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Fallback to malloc from alloca for larger memory chunks 

Fixes #58
Reported-by: https://github.com/daurnimator
This commit is contained in:
Tim Rühsen 2016-09-21 11:54:39 +02:00
parent 1ab7be5641
commit 10f7b5fe7c
1 changed files with 45 additions and 9 deletions
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54
src/psl.c
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@ -524,17 +524,26 @@ static enum punycode_status punycode_encode(
return punycode_success;
}
static ssize_t _utf8_to_utf32(const char *in, size_t inlen, punycode_uint *out, size_t outlen)
static ssize_t _utf8_to_utf32(const char *in, const size_t inlen, punycode_uint *out, size_t outlen)
{
size_t n = 0;
unsigned char *s;
void *m;
if (!outlen)
return -1;
outlen--;
s = alloca(inlen + 1);
if (inlen < 1024) {
s = alloca(inlen + 1);
m = NULL;
} else
s = m = malloc(inlen + 1);
if (!s)
return -1;
memcpy(s, in, inlen);
s[inlen] = 0;
@ -557,10 +566,14 @@ static ssize_t _utf8_to_utf32(const char *in, size_t inlen, punycode_uint *out,
return -1;
out[n++] = ((*s & 0x07) << 18) | ((s[1] & 0x3F) << 12) | ((s[1] & 0x3F) << 6) | (s[2] & 0x3F);
s += 4;
} else
} else {
free(m);
return -1;
}
}
free(m);
return n;
}
@ -1616,10 +1629,21 @@ psl_error_t psl_str_to_utf8lower(const char *str, const char *encoding _UNUSED,
char *utf8_lower;
UConverter *uconv;
/* C89 allocation */
utf16_dst = alloca(sizeof(UChar) * (str_length * 2 + 1));
utf16_lower = alloca(sizeof(UChar) * (str_length * 2 + 1));
utf8_lower = alloca(str_length * 2 + 1);
if (str_length < 256) {
/* C89 allocation */
utf16_dst = alloca(sizeof(UChar) * (str_length * 2 + 1));
utf16_lower = alloca(sizeof(UChar) * (str_length * 2 + 1));
utf8_lower = alloca(str_length * 2 + 1);
} else {
utf16_dst = malloc(sizeof(UChar) * (str_length * 2 + 1));
utf16_lower = malloc(sizeof(UChar) * (str_length * 2 + 1));
utf8_lower = malloc(str_length * 2 + 1);
if (!utf16_dst || !utf16_lower || !utf8_lower) {
ret = PSL_ERR_NO_MEM;
goto out;
}
}
uconv = ucnv_open(encoding, &status);
if (U_SUCCESS(status)) {
@ -1631,8 +1655,14 @@ psl_error_t psl_str_to_utf8lower(const char *str, const char *encoding _UNUSED,
if (U_SUCCESS(status)) {
u_strToUTF8(utf8_lower, str_length * 8 + 1, NULL, utf16_lower, utf16_lower_length, &status);
if (U_SUCCESS(status)) {
if (lower)
*lower = strdup(utf8_lower);
if (lower) {
if (str_length < 256)
*lower = strdup(utf8_lower);
else {
*lower = utf8_lower;
utf8_lower = NULL;
}
}
ret = PSL_SUCCESS;
} else {
ret = PSL_ERR_TO_UTF8;
@ -1650,6 +1680,12 @@ psl_error_t psl_str_to_utf8lower(const char *str, const char *encoding _UNUSED,
ret = PSL_ERR_CONVERTER;
/* fprintf(stderr, "Failed to open converter for '%s' (status %d)\n", encoding, status); */
}
out:
if (str_length >= 256) {
free(utf16_dst);
free(utf16_lower);
free(utf8_lower);
}
} while (0);
#elif defined(WITH_LIBIDN2) || defined(WITH_LIBIDN)
do {