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/********************************************************/
/* ntapi: Native API core library */
/* Copyright (C) 2013--2021 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
/********************************************************/
#include <psxtypes/psxtypes.h>
#include <ntapi/nt_status.h>
#include <ntapi/nt_unicode.h>
#include "ntapi_impl.h"
/**
* unofficial bit distribution table for comprehension purposes only
*
* scalar nickname utf-16 utf-8[0] utf-8[1] utf-8[2] utf-8[3]
* ------ -------- -------- -------- -------- -------- --------
* 00000000 7x 00000000 0xxxxxxx
* 0xxxxxxx 0xxxxxxx
*
* 00000yyy 5y6x 00000yyy 110yyyyy 10xxxxxx
* yyxxxxxx yyxxxxxx
*
* zzzzyyyy 4z6y6x zzzzyyyy 1110zzzz 10yyyyyy 10xxxxxx
* yyxxxxxx yyxxxxxx
*
* 000uuuuu 5u4z6y6x 110110ww 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx
* zzzzyyyy wwzzzzyy
* yyxxxxxx 110111yy
* yyxxxxxx (where wwww = uuuuu - 1)
*
*
* validation of utf-8
*
* from to utf-8[0] utf-8[1] utf-8[2] utf-8[3]
* ------ ------ -------- -------- -------- --------
* 0x0000 0x007F 00..7F
* 0x0080 0x07FF C2..DF 80..BF
* 0x0800 0x0FFF E0 A0..BF 80..BF
* 0x1000 0xCFFF E1..EC 80..BF 80..BF
* 0xD000 0xD7FF ED 80..9F 80..BF
* 0xE000 0xFFFF EE..EF 80..BF 80..BF
* 0x10000 0x3FFFF F0 90..BF 80..BF 80..BF
* 0x40000 0xFFFFF F1..F3 80..BF 80..BF 80..BF
* 0x100000 0x10FFFF F4 80..8F 80..BF 80..BF
*
**/
#define __AVAILABLE_CODE_POINTS 0x110000
int __stdcall __ntapi_uc_get_code_point_byte_count_utf8(uint32_t code_point)
{
/* try clearing 7x bits */
if ((code_point >> 7) == 0)
return 1;
/* try clearing 5y + 6x bits */
else if ((code_point >> 11) == 0)
return 2;
/* try clearing 4z +6y + 6x bits */
else if ((code_point >> 16) == 0)
return 3;
/* try clearing 5u + 4z + 6y + 6x bits */
else if ((code_point >> 21) == 0)
return 4;
/* __AVAILABLE_CODE_POINTS exceeded */
else
return 0;
}
int __stdcall __ntapi_uc_get_code_point_byte_count_utf16(uint32_t code_point)
{
/* try clearing 4z +6y + 6x bits */
if ((code_point >> 16) == 0)
return 2;
/* try clearing 5u + 4z + 6y + 6x bits */
else if ((code_point >> 21) == 0)
return 4;
/* __AVAILABLE_CODE_POINTS exceeded */
else
return 0;
}
/**
* following is a straight-forward implementation
* of unicode conversion and validation (see also:
* Table 3-7 of the Unicode Standard, version 6.2).
*
* the use of callbacks allows the validation
* functions to be the basis of our utf-8 conversion
* functions on the one hand, and the posix path arg
* normalization routine on the other.
**/
static int32_t __fastcall __default_callback_fn_utf8(nt_utf8_callback_args * args)
{
args->src += args->byte_count;
return NT_STATUS_SUCCESS;
}
int32_t __stdcall __ntapi_uc_validate_unicode_stream_utf8(
__in const unsigned char * ch,
__in size_t size_in_bytes __optional,
__out size_t * code_points __optional,
__out const unsigned char ** addr_failed __optional,
__in ntapi_uc_utf8_callback_fn ** callback_fn __optional,
__in nt_utf8_callback_args * callback_args __optional)
{
int32_t status;
const unsigned char * utf8;
unsigned char * ch_boundary;
unsigned char byte_count;
size_t _code_points;
ntapi_uc_utf8_callback_fn * _callback_fn[5];
nt_utf8_callback_args _callback_args;
if (!callback_fn) {
_callback_fn[0] = __default_callback_fn_utf8;
_callback_fn[1] = __default_callback_fn_utf8;
_callback_fn[2] = __default_callback_fn_utf8;
_callback_fn[3] = __default_callback_fn_utf8;
_callback_fn[4] = __default_callback_fn_utf8;
callback_fn = (ntapi_uc_utf8_callback_fn **)&_callback_fn;
}
if (!callback_args) {
callback_args = &_callback_args;
callback_args->src = (unsigned char *)0;
}
if (callback_args->src)
ch = callback_args->src;
else
callback_args->src = ch;
if (size_in_bytes)
ch_boundary = (unsigned char *)((uintptr_t)ch + size_in_bytes);
else
ch_boundary = (unsigned char *)(~0);
if (!code_points)
code_points = &_code_points;
while ((ch < ch_boundary) && (*ch)) {
utf8 = ch;
byte_count = 0;
/* try one byte */
if (utf8[0] <= 0x7F)
byte_count = 1;
/* try two bytes */
else if ((++ch < ch_boundary)
&& (utf8[0] >= 0xC2) && (utf8[0] <= 0xDF)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0xBF))
byte_count = 2;
/* try three bytes */
else if ((++ch < ch_boundary)
&& (utf8[0] == 0xE0)
&& (utf8[1] >= 0xA0) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF))
byte_count = 3;
else if (
(utf8[0] >= 0xE1) && (utf8[0] <= 0xEC)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF))
byte_count = 3;
else if (
(utf8[0] == 0xED)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0x9F)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF))
byte_count = 3;
else if (
(utf8[0] >= 0xEE) && (utf8[0] <= 0xEF)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF))
byte_count = 3;
/* try four bytes */
else if ((++ch < ch_boundary)
&& (utf8[0] == 0xF0)
&& (utf8[1] >= 0x90) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF)
&& (utf8[3] >= 0x80) && (utf8[3] <= 0xBF))
byte_count = 4;
else if (
(utf8[0] >= 0xF1) && (utf8[0] <= 0xF3)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0xBF)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF)
&& (utf8[3] >= 0x80) && (utf8[3] <= 0xBF))
byte_count = 4;
else if (
(utf8[0] == 0xF4)
&& (utf8[1] >= 0x80) && (utf8[1] <= 0x8F)
&& (utf8[2] >= 0x80) && (utf8[2] <= 0xBF)
&& (utf8[3] >= 0x80) && (utf8[3] <= 0xBF))
byte_count = 4;
if (byte_count) {
(*code_points)++;
callback_args->byte_count = byte_count;
if ((status = callback_fn[byte_count](callback_args)))
return status;
} else {
if (addr_failed)
*addr_failed = (void *)utf8;
return NT_STATUS_ILLEGAL_CHARACTER;
}
/* advance, transcode if needed */
ch = callback_args->src;
}
if ((ch < ch_boundary) && (*ch == 0)) {
callback_args->byte_count = 1;
return callback_fn[0](callback_args);
}
return NT_STATUS_SUCCESS;
}
static int32_t __fastcall __default_callback_fn_utf16(nt_utf16_callback_args * args)
{
if (args->byte_count == 4)
args->src += 2;
else
args->src++;
return NT_STATUS_SUCCESS;
}
int32_t __stdcall __ntapi_uc_validate_unicode_stream_utf16(
__in const wchar16_t * wch,
__in size_t size_in_bytes __optional,
__out size_t * code_points __optional,
__out const wchar16_t ** addr_failed __optional,
__in ntapi_uc_utf16_callback_fn ** callback_fn __optional,
__in nt_utf16_callback_args * callback_args __optional)
{
int32_t status;
const wchar16_t * wch_trail;
wchar16_t * wch_boundary;
unsigned char byte_count;
size_t _code_points;
ntapi_uc_utf16_callback_fn * _callback_fn[5];
nt_utf16_callback_args _callback_args;
if (!callback_fn) {
_callback_fn[0] = __default_callback_fn_utf16;
_callback_fn[1] = __default_callback_fn_utf16;
_callback_fn[2] = __default_callback_fn_utf16;
_callback_fn[3] = __default_callback_fn_utf16;
_callback_fn[4] = __default_callback_fn_utf16;
callback_fn = (ntapi_uc_utf16_callback_fn **)&_callback_fn;
}
if (!callback_args) {
callback_args = &_callback_args;
callback_args->src = (wchar16_t *)0;
}
if (callback_args->src)
wch = callback_args->src;
else
callback_args->src = wch;
if (size_in_bytes)
wch_boundary = (wchar16_t *)((uintptr_t)wch + size_in_bytes);
else
wch_boundary = (wchar16_t *)(~0);
if (!code_points)
code_points = &_code_points;
while ((wch < wch_boundary) && (*wch)) {
byte_count = 0;
/* try one byte */
if (*wch <= 0x7F)
byte_count = 1;
/* try two bytes */
else if (*wch <= 0x7FF)
byte_count = 2;
/* try three bytes */
else if ((*wch < 0xD800) || (*wch >= 0xE000))
byte_count = 3;
/* try four bytes */
else if ((*wch >= 0xD800) && (*wch < 0xDC00)) {
wch_trail = wch + 1;
if ((wch_trail < wch_boundary)
&& (*wch_trail >= 0xDC00)
&& (*wch_trail < 0xE000))
byte_count = 4;
}
if (byte_count) {
(*code_points)++;
callback_args->byte_count = byte_count;
if ((status = callback_fn[byte_count](callback_args)))
return status;
} else {
if (addr_failed)
*addr_failed = (void *)wch;
return NT_STATUS_ILLEGAL_CHARACTER;
}
/* advance, transcode as needed */
wch = callback_args->src;
}
if ((wch < wch_boundary) && (*wch == 0)) {
callback_args->byte_count = 1;
return callback_fn[0](callback_args);
}
return NT_STATUS_SUCCESS;
}
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