#include?“tar.h“

#include???//?for?strlen?and?memset
#include????//?for?sprintf?snprintf?and?sscanf
#include???//?for?rand
#include?????//?for?time
#include?
#include?

#define?ENABLE_LOGGING

#ifdef?ENABLE_LOGGING
#??define?LOG?printf
#else
#??define?LOG（fmt?args?...）?（（void）0）
#endif

namespace?tar
{
????????const?char?FILL_CHAR?=?‘\0‘;
????????const?int?FILE_NAME_LENGTH?=?100;

????????//?From?http://en.wikipedia.org/wiki/Tar_（computing）#UStar_format
????????typedef?enum?tar_file_type
????????{
????????????????tar_file_type_normal????=?‘0‘
????????????????tar_file_type_hard_link?=?‘1‘
????????????????tar_file_type_soft_link?=?‘2‘
????????????????tar_file_type_directory?=?‘5‘
????????}?tar_file_type_t;

????????struct?tar_header
????????{
????????????????char?name[FILE_NAME_LENGTH];??//?file?name
????????????????char?mode[8];?????????????????//?file?mode
????????????????char?uid[8];??????????????????//?Owner‘s?numeric?user?ID
????????????????char?gid[8];??????????????????//?Group‘s?numeric?user?ID
????????????????char?size[12];????????????????//?File?size?in?bytes?（octal?base）
????????????????char?mtime[12];???????????????//?Last?modification?time?in
??????????????????????????????????????????????//?numeric?Unix?time?format?（octal）
????????????????char?checksum[8];?????????????//?Checksum?for?header?record
????????????????char?typeflag[1];?????????????//?file?type?see?tar_file_type_t
????????????????char?linkname[100];???????????//?Name?of?linked?file
????????????????char?magic[6];????????????????//?UStar?indicator?“ustar“
????????????????char?version[2];??????????????//?UStar?version?“00“
????????????????char?uname[32];???????????????//?Owner?user?name
????????????????char?gname[32];???????????????//?Owner?group?name
????????????????char?devmajor[8];?????????????//?Device?major?number
????????????????char?devminor[8];?????????????//?Device?minor?number
????????????????char?prefix[155];?????????????//?Filename?prefix
????????????????char?pad[12];?????????????????//?padding
????????};

????????void?header_set_metadata（tar_header*?header）
????????{
????????????????std::memset（header?0?sizeof（tar_header））;

????????????????std::sprintf（header->magic?“ustar“）;
????????????????std::sprintf（header->mtime?“%011lo“?std::time（NULL））;
????????????????std::sprintf（header->mode?“%07o“?0644）;
????????????????//TODO
????????????????std::sprintf（header->uname?“unkown“）;??//?...?a?bit?random
????????????????std::sprintf（header->gname?“users“）;
????????????????header->typeflag[0]?=?0;??//?always?just?a?normal?file
????????}

????????/*?From?Wikipedia:?The?checksum?is?calculated?by?taking?the?sum?of?the
?????????*?unsigned?byte?values?of?the?header?record?with?the?eight?checksum
?????????*?bytes?taken?to?be?ascii?spaces.?*/
????????void?header_set_checksum（tar_header*?header）
????????{
????????????????unsigned?int?sum?=?0;

?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????12117??2018-02-01?16:31??tar\tar.cpp

?????文件???????2972??2018-01-23?09:59??tar\tar.h

?????文件????????339??2018-02-05?18:58??tar\tar_test.txt

?????文件?????????54??2018-02-02?14:12??tar\資料\資料.txt

?????目錄??????????0??2018-02-02?14:12??tar\資料

?????目錄??????????0??2018-02-02?14:12??tar

-----------?---------??----------?-----??----

????????????????15482????????????????????6