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-rw-r--r--src/emu/hash.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/src/emu/hash.c b/src/emu/hash.c
index ad2322cf1c2..8b47a206a5c 100644
--- a/src/emu/hash.c
+++ b/src/emu/hash.c
@@ -199,12 +199,22 @@ const char *hash_base::string(astring &buffer)
bool hash_base::from_string(const char *&string, int length)
{
+ // reset the error and our buffer
+ m_parse_error = false;
+ memset(m_bufptr, 0, m_length);
+
+ // special case for idiom HASH(1) to map to a dummy (0) hash
+ if (string[0] == '1' && fromhex(string[1]) == -1)
+ {
+ string++;
+ return true;
+ }
+
// fail if we're too short
if (length < 2 * m_length)
return false;
// loop over bytes
- m_parse_error = false;
for (int index = 0; index < m_length; index++)
{
// parse the upper digit
@@ -212,7 +222,6 @@ bool hash_base::from_string(const char *&string, int length)
if (upper == -1)
{
m_parse_error = true;
- memset(m_bufptr, 0, m_length);
return false;
}
@@ -221,7 +230,6 @@ bool hash_base::from_string(const char *&string, int length)
if (lower == -1)
{
m_parse_error = true;
- memset(m_bufptr, 0, m_length);
return false;
}