Annotation of parser3/src/classes/math.C, revision 1.24.2.10
1.1 parser 1: /** @file
2: Parser: @b math parser class.
3:
1.24.2.2 paf 4: Copyright(c) 2001-2003 ArtLebedev Group(http://www.artlebedev.com)
1.20 paf 5: Author: Alexandr Petrosian <paf@design.ru>(http://paf.design.ru)
1.22 paf 6: */
1.1 parser 7:
1.24.2.10! paf 8: static const char* IDENT_MATH_C="$Date: 2003/02/20 14:53:33 $";
1.24.2.4 paf 9:
10: #include "pa_vmethod_frame.h"
1.1 parser 11:
12: #include "pa_common.h"
13: #include "pa_vint.h"
1.2 parser 14: #include "pa_vmath.h"
1.1 parser 15: #include "pa_request.h"
1.19 paf 16: #include "pa_md5.h"
1.1 parser 17:
1.5 parser 18: #ifdef WIN32
1.19 paf 19: // for threadID
1.5 parser 20: # include <windows.h>
21: #endif
22:
1.20 paf 23: #ifdef HAVE_CRYPT_H
24: #include <crypt.h>
25: #endif
26:
1.1 parser 27: // defines
28:
1.20 paf 29: #define MAX_SALT 8
1.1 parser 30:
31: // class
32:
1.24.2.8 paf 33: class MMath: public Methoded {
1.1 parser 34: public:
1.24.2.6 paf 35: MMath();
1.5 parser 36: void configure_admin(Request& r);
37:
1.1 parser 38: public: // Methoded
1.15 paf 39: bool used_directly() { return false; }
1.1 parser 40: };
41:
1.24.2.6 paf 42: // global variables
43:
1.24.2.10! paf 44: DECLARE_CLASS_VAR(math, 0 /*fictive*/, new MMath);
1.24.2.6 paf 45:
1.1 parser 46: // methods
1.5 parser 47: static unsigned int randomizer=0;
1.20 paf 48: static inline int _random(uint top) {
49: return (int)(((double)((randomizer=rand())% RAND_MAX)) / RAND_MAX * top );
50: }
1.24.2.9 paf 51: static void _random(Request& r, StringPtr method_name, MethodParams* params) {
1.1 parser 52: Pool& pool=r.pool();
53:
1.24.2.9 paf 54: ValuePtr range=params->as_junction(0, "range must be expression");
1.24.2.6 paf 55: double top=r.process_to_value(range)->as_double();
1.14 paf 56: if(top<=1)
1.16 paf 57: throw Exception("parser.runtime",
1.24.2.5 paf 58: method_name,
1.20 paf 59: "top must be above 1(%g)", top);
1.1 parser 60:
1.24.2.6 paf 61: r.write_no_lang(ValuePtr(new VInt(_random(uint(top)))));
1.1 parser 62: }
63:
64:
1.20 paf 65: typedef double(*math1_func_ptr)(double);
1.3 parser 66: static double frac(double param) { return param-trunc(param); }
67: static double degrees(double param) { return param /PI *180; }
68: static double radians(double param) { return param /180 *PI; }
1.1 parser 69:
70: static void math1(Request& r,
1.24.2.9 paf 71: StringPtr method_name, MethodParams* params,
1.1 parser 72: math1_func_ptr func) {
1.24.2.9 paf 73: ValuePtr param=params->as_junction(0, "parameter must be expression");
1.1 parser 74:
1.24.2.6 paf 75: double result=func(r.process_to_value(param)->as_double());
76: r.write_no_lang(ValuePtr(new VDouble(result)));
1.1 parser 77: }
78:
79: #define MATH1(name) \
1.24.2.9 paf 80: static void _##name(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 81: math1(r, method_name, params, &name);\
82: }
83: #define MATH1P(name_parser, name_c) \
1.24.2.9 paf 84: static void _##name_parser(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 85: math1(r, method_name, params, &name_c);\
86: }
87: MATH1(round); MATH1(floor); MATH1P(ceiling, ceil);
1.3 parser 88: MATH1(trunc); MATH1(frac);
1.1 parser 89: MATH1P(abs, fabs); MATH1(sign);
90: MATH1(exp); MATH1(log);
91: MATH1(sin); MATH1(asin);
92: MATH1(cos); MATH1(acos);
93: MATH1(tan); MATH1(atan);
1.3 parser 94: MATH1(degrees); MATH1(radians);
1.1 parser 95: MATH1(sqrt);
96:
97:
98: typedef double (*math2_func_ptr)(double, double);
99: static void math2(Request& r,
1.24.2.9 paf 100: StringPtr method_name, MethodParams* params,
1.1 parser 101: math2_func_ptr func) {
1.24.2.9 paf 102: ValuePtr a=params->as_junction(0, "parameter must be expression");
103: ValuePtr b=params->as_junction(1, "parameter must be expression");
1.1 parser 104:
1.24.2.6 paf 105: double result=func(
106: r.process_to_value(a)->as_double(),
107: r.process_to_value(b)->as_double());
108: r.write_no_lang(ValuePtr(new VDouble(result)));
1.1 parser 109: }
110:
111: #define MATH2(name) \
1.24.2.9 paf 112: static void _##name(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 113: math2(r, method_name, params, &name);\
114: }
115: MATH2(pow);
116:
1.20 paf 117: inline bool is_salt_body_char(int c) {
118: return isalnum(c) || c == '.' || c=='/';
119: }
1.24.2.2 paf 120: static size_t calc_prefix_size(const char* salt) {
1.20 paf 121: if(size_t salt_size=strlen(salt)) {
122: if(!is_salt_body_char(salt[0])) { // $... {...
1.24.2.2 paf 123: const char* cur=salt+1; // skip
1.20 paf 124: while(is_salt_body_char(*cur++)) // ...$ ...}
125: ;
126: return cur-salt;
127: } else
128: return 0;
129: } else
130: return 0;
131: }
1.24.2.9 paf 132: static void _crypt(Request& r, StringPtr method_name, MethodParams* params) {
1.19 paf 133: Pool& pool=r.pool();
1.24.2.9 paf 134: CharPtr password=params->as_string(0, "password must be string")->cstr();
135: CharPtr maybe_bodyless_salt=params->as_string(1, "salt must be string")->cstr();
1.20 paf 136:
137: size_t prefix_size=calc_prefix_size(maybe_bodyless_salt);
1.24.2.2 paf 138: const char* normal_salt;
1.20 paf 139: char normalize_buf[MAX_STRING];
140: if(prefix_size==strlen(maybe_bodyless_salt)) { // bodyless?
141: strncpy(normalize_buf, maybe_bodyless_salt, MAX_STRING-MAX_SALT-1);
142: char *cur=normalize_buf+strlen(normalize_buf);
143: // sould add up MAX_SALT random chars
144: static unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
145: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
146: for(int i=0; i<MAX_SALT; i++)
147: *cur++=itoa64[_random(64)];
148: *cur=0;
149: normal_salt=normalize_buf;
150: } else
151: normal_salt=maybe_bodyless_salt;
1.19 paf 152:
153: /* FreeBSD style MD5 string
154: */
1.20 paf 155: if(strncmp(normal_salt, PA_MD5PW_ID, PA_MD5PW_IDLEN) == 0) {
1.19 paf 156: const size_t sample_size=120;
1.24.2.6 paf 157: char *sample_buf=new(pool) char[sample_size];
158: pa_MD5Encode((const unsigned char *)password.get(),
1.20 paf 159: (const unsigned char *)normal_salt, sample_buf, sample_size);
1.24.2.6 paf 160: String sample(sample_buf);
161: r.write_pass_lang(sample);
1.20 paf 162: } else {
163: #ifdef HAVE_CRYPT
1.24.2.6 paf 164: const char* static_sample_buf=crypt(password, normal_salt);
165: if(!static_sample_buf // nothing generated
166: || !static_sample_buf[0] // generated nothing
167: || strncmp(static_sample_buf, normal_salt, prefix_size)!=0) // salt prefix not preserved
1.20 paf 168: throw Exception("parser.runtime",
1.24.2.5 paf 169: method_name,
1.21 paf 170: "on this platform does not support '%.*s' salt prefix", prefix_size, normal_salt);
1.20 paf 171:
1.24.2.6 paf 172: r.write_pass_lang(StringPtr(new String(pool.copy(static_sample_buf))));
1.20 paf 173: #else
1.19 paf 174: throw Exception("parser.runtime",
1.24.2.5 paf 175: method_name,
1.19 paf 176: "salt must start with '" PA_MD5PW_ID "'");
1.20 paf 177: #endif
178: }
1.19 paf 179: }
180:
1.1 parser 181: // constructor
182:
1.24.2.6 paf 183: MMath::MMath(): Methoded("math") {
1.1 parser 184: // ^FUNC(expr)
185: #define ADD1(name) \
186: add_native_method(#name, Method::CT_STATIC, _##name, 1, 1)
187:
188: ADD1(round); ADD1(floor); ADD1(ceiling);
1.3 parser 189: ADD1(trunc); ADD1(frac);
1.1 parser 190: ADD1(abs); ADD1(sign);
191: ADD1(exp); ADD1(log);
192: ADD1(sin); ADD1(asin);
193: ADD1(cos); ADD1(acos);
194: ADD1(tan); ADD1(atan);
1.3 parser 195: ADD1(degrees); ADD1(radians);
1.1 parser 196: ADD1(sqrt);
1.3 parser 197: ADD1(random);
1.1 parser 198:
199: #define ADD2(name) \
200: add_native_method(#name, Method::CT_STATIC, _##name, 2, 2)
201:
202: // ^pow(x;y)
203: ADD2(pow);
204:
1.19 paf 205: // ^crypt[password;salt]
206: ADD2(crypt);
1.5 parser 207: }
208:
209: // in MSVC each thread has it's own pseudo-random sequence
210: // in win32 apache each thread can handle multiple requests
211: // so to get proper randoms we remember random generated in one thread
212: void MMath::configure_admin(Request&) {
213: // setting seed
214: srand(
1.14 paf 215: randomizer
1.5 parser 216: #ifdef WIN32
1.14 paf 217: ^ GetCurrentThreadId()
1.5 parser 218: #else
1.14 paf 219: ^ getpid()
1.5 parser 220: #endif
1.20 paf 221: ^(unsigned int)time(NULL)
1.5 parser 222: );
223: if(!randomizer)
224: randomizer=rand();
1.1 parser 225: }
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