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decklink: Fix broken COM string conversion

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WideCharToMultiByte return is the string length without null terminate
character if passed "cchWideChar" does not include the null terminate
character size. Instead of passing the exact string length, pass -1 so that
the API can understand the input string is null terminated already and
returned value from the API includes the character.

Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3023
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5444>
This commit is contained in:
Seungha Yang 2023-10-09 19:09:15 +09:00
parent c020dab393
commit 3536b7f3a6
1 changed files with 4 additions and 6 deletions
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10
subprojects/gst-plugins-bad/sys/decklink/gstdecklink.h
View file

@ -37,19 +37,17 @@
#define COMSTR_T BSTR
#define CONVERT_COM_STRING(s) G_STMT_START { \
BSTR _s = (BSTR)s; \
int _s_length = ::SysStringLen(_s); \
int _length = ::WideCharToMultiByte(CP_ACP, 0, (wchar_t*)_s, _s_length, NULL, 0, NULL, NULL); \
int _length = ::WideCharToMultiByte(CP_ACP, 0, (wchar_t*)_s, -1, NULL, 0, NULL, NULL); \
s = (char *) malloc(_length); \
::WideCharToMultiByte(CP_ACP, 0, (wchar_t*)_s, _s_length, s, _length, NULL, NULL); \
::WideCharToMultiByte(CP_ACP, 0, (wchar_t*)_s, -1, s, _length, NULL, NULL); \
::SysFreeString(_s); \
} G_STMT_END
#define FREE_COM_STRING(s) free(s);
#define CONVERT_TO_COM_STRING(s) G_STMT_START { \
char * _s = (char *)s; \
int _s_length = strlen((char*)_s); \
int _length = ::MultiByteToWideChar(CP_ACP, 0, (char*)_s, _s_length, NULL, 0); \
int _length = ::MultiByteToWideChar(CP_ACP, 0, (char*)_s, -1, NULL, 0); \
s = ::SysAllocStringLen(NULL, _length); \
::MultiByteToWideChar(CP_ACP, 0, (char*)_s, _s_length, s, _length); \
::MultiByteToWideChar(CP_ACP, 0, (char*)_s, -1, s, _length); \
g_free(_s); \
} G_STMT_END
#elif defined(__APPLE__)