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#include <gu/assert.h>
#include <gu/utf8.h>
#include "config.h"
GuUCS
gu_utf8_decode(const uint8_t** src_inout)
{
const uint8_t* src = *src_inout;
uint8_t c = src[0];
if (c < 0x80) {
*src_inout = src + 1;
return (GuUCS) c;
}
size_t len = (c < 0xe0 ? 1 :
c < 0xf0 ? 2 :
3);
uint32_t mask = 0x07071f7f;
uint32_t u = c & (mask >> (len * 8));
for (size_t i = 1; i <= len; i++) {
c = src[i];
u = u << 6 | (c & 0x3f);
}
*src_inout = &src[len + 1];
return (GuUCS) u;
}
GuUCS
gu_in_utf8_(GuIn* in, GuExn* err)
{
uint8_t c = gu_in_u8(in, err);
if (!gu_ok(err)) {
return 0;
}
int len = (c < 0x80 ? 0 :
c < 0xc2 ? -1 :
c < 0xe0 ? 1 :
c < 0xf0 ? 2 :
c < 0xf5 ? 3 :
-1);
if (len < 0) {
goto fail;
} else if (len == 0) {
return c;
}
static const uint8_t mask[4] = { 0x7f, 0x1f, 0x0f, 0x07 };
uint32_t u = c & mask[len];
uint8_t buf[3];
// If reading the extra bytes causes EOF, it is an encoding
// error, not a legitimate end of character stream.
GuExn* tmp_err = gu_exn(err, GuEOF, NULL);
gu_in_bytes(in, buf, len, tmp_err);
if (tmp_err->caught) {
goto fail;
}
if (!gu_ok(err)) {
return 0;
}
for (int i = 0; i < len; i++) {
c = buf[i];
if ((c & 0xc0) != 0x80) {
goto fail;
}
u = u << 6 | (c & 0x3f);
}
GuUCS ucs = (GuUCS) u;
if (!gu_ucs_valid(ucs)) {
goto fail;
}
return ucs;
fail:
gu_raise(err, GuUCSExn);
return 0;
}
size_t
gu_advance_utf8(GuUCS ucs, uint8_t* buf)
{
gu_require(gu_ucs_valid(ucs));
if (ucs < 0x80) {
buf[0] = (uint8_t) ucs;
return 1;
} else if (ucs < 0x800) {
buf[0] = 0xc0 | (ucs >> 6);
buf[1] = 0x80 | (ucs & 0x3f);
return 2;
} else if (ucs < 0x10000) {
buf[0] = 0xe0 | (ucs >> 12);
buf[1] = 0x80 | ((ucs >> 6) & 0x3f);
buf[2] = 0x80 | (ucs & 0x3f);
return 3;
} else {
buf[0] = 0xf0 | (ucs >> 18);
buf[1] = 0x80 | ((ucs >> 12) & 0x3f);
buf[2] = 0x80 | ((ucs >> 6) & 0x3f);
buf[3] = 0x80 | (ucs & 0x3f);
return 4;
}
}
char
gu_in_utf8_char_(GuIn* in, GuExn* err)
{
return gu_ucs_char(gu_in_utf8(in, err), err);
}
char
gu_in_utf8_char(GuIn* in, GuExn* err)
{
#ifdef CHAR_ASCII
int i = gu_in_peek_u8(in);
if (i >= 0 && i < 0x80) {
gu_in_consume(in, 1);
return (char) i;
}
#endif
return gu_in_utf8_char_(in, err);
}
void
gu_out_utf8_long_(GuUCS ucs, GuOut* out, GuExn* err)
{
uint8_t buf[4];
size_t sz = gu_advance_utf8(ucs, buf);
switch (sz) {
case 2:
gu_out_bytes(out, buf, 2, err);
break;
case 3:
gu_out_bytes(out, buf, 3, err);
break;
case 4:
gu_out_bytes(out, buf, 4, err);
break;
default:
gu_impossible();
}
}
extern inline void
gu_out_utf8(GuUCS ucs, GuOut* out, GuExn* err);
static size_t
gu_utf32_out_utf8_buffered_(const GuUCS* src, size_t len, GuOut* out,
GuExn* err)
{
size_t src_i = 0;
while (src_i < len) {
size_t dst_sz;
uint8_t* dst = gu_out_begin_span(out, len - src_i, &dst_sz, err);
if (!gu_ok(err)) {
return src_i;
}
if (!dst) {
gu_out_utf8(src[src_i], out, err);
if (!gu_ok(err)) {
return src_i;
}
src_i++;
break;
}
size_t dst_i = 0;
while (true) {
size_t safe = (dst_sz - dst_i) / 4;
size_t end = GU_MIN(len, src_i + safe);
if (end == src_i) {
break;
}
do {
GuUCS ucs = src[src_i++];
dst_i += gu_advance_utf8(ucs, &dst[dst_i]);
} while (src_i < end);
}
gu_out_end_span(out, dst_i);
}
return src_i;
}
size_t
gu_utf32_out_utf8(const GuUCS* src, size_t len, GuOut* out, GuExn* err)
{
if (gu_out_is_buffered(out)) {
return gu_utf32_out_utf8_buffered_(src, len, out, err);
}
for (size_t i = 0; i < len; i++) {
gu_out_utf8(src[i], out, err);
if (!gu_ok(err)) {
return i;
}
}
return len;
}
#ifndef CHAR_ASCII
void gu_str_out_utf8_(const char* str, GuOut* out, GuExn* err)
{
size_t len = strlen(str);
size_t sz = 0;
uint8_t* buf = gu_out_begin_span(out, len, &sz, err);
if (!gu_ok(err)) {
return;
}
if (buf != NULL && sz < len) {
gu_out_end_span(out, 0);
buf = NULL;
}
GuPool* tmp_pool = buf ? NULL : gu_local_pool();
buf = buf ? buf : gu_new_n(uint8_t, len, tmp_pool);
for (size_t i = 0; i < len; i++) {
GuUCS ucs = gu_char_ucs(str[i]);
buf[i] = (uint8_t) ucs;
}
if (tmp_pool) {
gu_out_bytes(out, buf, len, err);
gu_pool_free(tmp_pool);
} else {
gu_out_end_span(out, len);
}
}
#endif
extern inline GuUCS
gu_in_utf8(GuIn* in, GuExn* err);
void
gu_str_out_utf8(const char* str, GuOut* out, GuExn* err)
{
#ifdef CHAR_ASCII
gu_out_bytes(out, (const uint8_t*) str, strlen(str), err);
#else
extern void
gu_str_out_utf8_(const char* str, GuOut* out, GuExn* err);
gu_str_out_utf8_(str, out, err);
#endif
}
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