mirror of
https://github.com/reactos/reactos.git
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262 lines
6.8 KiB
C
262 lines
6.8 KiB
C
/*
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* PROJECT: ReactOS Kernel - Vista+ APIs
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* LICENSE: GPL v2 - See COPYING in the top level directory
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* FILE: lib/drivers/ntoskrnl_vista/rtl.c
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* PURPOSE: Rtl functions of Vista+
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* PROGRAMMERS: Thomas Faber <thomas.faber@reactos.org>
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*/
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#include <ntdef.h>
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#include <ntifs.h>
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typedef UCHAR BYTE;
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/******************************************************************************
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* RtlUnicodeToUTF8N [NTDLL.@]
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*/
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NTSTATUS NTAPI RtlUnicodeToUTF8N(CHAR *utf8_dest, ULONG utf8_bytes_max,
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ULONG *utf8_bytes_written,
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const WCHAR *uni_src, ULONG uni_bytes)
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{
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NTSTATUS status;
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ULONG i;
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ULONG written;
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ULONG ch;
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BYTE utf8_ch[4];
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ULONG utf8_ch_len;
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if (!uni_src)
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return STATUS_INVALID_PARAMETER_4;
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if (!utf8_bytes_written)
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return STATUS_INVALID_PARAMETER;
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if (utf8_dest && uni_bytes % sizeof(WCHAR))
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return STATUS_INVALID_PARAMETER_5;
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written = 0;
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status = STATUS_SUCCESS;
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for (i = 0; i < uni_bytes / sizeof(WCHAR); i++)
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{
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/* decode UTF-16 into ch */
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ch = uni_src[i];
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if (ch >= 0xdc00 && ch <= 0xdfff)
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{
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ch = 0xfffd;
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status = STATUS_SOME_NOT_MAPPED;
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}
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else if (ch >= 0xd800 && ch <= 0xdbff)
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{
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if (i + 1 < uni_bytes / sizeof(WCHAR))
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{
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ch -= 0xd800;
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ch <<= 10;
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if (uni_src[i + 1] >= 0xdc00 && uni_src[i + 1] <= 0xdfff)
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{
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ch |= uni_src[i + 1] - 0xdc00;
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ch += 0x010000;
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i++;
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}
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else
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{
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ch = 0xfffd;
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status = STATUS_SOME_NOT_MAPPED;
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}
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}
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else
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{
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ch = 0xfffd;
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status = STATUS_SOME_NOT_MAPPED;
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}
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}
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/* encode ch as UTF-8 */
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ASSERT(ch <= 0x10ffff);
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if (ch < 0x80)
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{
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utf8_ch[0] = ch & 0x7f;
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utf8_ch_len = 1;
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}
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else if (ch < 0x800)
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{
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utf8_ch[0] = 0xc0 | (ch >> 6 & 0x1f);
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utf8_ch[1] = 0x80 | (ch >> 0 & 0x3f);
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utf8_ch_len = 2;
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}
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else if (ch < 0x10000)
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{
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utf8_ch[0] = 0xe0 | (ch >> 12 & 0x0f);
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utf8_ch[1] = 0x80 | (ch >> 6 & 0x3f);
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utf8_ch[2] = 0x80 | (ch >> 0 & 0x3f);
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utf8_ch_len = 3;
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}
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else if (ch < 0x200000)
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{
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utf8_ch[0] = 0xf0 | (ch >> 18 & 0x07);
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utf8_ch[1] = 0x80 | (ch >> 12 & 0x3f);
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utf8_ch[2] = 0x80 | (ch >> 6 & 0x3f);
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utf8_ch[3] = 0x80 | (ch >> 0 & 0x3f);
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utf8_ch_len = 4;
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}
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if (!utf8_dest)
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{
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written += utf8_ch_len;
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continue;
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}
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if (utf8_bytes_max >= utf8_ch_len)
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{
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memcpy(utf8_dest, utf8_ch, utf8_ch_len);
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utf8_dest += utf8_ch_len;
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utf8_bytes_max -= utf8_ch_len;
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written += utf8_ch_len;
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}
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else
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{
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utf8_bytes_max = 0;
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status = STATUS_BUFFER_TOO_SMALL;
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}
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}
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*utf8_bytes_written = written;
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return status;
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}
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/******************************************************************************
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* RtlUTF8ToUnicodeN [NTDLL.@]
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*/
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NTSTATUS NTAPI RtlUTF8ToUnicodeN(WCHAR *uni_dest, ULONG uni_bytes_max,
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ULONG *uni_bytes_written,
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const CHAR *utf8_src, ULONG utf8_bytes)
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{
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NTSTATUS status;
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ULONG i, j;
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ULONG written;
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ULONG ch;
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ULONG utf8_trail_bytes;
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WCHAR utf16_ch[3];
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ULONG utf16_ch_len;
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if (!utf8_src)
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return STATUS_INVALID_PARAMETER_4;
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if (!uni_bytes_written)
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return STATUS_INVALID_PARAMETER;
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written = 0;
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status = STATUS_SUCCESS;
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for (i = 0; i < utf8_bytes; i++)
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{
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/* read UTF-8 lead byte */
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ch = (BYTE)utf8_src[i];
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utf8_trail_bytes = 0;
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if (ch >= 0xf5)
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{
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ch = 0xfffd;
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status = STATUS_SOME_NOT_MAPPED;
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}
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else if (ch >= 0xf0)
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{
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ch &= 0x07;
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utf8_trail_bytes = 3;
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}
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else if (ch >= 0xe0)
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{
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ch &= 0x0f;
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utf8_trail_bytes = 2;
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}
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else if (ch >= 0xc2)
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{
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ch &= 0x1f;
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utf8_trail_bytes = 1;
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}
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else if (ch >= 0x80)
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{
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/* overlong or trail byte */
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ch = 0xfffd;
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status = STATUS_SOME_NOT_MAPPED;
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}
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/* read UTF-8 trail bytes */
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if (i + utf8_trail_bytes < utf8_bytes)
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{
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for (j = 0; j < utf8_trail_bytes; j++)
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{
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if ((utf8_src[i + 1] & 0xc0) == 0x80)
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{
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ch <<= 6;
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ch |= utf8_src[i + 1] & 0x3f;
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i++;
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}
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else
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{
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ch = 0xfffd;
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utf8_trail_bytes = 0;
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status = STATUS_SOME_NOT_MAPPED;
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break;
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}
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}
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}
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else
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{
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ch = 0xfffd;
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utf8_trail_bytes = 0;
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status = STATUS_SOME_NOT_MAPPED;
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i = utf8_bytes;
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}
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/* encode ch as UTF-16 */
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if ((ch > 0x10ffff) ||
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(ch >= 0xd800 && ch <= 0xdfff) ||
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(utf8_trail_bytes == 2 && ch < 0x00800) ||
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(utf8_trail_bytes == 3 && ch < 0x10000))
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{
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/* invalid codepoint or overlong encoding */
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utf16_ch[0] = 0xfffd;
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utf16_ch[1] = 0xfffd;
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utf16_ch[2] = 0xfffd;
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utf16_ch_len = utf8_trail_bytes;
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status = STATUS_SOME_NOT_MAPPED;
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}
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else if (ch >= 0x10000)
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{
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/* surrogate pair */
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ch -= 0x010000;
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utf16_ch[0] = 0xd800 + (ch >> 10 & 0x3ff);
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utf16_ch[1] = 0xdc00 + (ch >> 0 & 0x3ff);
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utf16_ch_len = 2;
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}
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else
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{
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/* single unit */
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utf16_ch[0] = ch;
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utf16_ch_len = 1;
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}
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if (!uni_dest)
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{
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written += utf16_ch_len;
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continue;
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}
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for (j = 0; j < utf16_ch_len; j++)
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{
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if (uni_bytes_max >= sizeof(WCHAR))
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{
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*uni_dest++ = utf16_ch[j];
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uni_bytes_max -= sizeof(WCHAR);
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written++;
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}
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else
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{
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uni_bytes_max = 0;
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status = STATUS_BUFFER_TOO_SMALL;
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}
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}
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}
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*uni_bytes_written = written * sizeof(WCHAR);
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return status;
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}
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