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