Blame src/unicode/ntapi_uc_unicode_conversion_from_utf16.c

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/********************************************************/
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/*  ntapi: Native API core library                      */
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/*  Copyright (C) 2013--2016  Z. Gilboa                 */
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/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
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/********************************************************/
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#include <psxtypes/psxtypes.h>
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#include <ntapi/nt_status.h>
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#include <ntapi/nt_unicode.h>
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#include "ntapi_impl.h"
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static int32_t __fastcall __utf16_to_utf8_handler_1byte_or_null_termination(nt_utf16_callback_args * args)
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{
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	/*******************************************/
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	/* from: 00000000 0xxxxxxx (little endian) */
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	/* to:   0xxxxxxx          (utf-8)         */
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	/*******************************************/
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	uint8_t * dst;
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	if (args->dst >= args->dst_cap)
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		return NT_STATUS_BUFFER_TOO_SMALL;
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	dst  = (uint8_t *)args->dst;
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	*dst = *(uint8_t *)(args->src);
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	/* advance source and destination buffer */
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	args->src++;
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	args->dst = (void *)((uintptr_t)(args->dst) + 1);
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	/* bytes_written */
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	args->bytes_written++;
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	return NT_STATUS_SUCCESS;
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}
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static int32_t __fastcall __utf16_to_utf8_handler_2bytes(nt_utf16_callback_args * args)
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{
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	/*******************************************/
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	/* from: 00000yyy yyxxxxxx (little endian) */
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	/* to:   110yyyyy 10xxxxxx (utf-8)         */
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	/*******************************************/
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	const wchar16_t * src;
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	uint8_t *	  dst;
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	wchar16_t	wx;
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	wchar16_t	wy;
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	if ((uintptr_t)(args->dst) + 1 >= (uintptr_t)(args->dst_cap))
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		return NT_STATUS_BUFFER_TOO_SMALL;
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	src = args->src;
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	dst = (uint8_t *)args->dst;
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	wy  = *src;
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	wy >>= 6;
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	wx  = *src;
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	wx <<= 10;
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	wx >>= 10;
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	/* write the y part */
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	*dst = (char)(0xC0 | wy);
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	dst++;
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	/* write the x part */
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	*dst = (char)(0x80 | wx);
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	/* advance source and destination buffer */
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	args->src++;
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	args->dst = (void *)((uintptr_t)(args->dst) + 2);
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	/* bytes_written */
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	args->bytes_written += 2;
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	return NT_STATUS_SUCCESS;
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}
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static int32_t __fastcall __utf16_to_utf8_handler_3bytes(nt_utf16_callback_args * args)
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{
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	/********************************************/
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	/* from: zzzzyyyy yyxxxxxx (little endian)  */
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	/* to:   1110zzzz 10yyyyyy 10xxxxxx (utf-8) */
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	/********************************************/
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	const wchar16_t * src;
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	uint8_t *	  dst;
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	wchar16_t	wx;
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	wchar16_t	wy;
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	wchar16_t	wz;
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	if ((uintptr_t)(args->dst) + 2 >= (uintptr_t)(args->dst_cap))
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		return NT_STATUS_BUFFER_TOO_SMALL;
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	src = args->src;
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	dst = (uint8_t *)args->dst;
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	wz  = *src;
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	wz >>= 12;
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	wy  = *src;
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	wy <<= 4;
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	wy >>= 10;
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	wx  = *src;
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	wx <<= 10;
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	wx >>= 10;
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	/* write the z part */
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	*dst = (char)(0xE0 | wz);
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	dst++;
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	/* write the y part */
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	*dst = (char)(0x80 | wy);
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	dst++;
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	/* write the x part */
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	*dst = (char)(0x80 | wx);
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	/* advance source and destination buffer */
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	args->src++;
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	args->dst = (void *)((uintptr_t)(args->dst) + 3);
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	/* bytes_written */
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	args->bytes_written += 3;
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	return NT_STATUS_SUCCESS;
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}
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static int32_t __fastcall __utf16_to_utf8_handler_4bytes(nt_utf16_callback_args * args)
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{
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	/****************************************************************/
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	/* from: 110110ww  wwzzzzyy  110111yy  yyxxxxxx (little endian) */
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	/* to:   11110uuu  10uuzzzz  10yyyyyy  10xxxxxx (utf-8)         */
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	/****************************************************************/
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	const wchar16_t * src;
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	uint8_t *	  dst;
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	wchar16_t	wx;
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	wchar16_t	wz;
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	wchar16_t	wy_low;
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	wchar16_t	wy_high;
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	wchar16_t	ww;
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	wchar16_t	uuuuu;
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	wchar16_t	u_low;
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	wchar16_t	u_high;
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	if ((uintptr_t)(args->dst) + 3 >= (uintptr_t)(args->dst_cap))
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		return NT_STATUS_BUFFER_TOO_SMALL;
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	src = args->src;
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	dst = (uint8_t *)args->dst;
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	/* low two bytes */
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	wx  = *src;
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	wx <<= 10;
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	wx >>= 10;
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	wy_low  = *src;
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	wy_low <<= 6;
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	wy_low >>= 12;
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	/* (surrogate pair) */
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	src++;
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	/* high two bytes */
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	wy_high  = *src;
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	wy_high <<= 14;
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	wy_high >>= 10;
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	wz  = *src;
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	wz <<= 10;
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	wz >>= 12;
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	wz <<= 2;
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	ww  = *src;
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	ww <<= 6;
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	ww >>= 12;
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	uuuuu  = ww + 1;
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	u_high  = uuuuu >> 2;
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	u_low = ((uuuuu << 14) >> 10);
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	/* 1st byte: 11110uuu */
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	*dst = (char)(0xF0 | u_high);
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	dst++;
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	/* 2nd byte: 10uuzzzz */
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	*dst = (char)(0x80 | u_low | wz);
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	dst++;
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	/* 3rd byte: 10yyyyyy */
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	*dst = (char)(0x80 | wy_low | wy_high);
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	dst++;
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	/* 4th byte: 10xxxxxx */
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	*dst = (char)(0x80 | wx);
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	/* advance source and destination buffer */
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	args->src += 2;
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	args->dst = (void *)((uintptr_t)(args->dst) + 4);
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	/* bytes_written */
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	args->bytes_written += 4;
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	return NT_STATUS_SUCCESS;
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}
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static int32_t __fastcall __update_stream_leftover_info_utf16(
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	__in_out	nt_unicode_conversion_params_utf16_to_utf8 *	params)
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{
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	int32_t		status;
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	ptrdiff_t	offset;
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	wchar16_t *	wlead;
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	offset	= (uintptr_t)params->src + (uintptr_t)params->src_size_in_bytes - (uintptr_t)params->addr_failed;
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	wlead	= (wchar16_t *)params->addr_failed;
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	if ((offset == 2) && (*wlead >= 0xD800) && (*wlead < 0xDC00)) {
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			/* possibly the lead of a surrogate pair lead */
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			params->leftover_count = 2;
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			params->leftover_bytes = *wlead;
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			params->leftover_bytes <<= 16;
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			status = NT_STATUS_SUCCESS;
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	} else {
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		params->leftover_count = 0;
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		params->leftover_bytes = 0;
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		status	= NT_STATUS_ILLEGAL_CHARACTER;
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	}
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	return status;
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}
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int32_t __stdcall 	__ntapi_uc_convert_unicode_stream_utf16_to_utf8(
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	__in_out	nt_unicode_conversion_params_utf16_to_utf8 *	params)
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{
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	int32_t 			status;
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	nt_utf16_callback_args		args;
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	ntapi_uc_utf16_callback_fn *	callback_fn[5];
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	callback_fn[0] = (ntapi_uc_utf16_callback_fn *)__utf16_to_utf8_handler_1byte_or_null_termination;
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	callback_fn[1] = (ntapi_uc_utf16_callback_fn *)__utf16_to_utf8_handler_1byte_or_null_termination;
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	callback_fn[2] = (ntapi_uc_utf16_callback_fn *)__utf16_to_utf8_handler_2bytes;
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	callback_fn[3] = (ntapi_uc_utf16_callback_fn *)__utf16_to_utf8_handler_3bytes;
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	callback_fn[4] = (ntapi_uc_utf16_callback_fn *)__utf16_to_utf8_handler_4bytes;
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	args.src		= params->src;
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	args.dst		= params->dst;
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	args.dst_cap		= (void *)((uintptr_t)(params->dst) + (params->dst_size_in_bytes));
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	args.bytes_written	= params->bytes_written;
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	status = __ntapi_uc_validate_unicode_stream_utf16(
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		params->src,
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		params->src_size_in_bytes,
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		&params->code_points,
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		&params->addr_failed,
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		callback_fn,
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		&args);
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	params->bytes_written = args.bytes_written;
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	if (status)
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		status = __update_stream_leftover_info_utf16(params);
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	/* the following bit shift will be optimized out on 32-bit architectures */
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	params->leftover_bytes <<= (8 * (sizeof(uintptr_t) - sizeof(uint32_t)));
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	return status;
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}
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int32_t __stdcall 	__ntapi_uc_convert_unicode_stream_utf16_to_utf32(
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	__in_out	nt_unicode_conversion_params_utf16_to_utf32 *	params)
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{
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	(void)params;
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	return NT_STATUS_SUCCESS;
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}