Last change
on this file since 3343 was 3320, checked in by Bruno Cornec, 10 years ago |
- Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in
the move to 3.0
|
-
Property svn:eol-style
set to
native
|
File size:
1.3 KB
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Rev | Line | |
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[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 4 | */
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| 5 |
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| 6 | #include "libbb.h"
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| 7 | #include "unarchive.h" /* for external decl of check_header_gzip_or_die */
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| 8 |
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| 9 | void check_header_gzip_or_die(int src_fd)
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| 10 | {
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| 11 | union {
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| 12 | unsigned char raw[8];
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| 13 | struct {
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| 14 | unsigned char method;
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| 15 | unsigned char flags;
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| 16 | unsigned int mtime;
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| 17 | unsigned char xtra_flags;
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| 18 | unsigned char os_flags;
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| 19 | } formatted;
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| 20 | } header;
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| 21 |
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| 22 | xread(src_fd, header.raw, 8);
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| 23 |
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| 24 | /* Check the compression method */
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| 25 | if (header.formatted.method != 8) {
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| 26 | bb_error_msg_and_die("unknown compression method %d",
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| 27 | header.formatted.method);
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| 28 | }
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| 29 |
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| 30 | if (header.formatted.flags & 0x04) {
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| 31 | /* bit 2 set: extra field present */
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| 32 | unsigned extra_short;
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| 33 |
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| 34 | extra_short = xread_char(src_fd) + (xread_char(src_fd) << 8);
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| 35 | while (extra_short > 0) {
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| 36 | /* Ignore extra field */
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| 37 | xread_char(src_fd);
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| 38 | extra_short--;
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| 39 | }
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| 40 | }
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| 41 |
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| 42 | /* Discard original name if any */
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| 43 | if (header.formatted.flags & 0x08) {
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| 44 | /* bit 3 set: original file name present */
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| 45 | while (xread_char(src_fd) != 0);
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| 46 | }
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| 47 |
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| 48 | /* Discard file comment if any */
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| 49 | if (header.formatted.flags & 0x10) {
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| 50 | /* bit 4 set: file comment present */
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| 51 | while (xread_char(src_fd) != 0);
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| 52 | }
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| 53 |
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| 54 | /* Read the header checksum */
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| 55 | if (header.formatted.flags & 0x02) {
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| 56 | xread_char(src_fd);
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| 57 | xread_char(src_fd);
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| 58 | }
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| 59 | }
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