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authorSverker Eriksson <[email protected]>2013-01-11 17:27:29 +0100
committerSverker Eriksson <[email protected]>2013-01-18 15:04:03 +0100
commitb553664f54034e8c04ae6f9cc44f16b7f516518b (patch)
tree1522c655fea9aa52476e997aa26f1512d3ecada4 /lib/erl_interface/src/decode/decode_atom.c
parent97abb095cd2182d5c3fafd525da4943ef74dc8e5 (diff)
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erl_interface: utf8 atoms continued
Diffstat (limited to 'lib/erl_interface/src/decode/decode_atom.c')
-rw-r--r--lib/erl_interface/src/decode/decode_atom.c185
1 files changed, 132 insertions, 53 deletions
diff --git a/lib/erl_interface/src/decode/decode_atom.c b/lib/erl_interface/src/decode/decode_atom.c
index 84edf1766a..2ada418243 100644
--- a/lib/erl_interface/src/decode/decode_atom.c
+++ b/lib/erl_interface/src/decode/decode_atom.c
@@ -21,76 +21,155 @@
#include "eiext.h"
#include "putget.h"
-static int utf8_to_latin1(char* dest, const char* source, unsigned len);
int ei_decode_atom(const char *buf, int *index, char *p)
{
- const char *s = buf + *index;
- const char *s0 = s;
- int len;
-
- switch (get8(s)) {
- case ERL_ATOM_EXT:
- len = get16be(s);
- if (len > MAXATOMLEN) return -1;
- if (p) {
- memmove(p,s,len);
- p[len] = (char)0;
- }
- break;
-
- case ERL_SMALL_ATOM_EXT:
- len = get8(s);
- if (p) {
- memmove(p,s,len);
- p[len] = (char)0;
- }
- break;
-
- case ERL_UNICODE_ATOM_EXT:
- len = get16be(s);
-
- if (len > 2*MAXATOMLEN) return -1;
-
- if (p && utf8_to_latin1(p, s, len) < 0) return -1;
- break;
-
- default:
- return -1;
- }
-
- s += len;
- *index += s-s0;
- return 0;
+ return ei_decode_atom_as(buf, index, p, MAXATOMLEN, ERLANG_LATIN1, NULL, NULL);
}
-int ei_internal_get_atom(const char** bufp, char* p)
+int ei_decode_atom_as(const char *buf, int *index, char* p, int destlen,
+ enum erlang_char_encoding want_enc,
+ enum erlang_char_encoding* was_encp,
+ enum erlang_char_encoding* res_encp)
{
- int ix = 0;
- if (ei_decode_atom(*bufp, &ix, p) < 0) return -1;
- *bufp += ix;
+ const char *s = buf + *index;
+ const char *s0 = s;
+ int len;
+ enum erlang_char_encoding got_enc;
+
+ switch (get8(s)) {
+ case ERL_ATOM_EXT:
+ len = get16be(s);
+ got_enc = ERLANG_LATIN1;
+ break;
+ case ERL_SMALL_ATOM_EXT:
+ len = get8(s);
+ got_enc = ERLANG_LATIN1;
+ break;
+ case ERL_ATOM_UTF8_EXT:
+ len = get16be(s);
+ got_enc = ERLANG_UTF8;
+ break;
+ case ERL_SMALL_ATOM_UTF8_EXT:
+ len = get8(s);
+ got_enc = ERLANG_UTF8;
+ break;
+ default:
+ return -1;
+ }
+
+ if (want_enc == got_enc || want_enc == ERLANG_WHATEVER || want_enc == ERLANG_ASCII) {
+ int i, found_non_ascii = 0;
+ if (len >= destlen)
+ return -1;
+ for (i=0; i<len; i++) {
+ if (s[i] & 0x80) found_non_ascii = 1;
+ if (p) p[i] = s[i];
+ }
+ if (p) p[len] = 0;
+ if (want_enc == ERLANG_ASCII && found_non_ascii) {
+ return -1;
+ }
+ if (res_encp) {
+ *res_encp = found_non_ascii ? got_enc : ERLANG_ASCII;
+ }
+ }
+ else {
+ int plen = (got_enc == ERLANG_LATIN1) ?
+ utf8_to_latin1(p, s, len, destlen-1, res_encp) :
+ latin1_to_utf8(p, s, len, destlen-1, res_encp);
+ if (plen < 0) return -1;
+ if (p) p[plen] = 0;
+ }
+ if (was_encp) {
+ *was_encp = got_enc;
+ }
+
+ s += len;
+ *index += s-s0;
return 0;
-}
+}
+
-static int utf8_to_latin1(char* dest, const char* source, unsigned slen)
+int utf8_to_latin1(char* dst, const char* src, int slen, int destlen,
+ enum erlang_char_encoding* res_encp)
{
- const char* dest_end = dest + MAXATOMLEN - 1;
+ const char* const dst_start = dst;
+ const char* const dst_end = dst + destlen;
+ int found_non_ascii = 0;
- while (slen > 0 && dest < dest_end) {
- if ((source[0] & 0x80) == 0) {
- *dest++ = *source++;
+ while (slen > 0) {
+ if (dst >= dst_end) return -1;
+ if ((src[0] & 0x80) == 0) {
+ if (dst_start) {
+ *dst = *src;
+ }
+ ++dst;
+ ++src;
--slen;
}
else if (slen > 1 &&
- (source[0] & 0xFE) == 0xC2 &&
- (source[1] & 0xC0) == 0x80) {
- *dest++ = (char) ((source[0] << 6) | (source[1] & 0x3F));
- source += 2;
+ (src[0] & 0xFE) == 0xC2 &&
+ (src[1] & 0xC0) == 0x80) {
+ if (dst_start) {
+ *dst = (char) ((src[0] << 6) | (src[1] & 0x3F));
+ }
+ ++dst;
+ src += 2;
slen -= 2;
+ found_non_ascii = 1;
}
else return -1;
}
- *dest = 0;
+ if (res_encp) {
+ *res_encp = found_non_ascii ? ERLANG_LATIN1 : ERLANG_ASCII;
+ }
+ return dst - dst_start;
+}
+
+int latin1_to_utf8(char* dst, const char* src, int slen, int destlen,
+ enum erlang_char_encoding* res_encp)
+{
+ const char* const src_end = src + slen;
+ const char* const dst_start = dst;
+ const char* const dst_end = dst + destlen;
+ int found_non_ascii = 0;
+
+ while (src < src_end) {
+ if (dst >= dst_end) return -1;
+ if ((src[0] & 0x80) == 0) {
+ if (dst_start) {
+ *dst = *src;
+ }
+ ++dst;
+ }
+ else {
+ if (dst_start) {
+ unsigned char ch = *src;
+ dst[0] = 0xC0 | (ch >> 6);
+ dst[1] = 0x80 | (ch & 0x3F);
+ }
+ dst += 2;
+ found_non_ascii = 1;
+ }
+ ++src;
+ }
+ if (res_encp) {
+ *res_encp = found_non_ascii ? ERLANG_UTF8 : ERLANG_ASCII;
+ }
+ return dst - dst_start;
+}
+
+
+
+int ei_internal_get_atom(const char** bufp, char* p,
+ enum erlang_char_encoding* was_encp)
+{
+ int ix = 0;
+ if (ei_decode_atom_as(*bufp, &ix, p, MAXATOMLEN_UTF8, ERLANG_UTF8, was_encp, NULL) < 0)
+ return -1;
+ *bufp += ix;
return 0;
}
+