--- parser3/src/classes/math.C	2001/11/01 16:41:52	1.8
+++ parser3/src/classes/math.C	2003/04/14 14:59:29	1.26
@@ -1,26 +1,31 @@
 /** @file
 	Parser: @b math parser class.
 
-	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
-	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
-
-	$Id: math.C,v 1.8 2001/11/01 16:41:52 paf Exp $
+	Copyright(c) 2001, 2003 ArtLebedev Group(http://www.artlebedev.com)
+	Author: Alexandr Petrosian <paf@design.ru>(http://paf.design.ru)
 */
 
-#include "pa_config_includes.h"
+static const char* IDENT_MATH_C="$Date: 2003/04/14 14:59:29 $";
+
 #include "pa_common.h"
 #include "pa_vint.h"
 #include "pa_vmath.h"
 #include "pa_request.h"
+#include "pa_md5.h"
 
 #ifdef WIN32
+// for threadID
 #	include <windows.h>
 #endif
 
+#ifdef HAVE_CRYPT_H
+#include <crypt.h>
+#endif
+
 // defines
 
 #define PI 3.1415926535
-#define MATH_CLASS_NAME "math"
+#define MAX_SALT 8
 
 // class
 
@@ -30,29 +35,29 @@ public:
 	void configure_admin(Request& r);
 
 public: // Methoded
-	bool used_directly() { return true; }
+	bool used_directly() { return false; }
 };
 
 // methods
 static unsigned int randomizer=0;
+static inline int _random(uint top) {
+	return (int)(((double)((randomizer=rand())% RAND_MAX)) / RAND_MAX * top );
+}
 static void _random(Request& r, const String& method_name, MethodParams *params) {
 	Pool& pool=r.pool();
 
 	Value& range=params->as_junction(0, "range must be expression");
-    uint max=(uint)r.process(range).as_double();
-    if(max<=1)
-		throw Exception(0, 0,
+	double top=r.process_to_value(range).as_double();
+	if(top<=0)
+		throw Exception("parser.runtime",
 			&method_name,
-			"bad range [0..%u]", max);
+			"top must be above 0(%g)", top);
 	
-	Value& result=*new(pool) VInt(pool, (int)(
-		((double)((randomizer=rand())% RAND_MAX)) / RAND_MAX * (max + 1)));
-	result.set_name(method_name);
-	r.write_no_lang(result);
+	r.write_no_lang(*new(pool) VInt(pool, _random(uint(top))));
 }
 
 
-typedef double (*math1_func_ptr)(double);
+typedef double(*math1_func_ptr)(double);
 static double frac(double param) { return param-trunc(param); }
 static double degrees(double param) { return param /PI *180; }
 static double radians(double param) { return param /180 *PI; }
@@ -63,9 +68,8 @@ static void math1(Request& r,
 	Pool& pool=r.pool();
 	Value& param=params->as_junction(0, "parameter must be expression");
 
-	Value& result=*new(pool) VDouble(pool, (*func)(r.process(param).as_double()));
-	result.set_name(method_name);
-	r.write_no_lang(result);
+	double result=(*func)(r.process_to_value(param).as_double());
+	r.write_no_lang(*new(pool) VDouble(pool, result));
 }
 
 #define MATH1(name) \
@@ -95,11 +99,10 @@ static void math2(Request& r,
 	Value& a=params->as_junction(0, "parameter must be expression");
 	Value& b=params->as_junction(1, "parameter must be expression");
 
-	Value& result=*new(pool) VDouble(pool, (*func)(
-		r.process(a).as_double(),
-		r.process(b).as_double()));
-	result.set_name(method_name);
-	r.write_no_lang(result);
+	double result=(*func)(
+		r.process_to_value(a).as_double(),
+		r.process_to_value(b).as_double());
+	r.write_no_lang(*new(pool) VDouble(pool, result));
 }
 
 #define MATH2(name) \
@@ -108,11 +111,95 @@ static void math2(Request& r,
 	}
 MATH2(pow);
 
+inline bool is_salt_body_char(int c) {
+	return isalnum(c) || c == '.' || c=='/';
+}
+static size_t calc_prefix_size(const char *salt) {
+	if(size_t salt_size=strlen(salt)) {
+		if(!is_salt_body_char(salt[0])) { // $...  {...
+			const char *cur=salt+1; // skip
+			while(is_salt_body_char(*cur++)) // ...$  ...}
+				;
+			return cur-salt;
+		} else
+			return 0;
+	} else
+		return 0;
+}
+static void _crypt(Request& r, const String& method_name, MethodParams *params) {
+	Pool& pool=r.pool();
+	const char *password=params->as_string(0, "password must be string").cstr();
+	const char *maybe_bodyless_salt=params->as_string(1, "salt must be string").cstr();
+
+	size_t prefix_size=calc_prefix_size(maybe_bodyless_salt);
+	const char *normal_salt;
+	char normalize_buf[MAX_STRING];
+	if(prefix_size==strlen(maybe_bodyless_salt)) { // bodyless?
+		strncpy(normalize_buf, maybe_bodyless_salt, MAX_STRING-MAX_SALT-1);
+		char *cur=normalize_buf+strlen(normalize_buf);
+		// sould add up MAX_SALT random chars
+		static unsigned char itoa64[] =         /* 0 ... 63 => ASCII - 64 */
+		"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+		for(int i=0; i<MAX_SALT; i++)
+			*cur++=itoa64[_random(64)];
+		*cur=0;
+		normal_salt=normalize_buf;
+	} else
+		normal_salt=maybe_bodyless_salt;
+
+    /* FreeBSD style MD5 string 
+     */
+    if(strncmp(normal_salt, PA_MD5PW_ID, PA_MD5PW_IDLEN) == 0) {
+		const size_t sample_size=120;
+		char *sample_buf=(char *)pool.malloc(sample_size);
+		pa_MD5Encode((const unsigned char *)password,
+			(const unsigned char *)normal_salt, 1/*TRUE: mix in magic string*/,
+			sample_buf, sample_size,
+			0, 0);
+		r.write_pass_lang(*new(pool) String(pool, sample_buf));
+    } else {
+#ifdef HAVE_CRYPT
+		const char *sample_buf=crypt(password, normal_salt);
+		if(!sample_buf  // nothing generated
+			|| !sample_buf[0] // generated nothing
+			|| strncmp(sample_buf, normal_salt, prefix_size)!=0) // salt prefix not preserved
+			throw Exception("parser.runtime",
+				&method_name,
+				"on this platform does not support '%.*s' salt prefix", prefix_size, normal_salt);
+		
+		r.write_pass_lang(*new(pool) String(pool, sample_buf));
+#else
+		throw Exception("parser.runtime",
+			&method_name,
+			"salt must start with '" PA_MD5PW_ID "'");
+#endif
+	}
+}
+
+static void _md5(Request& r, const String& method_name, MethodParams *params) {
+	Pool& pool=r.pool();
+	const char *string=params->as_string(0, "parameter must be string").cstr();
+	const size_t sample_size=120;
+	char sample_buf[sample_size];
+	const int sample_bytes_count=12;
+	unsigned char sample_bytes[sample_bytes_count];
+	pa_MD5Encode((const unsigned char *)string,
+		(const unsigned char *)"",  0/*FALSE: mix in magic string*/,
+		sample_buf, sample_size,
+		sample_bytes, sample_bytes_count);
+	char *sample_bytes_hex=(char *)pool.malloc(sample_bytes_count*2/*byte->hh*/+1/*for zero-teminator*/);
+	unsigned char *src=sample_bytes;
+	unsigned char *end=sample_bytes+sample_bytes_count;
+	char *dest=sample_bytes_hex;
+	while(src<end)
+		dest+=snprintf(dest, 3, "%02x", *src++);
+
+	r.write_pass_lang(*new(pool) String(pool, sample_bytes_hex));
+}
+
 // constructor
 
-MMath::MMath(Pool& apool) : Methoded(apool) {
-	set_name(*NEW String(pool(), MATH_CLASS_NAME));
-	
+MMath::MMath(Pool& apool) : Methoded(apool, "math") {
 	// ^FUNC(expr)	
 #define ADD1(name) \
 	add_native_method(#name, Method::CT_STATIC, _##name, 1, 1)
@@ -134,6 +221,11 @@ MMath::MMath(Pool& apool) : Methoded(apo
 	// ^pow(x;y)
 	ADD2(pow);
 
+	// ^crypt[password;salt]
+	ADD2(crypt);
+
+	// ^md5[string]
+	ADD1(md5);
 }
 
 // in MSVC each thread has it's own pseudo-random sequence
@@ -142,13 +234,13 @@ MMath::MMath(Pool& apool) : Methoded(apo
 void MMath::configure_admin(Request&) {
 	// setting seed
 	srand(
-		randomizer ^
+		randomizer
 #ifdef WIN32
-		GetCurrentThreadId() ^
+		^ GetCurrentThreadId()
 #else
-		getpid() ^
+		^ getpid()
 #endif
-		(unsigned int)time(NULL)
+		^(unsigned int)time(NULL)
 	);
 	if(!randomizer)
 		randomizer=rand();