reactos/sdk/lib/inflib/infhostrtl.c

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/*
* PROJECT: .inf file parser
* LICENSE: GPL - See COPYING in the top level directory
* PROGRAMMER: Royce Mitchell III
* Eric Kohl
* Ge van Geldorp <gvg@reactos.org>
*/
/* INCLUDES *****************************************************************/
#include "inflib.h"
#include "infhost.h"
#define NDEBUG
#include <debug.h>
NTSTATUS NTAPI
RtlMultiByteToUnicodeN(
IN PWCHAR UnicodeString,
IN ULONG UnicodeSize,
IN PULONG ResultSize,
IN PCSTR MbString,
IN ULONG MbSize)
{
ULONG Size = 0;
ULONG i;
PUCHAR WideString;
/* single-byte code page */
if (MbSize > (UnicodeSize / sizeof(WCHAR)))
Size = UnicodeSize / sizeof(WCHAR);
else
Size = MbSize;
if (ResultSize != NULL)
*ResultSize = Size * sizeof(WCHAR);
WideString = (PUCHAR)UnicodeString;
for (i = 0; i < Size; i++)
{
WideString[2 * i + 0] = (UCHAR)MbString[i];
WideString[2 * i + 1] = 0;
}
return STATUS_SUCCESS;
}
BOOLEAN
NTAPI
RtlIsTextUnicode( PVOID buf, INT len, INT *pf )
{
static const WCHAR std_control_chars[] = {'\r','\n','\t',' ',0x3000,0};
static const WCHAR byterev_control_chars[] = {0x0d00,0x0a00,0x0900,0x2000,0};
const WCHAR *s = buf;
int i;
unsigned int flags = MAXULONG, out_flags = 0;
if (len < sizeof(WCHAR))
{
/* FIXME: MSDN documents IS_TEXT_UNICODE_BUFFER_TOO_SMALL but there is no such thing... */
if (pf) *pf = 0;
return FALSE;
}
if (pf)
flags = (unsigned int)*pf;
/*
* Apply various tests to the text string. According to the
* docs, each test "passed" sets the corresponding flag in
* the output flags. But some of the tests are mutually
* exclusive, so I don't see how you could pass all tests ...
*/
/* Check for an odd length ... pass if even. */
if (len & 1) out_flags |= IS_TEXT_UNICODE_ODD_LENGTH;
if (((char *)buf)[len - 1] == 0)
len--; /* Windows seems to do something like that to avoid e.g. false IS_TEXT_UNICODE_NULL_BYTES */
len /= (INT)sizeof(WCHAR);
/* Windows only checks the first 256 characters */
if (len > 256) len = 256;
/* Check for the special byte order unicode marks. */
if (*s == 0xFEFF) out_flags |= IS_TEXT_UNICODE_SIGNATURE;
if (*s == 0xFFFE) out_flags |= IS_TEXT_UNICODE_REVERSE_SIGNATURE;
/* apply some statistical analysis */
if (flags & IS_TEXT_UNICODE_STATISTICS)
{
int stats = 0;
/* FIXME: checks only for ASCII characters in the unicode stream */
for (i = 0; i < len; i++)
{
if (s[i] <= 255) stats++;
}
if (stats > len / 2)
out_flags |= IS_TEXT_UNICODE_STATISTICS;
}
/* Check for unicode NULL chars */
if (flags & IS_TEXT_UNICODE_NULL_BYTES)
{
for (i = 0; i < len; i++)
{
if (!(s[i] & 0xff) || !(s[i] >> 8))
{
out_flags |= IS_TEXT_UNICODE_NULL_BYTES;
break;
}
}
}
if (flags & IS_TEXT_UNICODE_CONTROLS)
{
for (i = 0; i < len; i++)
{
if (strchrW(std_control_chars, s[i]))
{
out_flags |= IS_TEXT_UNICODE_CONTROLS;
break;
}
}
}
if (flags & IS_TEXT_UNICODE_REVERSE_CONTROLS)
{
for (i = 0; i < len; i++)
{
if (strchrW(byterev_control_chars, s[i]))
{
out_flags |= IS_TEXT_UNICODE_REVERSE_CONTROLS;
break;
}
}
}
if (pf)
{
out_flags &= (unsigned int)*pf;
*pf = (INT)out_flags;
}
/* check for flags that indicate it's definitely not valid Unicode */
if (out_flags & (IS_TEXT_UNICODE_REVERSE_MASK | IS_TEXT_UNICODE_NOT_UNICODE_MASK)) return FALSE;
/* now check for invalid ASCII, and assume Unicode if so */
if (out_flags & IS_TEXT_UNICODE_NOT_ASCII_MASK) return TRUE;
/* now check for Unicode flags */
if (out_flags & IS_TEXT_UNICODE_UNICODE_MASK) return TRUE;
/* no flags set */
return FALSE;
}