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Stopped doing assignments inside expressions.

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Who wrote this gem, I wonder?

n -= (e = (e = gunzip_wsize - ((d &= gunzip_wsize - 1) > w ? d : w)) > n ? n : e);
This commit is contained in:
Denis Vlasenko
2007-01-05 19:49:02 +00:00
parent cc33ef12d2
commit 447b543eaf
2 changed files with 110 additions and 58 deletions
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106
archival/libunarchive/decompress_unzip.c
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@@ -116,7 +116,9 @@ static unsigned fill_bitbuffer(unsigned bitbuffer, unsigned *current, const unsi
/* Leave the first 4 bytes empty so we can always unwind the bitbuffer
* to the front of the bytebuffer, leave 4 bytes free at end of tail
* so we can easily top up buffer in check_trailer_gzip() */
if (1 > (bytebuffer_size = safe_read(gunzip_src_fd, &bytebuffer[4], bytebuffer_max - 8)))
bytebuffer_size = safe_read(gunzip_src_fd, &bytebuffer[4], bytebuffer_max - 8);
if (1 > bytebuffer_size)
//shouldn't we propagate error?
bb_error_msg_and_die("unexpected end of file");
bytebuffer_size += 4;
bytebuffer_offset = 4;
@@ -193,7 +195,7 @@ int huft_build(unsigned *b, const unsigned n,
eob_len = n > 256 ? b[256] : BMAX;
/* Generate counts for each bit length */
memset((void *)c, 0, sizeof(c));
memset(c, 0, sizeof(c));
p = b;
i = n;
do {
@@ -215,11 +217,13 @@ int huft_build(unsigned *b, const unsigned n,
/* Adjust last length count to fill out codes, if needed */
for (y = 1 << j; j < i; j++, y <<= 1) {
if ((y -= c[j]) < 0) {
y -= c[j];
if (y < 0) {
return 2; /* bad input: more codes than bits */
}
}
if ((y -= c[i]) < 0) {
y -= c[i];
if (y < 0) {
return 2;
}
c[i] += y;
@@ -229,14 +233,16 @@ int huft_build(unsigned *b, const unsigned n,
p = c + 1;
xp = x + 2;
while (--i) { /* note that i == g from above */
*xp++ = (j += *p++);
j += *p++;
*xp++ = j;
}
/* Make a table of values in order of bit lengths */
p = b;
i = 0;
do {
if ((j = *p++) != 0) {
j = *p++;
if (j != 0) {
v[x[j]++] = i;
}
} while (++i < n);
@@ -260,13 +266,17 @@ int huft_build(unsigned *b, const unsigned n,
w = ws[++htl];
/* compute minimum size table less than or equal to *m bits */
z = (z = g - w) > *m ? *m : z; /* upper limit on table size */
if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table */
z = g - w;
z = z > *m ? *m : z; /* upper limit on table size */
j = k - w;
f = 1 << j;
if (f > a + 1) { /* try a k-w bit table */
/* too few codes for k-w bit table */
f -= a + 1; /* deduct codes from patterns left */
xp = c + k;
while (++j < z) { /* try smaller tables up to z bits */
if ((f <<= 1) <= *++xp) {
f <<= 1;
if (f <= *++xp) {
break; /* enough codes to use up j bits */
}
f -= *xp; /* else deduct codes from patterns */
@@ -338,6 +348,8 @@ int huft_build(unsigned *b, const unsigned n,
* tl, td: literal/length and distance decoder tables
* bl, bd: number of bits decoded by tl[] and td[]
*/
/* called with setup==1 once from inflate_block */
/* called once with setup==0 from inflate_get_next_window */
static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, const unsigned my_bd, int setup)
{
static unsigned e; /* table entry flag/number of extra bits */
@@ -371,7 +383,9 @@ static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, c
while (1) { /* do until end of block */
b = fill_bitbuffer(b, &k, bl);
if ((e = (t = tl + ((unsigned) b & ml))->e) > 16)
t = tl + ((unsigned) b & ml);
e = t->e;
if (e > 16)
do {
if (e == 99) {
bb_error_msg_and_die("inflate_codes error 1");
@@ -380,8 +394,9 @@ static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, c
k -= t->b;
e -= 16;
b = fill_bitbuffer(b, &k, e);
} while ((e =
(t = t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16);
t = t->v.t + ((unsigned) b & mask_bits[e]);
e = t->e;
} while (e > 16);
b >>= t->b;
k -= t->b;
if (e == 16) { /* then it's a literal */
@@ -407,7 +422,9 @@ static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, c
/* decode distance of block to copy */
b = fill_bitbuffer(b, &k, bd);
if ((e = (t = td + ((unsigned) b & md))->e) > 16)
t = td + ((unsigned) b & md);
e = t->e;
if (e > 16)
do {
if (e == 99)
bb_error_msg_and_die("inflate_codes error 2");
@@ -415,9 +432,9 @@ static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, c
k -= t->b;
e -= 16;
b = fill_bitbuffer(b, &k, e);
} while ((e =
(t =
t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16);
t = t->v.t + ((unsigned) b & mask_bits[e]);
e = t->e;
} while (e > 16);
b >>= t->b;
k -= t->b;
b = fill_bitbuffer(b, &k, e);
@@ -426,26 +443,30 @@ static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, c
k -= e;
/* do the copy */
do_copy: do {
n -= (e =
(e =
gunzip_wsize - ((d &= gunzip_wsize - 1) > w ? d : w)) > n ? n : e);
/* copy to new buffer to prevent possible overwrite */
do_copy:
do {
/* Was: n -= (e = (e = gunzip_wsize - ((d &= gunzip_wsize - 1) > w ? d : w)) > n ? n : e); */
/* Who wrote THAT?? rewritten as: */
d &= gunzip_wsize - 1;
e = gunzip_wsize - (d > w ? d : w);
if (e > n) e = n;
n -= e;
/* copy to new buffer to prevent possible overwrite */
if (w - d >= e) { /* (this test assumes unsigned comparison) */
memcpy(gunzip_window + w, gunzip_window + d, e);
w += e;
d += e;
} else {
/* do it slow to avoid memcpy() overlap */
/* !NOMEMCPY */
/* do it slow to avoid memcpy() overlap */
/* !NOMEMCPY */
do {
gunzip_window[w++] = gunzip_window[d++];
} while (--e);
}
if (w == gunzip_wsize) {
gunzip_outbuf_count = (w);
if (n) resumeCopy = 1;
else resumeCopy = 0;
resumeCopy = (n != 0);
//flush_gunzip_window();
w = 0;
return 1;
@@ -469,9 +490,12 @@ do_copy: do {
return 0;
}
/* called once (setup==1) from inflate_block */
/* and once (setup==0) from inflate_get_next_window */
static int inflate_stored(int my_n, int my_b_stored, int my_k_stored, int setup)
{
static unsigned n, b_stored, k_stored, w;
if (setup) {
n = my_n;
b_stored = my_b_stored;
@@ -509,7 +533,8 @@ static int inflate_stored(int my_n, int my_b_stored, int my_k_stored, int setup)
*
* GLOBAL VARIABLES: bb, kk,
*/
// Return values: -1 = inflate_stored, -2 = inflate_codes
/* Return values: -1 = inflate_stored, -2 = inflate_codes */
/* One callsite in inflate_get_next_window */
static int inflate_block(int *e)
{
unsigned t; /* block type */
@@ -597,7 +622,8 @@ static int inflate_block(int *e)
l[i] = 8;
}
bl = 7;
if ((i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl)) != 0) {
i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl);
if (i != 0) {
return i;
}
@@ -606,7 +632,8 @@ static int inflate_block(int *e)
l[i] = 5;
}
bd = 5;
if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) {
i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd);
if (i > 1) {
huft_free(tl);
return i;
}
@@ -745,19 +772,21 @@ static int inflate_block(int *e)
/* build the decoding tables for literal/length and distance codes */
bl = lbits;
if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) {
i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl);
if (i != 0) {
if (i == 1) {
bb_error_msg_and_die("incomplete literal tree");
huft_free(tl);
/* huft_free(tl); */
}
return i; /* incomplete code set */
}
bd = dbits;
if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) {
i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd);
if (i != 0) {
if (i == 1) {
bb_error_msg_and_die("incomplete distance tree");
huft_free(td);
/* huft_free(td); */
}
huft_free(tl);
return i; /* incomplete code set */
@@ -776,6 +805,7 @@ static int inflate_block(int *e)
}
}
/* Two callsites, both in inflate_get_next_window */
static void calculate_gunzip_crc(void)
{
int n;
@@ -785,6 +815,7 @@ static void calculate_gunzip_crc(void)
gunzip_bytes_out += gunzip_outbuf_count;
}
/* One callsite in inflate_unzip */
static int inflate_get_next_window(void)
{
static int method = -1; // Method == -1 for stored, -2 for codes
@@ -823,7 +854,8 @@ static int inflate_get_next_window(void)
/* Doesnt get here */
}
/* Initialise bytebuffer, be careful not to overfill the buffer */
/* Initialize bytebuffer, be careful not to overfill the buffer */
/* Called from archival/unzip.c */
void inflate_init(unsigned bufsize)
{
/* Set the bytebuffer size, default is same as gunzip_wsize */
@@ -832,11 +864,13 @@ void inflate_init(unsigned bufsize)
bytebuffer_size = 0;
}
/* Called from archival/unzip.c */
void inflate_cleanup(void)
{
free(bytebuffer);
}
/* Called from inflate_gunzip() and archival/unzip.c */
USE_DESKTOP(long long) int
inflate_unzip(int in, int out)
{
@@ -864,7 +898,7 @@ inflate_unzip(int in, int out)
while (1) {
int ret = inflate_get_next_window();
nwrote = full_write(out, gunzip_window, gunzip_outbuf_count);
if (nwrote == -1) {
if (nwrote != gunzip_outbuf_count) {
bb_perror_msg("write");
return -1;
}
@@ -901,6 +935,7 @@ inflate_gunzip(int in, int out)
count = bytebuffer_size - bytebuffer_offset;
if (count < 8) {
xread(in, &bytebuffer[bytebuffer_size], 8 - count);
//shouldn't we propagate error?
bytebuffer_size += 8 - count;
}
for (count = 0; count != 4; count++) {
@@ -917,7 +952,8 @@ inflate_gunzip(int in, int out)
/* Validate decompression - size */
if (gunzip_bytes_out !=
(bytebuffer[bytebuffer_offset] | (bytebuffer[bytebuffer_offset+1] << 8) |
(bytebuffer[bytebuffer_offset+2] << 16) | (bytebuffer[bytebuffer_offset+3] << 24))) {
(bytebuffer[bytebuffer_offset+2] << 16) | (bytebuffer[bytebuffer_offset+3] << 24))
) {
bb_error_msg("incorrect length");
return -1;
}