private static bool IsValidPathSegment(CanonicalTreeParser t)
{
string osName = SystemReader.GetInstance().GetProperty("os.name");
bool isWindows = "Windows".Equals(osName);
bool isOSX = "Darwin".Equals(osName) || "Mac OS X".Equals(osName);
bool ignCase = isOSX || isWindows;
int ptr = t.GetNameOffset();
byte[] raw = t.GetEntryPathBuffer();
int end = ptr + t.NameLength;
// Validate path component at this level of the tree
int start = ptr;
while (ptr < end)
{
if (raw[ptr] == '/')
{
return false;
}
if (isWindows)
{
if (raw[ptr] == '\\')
{
return false;
}
if (raw[ptr] == ':')
{
return false;
}
}
ptr++;
}
// '.' and '.'' are invalid here
if (ptr - start == 1)
{
if (raw[start] == '.')
{
return false;
}
}
else
{
if (ptr - start == 2)
{
if (raw[start] == '.')
{
if (raw[start + 1] == '.')
{
return false;
}
}
}
else
{
if (ptr - start == 4)
{
// .git (possibly case insensitive) is disallowed
if (raw[start] == '.')
{
if (raw[start + 1] == 'g' || (ignCase && raw[start + 1] == 'G'))
{
if (raw[start + 2] == 'i' || (ignCase && raw[start + 2] == 'I'))
{
if (raw[start + 3] == 't' || (ignCase && raw[start + 3] == 'T'))
{
return false;
}
}
}
}
}
}
}
if (isWindows)
{
// Space or period at end of file name is ignored by Windows.
// Treat this as a bad path for now. We may want to handle
// this as case insensitivity in the future.
if (raw[ptr - 1] == '.' || raw[ptr - 1] == ' ')
{
return false;
}
int i;
// Bad names, eliminate suffix first
for (i = start; i < ptr; ++i)
{
if (raw[i] == '.')
{
break;
}
}
int len = i - start;
if (len == 3 || len == 4)
{
for (int j = 0; j < forbidden.Length; ++j)
{
if (forbidden[j].Length == len)
{
if (((sbyte)ToUpper(raw[start])) < forbidden[j][0])
{
break;
}
int k;
for (k = 0; k < len; ++k)
{
if (ToUpper(raw[start + k]) != forbidden[j][k])
{
break;
}
}
if (k == len)
{
return false;
}
}
}
}
}
return true;
}
