Annotation of parser3/src/classes/math.C, revision 1.24.2.9
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:
1.24.2.9! paf 8: static const char* IDENT_MATH_C="$Date: 2003/02/17 17:05:02 $";
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:
1.24.2.7 paf 44: MethodedPtr math_class(0); // fictive
45: MethodedPtr math_base_class(new MMath);
1.24.2.6 paf 46:
1.1 parser 47: // methods
1.5 parser 48: static unsigned int randomizer=0;
1.20 paf 49: static inline int _random(uint top) {
50: return (int)(((double)((randomizer=rand())% RAND_MAX)) / RAND_MAX * top );
51: }
1.24.2.9! paf 52: static void _random(Request& r, StringPtr method_name, MethodParams* params) {
1.1 parser 53: Pool& pool=r.pool();
54:
1.24.2.9! paf 55: ValuePtr range=params->as_junction(0, "range must be expression");
1.24.2.6 paf 56: double top=r.process_to_value(range)->as_double();
1.14 paf 57: if(top<=1)
1.16 paf 58: throw Exception("parser.runtime",
1.24.2.5 paf 59: method_name,
1.20 paf 60: "top must be above 1(%g)", top);
1.1 parser 61:
1.24.2.6 paf 62: r.write_no_lang(ValuePtr(new VInt(_random(uint(top)))));
1.1 parser 63: }
64:
65:
1.20 paf 66: typedef double(*math1_func_ptr)(double);
1.3 parser 67: static double frac(double param) { return param-trunc(param); }
68: static double degrees(double param) { return param /PI *180; }
69: static double radians(double param) { return param /180 *PI; }
1.1 parser 70:
71: static void math1(Request& r,
1.24.2.9! paf 72: StringPtr method_name, MethodParams* params,
1.1 parser 73: math1_func_ptr func) {
1.24.2.9! paf 74: ValuePtr param=params->as_junction(0, "parameter must be expression");
1.1 parser 75:
1.24.2.6 paf 76: double result=func(r.process_to_value(param)->as_double());
77: r.write_no_lang(ValuePtr(new VDouble(result)));
1.1 parser 78: }
79:
80: #define MATH1(name) \
1.24.2.9! paf 81: static void _##name(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 82: math1(r, method_name, params, &name);\
83: }
84: #define MATH1P(name_parser, name_c) \
1.24.2.9! paf 85: static void _##name_parser(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 86: math1(r, method_name, params, &name_c);\
87: }
88: MATH1(round); MATH1(floor); MATH1P(ceiling, ceil);
1.3 parser 89: MATH1(trunc); MATH1(frac);
1.1 parser 90: MATH1P(abs, fabs); MATH1(sign);
91: MATH1(exp); MATH1(log);
92: MATH1(sin); MATH1(asin);
93: MATH1(cos); MATH1(acos);
94: MATH1(tan); MATH1(atan);
1.3 parser 95: MATH1(degrees); MATH1(radians);
1.1 parser 96: MATH1(sqrt);
97:
98:
99: typedef double (*math2_func_ptr)(double, double);
100: static void math2(Request& r,
1.24.2.9! paf 101: StringPtr method_name, MethodParams* params,
1.1 parser 102: math2_func_ptr func) {
1.24.2.9! paf 103: ValuePtr a=params->as_junction(0, "parameter must be expression");
! 104: ValuePtr b=params->as_junction(1, "parameter must be expression");
1.1 parser 105:
1.24.2.6 paf 106: double result=func(
107: r.process_to_value(a)->as_double(),
108: r.process_to_value(b)->as_double());
109: r.write_no_lang(ValuePtr(new VDouble(result)));
1.1 parser 110: }
111:
112: #define MATH2(name) \
1.24.2.9! paf 113: static void _##name(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 114: math2(r, method_name, params, &name);\
115: }
116: MATH2(pow);
117:
1.20 paf 118: inline bool is_salt_body_char(int c) {
119: return isalnum(c) || c == '.' || c=='/';
120: }
1.24.2.2 paf 121: static size_t calc_prefix_size(const char* salt) {
1.20 paf 122: if(size_t salt_size=strlen(salt)) {
123: if(!is_salt_body_char(salt[0])) { // $... {...
1.24.2.2 paf 124: const char* cur=salt+1; // skip
1.20 paf 125: while(is_salt_body_char(*cur++)) // ...$ ...}
126: ;
127: return cur-salt;
128: } else
129: return 0;
130: } else
131: return 0;
132: }
1.24.2.9! paf 133: static void _crypt(Request& r, StringPtr method_name, MethodParams* params) {
1.19 paf 134: Pool& pool=r.pool();
1.24.2.9! paf 135: CharPtr password=params->as_string(0, "password must be string")->cstr();
! 136: CharPtr maybe_bodyless_salt=params->as_string(1, "salt must be string")->cstr();
1.20 paf 137:
138: size_t prefix_size=calc_prefix_size(maybe_bodyless_salt);
1.24.2.2 paf 139: const char* normal_salt;
1.20 paf 140: char normalize_buf[MAX_STRING];
141: if(prefix_size==strlen(maybe_bodyless_salt)) { // bodyless?
142: strncpy(normalize_buf, maybe_bodyless_salt, MAX_STRING-MAX_SALT-1);
143: char *cur=normalize_buf+strlen(normalize_buf);
144: // sould add up MAX_SALT random chars
145: static unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
146: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
147: for(int i=0; i<MAX_SALT; i++)
148: *cur++=itoa64[_random(64)];
149: *cur=0;
150: normal_salt=normalize_buf;
151: } else
152: normal_salt=maybe_bodyless_salt;
1.19 paf 153:
154: /* FreeBSD style MD5 string
155: */
1.20 paf 156: if(strncmp(normal_salt, PA_MD5PW_ID, PA_MD5PW_IDLEN) == 0) {
1.19 paf 157: const size_t sample_size=120;
1.24.2.6 paf 158: char *sample_buf=new(pool) char[sample_size];
159: pa_MD5Encode((const unsigned char *)password.get(),
1.20 paf 160: (const unsigned char *)normal_salt, sample_buf, sample_size);
1.24.2.6 paf 161: String sample(sample_buf);
162: r.write_pass_lang(sample);
1.20 paf 163: } else {
164: #ifdef HAVE_CRYPT
1.24.2.6 paf 165: const char* static_sample_buf=crypt(password, normal_salt);
166: if(!static_sample_buf // nothing generated
167: || !static_sample_buf[0] // generated nothing
168: || strncmp(static_sample_buf, normal_salt, prefix_size)!=0) // salt prefix not preserved
1.20 paf 169: throw Exception("parser.runtime",
1.24.2.5 paf 170: method_name,
1.21 paf 171: "on this platform does not support '%.*s' salt prefix", prefix_size, normal_salt);
1.20 paf 172:
1.24.2.6 paf 173: r.write_pass_lang(StringPtr(new String(pool.copy(static_sample_buf))));
1.20 paf 174: #else
1.19 paf 175: throw Exception("parser.runtime",
1.24.2.5 paf 176: method_name,
1.19 paf 177: "salt must start with '" PA_MD5PW_ID "'");
1.20 paf 178: #endif
179: }
1.19 paf 180: }
181:
1.1 parser 182: // constructor
183:
1.24.2.6 paf 184: MMath::MMath(): Methoded("math") {
1.1 parser 185: // ^FUNC(expr)
186: #define ADD1(name) \
187: add_native_method(#name, Method::CT_STATIC, _##name, 1, 1)
188:
189: ADD1(round); ADD1(floor); ADD1(ceiling);
1.3 parser 190: ADD1(trunc); ADD1(frac);
1.1 parser 191: ADD1(abs); ADD1(sign);
192: ADD1(exp); ADD1(log);
193: ADD1(sin); ADD1(asin);
194: ADD1(cos); ADD1(acos);
195: ADD1(tan); ADD1(atan);
1.3 parser 196: ADD1(degrees); ADD1(radians);
1.1 parser 197: ADD1(sqrt);
1.3 parser 198: ADD1(random);
1.1 parser 199:
200: #define ADD2(name) \
201: add_native_method(#name, Method::CT_STATIC, _##name, 2, 2)
202:
203: // ^pow(x;y)
204: ADD2(pow);
205:
1.19 paf 206: // ^crypt[password;salt]
207: ADD2(crypt);
1.5 parser 208: }
209:
210: // in MSVC each thread has it's own pseudo-random sequence
211: // in win32 apache each thread can handle multiple requests
212: // so to get proper randoms we remember random generated in one thread
213: void MMath::configure_admin(Request&) {
214: // setting seed
215: srand(
1.14 paf 216: randomizer
1.5 parser 217: #ifdef WIN32
1.14 paf 218: ^ GetCurrentThreadId()
1.5 parser 219: #else
1.14 paf 220: ^ getpid()
1.5 parser 221: #endif
1.20 paf 222: ^(unsigned int)time(NULL)
1.5 parser 223: );
224: if(!randomizer)
225: randomizer=rand();
1.1 parser 226: }
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