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-rw-r--r--lib/util/charset/iconv.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/lib/util/charset/iconv.c b/lib/util/charset/iconv.c
index a01b6a5787..10b3a6488b 100644
--- a/lib/util/charset/iconv.c
+++ b/lib/util/charset/iconv.c
@@ -51,6 +51,7 @@ static size_t ascii_pull (void *,const char **, size_t *, char **, size_t *);
static size_t ascii_push (void *,const char **, size_t *, char **, size_t *);
static size_t utf8_pull (void *,const char **, size_t *, char **, size_t *);
static size_t utf8_push (void *,const char **, size_t *, char **, size_t *);
+static size_t utf8_munged_push(void *,const char **, size_t *, char **, size_t *);
static size_t ucs2hex_pull(void *,const char **, size_t *, char **, size_t *);
static size_t ucs2hex_push(void *,const char **, size_t *, char **, size_t *);
static size_t iconv_copy (void *,const char **, size_t *, char **, size_t *);
@@ -66,6 +67,10 @@ static const struct charset_functions builtin_functions[] = {
/* we include the UTF-8 alias to cope with differing locale settings */
{"UTF8", utf8_pull, utf8_push},
{"UTF-8", utf8_pull, utf8_push},
+
+ /* this handles the munging needed for String2Key */
+ {"UTF8_MUNGED", utf8_pull, utf8_munged_push},
+
{"ASCII", ascii_pull, ascii_push},
{"UCS2-HEX", ucs2hex_pull, ucs2hex_push}
};
@@ -707,4 +712,131 @@ error:
}
+/*
+ this takes a UTF16 sequence, munges it according to the string2key
+ rules, and produces a UTF8 sequence
+
+The rules are:
+
+ 1) convert any instance of 0xD800 - 0xDBFF (high surrogate)
+ without an immediately following 0xDC00 - 0x0xDFFF (low surrogate) to
+ U+FFFD (OBJECT REPLACEMENT CHARACTER).
+
+ 2) the same for any low surrogate that was not preceded by a high surrogate.
+ */
+static size_t utf8_munged_push(void *cd, const char **inbuf, size_t *inbytesleft,
+ char **outbuf, size_t *outbytesleft)
+{
+ size_t in_left=*inbytesleft, out_left=*outbytesleft;
+ uint8_t *c = (uint8_t *)*outbuf;
+ const uint8_t *uc = (const uint8_t *)*inbuf;
+
+ while (in_left >= 2 && out_left >= 1) {
+ unsigned int codepoint;
+
+ if (uc[1] == 0 && !(uc[0] & 0x80)) {
+ /* simplest case */
+ c[0] = uc[0];
+ in_left -= 2;
+ out_left -= 1;
+ uc += 2;
+ c += 1;
+ continue;
+ }
+
+ if ((uc[1]&0xf8) == 0) {
+ /* next simplest case */
+ if (out_left < 2) {
+ errno = E2BIG;
+ goto error;
+ }
+ c[0] = 0xc0 | (uc[0]>>6) | (uc[1]<<2);
+ c[1] = 0x80 | (uc[0] & 0x3f);
+ in_left -= 2;
+ out_left -= 2;
+ uc += 2;
+ c += 2;
+ continue;
+ }
+
+ if ((uc[1] & 0xfc) == 0xdc) {
+ /* low surrogate not preceded by high surrogate
+ convert to 0xfffd */
+ codepoint = 0xfffd;
+ goto codepoint16;
+ }
+
+ if ((uc[1] & 0xfc) != 0xd8) {
+ codepoint = uc[0] | (uc[1]<<8);
+ goto codepoint16;
+ }
+
+ /* its the first part of a 4 byte sequence */
+ if (in_left < 4 || (uc[3] & 0xfc) != 0xdc) {
+ /* high surrogate not followed by low surrogate
+ convert to 0xfffd */
+ codepoint = 0xfffd;
+ goto codepoint16;
+ }
+
+ codepoint = 0x10000 + (uc[2] | ((uc[3] & 0x3)<<8) |
+ (uc[0]<<10) | ((uc[1] & 0x3)<<18));
+
+ if (out_left < 4) {
+ errno = E2BIG;
+ goto error;
+ }
+ c[0] = 0xf0 | (codepoint >> 18);
+ c[1] = 0x80 | ((codepoint >> 12) & 0x3f);
+ c[2] = 0x80 | ((codepoint >> 6) & 0x3f);
+ c[3] = 0x80 | (codepoint & 0x3f);
+
+ in_left -= 4;
+ out_left -= 4;
+ uc += 4;
+ c += 4;
+ continue;
+
+ codepoint16:
+ if (out_left < 3) {
+ errno = E2BIG;
+ goto error;
+ }
+ c[0] = 0xe0 | (codepoint >> 12);
+ c[1] = 0x80 | ((codepoint >> 6) & 0x3f);
+ c[2] = 0x80 | (codepoint & 0x3f);
+
+ in_left -= 2;
+ out_left -= 3;
+ uc += 2;
+ c += 3;
+ continue;
+ }
+
+ if (in_left == 1) {
+ errno = EINVAL;
+ goto error;
+ }
+
+ if (in_left > 1) {
+ errno = E2BIG;
+ goto error;
+ }
+
+ *inbytesleft = in_left;
+ *outbytesleft = out_left;
+ *inbuf = (const char *)uc;
+ *outbuf = (char *)c;
+
+ return 0;
+
+error:
+ *inbytesleft = in_left;
+ *outbytesleft = out_left;
+ *inbuf = (const char *)uc;
+ *outbuf = (char *)c;
+ return -1;
+}
+
+