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base32: new applet

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function                                             old     new   delta
baseNUM_main                                           -     568    +568
decode_base32                                          -     275    +275
bb_uuenc_tbl_base32                                    -      34     +34
read_base64                                          218     236     +18
applet_names                                        2732    2739      +7
applet_main                                         1580    1584      +4
packed_usage                                       33480   33478      -2
base64_main                                          208       -    -208
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 3/1 up/down: 906/-210)          Total: 696 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2020-11-25 22:47:00 +01:00
parent 03eb6eba43
commit 20900489a1
3 changed files with 192 additions and 13 deletions
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118
coreutils/uudecode.c
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@ -168,9 +168,11 @@ int uudecode_main(int argc UNUSED_PARAM, char **argv)
}
#endif
//applet:IF_BASE64(APPLET(base64, BB_DIR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_BASE64) += uudecode.o
//config:config BASE32
//config: bool "base32 (4.9 kb)"
//config: default y
//config: help
//config: Base32 encode and decode
//config:config BASE64
//config: bool "base64 (4.9 kb)"
@ -178,6 +180,14 @@ int uudecode_main(int argc UNUSED_PARAM, char **argv)
//config: help
//config: Base64 encode and decode
//usage:#define base32_trivial_usage
//usage: "[-d] [FILE]"
//usage:#define base32_full_usage "\n\n"
//usage: "Base32 encode or decode FILE to standard output"
//usage: "\n -d Decode data"
////usage: "\n -w COL Wrap lines at COL (default 76, 0 disables)"
////usage: "\n -i When decoding, ignore non-alphabet characters"
//usage:#define base64_trivial_usage
//usage: "[-d] [FILE]"
//usage:#define base64_full_usage "\n\n"
@ -186,9 +196,77 @@ int uudecode_main(int argc UNUSED_PARAM, char **argv)
////usage: "\n -w COL Wrap lines at COL (default 76, 0 disables)"
////usage: "\n -i When decoding, ignore non-alphabet characters"
#if ENABLE_BASE64
int base64_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int base64_main(int argc UNUSED_PARAM, char **argv)
// APPLET_ODDNAME:name main location suid_type help
//applet:IF_BASE32(APPLET_ODDNAME(base32, baseNUM, BB_DIR_BIN, BB_SUID_DROP, base32))
//applet:IF_BASE64(APPLET_ODDNAME(base64, baseNUM, BB_DIR_BIN, BB_SUID_DROP, base64))
//kbuild:lib-$(CONFIG_BASE64) += uudecode.o
//kbuild:lib-$(CONFIG_BASE32) += uudecode.o
#if ENABLE_BASE32 || ENABLE_BASE64
# if ENABLE_BASE32
static void bb_b32encode(char *p, const void *src, int length)
{
#define tbl bb_uuenc_tbl_base32
const unsigned char *s = src;
/* Transform 5x8 bits to 8x5 bits */
while (length > 0) {
unsigned cur, next;
length--;
cur = *s++;
*p++ = tbl[cur >> 3]; // xxxxx--- -------- -------- -------- --------
cur &= 7;
next = 0;
if (--length >= 0)
next = *s++;
*p++ = tbl[(cur << 2) + (next >> 6)]; // -----xxx xx------ -------- -------- --------
cur = next & 0x3f;
*p++ = tbl[cur >> 1]; // -------- --xxxxx- -------- -------- --------
cur &= 1;
next = 0;
if (--length >= 0)
next = *s++;
*p++ = tbl[(cur << 4) + (next >> 4)]; // -------- -------x xxxx---- -------- --------
cur = next & 0xf;
next = 0;
if (--length >= 0)
next = *s++;
*p++ = tbl[(cur << 1) + (next >> 7)]; // -------- -------- ----xxxx x------- --------
cur = next & 0x7f;
*p++ = tbl[cur >> 2]; // -------- -------- -------- -xxxxx-- --------
cur &= 3;
next = 0;
if (--length >= 0)
next = *s++;
*p++ = tbl[(cur << 3) + (next >> 5)]; // -------- -------- -------- ------xx xxx-----
cur = next & 0x1f;
*p++ = tbl[cur]; // -------- -------- -------- -------- ---xxxxx
}
#undef tbl
/* Zero-terminate */
*p = '\0';
/* Pad as necessary */
length = ((-length) * 3) >> 1; /* -4 => 6 pad chars, -3 => 4, -2 => 3, -1 => 1 */
while (length--) {
*--p = '=';
}
}
# else
void bb_b32encode(char *p, const void *src, int length); /* undefined */
# endif
int baseNUM_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int baseNUM_main(int argc UNUSED_PARAM, char **argv)
{
FILE *src_stream;
unsigned opts;
@ -200,7 +278,10 @@ int base64_main(int argc UNUSED_PARAM, char **argv)
*--argv = (char*)"-";
src_stream = xfopen_stdin(argv[0]);
if (opts) {
read_base64(src_stream, stdout, /*flags:*/ (unsigned char)EOF);
int flags = (unsigned char)EOF;
if (ENABLE_BASE32 && (!ENABLE_BASE64 || applet_name[4] == '3'))
flags = ((unsigned char)EOF) | BASE64_32;
read_base64(src_stream, stdout, flags);
} else {
enum {
SRC_BUF_SIZE = 76 / 4 * 3, /* this *MUST* be a multiple of 3 */
@ -210,14 +291,31 @@ int base64_main(int argc UNUSED_PARAM, char **argv)
char dst_buf[DST_BUF_SIZE + 1];
int src_fd = fileno(src_stream);
while (1) {
size_t size = full_read(src_fd, src_buf, SRC_BUF_SIZE);
size_t size;
if (ENABLE_BASE32 && (!ENABLE_BASE64 || applet_name[4] == '3'))
size = 72 / 8 * 5;
//FIXME: wrong, default width of base32 is not 72, but 76 chars
//(not a multiple of 8 - requires adding wrapping logic)
//when this is fixed, can implement -w COL too
else
size = SRC_BUF_SIZE;
size = full_read(src_fd, src_buf, size);
if (!size)
break;
if ((ssize_t)size < 0)
bb_simple_perror_msg_and_die(bb_msg_read_error);
/* Encode the buffer we just read in */
bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3));
if (ENABLE_BASE32 && (!ENABLE_BASE64 || applet_name[4] == '3')) {
bb_b32encode(dst_buf, src_buf, size);
size = 8 * ((size + 4) / 5);
} else {
bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
size = 4 * ((size + 2) / 3);
}
xwrite(STDOUT_FILENO, dst_buf, size);
bb_putchar('\n');
fflush(stdout);
}