Annotation of parser3/src/classes/math.C, revision 1.24.2.12
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:
1.24.2.12! paf 8: static const char* IDENT_MATH_C="$Date: 2003/03/05 11:57:36 $";
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:
1.24.2.12! paf 23: #ifdef HAVE_CRYPT
! 24: # ifdef HAVE_CRYPT_H
! 25: # include <crypt.h>
! 26: # endif
! 27: #else
! 28: extern char *crypt(const char *, const char *);
1.20 paf 29: #endif
30:
1.1 parser 31: // defines
32:
1.20 paf 33: #define MAX_SALT 8
1.1 parser 34:
35: // class
36:
1.24.2.8 paf 37: class MMath: public Methoded {
1.1 parser 38: public:
1.24.2.6 paf 39: MMath();
1.5 parser 40: void configure_admin(Request& r);
41:
1.1 parser 42: public: // Methoded
1.15 paf 43: bool used_directly() { return false; }
1.1 parser 44: };
45:
1.24.2.6 paf 46: // global variables
47:
1.24.2.10 paf 48: DECLARE_CLASS_VAR(math, 0 /*fictive*/, new MMath);
1.24.2.6 paf 49:
1.1 parser 50: // methods
1.5 parser 51: static unsigned int randomizer=0;
1.20 paf 52: static inline int _random(uint top) {
53: return (int)(((double)((randomizer=rand())% RAND_MAX)) / RAND_MAX * top );
54: }
1.24.2.9 paf 55: static void _random(Request& r, StringPtr method_name, MethodParams* params) {
1.1 parser 56: Pool& pool=r.pool();
57:
1.24.2.9 paf 58: ValuePtr range=params->as_junction(0, "range must be expression");
1.24.2.6 paf 59: double top=r.process_to_value(range)->as_double();
1.14 paf 60: if(top<=1)
1.16 paf 61: throw Exception("parser.runtime",
1.24.2.5 paf 62: method_name,
1.20 paf 63: "top must be above 1(%g)", top);
1.1 parser 64:
1.24.2.6 paf 65: r.write_no_lang(ValuePtr(new VInt(_random(uint(top)))));
1.1 parser 66: }
67:
68:
1.20 paf 69: typedef double(*math1_func_ptr)(double);
1.3 parser 70: static double frac(double param) { return param-trunc(param); }
71: static double degrees(double param) { return param /PI *180; }
72: static double radians(double param) { return param /180 *PI; }
1.1 parser 73:
74: static void math1(Request& r,
1.24.2.9 paf 75: StringPtr method_name, MethodParams* params,
1.1 parser 76: math1_func_ptr func) {
1.24.2.9 paf 77: ValuePtr param=params->as_junction(0, "parameter must be expression");
1.1 parser 78:
1.24.2.6 paf 79: double result=func(r.process_to_value(param)->as_double());
80: r.write_no_lang(ValuePtr(new VDouble(result)));
1.1 parser 81: }
82:
83: #define MATH1(name) \
1.24.2.9 paf 84: static void _##name(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 85: math1(r, method_name, params, &name);\
86: }
87: #define MATH1P(name_parser, name_c) \
1.24.2.9 paf 88: static void _##name_parser(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 89: math1(r, method_name, params, &name_c);\
90: }
91: MATH1(round); MATH1(floor); MATH1P(ceiling, ceil);
1.3 parser 92: MATH1(trunc); MATH1(frac);
1.1 parser 93: MATH1P(abs, fabs); MATH1(sign);
94: MATH1(exp); MATH1(log);
95: MATH1(sin); MATH1(asin);
96: MATH1(cos); MATH1(acos);
97: MATH1(tan); MATH1(atan);
1.3 parser 98: MATH1(degrees); MATH1(radians);
1.1 parser 99: MATH1(sqrt);
100:
101:
102: typedef double (*math2_func_ptr)(double, double);
103: static void math2(Request& r,
1.24.2.9 paf 104: StringPtr method_name, MethodParams* params,
1.1 parser 105: math2_func_ptr func) {
1.24.2.9 paf 106: ValuePtr a=params->as_junction(0, "parameter must be expression");
107: ValuePtr b=params->as_junction(1, "parameter must be expression");
1.1 parser 108:
1.24.2.6 paf 109: double result=func(
110: r.process_to_value(a)->as_double(),
111: r.process_to_value(b)->as_double());
112: r.write_no_lang(ValuePtr(new VDouble(result)));
1.1 parser 113: }
114:
115: #define MATH2(name) \
1.24.2.9 paf 116: static void _##name(Request& r, StringPtr method_name, MethodParams* params) {\
1.1 parser 117: math2(r, method_name, params, &name);\
118: }
119: MATH2(pow);
120:
1.20 paf 121: inline bool is_salt_body_char(int c) {
122: return isalnum(c) || c == '.' || c=='/';
123: }
1.24.2.2 paf 124: static size_t calc_prefix_size(const char* salt) {
1.20 paf 125: if(size_t salt_size=strlen(salt)) {
126: if(!is_salt_body_char(salt[0])) { // $... {...
1.24.2.2 paf 127: const char* cur=salt+1; // skip
1.20 paf 128: while(is_salt_body_char(*cur++)) // ...$ ...}
129: ;
130: return cur-salt;
131: } else
132: return 0;
133: } else
134: return 0;
135: }
1.24.2.9 paf 136: static void _crypt(Request& r, StringPtr method_name, MethodParams* params) {
1.19 paf 137: Pool& pool=r.pool();
1.24.2.9 paf 138: CharPtr password=params->as_string(0, "password must be string")->cstr();
139: CharPtr maybe_bodyless_salt=params->as_string(1, "salt must be string")->cstr();
1.20 paf 140:
141: size_t prefix_size=calc_prefix_size(maybe_bodyless_salt);
1.24.2.2 paf 142: const char* normal_salt;
1.20 paf 143: char normalize_buf[MAX_STRING];
144: if(prefix_size==strlen(maybe_bodyless_salt)) { // bodyless?
145: strncpy(normalize_buf, maybe_bodyless_salt, MAX_STRING-MAX_SALT-1);
146: char *cur=normalize_buf+strlen(normalize_buf);
147: // sould add up MAX_SALT random chars
148: static unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
149: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
150: for(int i=0; i<MAX_SALT; i++)
151: *cur++=itoa64[_random(64)];
152: *cur=0;
153: normal_salt=normalize_buf;
154: } else
155: normal_salt=maybe_bodyless_salt;
1.19 paf 156:
157: /* FreeBSD style MD5 string
158: */
1.20 paf 159: if(strncmp(normal_salt, PA_MD5PW_ID, PA_MD5PW_IDLEN) == 0) {
1.19 paf 160: const size_t sample_size=120;
1.24.2.6 paf 161: char *sample_buf=new(pool) char[sample_size];
162: pa_MD5Encode((const unsigned char *)password.get(),
1.20 paf 163: (const unsigned char *)normal_salt, sample_buf, sample_size);
1.24.2.6 paf 164: String sample(sample_buf);
165: r.write_pass_lang(sample);
1.20 paf 166: } else {
167: #ifdef HAVE_CRYPT
1.24.2.6 paf 168: const char* static_sample_buf=crypt(password, normal_salt);
169: if(!static_sample_buf // nothing generated
170: || !static_sample_buf[0] // generated nothing
171: || strncmp(static_sample_buf, normal_salt, prefix_size)!=0) // salt prefix not preserved
1.20 paf 172: throw Exception("parser.runtime",
1.24.2.5 paf 173: method_name,
1.21 paf 174: "on this platform does not support '%.*s' salt prefix", prefix_size, normal_salt);
1.20 paf 175:
1.24.2.11 paf 176: r.write_pass_lang(String(pool.copy(static_sample_buf)));
1.20 paf 177: #else
1.19 paf 178: throw Exception("parser.runtime",
1.24.2.5 paf 179: method_name,
1.19 paf 180: "salt must start with '" PA_MD5PW_ID "'");
1.20 paf 181: #endif
182: }
1.19 paf 183: }
184:
1.1 parser 185: // constructor
186:
1.24.2.6 paf 187: MMath::MMath(): Methoded("math") {
1.1 parser 188: // ^FUNC(expr)
189: #define ADD1(name) \
190: add_native_method(#name, Method::CT_STATIC, _##name, 1, 1)
191:
192: ADD1(round); ADD1(floor); ADD1(ceiling);
1.3 parser 193: ADD1(trunc); ADD1(frac);
1.1 parser 194: ADD1(abs); ADD1(sign);
195: ADD1(exp); ADD1(log);
196: ADD1(sin); ADD1(asin);
197: ADD1(cos); ADD1(acos);
198: ADD1(tan); ADD1(atan);
1.3 parser 199: ADD1(degrees); ADD1(radians);
1.1 parser 200: ADD1(sqrt);
1.3 parser 201: ADD1(random);
1.1 parser 202:
203: #define ADD2(name) \
204: add_native_method(#name, Method::CT_STATIC, _##name, 2, 2)
205:
206: // ^pow(x;y)
207: ADD2(pow);
208:
1.19 paf 209: // ^crypt[password;salt]
210: ADD2(crypt);
1.5 parser 211: }
212:
213: // in MSVC each thread has it's own pseudo-random sequence
214: // in win32 apache each thread can handle multiple requests
215: // so to get proper randoms we remember random generated in one thread
216: void MMath::configure_admin(Request&) {
217: // setting seed
218: srand(
1.14 paf 219: randomizer
1.5 parser 220: #ifdef WIN32
1.14 paf 221: ^ GetCurrentThreadId()
1.5 parser 222: #else
1.14 paf 223: ^ getpid()
1.5 parser 224: #endif
1.20 paf 225: ^(unsigned int)time(NULL)
1.5 parser 226: );
227: if(!randomizer)
228: randomizer=rand();
1.1 parser 229: }
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