STATIC unsigned hufts; /* track memory usage */
-
/*
* huft-build - build a huffman decoding table
* @b: code lengths in bits (all assumed <= BMAX)
@@ -300,24 +282,24 @@ STATIC unsigned hufts; /* track memory
* an oversubscribed set of lengths), and three if not enough
* memory.
*/
-STATIC int INIT huft_build(unsigned *b, unsigned n, unsigned s, const ush * d,
- const ush * e, struct huft **t, int *m)
+static int INIT huft_build(unsigned *b, unsigned n, unsigned s, const u16 * d,
+ const u16 * e, struct huft **t, int *m)
{
unsigned a; /* counter for codes of length k */
unsigned c[BMAX + 1]; /* bit length count table */
unsigned f; /* i repeats in table every f entries */
int g; /* maximum code length */
int h; /* table level */
- register unsigned i; /* counter, current code */
- register unsigned j; /* counter */
- register int k; /* number of bits in current code */
+ unsigned i; /* counter, current code */
+ unsigned j; /* counter */
+ int k; /* number of bits in current code */
int l; /* bits per table (returned in m) */
- register unsigned *p; /* pointer into c[], b[], or v[] */
- register struct huft *q; /* points to current table */
+ unsigned *p; /* pointer into c[], b[], or v[] */
+ struct huft *q; /* points to current table */
struct huft r; /* table entry for structure assignment */
struct huft *u[BMAX]; /* table stack */
unsigned v[N_MAX]; /* values in order of bit length */
- register int w; /* bits before this table == (l * h) */
+ int w; /* bits before this table == (l * h) */
unsigned x[BMAX + 1]; /* bit offsets, then code stack */
unsigned *xp; /* pointer into x */
int y; /* number of dummy codes added */
@@ -330,14 +312,12 @@ STATIC int INIT huft_build(unsigned *b,
p = b;
i = n;
do {
- Tracecv(*p, (stderr, (n - i >= ' ' && n - i <= '~' ?
- "%c %d\n" : "0x%x %d\n"), n - i, *p));
c[*p]++; /* assume all entries <= BMAX */
p++;
} while (--i);
if (c[0] == n) { /* null input--all zero length codes */
- *t = (struct huft *)NULL;
+ *t = 0;
*m = 0;
return 2;
}
@@ -389,7 +369,7 @@ STATIC int INIT huft_build(unsigned *b,
p = b;
i = 0;
do {
- if ((j = *p++) != 0)
+ if ((j = *p++))
v[x[j]++] = i;
} while (++i < n);
@@ -402,8 +382,8 @@ STATIC int INIT huft_build(unsigned *b,
p = v; /* grab values in bit order */
h = -1; /* no tables yet--level -1 */
w = -l; /* bits decoded == (l * h) */
- u[0] = (struct huft *)NULL; /* just to keep compilers happy */
- q = (struct huft *)NULL; /* ditto */
+ u[0] = NULL; /* just to keep compilers happy */
+ q = NULL; /* ditto */
z = 0; /* ditto */
DEBG("h6a ");
@@ -448,17 +428,15 @@ STATIC int INIT huft_build(unsigned *b,
z = 1 << j;
/* allocate and link in new table */
- if ((q = (struct huft *)malloc(
- (z + 1) * sizeof(struct huft)))
- == (struct huft *)NULL) {
+ if (!(q = (struct huft *)malloc(
+ (z + 1) * sizeof(struct huft)))) {
if (h)
huft_free(u[0]);
return 3; /* not enough memory */
}
DEBG1("4 ");
- hufts += z + 1; /* track memory usage */
*t = q + 1; /* link to list for huft_free */
- *(t = &(q->v.t)) = (struct huft *)NULL;
+ *(t = &(q->v.t)) = 0;
u[h] = ++q; /* table starts after link */
DEBG1("5 ");
@@ -467,9 +445,9 @@ STATIC int INIT huft_build(unsigned *b,
/* save pattern for backing up */
x[h] = i;
/* bits to dump before this table */
- r.b = (uch)l;
+ r.b = (u8)l;
/* bits in this table */
- r.e = (uch)(16 + j);
+ r.e = (u8)(16 + j);
/* pointer to this table */
r.v.t = q;
/* (get around Turbo C bug) */
@@ -482,19 +460,19 @@ STATIC int INIT huft_build(unsigned *b,
DEBG("h6c ");
/* set up table entry in r */
- r.b = (uch) (k - w);
+ r.b = (u8) (k - w);
if (p >= v + n)
r.e = 99; /* out of values--invalid code */
else if (*p < s) {
/* 256 is end-of-block code */
- r.e = (uch) (*p < 256 ? 16 : 15);
+ r.e = (u8)(*p < 256 ? 16 : 15);
/* simple code is just the value */
- r.v.n = (ush) (*p);
+ r.v.n = (u16)(*p);
/* one compiler does not like *p++ */
p++;
} else {
/* non-simple--look up in lists */
- r.e = (uch)e[*p - s];
+ r.e = (u8)e[*p - s];
r.v.n = d[*p++ - s];
}
DEBG("h6d ");
@@ -522,7 +500,7 @@ STATIC int INIT huft_build(unsigned *b,
DEBG("huft7 ");
/* Return true (1) if we were given an incomplete table */
- return y != 0 && g != 1;
+ return y && g != 1;
}
/*
@@ -535,11 +513,11 @@ STATIC int INIT huft_build(unsigned *b,
*/
STATIC int INIT huft_free(struct huft *t)
{
- register struct huft *p, *q;
+ struct huft *p, *q;
/* Go through list, freeing from the malloced (t[-1]) address. */
p = t;
- while (p != (struct huft *)NULL) {
+ while (p) {
q = (--p)->v.t;
free((char *)p);
p = q;
@@ -557,20 +535,20 @@ STATIC int INIT huft_free(struct huft *t
* inflate (decompress) the codes in a deflated (compressed) block.
* Return an error code or zero if it all goes ok.
*/
-STATIC int inflate_codes(struct huft *tl, struct huft *td, int bl, int bd)
+static int inflate_codes(struct huft *tl, struct huft *td, int bl, int bd)
{
- register unsigned e; /* table entry flag/number of extra bits */
+ unsigned e; /* table entry flag/number of extra bits */
unsigned n, d; /* length and index for copy */
unsigned w; /* current window position */
struct huft *t; /* pointer to table entry */
unsigned ml, md; /* masks for bl and bd bits */
- register ulg b; /* bit buffer */
- register unsigned k; /* number of bits in bit buffer */
+ u32 b; /* bit buffer */
+ unsigned k; /* number of bits in bit buffer */
/* make local copies of globals */
b = bb; /* initialize bit buffer */
k = bk;
- w = wp; /* initialize window position */
+ w = outcnt; /* initialize window position */
/* inflate the coded data */
ml = mask_bits[bl]; /* precompute masks for speed */
@@ -588,8 +566,7 @@ STATIC int inflate_codes(struct huft *tl
mask_bits[e]))->e) > 16);
DUMPBITS(t->b);
if (e == 16) { /* then it's a literal */
- slide[w++] = (uch)t->v.n;
- Tracevv((stderr, "%c", slide[w - 1]));
+ window[w++] = (u8)t->v.n;
if (w == WSIZE) {
flush_output(w);
w = 0;
@@ -619,7 +596,6 @@ STATIC int inflate_codes(struct huft *tl
NEEDBITS(e);
d = w - t->v.n - ((unsigned)b & mask_bits[e]);
DUMPBITS(e)
- Tracevv((stderr, "\\[%d,%d]", w - d, n));
/* do the copy */
do {
@@ -628,16 +604,14 @@ STATIC int inflate_codes(struct huft *tl
#if !defined(NOMEMCPY) && !defined(DEBUG)
/* (this test assumes unsigned comparison) */
if (w - d >= e) {
- memcpy(slide + w, slide + d, e);
+ memcpy(window + w, window + d, e);
w += e;
d += e;
} else
#endif /* !NOMEMCPY */
/* avoid memcpy() overlap */
do {
- slide[w++] = slide[d++];
- Tracevv((stderr, "%c",
- slide[w - 1]));
+ window[w++] = window[d++];
} while (--e);
if (w == WSIZE) {
flush_output(w);
@@ -648,7 +622,7 @@ STATIC int inflate_codes(struct huft *tl
}
/* restore the globals from the locals */
- wp = w; /* restore global window pointer */
+ outcnt = w; /* restore global window pointer */
bb = b; /* restore global bit buffer */
bk = k;
@@ -660,19 +634,19 @@ STATIC int inflate_codes(struct huft *tl
}
/* inflate_stored - "decompress" an inflated type 0 (stored) block. */
-STATIC int INIT inflate_stored(void)
+static int INIT inflate_stored(void)
{
unsigned n; /* number of bytes in block */
unsigned w; /* current window position */
- register ulg b; /* bit buffer */
- register unsigned k; /* number of bits in bit buffer */
+ u32 b; /* bit buffer */
+ unsigned k; /* number of bits in bit buffer */
DEBG("<stor");
/* make local copies of globals */
b = bb; /* initialize bit buffer */
k = bk;
- w = wp; /* initialize window position */
+ w = outcnt; /* initialize window position */
/* go to byte boundary */
n = k & 7;
@@ -690,7 +664,7 @@ STATIC int INIT inflate_stored(void)
/* read and output the compressed data */
while (n--) {
NEEDBITS(8);
- slide[w++] = (uch)b;
+ window[w++] = (u8)b;
if (w == WSIZE) {
flush_output(w);
w = 0;
@@ -699,7 +673,7 @@ STATIC int INIT inflate_stored(void)
}
/* restore the globals from the locals */
- wp = w; /* restore global window pointer */
+ outcnt = w; /* restore global window pointer */
bb = b; /* restore global bit buffer */
bk = k;
@@ -719,14 +693,14 @@ STATIC int INIT inflate_stored(void)
*
* We use `noinline' here to prevent gcc-3.5 from using too much stack space
*/
-STATIC int noinline INIT inflate_fixed(void)
+static int noinline INIT inflate_fixed(void)
{
int i; /* temporary variable */
struct huft *tl; /* literal/length code table */
struct huft *td; /* distance code table */
int bl; /* lookup bits for tl */
int bd; /* lookup bits for td */
- unsigned l[288]; /* length list for huft_build */
+ unsigned l[N_MAX]; /* length list for huft_build */
DEBG("<fix");
@@ -737,10 +711,10 @@ STATIC int noinline INIT inflate_fixed(v
l[i] = 9;
for (; i < 280; i++)
l[i] = 7;
- for (; i < 288; i++) /* make a complete, but wrong code set */
+ for (; i < N_MAX; i++) /* make a complete, but wrong code set */
l[i] = 8;
bl = 7;
- if ((i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl)) != 0)
+ if ((i = huft_build(l, N_MAX, 257, cplens, cplext, &tl, &bl)))
return i;
/* set up distance table */
@@ -769,7 +743,7 @@ STATIC int noinline INIT inflate_fixed(v
*
* We use `noinline' here to prevent gcc-3.5 from using too much stack space
*/
-STATIC int noinline INIT inflate_dynamic(void)
+static int noinline INIT inflate_dynamic(void)
{
int i; /* temporary variables */
unsigned j;
@@ -783,13 +757,9 @@ STATIC int noinline INIT inflate_dynamic
unsigned nb; /* number of bit length codes */
unsigned nl; /* number of literal/length codes */
unsigned nd; /* number of distance codes */
-#ifdef PKZIP_BUG_WORKAROUND
- unsigned ll[288 + 32]; /* literal/length and distance code lengths */
-#else
unsigned ll[286 + 30]; /* literal/length and distance code lengths */
-#endif
- register ulg b; /* bit buffer */
- register unsigned k; /* number of bits in bit buffer */
+ u32 b; /* bit buffer */
+ unsigned k; /* number of bits in bit buffer */
DEBG("<dyn");
@@ -807,11 +777,7 @@ STATIC int noinline INIT inflate_dynamic
NEEDBITS(4);
nb = 4 + ((unsigned)b & 0xf); /* number of bit length codes */
DUMPBITS(4);
-#ifdef PKZIP_BUG_WORKAROUND
- if (nl > 288 || nd > 32)
-#else
if (nl > 286 || nd > 30)
-#endif
return 1; /* bad lengths */
DEBG("dyn1 ");
@@ -829,7 +795,7 @@ STATIC int noinline INIT inflate_dynamic
/* build decoding table for trees--single level, 7 bit lookup */
bl = 7;
- if ((i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) {
+ if ((i = huft_build(ll, 19, 19, 0, 0, &tl, &bl))) {
if (i == 1)
huft_free(tl);
return i; /* incomplete code set */
@@ -892,7 +858,7 @@ STATIC int noinline INIT inflate_dynamic
/* build the decoding tables for literal/length and distance codes */
bl = lbits;
- if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) {
+ if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl))) {
DEBG("dyn5b ");
if (i == 1) {
error("incomplete literal tree");
@@ -902,19 +868,14 @@ STATIC int noinline INIT inflate_dynamic
}
DEBG("dyn5c ");
bd = dbits;
- if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) {
+ if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd))) {
DEBG("dyn5d ");
if (i == 1) {
error("incomplete distance tree");
-#ifdef PKZIP_BUG_WORKAROUND
- i = 0;
- }
-#else
huft_free(td);
}
huft_free(tl);
return i; /* incomplete code set */
-#endif
}
DEBG("dyn6 ");
@@ -939,11 +900,11 @@ STATIC int noinline INIT inflate_dynamic
/* inflate_block - decompress a deflated block
* @e: last block flag
*/
-STATIC int INIT inflate_block(int *e)
+static int INIT inflate_block(int *e)
{
unsigned t; /* block type */
- register ulg b; /* bit buffer */
- register unsigned k; /* number of bits in bit buffer */
+ u32 b; /* bit buffer */
+ unsigned k; /* number of bits in bit buffer */
DEBG("<blk");
@@ -983,30 +944,25 @@ STATIC int INIT inflate_block(int *e)
}
/* inflate - decompress an inflated entry */
-STATIC int INIT inflate(void)
+static int INIT inflate(void)
{
int e; /* last block flag */
int r; /* result code */
- unsigned h; /* maximum struct huft's malloc'ed */
void *ptr;
/* initialize window, bit buffer */
- wp = 0;
+ outcnt = 0;
bk = 0;
bb = 0;
/* decompress until the last block */
- h = 0;
do {
- hufts = 0;
gzip_mark(&ptr);
- if ((r = inflate_block(&e)) != 0) {
+ if ((r = inflate_block(&e))) {
gzip_release(&ptr);
return r;
}
gzip_release(&ptr);
- if (hufts > h)
- h = hufts;
} while (!e);
/* Undo too much lookahead. The next read will be byte aligned so we
@@ -1017,13 +973,10 @@ STATIC int INIT inflate(void)
inptr--;
}
- /* flush out slide */
- flush_output(wp);
+ /* flush out window */
+ flush_output(outcnt);
/* return success */
-#ifdef DEBUG
- fprintf(stderr, "<%u> ", h);
-#endif /* DEBUG */
return 0;
}
@@ -1033,8 +986,8 @@ STATIC int INIT inflate(void)
*
**********************************************************************/
-static ulg crc_32_tab[256];
-static ulg crc; /* initialized in makecrc() so it'll reside in bss */
+static u32 crc_32_tab[256];
+static u32 crc; /* initialized in makecrc() so it'll reside in bss */
#define CRC_VALUE (crc ^ 0xffffffffUL)
/*
@@ -1073,7 +1026,7 @@ static void INIT makecrc(void)
}
/* this is initialized here so this code could reside in ROM */
- crc = (ulg)0xffffffffUL; /* shift register contents */
+ crc = 0xffffffffUL; /* shift register contents */
}
/* gzip flag byte */
@@ -1090,11 +1043,11 @@ static void INIT makecrc(void)
*/
static int INIT gunzip(void)
{
- uch flags;
+ u8 flags;
unsigned char magic[2]; /* magic header */
char method;
- ulg orig_crc = 0; /* original crc */
- ulg orig_len = 0; /* original uncompressed length */
+ u32 orig_crc = 0; /* original crc */
+ u32 orig_len = 0; /* original uncompressed length */
int res;
magic[0] = NEXTBYTE();
@@ -1112,16 +1065,16 @@ static int INIT gunzip(void)
return -1;
}
- flags = (uch)get_byte();
- if ((flags & ENCRYPTED) != 0) {
+ flags = (u8)get_byte();
+ if (flags & ENCRYPTED) {
error("Input is encrypted");
return -1;
}
- if ((flags & CONTINUATION) != 0) {
+ if (flags & CONTINUATION) {
error("Multi part input");
return -1;
}
- if ((flags & RESERVED) != 0) {
+ if (flags & RESERVED) {
error("Input has invalid flags");
return -1;
}
@@ -1133,25 +1086,22 @@ static int INIT gunzip(void)
(void)NEXTBYTE(); /* Ignore extra flags for the moment */
(void)NEXTBYTE(); /* Ignore OS type for the moment */
- if ((flags & EXTRA_FIELD) != 0) {
+ if (flags & EXTRA_FIELD) {
unsigned len = (unsigned)NEXTBYTE();
len |= ((unsigned)NEXTBYTE()) << 8;
while (len--)
(void)NEXTBYTE();
}
- /* Get original file name if it was truncated */
- if ((flags & ORIG_NAME) != 0) {
- /* Discard the old name */
- while (NEXTBYTE() != 0) /* null */
+ /* Discard original file name if it was truncated */
+ if (flags & ORIG_NAME)
+ while (NEXTBYTE())
;
- }
/* Discard file comment if any */
- if ((flags & COMMENT) != 0) {
- while (NEXTBYTE() != 0) /* null */
+ if (flags & COMMENT)
+ while (NEXTBYTE())
;
- }
/* Decompress */
if ((res = inflate())) {
@@ -1180,15 +1130,15 @@ static int INIT gunzip(void)
/* crc32 (see algorithm.doc)
* uncompressed input size modulo 2^32
*/
- orig_crc = (ulg)NEXTBYTE();
- orig_crc |= (ulg)NEXTBYTE() << 8;
- orig_crc |= (ulg)NEXTBYTE() << 16;
- orig_crc |= (ulg)NEXTBYTE() << 24;
-
- orig_len = (ulg)NEXTBYTE();
- orig_len |= (ulg)NEXTBYTE() << 8;
- orig_len |= (ulg)NEXTBYTE() << 16;
- orig_len |= (ulg)NEXTBYTE() << 24;
+ orig_crc = (u32)NEXTBYTE();
+ orig_crc |= (u32)NEXTBYTE() << 8;
+ orig_crc |= (u32)NEXTBYTE() << 16;
+ orig_crc |= (u32)NEXTBYTE() << 24;
+
+ orig_len = (u32)NEXTBYTE();
+ orig_len |= (u32)NEXTBYTE() << 8;
+ orig_len |= (u32)NEXTBYTE() << 16;
+ orig_len |= (u32)NEXTBYTE() << 24;
/* Validate decompression */
if (orig_crc != CRC_VALUE) {
-
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