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*: tar-related cleanups: move struct to unarchive.h; move help to tar.c

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-06-26 18:21:36 +02:00
parent d0a8a0d312
commit 52827e3ebc
5 changed files with 118 additions and 153 deletions
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40
archival/libunarchive/get_header_tar.c
View File

@ -118,34 +118,10 @@ static char *get_selinux_sctx_from_pax_hdr(archive_handle_t *archive_handle, uns
}
#endif
void BUG_tar_header_size(void);
char FAST_FUNC get_header_tar(archive_handle_t *archive_handle)
{
file_header_t *file_header = archive_handle->file_header;
struct {
/* ustar header, Posix 1003.1 */
char name[100]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
char gid[8]; /* 116-123 */
char size[12]; /* 124-135 */
char mtime[12]; /* 136-147 */
char chksum[8]; /* 148-155 */
char typeflag; /* 156-156 */
char linkname[100]; /* 157-256 */
/* POSIX: "ustar" NUL "00" */
/* GNU tar: "ustar " NUL */
/* Normally it's defined as magic[6] followed by
* version[2], but we put them together to simplify code
*/
char magic[8]; /* 257-264 */
char uname[32]; /* 265-296 */
char gname[32]; /* 297-328 */
char devmajor[8]; /* 329-336 */
char devminor[8]; /* 337-344 */
char prefix[155]; /* 345-499 */
char padding[12]; /* 500-512 */
} tar;
struct tar_header_t tar;
char *cp;
int i, sum_u, sum;
#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
@ -162,9 +138,6 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle)
# define p_linkname 0
#endif
if (sizeof(tar) != 512)
BUG_tar_header_size();
#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS || ENABLE_FEATURE_TAR_SELINUX
again:
#endif
@ -230,18 +203,21 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle)
* we can switch to get_header_tar_gz/bz2/lzma().
* Needs seekable fd. I wish recv(MSG_PEEK) works
* on any fd... */
#if ENABLE_FEATURE_SEAMLESS_GZ
# if ENABLE_FEATURE_SEAMLESS_GZ
if (tar.name[0] == 0x1f && tar.name[1] == (char)0x8b) { /* gzip */
get_header_ptr = get_header_tar_gz;
} else
#endif
#if ENABLE_FEATURE_SEAMLESS_BZ2
# endif
# if ENABLE_FEATURE_SEAMLESS_BZ2
if (tar.name[0] == 'B' && tar.name[1] == 'Z'
&& tar.name[2] == 'h' && isdigit(tar.name[3])
) { /* bzip2 */
get_header_ptr = get_header_tar_bz2;
} else
#endif
# endif
# if ENABLE_FEATURE_SEAMLESS_XZ
//TODO
# endif
goto err;
/* Two different causes for lseek() != 0:
* unseekable fd (would like to support that too, but...),

107
archival/tar.c
View File

@ -48,37 +48,6 @@
#if ENABLE_FEATURE_TAR_CREATE
/* Tar file constants */
#define TAR_BLOCK_SIZE 512
/* POSIX tar Header Block, from POSIX 1003.1-1990 */
#define NAME_SIZE 100
#define NAME_SIZE_STR "100"
typedef struct TarHeader { /* byte offset */
char name[NAME_SIZE]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
char gid[8]; /* 116-123 */
char size[12]; /* 124-135 */
char mtime[12]; /* 136-147 */
char chksum[8]; /* 148-155 */
char typeflag; /* 156-156 */
char linkname[NAME_SIZE]; /* 157-256 */
/* POSIX: "ustar" NUL "00" */
/* GNU tar: "ustar " NUL */
/* Normally it's defined as magic[6] followed by
* version[2], but we put them together to save code.
*/
char magic[8]; /* 257-264 */
char uname[32]; /* 265-296 */
char gname[32]; /* 297-328 */
char devmajor[8]; /* 329-336 */
char devminor[8]; /* 337-344 */
char prefix[155]; /* 345-499 */
char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
} TarHeader;
/*
** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
** the only functions that deal with the HardLinkInfo structure.
@ -193,7 +162,7 @@ static void putOctal(char *cp, int len, off_t value)
}
#define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
static void chksum_and_xwrite(int fd, struct TarHeader* hp)
static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
{
/* POSIX says that checksum is done on unsigned bytes
* (Sun and HP-UX gets it wrong... more details in
@ -235,7 +204,7 @@ static void writeLongname(int fd, int type, const char *name, int dir)
"00000000000",
"00000000000",
};
struct TarHeader header;
struct tar_header_t header;
int size;
dir = !!dir; /* normalize: 0/1 */
@ -262,17 +231,13 @@ static void writeLongname(int fd, int type, const char *name, int dir)
#endif
/* Write out a tar header for the specified file/directory/whatever */
void BUG_tar_header_size(void);
static int writeTarHeader(struct TarBallInfo *tbInfo,
const char *header_name, const char *fileName, struct stat *statbuf)
{
struct TarHeader header;
if (sizeof(header) != 512)
BUG_tar_header_size();
memset(&header, 0, sizeof(struct TarHeader));
struct tar_header_t header;
memset(&header, 0, sizeof(header));
strncpy(header.name, header_name, sizeof(header.name));
/* POSIX says to mask mode with 07777. */
@ -738,6 +703,68 @@ static void handle_SIGCHLD(int status)
}
#endif
//usage:#define tar_trivial_usage
//usage: "-[" IF_FEATURE_TAR_CREATE("c") "xt" IF_FEATURE_SEAMLESS_GZ("z")
//usage: IF_FEATURE_SEAMLESS_BZ2("j") IF_FEATURE_SEAMLESS_LZMA("a")
//usage: IF_FEATURE_SEAMLESS_Z("Z") IF_FEATURE_TAR_NOPRESERVE_TIME("m") "vO] "
//usage: IF_FEATURE_TAR_FROM("[-X FILE] ")
//usage: "[-f TARFILE] [-C DIR] [FILE]..."
//usage:#define tar_full_usage "\n\n"
//usage: IF_FEATURE_TAR_CREATE("Create, extract, ")
//usage: IF_NOT_FEATURE_TAR_CREATE("Extract ")
//usage: "or list files from a tar file\n"
//usage: "\nOperation:"
//usage: IF_FEATURE_TAR_CREATE(
//usage: "\n c Create"
//usage: )
//usage: "\n x Extract"
//usage: "\n t List"
//usage: "\nOptions:"
//usage: "\n f Name of TARFILE ('-' for stdin/out)"
//usage: "\n C Change to DIR before operation"
//usage: "\n v Verbose"
//usage: IF_FEATURE_SEAMLESS_GZ(
//usage: "\n z (De)compress using gzip"
//usage: )
//usage: IF_FEATURE_SEAMLESS_BZ2(
//usage: "\n j (De)compress using bzip2"
//usage: )
//usage: IF_FEATURE_SEAMLESS_LZMA(
//usage: "\n a (De)compress using lzma"
//usage: )
//usage: IF_FEATURE_SEAMLESS_Z(
//usage: "\n Z (De)compress using compress"
//usage: )
//usage: "\n O Extract to stdout"
//usage: IF_FEATURE_TAR_CREATE(
//usage: "\n h Follow symlinks"
//usage: )
//usage: IF_FEATURE_TAR_NOPRESERVE_TIME(
//usage: "\n m Don't restore mtime"
//usage: )
//usage: IF_FEATURE_TAR_FROM(
//usage: IF_FEATURE_TAR_LONG_OPTIONS(
//usage: "\n exclude File to exclude"
//usage: )
//usage: "\n X File with names to exclude"
//usage: "\n T File with names to include"
//usage: )
//usage:
//usage:#define tar_example_usage
//usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
//usage: "$ tar -cf /tmp/tarball.tar /usr/local\n"
// Supported but aren't in --help:
// o no-same-owner
// p same-permissions
// k keep-old
// numeric-owner
// no-same-permissions
// overwrite
//IF_FEATURE_TAR_TO_COMMAND(
// to-command
//)
enum {
OPTBIT_KEEP_OLD = 8,
IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)

33
include/unarchive.h
View File

@ -113,6 +113,39 @@ typedef struct archive_handle_t {
#define ARCHIVE_O_TRUNC (1 << 8)
/* POSIX tar Header Block, from POSIX 1003.1-1990 */
#define TAR_BLOCK_SIZE 512
#define NAME_SIZE 100
#define NAME_SIZE_STR "100"
typedef struct tar_header_t { /* byte offset */
char name[NAME_SIZE]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
char gid[8]; /* 116-123 */
char size[12]; /* 124-135 */
char mtime[12]; /* 136-147 */
char chksum[8]; /* 148-155 */
char typeflag; /* 156-156 */
char linkname[NAME_SIZE]; /* 157-256 */
/* POSIX: "ustar" NUL "00" */
/* GNU tar: "ustar " NUL */
/* Normally it's defined as magic[6] followed by
* version[2], but we put them together to save code.
*/
char magic[8]; /* 257-264 */
char uname[32]; /* 265-296 */
char gname[32]; /* 297-328 */
char devmajor[8]; /* 329-336 */
char devminor[8]; /* 337-344 */
char prefix[155]; /* 345-499 */
char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
} tar_header_t;
struct BUG_tar_header {
char c[sizeof(tar_header_t) == TAR_BLOCK_SIZE ? 1 : -1];
};
/* Info struct unpackers can fill out to inform users of thing like
* timestamps of unpacked files */
typedef struct unpack_info_t {

48
include/usage.src.h
View File

@ -4273,54 +4273,6 @@ INSERT
#define tac_full_usage "\n\n" \
"Concatenate FILEs and print them in reverse"
#define tar_trivial_usage \
"-[" IF_FEATURE_TAR_CREATE("c") "xt" IF_FEATURE_SEAMLESS_GZ("z") \
IF_FEATURE_SEAMLESS_BZ2("j") IF_FEATURE_SEAMLESS_LZMA("a") \
IF_FEATURE_SEAMLESS_Z("Z") IF_FEATURE_TAR_NOPRESERVE_TIME("m") "vO] " \
IF_FEATURE_TAR_FROM("[-X FILE] ") \
"[-f TARFILE] [-C DIR] [FILE]..."
#define tar_full_usage "\n\n" \
IF_FEATURE_TAR_CREATE("Create, extract, ") \
IF_NOT_FEATURE_TAR_CREATE("Extract ") \
"or list files from a tar file\n" \
"\nOptions:" \
IF_FEATURE_TAR_CREATE( \
"\n c Create" \
) \
"\n x Extract" \
"\n t List" \
"\nArchive format selection:" \
IF_FEATURE_SEAMLESS_GZ( \
"\n z Filter the archive through gzip" \
) \
IF_FEATURE_SEAMLESS_BZ2( \
"\n j Filter the archive through bzip2" \
) \
IF_FEATURE_SEAMLESS_LZMA( \
"\n a Filter the archive through lzma" \
) \
IF_FEATURE_SEAMLESS_Z( \
"\n Z Filter the archive through compress" \
) \
IF_FEATURE_TAR_NOPRESERVE_TIME( \
"\n m Do not restore mtime" \
) \
"\nFile selection:" \
"\n f Name of TARFILE or \"-\" for stdin" \
"\n O Extract to stdout" \
IF_FEATURE_TAR_FROM( \
IF_FEATURE_TAR_LONG_OPTIONS( \
"\n exclude File to exclude" \
) \
"\n X File with names to exclude" \
) \
"\n C Change to DIR before operation" \
"\n v Verbose" \
#define tar_example_usage \
"$ zcat /tmp/tarball.tar.gz | tar -xf -\n" \
"$ tar -cf /tmp/tarball.tar /usr/local\n"
#define taskset_trivial_usage \
"[-p] [MASK] [PID | PROG ARGS]"
#define taskset_full_usage "\n\n" \

43
procps/smemcap.c
View File

@ -20,42 +20,19 @@
//config: a memory usage statistic tool.
#include "libbb.h"
struct tar_header {
char name[100]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
char gid[8]; /* 116-123 */
char size[12]; /* 124-135 */
char mtime[12]; /* 136-147 */
char chksum[8]; /* 148-155 */
char typeflag; /* 156-156 */
char linkname[100]; /* 157-256 */
/* POSIX: "ustar" NUL "00" */
/* GNU tar: "ustar " NUL */
/* Normally it's defined as magic[6] followed by
* version[2], but we put them together to save code.
*/
char magic[8]; /* 257-264 */
char uname[32]; /* 265-296 */
char gname[32]; /* 297-328 */
char devmajor[8]; /* 329-336 */
char devminor[8]; /* 337-344 */
char prefix[155]; /* 345-499 */
char padding[12]; /* 500-512 (pad to exactly TAR_512) */
};
#include "unarchive.h"
struct fileblock {
struct fileblock *next;
char data[512];
char data[TAR_BLOCK_SIZE];
};
static void writeheader(const char *path, struct stat *sb, int type)
{
struct tar_header header;
struct tar_header_t header;
int i, sum;
memset(&header, 0, 512);
memset(&header, 0, TAR_BLOCK_SIZE);
strcpy(header.name, path);
sprintf(header.mode, "%o", sb->st_mode & 0777);
/* careful to not overflow fields! */
@ -73,11 +50,11 @@ static void writeheader(const char *path, struct stat *sb, int type)
* digits, followed by a NUL like the other fields... */
header.chksum[7] = ' ';
sum = ' ' * 7;
for (i = 0; i < 512; i++)
for (i = 0; i < TAR_BLOCK_SIZE; i++)
sum += ((unsigned char*)&header)[i];
sprintf(header.chksum, "%06o", sum);
xwrite(STDOUT_FILENO, &header, 512);
xwrite(STDOUT_FILENO, &header, TAR_BLOCK_SIZE);
}
static void archivefile(const char *path)
@ -94,10 +71,10 @@ static void archivefile(const char *path)
cur = xzalloc(sizeof(*cur));
*prev = cur;
prev = &cur->next;
r = full_read(fd, cur->data, 512);
r = full_read(fd, cur->data, TAR_BLOCK_SIZE);
if (r > 0)
size += r;
} while (r == 512);
} while (r == TAR_BLOCK_SIZE);
/* write archive header */
fstat(fd, &s);
@ -106,8 +83,8 @@ static void archivefile(const char *path)
writeheader(path, &s, '0');
/* dump file contents */
for (cur = start; (int)size > 0; size -= 512) {
xwrite(STDOUT_FILENO, cur->data, 512);
for (cur = start; (int)size > 0; size -= TAR_BLOCK_SIZE) {
xwrite(STDOUT_FILENO, cur->data, TAR_BLOCK_SIZE);
start = cur;
cur = cur->next;
free(start);