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Diffstat (limited to 'libbb/unzip.c')
-rw-r--r--libbb/unzip.c89
1 files changed, 63 insertions, 26 deletions
diff --git a/libbb/unzip.c b/libbb/unzip.c
index 0da60c3be..d84067068 100644
--- a/libbb/unzip.c
+++ b/libbb/unzip.c
@@ -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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 03:27:56 +0000