mirror of
https://github.com/sheumann/hush.git
synced 2024-12-30 05:29:47 +00:00
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include "libbb.h"
|
|
#include "unarchive.h" /* for external decl of check_header_gzip */
|
|
|
|
void check_header_gzip(int src_fd)
|
|
{
|
|
union {
|
|
unsigned char raw[8];
|
|
struct {
|
|
unsigned char method;
|
|
unsigned char flags;
|
|
unsigned int mtime;
|
|
unsigned char xtra_flags;
|
|
unsigned char os_flags;
|
|
} formated;
|
|
} header;
|
|
|
|
bb_xread_all(src_fd, header.raw, 8);
|
|
|
|
/* Check the compression method */
|
|
if (header.formated.method != 8) {
|
|
bb_error_msg_and_die("Unknown compression method %d",
|
|
header.formated.method);
|
|
}
|
|
|
|
if (header.formated.flags & 0x04) {
|
|
/* bit 2 set: extra field present */
|
|
unsigned char extra_short;
|
|
|
|
extra_short = bb_xread_char(src_fd) + (bb_xread_char(src_fd) << 8);
|
|
while (extra_short > 0) {
|
|
/* Ignore extra field */
|
|
bb_xread_char(src_fd);
|
|
extra_short--;
|
|
}
|
|
}
|
|
|
|
/* Discard original name if any */
|
|
if (header.formated.flags & 0x08) {
|
|
/* bit 3 set: original file name present */
|
|
while(bb_xread_char(src_fd) != 0);
|
|
}
|
|
|
|
/* Discard file comment if any */
|
|
if (header.formated.flags & 0x10) {
|
|
/* bit 4 set: file comment present */
|
|
while(bb_xread_char(src_fd) != 0);
|
|
}
|
|
|
|
/* Read the header checksum */
|
|
if (header.formated.flags & 0x02) {
|
|
bb_xread_char(src_fd);
|
|
bb_xread_char(src_fd);
|
|
}
|
|
|
|
return;
|
|
}
|