[PATCH 0/1] MR1518: mfplat: Use the iswxdigit function instead of reimplementing it.

[PATCH 1/1] mfplat: Use the iswxdigit function instead of reimplementing it.

[Alex Henrie]

From: Alex Henrie

---
 dlls/mfplat/main.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/dlls/mfplat/main.c b/dlls/mfplat/main.c
index ebab4ed6f1f..05974a6666b 100644
--- a/dlls/mfplat/main.c
+++ b/dlls/mfplat/main.c
@@ -646,15 +646,6 @@ static WCHAR* guid_to_string(WCHAR *str, REFGUID guid)
     return str;
 }

-static inline BOOL is_valid_hex(WCHAR c)
-{
-    if (!(((c >= '0') && (c <= '9'))  ||
-          ((c >= 'a') && (c <= 'f'))  ||
-          ((c >= 'A') && (c <= 'F'))))
-        return FALSE;
-    return TRUE;
-}
-
 static BOOL GUIDFromString(LPCWSTR s, GUID *id)
 {
     int i;
@@ -664,7 +655,7 @@ static BOOL GUIDFromString(LPCWSTR s, GUID *id)
     id->Data1 = 0;
     for (i = 0; i < 8; i++)
     {
-        if (!is_valid_hex(s[i])) return FALSE;
+        if (!iswxdigit(s[i])) return FALSE;
         id->Data1 = (id->Data1 << 4) | guid_conv_table[s[i]];
     }
     if (s[8]!='-') return FALSE;
@@ -672,7 +663,7 @@ static BOOL GUIDFromString(LPCWSTR s, GUID *id)
     id->Data2 = 0;
     for (i = 9; i < 13; i++)
     {
-        if (!is_valid_hex(s[i])) return FALSE;
+        if (!iswxdigit(s[i])) return FALSE;
         id->Data2 = (id->Data2 << 4) | guid_conv_table[s[i]];
     }
     if (s[13]!='-') return FALSE;
@@ -680,7 +671,7 @@ static BOOL GUIDFromString(LPCWSTR s, GUID *id)
     id->Data3 = 0;
     for (i = 14; i < 18; i++)
     {
-        if (!is_valid_hex(s[i])) return FALSE;
+        if (!iswxdigit(s[i])) return FALSE;
         id->Data3 = (id->Data3 << 4) | guid_conv_table[s[i]];
     }
     if (s[18]!='-') return FALSE;
@@ -692,7 +683,7 @@ static BOOL GUIDFromString(LPCWSTR s, GUID *id)
             if (s[i]!='-') return FALSE;
             i++;
         }
-        if (!is_valid_hex(s[i]) || !is_valid_hex(s[i+1])) return FALSE;
+        if (!iswxdigit(s[i]) || !iswxdigit(s[i+1])) return FALSE;
         id->Data4[(i-19)/2] = guid_conv_table[s[i]] << 4 | guid_conv_table[s[i+1]];
     }

[Nikolay Sivov (＠nsivov)]

This is not an equivalent change. We don't need fullwidth forms to pass this hex check. Unless this happens on windows, which seems very unlikely.

[Alex Henrie (＠alexhenrie)]

On Wed Nov 23 06:43:09 2022 +0000, Nikolay Sivov wrote:
> This is not an equivalent change. We don't need fullwidth forms to pass
> this hex check. Unless this happens on windows, which seems very unlikely.

My mistake. It looks like the equivalent function is `isxdigit`, without the "w". Despite the lack of a "w" it does operate on Unicode characters.