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-rw-r--r--lib/erl_interface/src/encode/encode_atom.c154
1 files changed, 144 insertions, 10 deletions
diff --git a/lib/erl_interface/src/encode/encode_atom.c b/lib/erl_interface/src/encode/encode_atom.c
index 6f41f045e0..044f17cb60 100644
--- a/lib/erl_interface/src/encode/encode_atom.c
+++ b/lib/erl_interface/src/encode/encode_atom.c
@@ -22,29 +22,108 @@
#include "eiext.h"
#include "putget.h"
+
+static int copy_ascii_atom(char* dst, const char* src, int slen);
+static int copy_utf8_atom(char* dst, const char* src, int slen);
+
+
int ei_encode_atom(char *buf, int *index, const char *p)
{
size_t len = strlen(p);
- if (len >= INT_MAX) return -1;
- return ei_encode_atom_len(buf, index, p, len);
+ if (len >= MAXATOMLEN)
+ len = MAXATOMLEN - 1;
+ return ei_encode_atom_len_as(buf, index, p, len, ERLANG_LATIN1, ERLANG_LATIN1);
}
int ei_encode_atom_len(char *buf, int *index, const char *p, int len)
{
+ /* This function is documented to truncate at MAXATOMLEN (256) */
+ if (len >= MAXATOMLEN)
+ len = MAXATOMLEN - 1;
+ return ei_encode_atom_len_as(buf, index, p, len, ERLANG_LATIN1, ERLANG_LATIN1);
+}
+
+int ei_encode_atom_as(char *buf, int *index, const char *p,
+ enum erlang_char_encoding from_enc,
+ enum erlang_char_encoding to_enc)
+{
+ return ei_encode_atom_len_as(buf, index, p, strlen(p), from_enc, to_enc);
+}
+
+int ei_encode_atom_len_as(char *buf, int *index, const char *p, int len,
+ enum erlang_char_encoding from_enc,
+ enum erlang_char_encoding to_enc)
+{
char *s = buf + *index;
char *s0 = s;
+ int offs;
- /* This function is documented to truncate at MAXATOMLEN (256) */
- if (len > MAXATOMLEN)
- len = MAXATOMLEN;
+ if (len >= MAXATOMLEN && (from_enc & (ERLANG_LATIN1|ERLANG_ASCII))) {
+ return -1;
+ }
- if (!buf) s += 3;
- else {
- put8(s,ERL_ATOM_EXT);
- put16be(s,len);
+ switch(to_enc) {
+ case ERLANG_LATIN1:
+ if (buf) {
+ put8(s,ERL_ATOM_EXT);
+ switch (from_enc) {
+ case ERLANG_UTF8:
+ len = utf8_to_latin1(s+2, p, len, MAXATOMLEN-1, NULL);
+ if (len < 0) return -1;
+ break;
+ case ERLANG_ASCII:
+ if (copy_ascii_atom(s+2, p, len) < 0) return -1;
+ break;
+ case ERLANG_LATIN1:
+ memcpy(s+2, p, len);
+ break;
+ default:
+ return -1;
+ }
+ put16be(s,len);
+ }
+ else {
+ s += 3;
+ if (from_enc == ERLANG_UTF8) {
+ len = utf8_to_latin1(NULL, p, len, MAXATOMLEN-1, NULL);
+ if (len < 0) return -1;
+ }
+ }
+ break;
+
+ case ERLANG_UTF8:
+ offs = 1 + 1;
+ switch (from_enc) {
+ case ERLANG_LATIN1:
+ if (len >= 256/2) offs++;
+ len = latin1_to_utf8((buf ? s+offs : NULL), p, len, MAXATOMLEN_UTF8-1, NULL);
+ break;
+ case ERLANG_ASCII:
+ if (buf && copy_ascii_atom(s+offs, p, len) < 0) return -1;
+ break;
+ case ERLANG_UTF8:
+ if (len >= 256) offs++;
+ if (buf && copy_utf8_atom(s+offs, p, len) < 0) return -1;
+ break;
+ default:
+ return -1;
+ }
+ if (buf) {
+ if (offs == 2) {
+ put8(s, ERL_SMALL_ATOM_UTF8_EXT);
+ put8(s, len);
+ }
+ else {
+ put8(s, ERL_ATOM_UTF8_EXT);
+ put16be(s, len);
+ }
+ }
+ else s+= offs;
+ break;
- memmove(s,p,len); /* unterminated string */
+ default:
+ return -1;
}
s += len;
@@ -53,3 +132,58 @@ int ei_encode_atom_len(char *buf, int *index, const char *p, int len)
return 0;
}
+int
+ei_internal_put_atom(char** bufp, const char* p, int slen,
+ enum erlang_char_encoding to_enc)
+{
+ int ix = 0;
+ if (ei_encode_atom_len_as(*bufp, &ix, p, slen, ERLANG_UTF8, to_enc) < 0)
+ return -1;
+ *bufp += ix;
+ return 0;
+}
+
+
+int copy_ascii_atom(char* dst, const char* src, int slen)
+{
+ while (slen > 0) {
+ if ((src[0] & 0x80) != 0) return -1;
+ *dst++ = *src++;
+ slen--;
+ }
+ return 0;
+}
+
+int copy_utf8_atom(char* dst, const char* src, int slen)
+{
+ int num_chars = 0;
+
+ while (slen > 0) {
+ if (++num_chars >= MAXATOMLEN) return -1;
+ if ((src[0] & 0x80) != 0) {
+ if ((src[0] & 0xE0) == 0xC0) {
+ if (slen < 2 || (src[1] & 0xC0) != 0x80) return -1;
+ *dst++ = *src++;
+ slen--;
+ }
+ else if ((src[0] & 0xF0) == 0xE0) {
+ if (slen < 3 || (src[1] & 0xC0) != 0x80 || (src[2] & 0xC0) != 0x80) return -1;
+ *dst++ = *src++;
+ *dst++ = *src++;
+ slen -= 2;
+ }
+ else if ((src[0] & 0xF8) == 0xF0) {
+ if (slen < 4 || (src[1] & 0xC0) != 0x80 || (src[2] & 0xC0) != 0x80 || (src[3] & 0xC0) != 0x80) return -1;
+ *dst++ = *src++;
+ *dst++ = *src++;
+ *dst++ = *src++;
+ slen -= 3;
+ }
+ else return -1;
+ }
+ *dst++ = *src++;
+ slen--;
+ }
+ return 0;
+}
+