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common/info_key.cpp

@@ -0,0 +1,303 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "info_key.h"
+
+#include <stdio.h>
+#include <string.h>
+#include "tier1/strtools.h"
+
+#define MAX_KV_LEN 127
+/*
+===============
+Info_ValueForKey
+
+Searches the string for the given
+key and returns the associated value, or an empty string.
+===============
+*/
+const char *Info_ValueForKey ( const char *s, const char *key )
+{
+	char	pkey[512];
+	static	char value[4][512];	// use two buffers so compares
+								// work without stomping on each other
+	static	int	valueindex;
+	char	*o;
+	
+	valueindex = (valueindex + 1) % 4;
+	if (*s == '\\')
+		s++;
+	while (1)
+	{
+		o = pkey;
+		while (*s != '\\')
+		{
+			if (!*s)
+				return "";
+			*o++ = *s++;
+		}
+		*o = 0;
+		s++;
+
+		o = value[valueindex];
+
+		while (*s != '\\' && *s)
+		{
+			if (!*s)
+				return "";
+			*o++ = *s++;
+		}
+		*o = 0;
+
+		if (!stricmp(key, pkey) )
+			return value[valueindex];
+
+		if (!*s)
+			return "";
+		s++;
+	}
+}
+
+void Info_RemoveKey ( char *s, const char *key )
+{
+	char	*start;
+	char	pkey[512];
+	char	value[512];
+	char	*o;
+
+	if (strstr (key, "\\"))
+	{
+		return;
+	}
+
+	while (1)
+	{
+		start = s;
+		if (*s == '\\')
+			s++;
+		o = pkey;
+		while (*s != '\\')
+		{
+			if (!*s)
+				return;
+			*o++ = *s++;
+		}
+		*o = 0;
+		s++;
+
+		o = value;
+		while (*s != '\\' && *s)
+		{
+			if (!*s)
+				return;
+			*o++ = *s++;
+		}
+		*o = 0;
+
+		if (!stricmp (key, pkey) )
+		{
+			// This is safe because we're copying within the same string
+			Q_strcpy (start, s);	// remove this part
+			return;
+		}
+
+		if (!*s)
+			return;
+	}
+
+}
+
+void Info_RemovePrefixedKeys (char *start, char prefix)
+{
+	char	*s;
+	char	pkey[512];
+	char	value[512];
+	char	*o;
+
+	s = start;
+
+	while (1)
+	{
+		if (*s == '\\')
+			s++;
+		o = pkey;
+		while (*s != '\\')
+		{
+			if (!*s)
+				return;
+			*o++ = *s++;
+		}
+		*o = 0;
+		s++;
+
+		o = value;
+		while (*s != '\\' && *s)
+		{
+			if (!*s)
+				return;
+			*o++ = *s++;
+		}
+		*o = 0;
+
+		if (pkey[0] == prefix)
+		{
+			Info_RemoveKey (start, pkey);
+			s = start;
+		}
+
+		if (!*s)
+			return;
+	}
+}
+
+bool Info_IsKeyImportant( const char *key )
+{
+	if ( key[0] == '*' )
+		return true;
+	if ( !stricmp( key, "tracker" ) )
+		return true;
+
+	return false;
+}
+
+char *Info_FindLargestKey( char *s, int maxsize )
+{
+	char	key[256];
+	char	value[256];
+	char	*o;
+	int		l;
+	static char largest_key[256];
+	int     largest_size = 0;
+
+	*largest_key = 0;
+
+	if (*s == '\\')
+		s++;
+	while (*s)
+	{
+		int size = 0;
+
+		o = key;
+		while (*s && *s != '\\')
+			*o++ = *s++;
+
+		l = o - key;
+		*o = 0;
+		size = strlen( key );
+
+		if (!*s)
+		{
+			return largest_key;
+		}
+
+		o = value;
+		s++;
+		while (*s && *s != '\\')
+			*o++ = *s++;
+		*o = 0;
+
+		if (*s)
+			s++;
+
+		size += strlen( value );
+
+		if ( (size > largest_size) && !Info_IsKeyImportant(key) )
+		{
+			largest_size = size;
+			Q_strncpy( largest_key, key, sizeof( largest_key ) );
+		}
+	}
+
+	return largest_key;
+}
+
+void Info_SetValueForStarKey ( char *s, const char *key, const char *value, int maxsize )
+{
+	char	news[1024], *v;
+	int		c;
+
+	if (strstr (key, "\\") || strstr (value, "\\") )
+	{
+		return;
+	}
+
+	if (strstr (key, "..") || strstr (value, "..") )
+	{
+//		Con_Printf ("Can't use keys or values with a ..\n");
+		return;
+	}
+
+	if (strstr (key, "\"") || strstr (value, "\"") )
+	{
+		return;
+	}
+
+	if (strlen(key) > MAX_KV_LEN || strlen(value) > MAX_KV_LEN)
+	{
+		return;
+	}
+	Info_RemoveKey (s, key);
+	if (!value || !strlen(value))
+		return;
+
+	Q_snprintf (news, sizeof( news ), "\\%s\\%s", key, value);
+
+ 	if ( (int)(strlen(news) + strlen(s)) >= maxsize)
+	{
+		// no more room in buffer to add key/value
+		if ( Info_IsKeyImportant( key ) )
+		{
+			// keep removing the largest key/values until we have room
+			char *largekey;
+			do {
+				largekey = Info_FindLargestKey( s, maxsize );
+				Info_RemoveKey( s, largekey );
+			} while ( ((int)(strlen(news) + strlen(s)) >= maxsize) && *largekey != 0 );
+
+			if ( largekey[0] == 0 )
+			{
+				// no room to add setting
+				return;
+			}
+		}
+		else
+		{
+			// no room to add setting
+			return;
+		}
+	}
+
+	// only copy ascii values
+	s += strlen(s);
+	v = news;
+	while (*v)
+	{
+		c = (unsigned char)*v++;
+
+		// Strip out high ascii characters
+		c &= 127;
+
+		if (c > 13)
+		{
+			*s++ = c;
+		}
+	}
+	*s = 0;
+}
+
+void Info_SetValueForKey (char *s, const char *key, const char *value, int maxsize)
+{
+	if (key[0] == '*')
+	{
+		return;
+	}
+
+	Info_SetValueForStarKey (s, key, value, maxsize);
+}
+
+
+