diff options
Diffstat (limited to 'archival/libunarchive/decompress_bunzip2.c')
| -rw-r--r-- | archival/libunarchive/decompress_bunzip2.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/archival/libunarchive/decompress_bunzip2.c b/archival/libunarchive/decompress_bunzip2.c index 654dc28..b53720f 100644 --- a/archival/libunarchive/decompress_bunzip2.c +++ b/archival/libunarchive/decompress_bunzip2.c @@ -590,7 +590,8 @@ int FAST_FUNC start_bunzip(bunzip_data **bdp, int in_fd, const unsigned char *in bunzip_data *bd; unsigned i; enum { - BZh0 = ('B' << 24) + ('Z' << 16) + ('h' << 8) + '0' + BZh0 = ('B' << 24) + ('Z' << 16) + ('h' << 8) + '0', + h0 = ('h' << 8) + '0', }; /* Figure out how much data to allocate */ @@ -617,12 +618,18 @@ int FAST_FUNC start_bunzip(bunzip_data **bdp, int in_fd, const unsigned char *in if (i) return i; /* Ensure that file starts with "BZh['1'-'9']." */ - i = get_bits(bd, 32); - if ((unsigned)(i - BZh0 - 1) >= 9) return RETVAL_NOT_BZIP_DATA; + /* Update: now caller verifies 1st two bytes, makes .gz/.bz2 + * integration easier */ + /* was: */ + /* i = get_bits(bd, 32); */ + /* if ((unsigned)(i - BZh0 - 1) >= 9) return RETVAL_NOT_BZIP_DATA; */ + i = get_bits(bd, 16); + if ((unsigned)(i - h0 - 1) >= 9) return RETVAL_NOT_BZIP_DATA; /* Fourth byte (ascii '1'-'9') indicates block size in units of 100k of uncompressed data. Allocate intermediate buffer for block. */ - bd->dbufSize = 100000 * (i - BZh0); + /* bd->dbufSize = 100000 * (i - BZh0); */ + bd->dbufSize = 100000 * (i - h0); /* Cannot use xmalloc - may leak bd in NOFORK case! */ bd->dbuf = malloc_or_warn(bd->dbufSize * sizeof(int)); @@ -682,6 +689,17 @@ unpack_bz2_stream(int src_fd, int dst_fd) return i ? i : USE_DESKTOP(total_written) + 0; } +USE_DESKTOP(long long) int FAST_FUNC +unpack_bz2_stream_prime(int src_fd, int dst_fd) +{ + unsigned char magic[2]; + xread(src_fd, magic, 2); + if (magic[0] != 'B' || magic[1] != 'Z') { + bb_error_msg_and_die("invalid magic"); + } + return unpack_bz2_stream(src_fd, dst_fd); +} + #ifdef TESTING static char *const bunzip_errors[] = { @@ -693,9 +711,10 @@ static char *const bunzip_errors[] = { /* Dumb little test thing, decompress stdin to stdout */ int main(int argc, char **argv) { - int i = unpack_bz2_stream(0, 1); + int i; char c; + int i = unpack_bz2_stream_prime(0, 1); if (i < 0) fprintf(stderr, "%s\n", bunzip_errors[-i]); else if (read(STDIN_FILENO, &c, 1)) |