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common: Minor change of hex2str to allow for embedded nul.
* common/convert.c (hex2str): Set ERRNO. Return adjusted COUNT.
--
hex2str is only used at one place for in-place converting an hex
encoded passphrase. This change does not affect this use. The change
is however useful to use the function for in-place conversion of
arbitrary hex encoded strings.
Take care for in-place conversion of a hex string encoding binary data
you need to use it this way:
if (hex2str (string, string, strlen (string) + 1, &length)
oops ("probably out of memory but see ERRNO");
for (i=0; i < length; i++)
foo (string[i));
Note that strlen() + 1.
Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
a7264e3a6a
commit
ce11cc39ea
@ -175,21 +175,26 @@ bin2hexcolon (const void *buffer, size_t length, char *stringbuf)
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/* Convert HEXSTRING consisting of hex characters into string and
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store that at BUFFER. HEXSTRING is either delimited by end of
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string or a white space character. The function makes sure that
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the resulting string in BUFFER is terminated by a Nul character.
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the resulting string in BUFFER is terminated by a Nul byte. Note
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that the retruned string may include embedded Nul bytes; the extra
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Nul byte at the end is used to make sure tha the result can always
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be used as a C-string.
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BUFSIZE is the availabe length of BUFFER; if the converted result
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plus a possible required Nul character does not fit into this
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plus a possible required extra Nul character does not fit into this
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buffer, the function returns NULL and won't change the existing
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conent of buffer. In-place conversion is possible as long as
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content of BUFFER. In-place conversion is possible as long as
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BUFFER points to HEXSTRING.
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If BUFFER is NULL and bufsize is 0 the function scans HEXSTRING but
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If BUFFER is NULL and BUFSIZE is 0 the function scans HEXSTRING but
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does not store anything. This may be used to find the end of
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hexstring.
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HEXSTRING.
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On sucess the function returns a pointer to the next character
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after HEXSTRING (which is either end-of-string or a the next white
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space). If BUFLEN is not NULL the strlen of buffer is stored
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there; this will even be done if BUFFER has been passed as NULL. */
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space). If BUFLEN is not NULL the number of valid vytes in BUFFER
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is stored there (an extra Nul byte is not counted); this will even
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be done if BUFFER has been passed as NULL. */
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const char *
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hex2str (const char *hexstring, char *buffer, size_t bufsize, size_t *buflen)
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{
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@ -203,7 +208,10 @@ hex2str (const char *hexstring, char *buffer, size_t bufsize, size_t *buflen)
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for (s=hexstring, count=0; hexdigitp (s) && hexdigitp (s+1); s += 2, count++)
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;
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if (*s && (!isascii (*s) || !isspace (*s)) )
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{
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gpg_err_set_errno (EINVAL);
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return NULL; /* Not followed by Nul or white space. */
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}
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/* We need to append a nul character. However we don't want that if
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the hexstring already ends with "00". */
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need_nul = ((s == hexstring) || !(s[-2] == '0' && s[-1] == '0'));
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@ -213,7 +221,10 @@ hex2str (const char *hexstring, char *buffer, size_t bufsize, size_t *buflen)
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if (buffer)
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{
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if (count > bufsize)
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{
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gpg_err_set_errno (EINVAL);
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return NULL; /* Too long. */
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}
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for (s=hexstring, idx=0; hexdigitp (s) && hexdigitp (s+1); s += 2)
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((unsigned char*)buffer)[idx++] = xtoi_2 (s);
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@ -222,7 +233,7 @@ hex2str (const char *hexstring, char *buffer, size_t bufsize, size_t *buflen)
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}
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if (buflen)
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*buflen = count - 1;
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*buflen = count - need_nul;
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return s;
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}
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@ -242,7 +253,6 @@ hex2str_alloc (const char *hexstring, size_t *r_count)
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{
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if (r_count)
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*r_count = 0;
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gpg_err_set_errno (EINVAL);
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return NULL;
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}
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if (r_count)
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@ -27,7 +27,7 @@
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#define pass() do { ; } while(0)
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#define fail(a) do { fprintf (stderr, "%s:%d: test %d failed\n",\
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__FILE__,__LINE__, (a)); \
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exit (1); \
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/*exit (1)*/; \
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} while(0)
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@ -282,73 +282,74 @@ test_hex2str (void)
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static struct {
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const char *hex;
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const char *str;
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int len; /* Length of STR. This may included embedded nuls. */
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int off;
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int no_alloc_test;
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} tests[] = {
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/* Simple tests. */
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{ "112233445566778899aabbccddeeff1122",
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"\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\x11\x22",
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34 },
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17, 34 },
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{ "112233445566778899aabbccddeeff1122 blah",
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"\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\x11\x22",
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34 },
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17, 34 },
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{ "112233445566778899aabbccddeeff1122\tblah",
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"\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\x11\x22",
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34 },
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17, 34 },
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{ "112233445566778899aabbccddeeff1122\nblah",
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"\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\x11\x22",
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34 },
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17, 34 },
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/* Valid tests yielding an empty string. */
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{ "00",
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"",
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2 },
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1, 2 },
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{ "00 x",
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"",
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2 },
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1, 2 },
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{ "",
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"",
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0 },
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0, 0 },
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{ " ",
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"",
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0 },
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0, 0 },
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/* Test trailing Nul feature. */
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{ "112233445566778899aabbccddeeff112200",
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"\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\x11\x22",
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36 },
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{ "112233445566778899aabbccddeeff112200 ",
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"\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\x11\x22",
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36 },
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{ "112233445566778899aabbccddeeff1100",
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"\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\x11\x00",
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17, 34 },
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{ "112233445566778899aabbccddeeff1100 ",
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"\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff\x11\x00",
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17, 34 },
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/* Test buffer size. (buffer is of length 20) */
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{ "6162636465666768696A6b6c6D6e6f70717273",
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"abcdefghijklmnopqrs",
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38 },
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19, 38 },
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{ "6162636465666768696A6b6c6D6e6f7071727300",
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"abcdefghijklmnopqrs",
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40 },
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20, 40 },
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{ "6162636465666768696A6b6c6D6e6f7071727374",
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NULL,
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0, 1 },
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0, 0, 1 },
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{ "6162636465666768696A6b6c6D6e6f707172737400",
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NULL,
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0, 1 },
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0, 0, 1 },
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{ "6162636465666768696A6b6c6D6e6f707172737475",
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NULL,
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0, 1 },
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0, 0, 1 },
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/* Invalid tests. */
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{ "112233445566778899aabbccddeeff1122334", NULL, 0 },
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{ "112233445566778899AABBCCDDEEFF1122334", NULL, 0 },
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{ "112233445566778899AABBCCDDEEFG11223344", NULL, 0 },
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{ "0:0112233445566778899aabbccddeeff11223344", NULL, 0 },
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{ "112233445566778899aabbccddeeff11223344:", NULL, 0 },
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{ "112233445566778899aabbccddeeff112233445", NULL, 0 },
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{ "112233445566778899aabbccddeeff1122334455", NULL, 0, 1 },
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{ "112233445566778899aabbccddeeff11223344blah", NULL, 0 },
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{ "0", NULL, 0 },
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{ "00:", NULL, 0 },
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{ "00x", NULL, 0 },
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{ "112233445566778899aabbccddeeff1122334", NULL, 0, 0 },
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{ "112233445566778899AABBCCDDEEFF1122334", NULL, 0, 0 },
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{ "112233445566778899AABBCCDDEEFG11223344", NULL, 0, 0 },
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{ "0:0112233445566778899aabbccddeeff11223344", NULL, 0, 0 },
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{ "112233445566778899aabbccddeeff11223344:", NULL, 0, 0 },
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{ "112233445566778899aabbccddeeff112233445", NULL, 0, 0 },
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{ "112233445566778899aabbccddeeff1122334455", NULL, 0, 0, 1 },
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{ "112233445566778899aabbccddeeff11223344blah", NULL, 0, 0 },
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{ "0", NULL, 0, 0 },
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{ "00:", NULL, 0, 0 },
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{ "00x", NULL, 0, 0 },
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{ NULL, NULL, 0 }
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{ NULL, NULL, 0, 0 }
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};
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int idx;
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@ -369,7 +370,7 @@ test_hex2str (void)
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fail (idx);
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else if (tail - tests[idx].hex != tests[idx].off)
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fail (idx);
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else if (strlen (buffer) != count)
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else if (tests[idx].len != count)
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fail (idx);
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}
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else
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@ -400,7 +401,7 @@ test_hex2str (void)
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fail (idx);
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else if (tail - tmpbuf != tests[idx].off)
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fail (idx);
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else if (strlen (tmpbuf) != count)
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else if (tests[idx].len != count)
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fail (idx);
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}
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else
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