aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/beam/erl_unicode.c
diff options
context:
space:
mode:
Diffstat (limited to 'erts/emulator/beam/erl_unicode.c')
-rw-r--r--erts/emulator/beam/erl_unicode.c174
1 files changed, 78 insertions, 96 deletions
diff --git a/erts/emulator/beam/erl_unicode.c b/erts/emulator/beam/erl_unicode.c
index 51559aea1c..e24b6f1458 100644
--- a/erts/emulator/beam/erl_unicode.c
+++ b/erts/emulator/beam/erl_unicode.c
@@ -1155,7 +1155,7 @@ BIF_RETTYPE unicode_characters_to_list_2(BIF_ALIST_2)
* a faster analyze and size count with this function.
*/
int erts_analyze_utf8(byte *source, Uint size,
- byte **err_pos, Uint *num_chars, int *left)
+ byte **err_pos, Uint *num_chars, int *left)
{
*err_pos = source;
*num_chars = 0;
@@ -1210,7 +1210,7 @@ int erts_analyze_utf8(byte *source, Uint size,
}
++(*num_chars);
*err_pos = source;
- if (left && --(*left) <= 0) {
+ if (left && --(*left) <= 0 && size) {
return ERTS_UTF8_ANALYZE_MORE;
}
}
@@ -1220,7 +1220,7 @@ int erts_analyze_utf8(byte *source, Uint size,
/*
* No errors should be able to occur - no overlongs, no malformed, no nothing
*/
-static Eterm do_utf8_to_list(Process *p, Uint num, byte *bytes, Uint sz,
+Eterm do_utf8_to_list(Process *p, Uint num, byte *bytes, Uint sz,
Uint left,
Uint *num_built, Uint *num_eaten, Eterm tail)
{
@@ -1812,31 +1812,36 @@ BIF_RETTYPE atom_to_binary_2(BIF_ALIST_2)
ap = atom_tab(atom_val(BIF_ARG_1));
if (BIF_ARG_2 == am_latin1) {
- BIF_RET(new_binary(BIF_P, ap->name, ap->len));
- } else if (BIF_ARG_2 == am_utf8 || BIF_ARG_2 == am_unicode) {
- int bin_size = 0;
int i;
Eterm bin_term;
- byte* bin_p;
-
- for (i = 0; i < ap->len; i++) {
- bin_size += (ap->name[i] >= 0x80) ? 2 : 1;
+ int bin_size = ap->len;
+
+ for (i = 0; i < ap->len; ) {
+ if (ap->name[i] < 0x80) i++;
+ else {
+ ASSERT(ap->name[i] >= 0xC0);
+ if (ap->name[i] < 0xE0) {
+ ASSERT(i+1 < ap->len && (ap->name[i+1] & 0xC0) == 0x80);
+ i += 2;
+ bin_size -= 1;
+ }
+ else goto error;
+ }
}
if (bin_size == ap->len) {
- BIF_RET(new_binary(BIF_P, ap->name, ap->len));
+ bin_term = new_binary(BIF_P, ap->name, ap->len);
}
- bin_term = new_binary(BIF_P, 0, bin_size);
- bin_p = binary_bytes(bin_term);
- for (i = 0; i < ap->len; i++) {
- byte b = ap->name[i];
- if (b < 0x80) {
- *bin_p++ = b;
- } else {
- *bin_p++ = 0xC0 | (b >> 6);
- *bin_p++ = 0x80 | (b & 0x3F);
- }
+ else {
+ byte* bin_p;
+ int dbg_sz;
+ bin_term = new_binary(BIF_P, 0, bin_size);
+ bin_p = binary_bytes(bin_term);
+ dbg_sz = erts_utf8_to_latin1(bin_p, ap->name, ap->len);
+ ASSERT(dbg_sz == bin_size); (void)dbg_sz;
}
BIF_RET(bin_term);
+ } else if (BIF_ARG_2 == am_utf8 || BIF_ARG_2 == am_unicode) {
+ BIF_RET(new_binary(BIF_P, ap->name, ap->len));
} else {
error:
BIF_ERROR(BIF_P, BADARG);
@@ -1856,102 +1861,52 @@ binary_to_atom(Process* p, Eterm bin, Eterm enc, int must_exist)
bin_size = binary_size(bin);
if (enc == am_latin1) {
Eterm a;
- if (bin_size > MAX_ATOM_LENGTH) {
+ if (bin_size > MAX_ATOM_CHARACTERS) {
system_limit:
erts_free_aligned_binary_bytes(temp_alloc);
BIF_ERROR(p, SYSTEM_LIMIT);
}
if (!must_exist) {
- a = am_atom_put((char *)bytes, bin_size);
+ a = am_atom_put2(bytes, bin_size, 1);
erts_free_aligned_binary_bytes(temp_alloc);
BIF_RET(a);
- } else if (erts_atom_get((char *)bytes, bin_size, &a)) {
+ } else if (erts_atom_get((char *)bytes, bin_size, &a, 1)) {
erts_free_aligned_binary_bytes(temp_alloc);
BIF_RET(a);
} else {
goto badarg;
}
} else if (enc == am_utf8 || enc == am_unicode) {
- char *buf;
- char *dst;
- int i;
- int num_chars;
Eterm res;
+ Uint num_chars = 0;
+ const byte* p = bytes;
+ Uint left = bin_size;
- if (bin_size > 2*MAX_ATOM_LENGTH) {
- byte* err_pos;
- Uint n;
- int reds_left = bin_size+1; /* Number of reductions left. */
-
- if (erts_analyze_utf8(bytes, bin_size, &err_pos,
- &n, &reds_left) == ERTS_UTF8_OK) {
- /*
- * Correct UTF-8 encoding, but too many characters to
- * fit in an atom.
- */
+ while (left) {
+ if (++num_chars > MAX_ATOM_CHARACTERS) {
goto system_limit;
- } else {
- /*
- * Something wrong in the UTF-8 encoding or Unicode code
- * points > 255.
- */
- goto badarg;
}
- }
-
- /*
- * Allocate a temporary buffer the same size as the binary,
- * so that we don't need an extra overflow test.
- */
- buf = (char *) erts_alloc(ERTS_ALC_T_TMP, bin_size);
- dst = buf;
- for (i = 0; i < bin_size; i++) {
- int c = bytes[i];
- if (c < 0x80) {
- *dst++ = c;
- } else if (i < bin_size-1) {
- int c2;
- if ((c & 0xE0) != 0xC0) {
- goto free_badarg;
- }
- i++;
- c = (c & 0x3F) << 6;
- c2 = bytes[i];
- if ((c2 & 0xC0) != 0x80) {
- goto free_badarg;
- }
- c = c | (c2 & 0x3F);
- if (0x80 <= c && c < 256) {
- *dst++ = c;
- } else {
- goto free_badarg;
- }
- } else {
- free_badarg:
- erts_free(ERTS_ALC_T_TMP, (void *) buf);
- goto badarg;
+ if ((p[0] & 0x80) == 0) {
+ ++p;
+ --left;
}
+ else if (left >= 2
+ && (p[0] & 0xFE) == 0xC2 /* only allow latin1 subset */
+ && (p[1] & 0xC0) == 0x80) {
+ p += 2;
+ left -= 2;
+ }
+ else goto badarg;
}
- num_chars = dst - buf;
- if (num_chars > MAX_ATOM_LENGTH) {
- erts_free(ERTS_ALC_T_TMP, (void *) buf);
- goto system_limit;
- }
+
if (!must_exist) {
- res = am_atom_put(buf, num_chars);
- erts_free(ERTS_ALC_T_TMP, (void *) buf);
- erts_free_aligned_binary_bytes(temp_alloc);
- BIF_RET(res);
- } else {
- int exists = erts_atom_get(buf, num_chars, &res);
- erts_free(ERTS_ALC_T_TMP, (void *) buf);
- if (exists) {
- erts_free_aligned_binary_bytes(temp_alloc);
- BIF_RET(res);
- } else {
- goto badarg;
- }
+ res = am_atom_put((char*)bytes, bin_size);
+ }
+ else if (!erts_atom_get((char*)bytes, bin_size, &res, 0)) {
+ goto badarg;
}
+ erts_free_aligned_binary_bytes(temp_alloc);
+ BIF_RET(res);
} else {
badarg:
erts_free_aligned_binary_bytes(temp_alloc);
@@ -2670,3 +2625,30 @@ BIF_RETTYPE file_native_name_encoding_0(BIF_ALIST_0)
}
}
+/* Assumes 'dest' has enough room.
+ */
+int erts_utf8_to_latin1(byte* dest, const byte* source, unsigned slen)
+{
+ byte* dp = dest;
+ while (slen > 0) {
+ if ((source[0] & 0x80) == 0) {
+ *dp++ = *source++;
+ --slen;
+ }
+ else if (slen > 1 &&
+ (source[0] & 0xFE) == 0xC2 &&
+ (source[1] & 0xC0) == 0x80) {
+ *dp++ = (char) ((source[0] << 6) | (source[1] & 0x3F));
+ source += 2;
+ slen -= 2;
+ }
+ else {
+ /* Just let unconvertable octets through. This should not happen
+ in a correctly upgraded system */
+ *dp++ = *source++;
+ --slen;
+ }
+ }
+ return dp - dest;
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 08:32:22 +0000