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/*
* Copyright (C) Alexander Borisov
* Copyright (C) NGINX, Inc.
*/
#include <njs_main.h>
njs_inline void
njs_utf16_encode_write(uint32_t cp, u_char **start)
{
#ifdef NJS_HAVE_BIG_ENDIAN
*(*start)++ = cp >> 8;
*(*start)++ = cp & 0x00FF;
#else
*(*start)++ = cp & 0x00FF;
*(*start)++ = cp >> 8;
#endif
}
ssize_t
njs_utf16_encode(uint32_t cp, u_char **start, const u_char *end)
{
if ((*start + 2) > end) {
return NJS_ERROR;
}
if (cp < 0x10000) {
njs_utf16_encode_write(cp, start);
return 2;
}
if ((*start + 4) > end) {
return NJS_ERROR;
}
cp -= 0x10000;
njs_utf16_encode_write((0xD800 | (cp >> 0x0A)), start);
njs_utf16_encode_write((0xDC00 | (cp & 0x03FF)), start);
return 4;
}
uint32_t
njs_utf16_decode(njs_unicode_decode_t *ctx, const u_char **start,
const u_char *end)
{
uint32_t unit;
unsigned lead;
if (ctx->upper != 0x00) {
lead = ctx->upper - 0x01;
ctx->upper = 0x00;
goto lead_state;
}
pair_state:
lead = *(*start)++;
if (*start >= end) {
ctx->upper = lead + 0x01;
return NJS_UNICODE_CONTINUE;
}
lead_state:
#ifdef NJS_HAVE_BIG_ENDIAN
unit = (lead << 8) + *(*start)++;
#else
unit = (*(*start)++ << 8) + lead;
#endif
if (ctx->codepoint != 0x00) {
if (njs_surrogate_trailing(unit)) {
unit = njs_surrogate_pair(ctx->codepoint, unit);
ctx->codepoint = 0x00;
return unit;
}
(*start)--;
ctx->upper = lead + 0x01;
ctx->codepoint = 0x00;
return NJS_UNICODE_ERROR;
}
if (njs_surrogate_any(unit)) {
if (njs_surrogate_trailing(unit)) {
return NJS_UNICODE_ERROR;
}
ctx->codepoint = unit;
if (*start >= end) {
return NJS_UNICODE_CONTINUE;
}
goto pair_state;
}
return unit;
}
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