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- #include <stdlib.h>
- #include <unistd.h>
- #include "libbb.h"
- #include "unarchive.h" /* for external decl of check_header_gzip */
- extern 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;
- }
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