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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#ifndef _NJS_UTF8_H_INCLUDED_
#define _NJS_UTF8_H_INCLUDED_
NJS_EXPORT uint32_t njs_utf8_decode(njs_unicode_decode_t *ctx,
const u_char **data, const u_char *end);
NJS_EXPORT u_char *njs_utf8_encode(u_char *p, uint32_t u);
NJS_EXPORT u_char *njs_utf8_stream_encode(njs_unicode_decode_t *ctx,
const u_char *start, const u_char *end, u_char *dst, njs_bool_t last,
njs_bool_t fatal);
NJS_EXPORT njs_int_t njs_utf8_casecmp(const u_char *start1,
const u_char *start2, size_t len1, size_t len2);
NJS_EXPORT uint32_t njs_utf8_lower_case(const u_char **start,
const u_char *end);
NJS_EXPORT uint32_t njs_utf8_upper_case(const u_char **start,
const u_char *end);
NJS_EXPORT ssize_t njs_utf8_stream_length(njs_unicode_decode_t *ctx,
const u_char *p, size_t len, njs_bool_t last, njs_bool_t fatal,
size_t *out_size);
NJS_EXPORT njs_bool_t njs_utf8_is_valid(const u_char *p, size_t len);
njs_inline uint32_t
njs_utf8_consume(njs_unicode_decode_t *ctx, u_char byte)
{
const u_char *p;
p = &byte;
return njs_utf8_decode(ctx, &p, p + 1);
}
/*
* njs_utf8_next() and njs_utf8_prev() expect a valid UTF-8 string.
*
* The leading UTF-8 byte is either 0xxxxxxx or 11xxxxxx.
* The continuation UTF-8 bytes are 10xxxxxx.
*/
njs_inline const u_char *
njs_utf8_next(const u_char *p, const u_char *end)
{
u_char c;
c = *p++;
if ((c & 0x80) != 0) {
if (njs_slow_path(p >= end)) {
return p;
}
do {
c = *p;
if ((c & 0xC0) != 0x80) {
return p;
}
p++;
} while (p < end);
}
return p;
}
njs_inline const u_char *
njs_utf8_prev(const u_char *p, const u_char *start)
{
u_char c;
do {
p--;
if (njs_slow_path(p < start)) {
break;
}
c = *p;
} while ((c & 0xC0) == 0x80);
return p;
}
njs_inline u_char *
njs_utf8_copy(u_char *dst, const u_char **src, const u_char *end)
{
u_char c;
const u_char *p;
p = *src;
c = *p++;
*dst++ = c;
if ((c & 0x80) != 0) {
do {
c = *p;
if ((c & 0xC0) != 0x80) {
break;
}
*dst++ = c;
p++;
} while (p < end);
}
*src = p;
return dst;
}
njs_inline void
njs_utf8_decode_init(njs_unicode_decode_t *ctx)
{
ctx->need = 0x00;
ctx->lower = 0x00;
ctx->codepoint = 0;
}
njs_inline ssize_t
njs_utf8_length(const u_char *p, size_t len)
{
njs_unicode_decode_t ctx;
njs_utf8_decode_init(&ctx);
return njs_utf8_stream_length(&ctx, p, len, 1, 1, NULL);
}
njs_inline size_t
njs_utf8_bom(const u_char *start, const u_char *end)
{
if (start + 3 > end) {
return 0;
}
if (start[0] == 0xEF && start[1] == 0xBB && start[2] == 0xBF) {
return 3;
}
return 0;
}
njs_inline size_t
njs_utf8_size(uint32_t cp)
{
return (cp < 0x80) ? 1 : ((cp < 0x0800) ? 2 : ((cp < 0x10000) ? 3 : 4));
}
njs_inline size_t
njs_utf8_size_uint16(uint32_t cp)
{
return ((cp < 0x80) ? 1 : ((cp < 0x0800) ? 2 : 3));
}
njs_inline njs_bool_t
njs_utf8_is_whitespace(uint32_t c)
{
switch (c) {
case 0x0009: /* <TAB> */
case 0x000A: /* <LF> */
case 0x000B: /* <VT> */
case 0x000C: /* <FF> */
case 0x000D: /* <CR> */
case 0x0020: /* <SP> */
case 0x00A0: /* <NBSP> */
case 0x1680:
case 0x2000:
case 0x2001:
case 0x2002:
case 0x2003:
case 0x2004:
case 0x2005:
case 0x2006:
case 0x2007:
case 0x2008:
case 0x2009:
case 0x200A:
case 0x2028: /* <LS> */
case 0x2029: /* <PS> */
case 0x202F:
case 0x205F:
case 0x3000:
case 0xFEFF: /* <BOM> */
return 1;
default:
return 0;
}
}
#endif /* _NJS_UTF8_H_INCLUDED_ */
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