From 8fede28c7408b2231a50c88da22c2e07f26f6d56 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Mon, 16 Sep 2002 07:25:41 +0000 Subject: Patch from Matthias Lang to fix gunzip error handling and prevent gunzip from hanging. --- archival/libunarchive/decompress_unzip.c | 89 ++++++++++++++++++++++---------- archival/libunarchive/unzip.c | 89 ++++++++++++++++++++++---------- libbb/unzip.c | 89 ++++++++++++++++++++++---------- 3 files changed, 189 insertions(+), 78 deletions(-) diff --git a/archival/libunarchive/decompress_unzip.c b/archival/libunarchive/decompress_unzip.c index 0da60c3be..d84067068 100644 --- a/archival/libunarchive/decompress_unzip.c +++ b/archival/libunarchive/decompress_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 */ diff --git a/archival/libunarchive/unzip.c b/archival/libunarchive/unzip.c index 0da60c3be..d84067068 100644 --- a/archival/libunarchive/unzip.c +++ b/archival/libunarchive/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 */ 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 */ -- cgit v1.2.3