Annotation of parser3/src/classes/math.C, revision 1.24.2.2
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:
1.24.2.2! paf 8: static const char* IDENT_MATH_C="$Date: 2003/01/29 09:16:14 $";
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:
1.20 paf 27: #define MAX_SALT 8
1.1 parser 28:
29: // class
30:
31: class MMath : public Methoded {
32: public:
33: MMath(Pool& pool);
1.5 parser 34: void configure_admin(Request& r);
35:
1.1 parser 36: public: // Methoded
1.15 paf 37: bool used_directly() { return false; }
1.1 parser 38: };
39:
40: // methods
1.5 parser 41: static unsigned int randomizer=0;
1.20 paf 42: static inline int _random(uint top) {
43: return (int)(((double)((randomizer=rand())% RAND_MAX)) / RAND_MAX * top );
44: }
1.1 parser 45: static void _random(Request& r, const String& method_name, MethodParams *params) {
46: Pool& pool=r.pool();
47:
1.3 parser 48: Value& range=params->as_junction(0, "range must be expression");
1.17 paf 49: double top=r.process_to_value(range).as_double();
1.14 paf 50: if(top<=1)
1.16 paf 51: throw Exception("parser.runtime",
1.1 parser 52: &method_name,
1.20 paf 53: "top must be above 1(%g)", top);
1.1 parser 54:
1.20 paf 55: r.write_no_lang(*new(pool) VInt(pool, _random(uint(top))));
1.1 parser 56: }
57:
58:
1.20 paf 59: typedef double(*math1_func_ptr)(double);
1.3 parser 60: static double frac(double param) { return param-trunc(param); }
61: static double degrees(double param) { return param /PI *180; }
62: static double radians(double param) { return param /180 *PI; }
1.1 parser 63:
64: static void math1(Request& r,
65: const String& method_name, MethodParams *params,
66: math1_func_ptr func) {
67: Pool& pool=r.pool();
1.3 parser 68: Value& param=params->as_junction(0, "parameter must be expression");
1.1 parser 69:
1.18 paf 70: double result=(*func)(r.process_to_value(param).as_double());
71: r.write_no_lang(*new(pool) VDouble(pool, result));
1.1 parser 72: }
73:
74: #define MATH1(name) \
75: static void _##name(Request& r, const String& method_name, MethodParams *params) {\
76: math1(r, method_name, params, &name);\
77: }
78: #define MATH1P(name_parser, name_c) \
79: static void _##name_parser(Request& r, const String& method_name, MethodParams *params) {\
80: math1(r, method_name, params, &name_c);\
81: }
82: MATH1(round); MATH1(floor); MATH1P(ceiling, ceil);
1.3 parser 83: MATH1(trunc); MATH1(frac);
1.1 parser 84: MATH1P(abs, fabs); MATH1(sign);
85: MATH1(exp); MATH1(log);
86: MATH1(sin); MATH1(asin);
87: MATH1(cos); MATH1(acos);
88: MATH1(tan); MATH1(atan);
1.3 parser 89: MATH1(degrees); MATH1(radians);
1.1 parser 90: MATH1(sqrt);
91:
92:
93: typedef double (*math2_func_ptr)(double, double);
94: static void math2(Request& r,
95: const String& method_name, MethodParams *params,
96: math2_func_ptr func) {
97: Pool& pool=r.pool();
1.3 parser 98: Value& a=params->as_junction(0, "parameter must be expression");
99: Value& b=params->as_junction(1, "parameter must be expression");
1.1 parser 100:
1.18 paf 101: double result=(*func)(
1.17 paf 102: r.process_to_value(a).as_double(),
1.18 paf 103: r.process_to_value(b).as_double());
104: r.write_no_lang(*new(pool) VDouble(pool, result));
1.1 parser 105: }
106:
107: #define MATH2(name) \
108: static void _##name(Request& r, const String& method_name, MethodParams *params) {\
109: math2(r, method_name, params, &name);\
110: }
111: MATH2(pow);
112:
1.20 paf 113: inline bool is_salt_body_char(int c) {
114: return isalnum(c) || c == '.' || c=='/';
115: }
1.24.2.2! paf 116: static size_t calc_prefix_size(const char* salt) {
1.20 paf 117: if(size_t salt_size=strlen(salt)) {
118: if(!is_salt_body_char(salt[0])) { // $... {...
1.24.2.2! paf 119: const char* cur=salt+1; // skip
1.20 paf 120: while(is_salt_body_char(*cur++)) // ...$ ...}
121: ;
122: return cur-salt;
123: } else
124: return 0;
125: } else
126: return 0;
127: }
1.19 paf 128: static void _crypt(Request& r, const String& method_name, MethodParams *params) {
129: Pool& pool=r.pool();
1.24.2.2! paf 130: const char* password=params->as_string(0, "password must be string").cstr();
! 131: const char* maybe_bodyless_salt=params->as_string(1, "salt must be string").cstr();
1.20 paf 132:
133: size_t prefix_size=calc_prefix_size(maybe_bodyless_salt);
1.24.2.2! paf 134: const char* normal_salt;
1.20 paf 135: char normalize_buf[MAX_STRING];
136: if(prefix_size==strlen(maybe_bodyless_salt)) { // bodyless?
137: strncpy(normalize_buf, maybe_bodyless_salt, MAX_STRING-MAX_SALT-1);
138: char *cur=normalize_buf+strlen(normalize_buf);
139: // sould add up MAX_SALT random chars
140: static unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
141: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
142: for(int i=0; i<MAX_SALT; i++)
143: *cur++=itoa64[_random(64)];
144: *cur=0;
145: normal_salt=normalize_buf;
146: } else
147: normal_salt=maybe_bodyless_salt;
1.19 paf 148:
149: /* FreeBSD style MD5 string
150: */
1.20 paf 151: if(strncmp(normal_salt, PA_MD5PW_ID, PA_MD5PW_IDLEN) == 0) {
1.19 paf 152: const size_t sample_size=120;
153: char *sample_buf=(char *)pool.malloc(sample_size);
154: pa_MD5Encode((const unsigned char *)password,
1.20 paf 155: (const unsigned char *)normal_salt, sample_buf, sample_size);
156: r.write_pass_lang(*new(pool) String(pool, sample_buf));
157: } else {
158: #ifdef HAVE_CRYPT
1.24.2.2! paf 159: const char* sample_buf=crypt(password, normal_salt);
1.20 paf 160: if(!sample_buf // nothing generated
161: || !sample_buf[0] // generated nothing
162: || strncmp(sample_buf, normal_salt, prefix_size)!=0) // salt prefix not preserved
163: throw Exception("parser.runtime",
164: &method_name,
1.21 paf 165: "on this platform does not support '%.*s' salt prefix", prefix_size, normal_salt);
1.20 paf 166:
1.19 paf 167: r.write_pass_lang(*new(pool) String(pool, sample_buf));
1.20 paf 168: #else
1.19 paf 169: throw Exception("parser.runtime",
170: &method_name,
171: "salt must start with '" PA_MD5PW_ID "'");
1.20 paf 172: #endif
173: }
1.19 paf 174: }
175:
1.1 parser 176: // constructor
177:
1.18 paf 178: MMath::MMath(Pool& apool) : Methoded(apool, "math") {
1.1 parser 179: // ^FUNC(expr)
180: #define ADD1(name) \
181: add_native_method(#name, Method::CT_STATIC, _##name, 1, 1)
182:
183: ADD1(round); ADD1(floor); ADD1(ceiling);
1.3 parser 184: ADD1(trunc); ADD1(frac);
1.1 parser 185: ADD1(abs); ADD1(sign);
186: ADD1(exp); ADD1(log);
187: ADD1(sin); ADD1(asin);
188: ADD1(cos); ADD1(acos);
189: ADD1(tan); ADD1(atan);
1.3 parser 190: ADD1(degrees); ADD1(radians);
1.1 parser 191: ADD1(sqrt);
1.3 parser 192: ADD1(random);
1.1 parser 193:
194: #define ADD2(name) \
195: add_native_method(#name, Method::CT_STATIC, _##name, 2, 2)
196:
197: // ^pow(x;y)
198: ADD2(pow);
199:
1.19 paf 200: // ^crypt[password;salt]
201: ADD2(crypt);
1.5 parser 202: }
203:
204: // in MSVC each thread has it's own pseudo-random sequence
205: // in win32 apache each thread can handle multiple requests
206: // so to get proper randoms we remember random generated in one thread
207: void MMath::configure_admin(Request&) {
208: // setting seed
209: srand(
1.14 paf 210: randomizer
1.5 parser 211: #ifdef WIN32
1.14 paf 212: ^ GetCurrentThreadId()
1.5 parser 213: #else
1.14 paf 214: ^ getpid()
1.5 parser 215: #endif
1.20 paf 216: ^(unsigned int)time(NULL)
1.5 parser 217: );
218: if(!randomizer)
219: randomizer=rand();
1.1 parser 220: }
221:
1.2 parser 222: // global variables
223:
1.24.2.1 paf 224: VStateless_classPtr math_base_class(???);
1.2 parser 225:
1.1 parser 226: // creator
227:
228: Methoded *MMath_create(Pool& pool) {
1.2 parser 229: return math_base_class=new(pool) MMath(pool);
1.1 parser 230: }
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