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Patch from Matthias Lang <matthias@corelatus.se> to fix gunzip

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error handling and prevent gunzip from hanging.
This commit is contained in:
Eric Andersen 2002-09-16 07:25:41 +00:00
parent a9cc8961ed
commit 8fede28c74
3 changed files with 189 additions and 78 deletions
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89
archival/libunarchive/decompress_unzip.c
View File

@ -390,6 +390,7 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
unsigned ml, md; /* masks for bl and bd bits */
register unsigned long b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
register int input_char;
/* make local copies of globals */
b = bb; /* initialize bit buffer */
@ -401,7 +402,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
md = mask_bits[bd];
for (;;) { /* do until end of block */
while (k < (unsigned) bl) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
if ((e = (t = tl + ((unsigned) b & ml))->e) > 16)
@ -413,7 +416,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
k -= t->b;
e -= 16;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
} while ((e =
@ -435,7 +440,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
/* get length of block to copy */
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
n = t->v.n + ((unsigned) b & mask_bits[e]);
@ -444,7 +451,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
/* decode distance of block to copy */
while (k < (unsigned) bd) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
@ -456,7 +465,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
k -= t->b;
e -= 16;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
} while ((e =
@ -465,7 +476,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
b >>= t->b;
k -= t->b;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
d = w - t->v.n - ((unsigned) b & mask_bits[e]);
@ -541,6 +554,7 @@ static int inflate_block(int *e)
unsigned t; /* block type */
register unsigned long b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
int input_char;
/* make local bit buffer */
b = bb;
@ -548,7 +562,9 @@ static int inflate_block(int *e)
/* read in last block bit */
while (k < 1) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
*e = (int) b & 1;
@ -557,7 +573,9 @@ static int inflate_block(int *e)
/* read in block type */
while (k < 2) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
t = (unsigned) b & 3;
@ -589,14 +607,18 @@ static int inflate_block(int *e)
/* get the length and its complement */
while (k_stored < 16) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
n = ((unsigned) b_stored & 0xffff);
b_stored >>= 16;
k_stored -= 16;
while (k_stored < 16) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
if (n != (unsigned) ((~b_stored) & 0xffff)) {
@ -608,7 +630,9 @@ static int inflate_block(int *e)
/* read and output the compressed data */
while (n--) {
while (k_stored < 8) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
window[w++] = (unsigned char) b_stored;
@ -704,21 +728,27 @@ static int inflate_block(int *e)
/* read in table lengths */
while (k_dynamic < 5) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nl = 257 + ((unsigned) b_dynamic & 0x1f); /* number of literal/length codes */
b_dynamic >>= 5;
k_dynamic -= 5;
while (k_dynamic < 5) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nd = 1 + ((unsigned) b_dynamic & 0x1f); /* number of distance codes */
b_dynamic >>= 5;
k_dynamic -= 5;
while (k_dynamic < 4) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nb = 4 + ((unsigned) b_dynamic & 0xf); /* number of bit length codes */
@ -731,7 +761,9 @@ static int inflate_block(int *e)
/* read in bit-length-code lengths */
for (j = 0; j < nb; j++) {
while (k_dynamic < 3) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
ll[border[j]] = (unsigned) b_dynamic & 7;
@ -757,7 +789,9 @@ static int inflate_block(int *e)
i = l = 0;
while ((unsigned) i < n) {
while (k_dynamic < (unsigned) bl) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = (td = tl + ((unsigned) b_dynamic & m))->b;
@ -768,8 +802,9 @@ static int inflate_block(int *e)
ll[i++] = l = j; /* save last length in l */
} else if (j == 16) { /* repeat last length 3 to 6 times */
while (k_dynamic < 2) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 3 + ((unsigned) b_dynamic & 3);
@ -783,8 +818,9 @@ static int inflate_block(int *e)
}
} else if (j == 17) { /* 3 to 10 zero length codes */
while (k_dynamic < 3) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 3 + ((unsigned) b_dynamic & 7);
@ -799,8 +835,9 @@ static int inflate_block(int *e)
l = 0;
} else { /* j == 18: 11 to 138 zero length codes */
while (k_dynamic < 7) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 11 + ((unsigned) b_dynamic & 0x7f);
@ -953,7 +990,7 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
}
/* Check the compression method */
if (fgetc(l_in_file) != 8) {
if (fgetc(l_in_file) != 8) /* also catches EOF */ {
error_msg("Unknown compression method");
return (-1);
}
@ -969,7 +1006,7 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
/* bit 2 set: extra field present */
const unsigned short extra =
fgetc(l_in_file) + (fgetc(l_in_file) << 8);
if (feof(in_file)) return 1;
for (i = 0; i < extra; i++) {
fgetc(l_in_file);
}
@ -978,13 +1015,13 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
/* Discard original name if any */
if (flags & 0x08) {
/* bit 3 set: original file name present */
while (fgetc(l_in_file) != 0); /* null */
while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */
}
/* Discard file comment if any */
if (flags & 0x10) {
/* bit 4 set: file comment present */
while (fgetc(l_in_file) != 0); /* null */
while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */
}
/* Decompress */

89
archival/libunarchive/unzip.c
View File

@ -390,6 +390,7 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
unsigned ml, md; /* masks for bl and bd bits */
register unsigned long b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
register int input_char;
/* make local copies of globals */
b = bb; /* initialize bit buffer */
@ -401,7 +402,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
md = mask_bits[bd];
for (;;) { /* do until end of block */
while (k < (unsigned) bl) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
if ((e = (t = tl + ((unsigned) b & ml))->e) > 16)
@ -413,7 +416,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
k -= t->b;
e -= 16;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
} while ((e =
@ -435,7 +440,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
/* get length of block to copy */
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
n = t->v.n + ((unsigned) b & mask_bits[e]);
@ -444,7 +451,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
/* decode distance of block to copy */
while (k < (unsigned) bd) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
@ -456,7 +465,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
k -= t->b;
e -= 16;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
} while ((e =
@ -465,7 +476,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
b >>= t->b;
k -= t->b;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
d = w - t->v.n - ((unsigned) b & mask_bits[e]);
@ -541,6 +554,7 @@ static int inflate_block(int *e)
unsigned t; /* block type */
register unsigned long b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
int input_char;
/* make local bit buffer */
b = bb;
@ -548,7 +562,9 @@ static int inflate_block(int *e)
/* read in last block bit */
while (k < 1) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
*e = (int) b & 1;
@ -557,7 +573,9 @@ static int inflate_block(int *e)
/* read in block type */
while (k < 2) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
t = (unsigned) b & 3;
@ -589,14 +607,18 @@ static int inflate_block(int *e)
/* get the length and its complement */
while (k_stored < 16) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
n = ((unsigned) b_stored & 0xffff);
b_stored >>= 16;
k_stored -= 16;
while (k_stored < 16) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
if (n != (unsigned) ((~b_stored) & 0xffff)) {
@ -608,7 +630,9 @@ static int inflate_block(int *e)
/* read and output the compressed data */
while (n--) {
while (k_stored < 8) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
window[w++] = (unsigned char) b_stored;
@ -704,21 +728,27 @@ static int inflate_block(int *e)
/* read in table lengths */
while (k_dynamic < 5) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nl = 257 + ((unsigned) b_dynamic & 0x1f); /* number of literal/length codes */
b_dynamic >>= 5;
k_dynamic -= 5;
while (k_dynamic < 5) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nd = 1 + ((unsigned) b_dynamic & 0x1f); /* number of distance codes */
b_dynamic >>= 5;
k_dynamic -= 5;
while (k_dynamic < 4) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nb = 4 + ((unsigned) b_dynamic & 0xf); /* number of bit length codes */
@ -731,7 +761,9 @@ static int inflate_block(int *e)
/* read in bit-length-code lengths */
for (j = 0; j < nb; j++) {
while (k_dynamic < 3) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
ll[border[j]] = (unsigned) b_dynamic & 7;
@ -757,7 +789,9 @@ static int inflate_block(int *e)
i = l = 0;
while ((unsigned) i < n) {
while (k_dynamic < (unsigned) bl) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = (td = tl + ((unsigned) b_dynamic & m))->b;
@ -768,8 +802,9 @@ static int inflate_block(int *e)
ll[i++] = l = j; /* save last length in l */
} else if (j == 16) { /* repeat last length 3 to 6 times */
while (k_dynamic < 2) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 3 + ((unsigned) b_dynamic & 3);
@ -783,8 +818,9 @@ static int inflate_block(int *e)
}
} else if (j == 17) { /* 3 to 10 zero length codes */
while (k_dynamic < 3) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 3 + ((unsigned) b_dynamic & 7);
@ -799,8 +835,9 @@ static int inflate_block(int *e)
l = 0;
} else { /* j == 18: 11 to 138 zero length codes */
while (k_dynamic < 7) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 11 + ((unsigned) b_dynamic & 0x7f);
@ -953,7 +990,7 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
}
/* Check the compression method */
if (fgetc(l_in_file) != 8) {
if (fgetc(l_in_file) != 8) /* also catches EOF */ {
error_msg("Unknown compression method");
return (-1);
}
@ -969,7 +1006,7 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
/* bit 2 set: extra field present */
const unsigned short extra =
fgetc(l_in_file) + (fgetc(l_in_file) << 8);
if (feof(in_file)) return 1;
for (i = 0; i < extra; i++) {
fgetc(l_in_file);
}
@ -978,13 +1015,13 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
/* Discard original name if any */
if (flags & 0x08) {
/* bit 3 set: original file name present */
while (fgetc(l_in_file) != 0); /* null */
while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */
}
/* Discard file comment if any */
if (flags & 0x10) {
/* bit 4 set: file comment present */
while (fgetc(l_in_file) != 0); /* null */
while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */
}
/* Decompress */

89
libbb/unzip.c
View File

@ -390,6 +390,7 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
unsigned ml, md; /* masks for bl and bd bits */
register unsigned long b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
register int input_char;
/* make local copies of globals */
b = bb; /* initialize bit buffer */
@ -401,7 +402,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
md = mask_bits[bd];
for (;;) { /* do until end of block */
while (k < (unsigned) bl) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
if ((e = (t = tl + ((unsigned) b & ml))->e) > 16)
@ -413,7 +416,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
k -= t->b;
e -= 16;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
} while ((e =
@ -435,7 +440,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
/* get length of block to copy */
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
n = t->v.n + ((unsigned) b & mask_bits[e]);
@ -444,7 +451,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
/* decode distance of block to copy */
while (k < (unsigned) bd) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
@ -456,7 +465,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
k -= t->b;
e -= 16;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
} while ((e =
@ -465,7 +476,9 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
b >>= t->b;
k -= t->b;
while (k < e) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
d = w - t->v.n - ((unsigned) b & mask_bits[e]);
@ -541,6 +554,7 @@ static int inflate_block(int *e)
unsigned t; /* block type */
register unsigned long b; /* bit buffer */
register unsigned k; /* number of bits in bit buffer */
int input_char;
/* make local bit buffer */
b = bb;
@ -548,7 +562,9 @@ static int inflate_block(int *e)
/* read in last block bit */
while (k < 1) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
*e = (int) b & 1;
@ -557,7 +573,9 @@ static int inflate_block(int *e)
/* read in block type */
while (k < 2) {
b |= ((unsigned long) fgetc(in_file)) << k;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b |= ((unsigned long)input_char) << k;
k += 8;
}
t = (unsigned) b & 3;
@ -589,14 +607,18 @@ static int inflate_block(int *e)
/* get the length and its complement */
while (k_stored < 16) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
n = ((unsigned) b_stored & 0xffff);
b_stored >>= 16;
k_stored -= 16;
while (k_stored < 16) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
if (n != (unsigned) ((~b_stored) & 0xffff)) {
@ -608,7 +630,9 @@ static int inflate_block(int *e)
/* read and output the compressed data */
while (n--) {
while (k_stored < 8) {
b_stored |= ((unsigned long) fgetc(in_file)) << k_stored;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_stored |= ((unsigned long)input_char) << k_stored;
k_stored += 8;
}
window[w++] = (unsigned char) b_stored;
@ -704,21 +728,27 @@ static int inflate_block(int *e)
/* read in table lengths */
while (k_dynamic < 5) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nl = 257 + ((unsigned) b_dynamic & 0x1f); /* number of literal/length codes */
b_dynamic >>= 5;
k_dynamic -= 5;
while (k_dynamic < 5) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nd = 1 + ((unsigned) b_dynamic & 0x1f); /* number of distance codes */
b_dynamic >>= 5;
k_dynamic -= 5;
while (k_dynamic < 4) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
nb = 4 + ((unsigned) b_dynamic & 0xf); /* number of bit length codes */
@ -731,7 +761,9 @@ static int inflate_block(int *e)
/* read in bit-length-code lengths */
for (j = 0; j < nb; j++) {
while (k_dynamic < 3) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
ll[border[j]] = (unsigned) b_dynamic & 7;
@ -757,7 +789,9 @@ static int inflate_block(int *e)
i = l = 0;
while ((unsigned) i < n) {
while (k_dynamic < (unsigned) bl) {
b_dynamic |= ((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = (td = tl + ((unsigned) b_dynamic & m))->b;
@ -768,8 +802,9 @@ static int inflate_block(int *e)
ll[i++] = l = j; /* save last length in l */
} else if (j == 16) { /* repeat last length 3 to 6 times */
while (k_dynamic < 2) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 3 + ((unsigned) b_dynamic & 3);
@ -783,8 +818,9 @@ static int inflate_block(int *e)
}
} else if (j == 17) { /* 3 to 10 zero length codes */
while (k_dynamic < 3) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 3 + ((unsigned) b_dynamic & 7);
@ -799,8 +835,9 @@ static int inflate_block(int *e)
l = 0;
} else { /* j == 18: 11 to 138 zero length codes */
while (k_dynamic < 7) {
b_dynamic |=
((unsigned long) fgetc(in_file)) << k_dynamic;
input_char = fgetc(in_file);
if (input_char == EOF) return 1;
b_dynamic |= ((unsigned long)input_char) << k_dynamic;
k_dynamic += 8;
}
j = 11 + ((unsigned) b_dynamic & 0x7f);
@ -953,7 +990,7 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
}
/* Check the compression method */
if (fgetc(l_in_file) != 8) {
if (fgetc(l_in_file) != 8) /* also catches EOF */ {
error_msg("Unknown compression method");
return (-1);
}
@ -969,7 +1006,7 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
/* bit 2 set: extra field present */
const unsigned short extra =
fgetc(l_in_file) + (fgetc(l_in_file) << 8);
if (feof(in_file)) return 1;
for (i = 0; i < extra; i++) {
fgetc(l_in_file);
}
@ -978,13 +1015,13 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
/* Discard original name if any */
if (flags & 0x08) {
/* bit 3 set: original file name present */
while (fgetc(l_in_file) != 0); /* null */
while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */
}
/* Discard file comment if any */
if (flags & 0x10) {
/* bit 4 set: file comment present */
while (fgetc(l_in_file) != 0); /* null */
while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */
}
/* Decompress */