Annotation of parser3/src/classes/math.C, revision 1.22
1.1 parser 1: /** @file
2: Parser: @b math parser class.
3:
1.20 paf 4: Copyright(c) 2001, 2002 ArtLebedev Group(http://www.artlebedev.com)
5: Author: Alexandr Petrosian <paf@design.ru>(http://paf.design.ru)
1.22 ! paf 6: */
1.1 parser 7:
1.22 ! paf 8: static const char* IDENT_MATH_C="$Id: zzz $";
1.1 parser 9:
10: #include "pa_common.h"
11: #include "pa_vint.h"
1.2 parser 12: #include "pa_vmath.h"
1.1 parser 13: #include "pa_request.h"
1.19 paf 14: #include "pa_md5.h"
1.1 parser 15:
1.5 parser 16: #ifdef WIN32
1.19 paf 17: // for threadID
1.5 parser 18: # include <windows.h>
19: #endif
20:
1.20 paf 21: #ifdef HAVE_CRYPT_H
22: #include <crypt.h>
23: #endif
24:
1.1 parser 25: // defines
26:
1.3 parser 27: #define PI 3.1415926535
1.20 paf 28: #define MAX_SALT 8
1.1 parser 29:
30: // class
31:
32: class MMath : public Methoded {
33: public:
34: MMath(Pool& pool);
1.5 parser 35: void configure_admin(Request& r);
36:
1.1 parser 37: public: // Methoded
1.15 paf 38: bool used_directly() { return false; }
1.1 parser 39: };
40:
41: // methods
1.5 parser 42: static unsigned int randomizer=0;
1.20 paf 43: static inline int _random(uint top) {
44: return (int)(((double)((randomizer=rand())% RAND_MAX)) / RAND_MAX * top );
45: }
1.1 parser 46: static void _random(Request& r, const String& method_name, MethodParams *params) {
47: Pool& pool=r.pool();
48:
1.3 parser 49: Value& range=params->as_junction(0, "range must be expression");
1.17 paf 50: double top=r.process_to_value(range).as_double();
1.14 paf 51: if(top<=1)
1.16 paf 52: throw Exception("parser.runtime",
1.1 parser 53: &method_name,
1.20 paf 54: "top must be above 1(%g)", top);
1.1 parser 55:
1.20 paf 56: r.write_no_lang(*new(pool) VInt(pool, _random(uint(top))));
1.1 parser 57: }
58:
59:
1.20 paf 60: typedef double(*math1_func_ptr)(double);
1.3 parser 61: static double frac(double param) { return param-trunc(param); }
62: static double degrees(double param) { return param /PI *180; }
63: static double radians(double param) { return param /180 *PI; }
1.1 parser 64:
65: static void math1(Request& r,
66: const String& method_name, MethodParams *params,
67: math1_func_ptr func) {
68: Pool& pool=r.pool();
1.3 parser 69: Value& param=params->as_junction(0, "parameter must be expression");
1.1 parser 70:
1.18 paf 71: double result=(*func)(r.process_to_value(param).as_double());
72: r.write_no_lang(*new(pool) VDouble(pool, result));
1.1 parser 73: }
74:
75: #define MATH1(name) \
76: static void _##name(Request& r, const String& method_name, MethodParams *params) {\
77: math1(r, method_name, params, &name);\
78: }
79: #define MATH1P(name_parser, name_c) \
80: static void _##name_parser(Request& r, const String& method_name, MethodParams *params) {\
81: math1(r, method_name, params, &name_c);\
82: }
83: MATH1(round); MATH1(floor); MATH1P(ceiling, ceil);
1.3 parser 84: MATH1(trunc); MATH1(frac);
1.1 parser 85: MATH1P(abs, fabs); MATH1(sign);
86: MATH1(exp); MATH1(log);
87: MATH1(sin); MATH1(asin);
88: MATH1(cos); MATH1(acos);
89: MATH1(tan); MATH1(atan);
1.3 parser 90: MATH1(degrees); MATH1(radians);
1.1 parser 91: MATH1(sqrt);
92:
93:
94: typedef double (*math2_func_ptr)(double, double);
95: static void math2(Request& r,
96: const String& method_name, MethodParams *params,
97: math2_func_ptr func) {
98: Pool& pool=r.pool();
1.3 parser 99: Value& a=params->as_junction(0, "parameter must be expression");
100: Value& b=params->as_junction(1, "parameter must be expression");
1.1 parser 101:
1.18 paf 102: double result=(*func)(
1.17 paf 103: r.process_to_value(a).as_double(),
1.18 paf 104: r.process_to_value(b).as_double());
105: r.write_no_lang(*new(pool) VDouble(pool, result));
1.1 parser 106: }
107:
108: #define MATH2(name) \
109: static void _##name(Request& r, const String& method_name, MethodParams *params) {\
110: math2(r, method_name, params, &name);\
111: }
112: MATH2(pow);
113:
1.20 paf 114: inline bool is_salt_body_char(int c) {
115: return isalnum(c) || c == '.' || c=='/';
116: }
117: static size_t calc_prefix_size(const char *salt) {
118: if(size_t salt_size=strlen(salt)) {
119: if(!is_salt_body_char(salt[0])) { // $... {...
120: const char *cur=salt+1; // skip
121: while(is_salt_body_char(*cur++)) // ...$ ...}
122: ;
123: return cur-salt;
124: } else
125: return 0;
126: } else
127: return 0;
128: }
1.19 paf 129: static void _crypt(Request& r, const String& method_name, MethodParams *params) {
130: Pool& pool=r.pool();
131: const char *password=params->as_string(0, "password must be string").cstr();
1.20 paf 132: const char *maybe_bodyless_salt=params->as_string(1, "salt must be string").cstr();
133:
134: size_t prefix_size=calc_prefix_size(maybe_bodyless_salt);
135: const char *normal_salt;
136: char normalize_buf[MAX_STRING];
137: if(prefix_size==strlen(maybe_bodyless_salt)) { // bodyless?
138: strncpy(normalize_buf, maybe_bodyless_salt, MAX_STRING-MAX_SALT-1);
139: char *cur=normalize_buf+strlen(normalize_buf);
140: // sould add up MAX_SALT random chars
141: static unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
142: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
143: for(int i=0; i<MAX_SALT; i++)
144: *cur++=itoa64[_random(64)];
145: *cur=0;
146: normal_salt=normalize_buf;
147: } else
148: normal_salt=maybe_bodyless_salt;
1.19 paf 149:
150: /* FreeBSD style MD5 string
151: */
1.20 paf 152: if(strncmp(normal_salt, PA_MD5PW_ID, PA_MD5PW_IDLEN) == 0) {
1.19 paf 153: const size_t sample_size=120;
154: char *sample_buf=(char *)pool.malloc(sample_size);
155: pa_MD5Encode((const unsigned char *)password,
1.20 paf 156: (const unsigned char *)normal_salt, sample_buf, sample_size);
157: r.write_pass_lang(*new(pool) String(pool, sample_buf));
158: } else {
159: #ifdef HAVE_CRYPT
160: const char *sample_buf=crypt(password, normal_salt);
161: if(!sample_buf // nothing generated
162: || !sample_buf[0] // generated nothing
163: || strncmp(sample_buf, normal_salt, prefix_size)!=0) // salt prefix not preserved
164: throw Exception("parser.runtime",
165: &method_name,
1.21 paf 166: "on this platform does not support '%.*s' salt prefix", prefix_size, normal_salt);
1.20 paf 167:
1.19 paf 168: r.write_pass_lang(*new(pool) String(pool, sample_buf));
1.20 paf 169: #else
1.19 paf 170: throw Exception("parser.runtime",
171: &method_name,
172: "salt must start with '" PA_MD5PW_ID "'");
1.20 paf 173: #endif
174: }
1.19 paf 175: }
176:
1.1 parser 177: // constructor
178:
1.18 paf 179: MMath::MMath(Pool& apool) : Methoded(apool, "math") {
1.1 parser 180: // ^FUNC(expr)
181: #define ADD1(name) \
182: add_native_method(#name, Method::CT_STATIC, _##name, 1, 1)
183:
184: ADD1(round); ADD1(floor); ADD1(ceiling);
1.3 parser 185: ADD1(trunc); ADD1(frac);
1.1 parser 186: ADD1(abs); ADD1(sign);
187: ADD1(exp); ADD1(log);
188: ADD1(sin); ADD1(asin);
189: ADD1(cos); ADD1(acos);
190: ADD1(tan); ADD1(atan);
1.3 parser 191: ADD1(degrees); ADD1(radians);
1.1 parser 192: ADD1(sqrt);
1.3 parser 193: ADD1(random);
1.1 parser 194:
195: #define ADD2(name) \
196: add_native_method(#name, Method::CT_STATIC, _##name, 2, 2)
197:
198: // ^pow(x;y)
199: ADD2(pow);
200:
1.19 paf 201: // ^crypt[password;salt]
202: ADD2(crypt);
1.5 parser 203: }
204:
205: // in MSVC each thread has it's own pseudo-random sequence
206: // in win32 apache each thread can handle multiple requests
207: // so to get proper randoms we remember random generated in one thread
208: void MMath::configure_admin(Request&) {
209: // setting seed
210: srand(
1.14 paf 211: randomizer
1.5 parser 212: #ifdef WIN32
1.14 paf 213: ^ GetCurrentThreadId()
1.5 parser 214: #else
1.14 paf 215: ^ getpid()
1.5 parser 216: #endif
1.20 paf 217: ^(unsigned int)time(NULL)
1.5 parser 218: );
219: if(!randomizer)
220: randomizer=rand();
1.1 parser 221: }
222:
1.2 parser 223: // global variables
224:
225: Methoded *math_base_class;
226: Hash *math_consts;
227:
1.1 parser 228: // creator
229:
230: Methoded *MMath_create(Pool& pool) {
1.2 parser 231: math_consts=new(pool) Hash(pool);
232: math_consts->put(
233: *new(pool) String(pool, "PI"),
1.3 parser 234: new(pool) VDouble(pool, PI));
1.2 parser 235:
236: return math_base_class=new(pool) MMath(pool);
1.1 parser 237: }
E-mail:
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to math.C CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [parser3project] / parser3 / src / classes