Annotation of parser3/src/classes/math.C, revision 1.24.2.5
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:
1.24.2.5! paf 8: static const char* IDENT_MATH_C="$Date: 2003/02/04 14:12:42 $";
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:
33: class MMath : public Methoded {
34: public:
35: MMath(Pool& pool);
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:
42: // methods
1.5 parser 43: static unsigned int randomizer=0;
1.20 paf 44: static inline int _random(uint top) {
45: return (int)(((double)((randomizer=rand())% RAND_MAX)) / RAND_MAX * top );
46: }
1.24.2.3 paf 47: static void _random(Request& r, StringPtr method_name, MethodParams& params) {
1.1 parser 48: Pool& pool=r.pool();
49:
1.24.2.3 paf 50: Value& range=params.as_junction(0, "range must be expression");
1.17 paf 51: double top=r.process_to_value(range).as_double();
1.14 paf 52: if(top<=1)
1.16 paf 53: throw Exception("parser.runtime",
1.24.2.5! paf 54: method_name,
1.20 paf 55: "top must be above 1(%g)", top);
1.1 parser 56:
1.20 paf 57: r.write_no_lang(*new(pool) VInt(pool, _random(uint(top))));
1.1 parser 58: }
59:
60:
1.20 paf 61: typedef double(*math1_func_ptr)(double);
1.3 parser 62: static double frac(double param) { return param-trunc(param); }
63: static double degrees(double param) { return param /PI *180; }
64: static double radians(double param) { return param /180 *PI; }
1.1 parser 65:
66: static void math1(Request& r,
1.24.2.3 paf 67: StringPtr method_name, MethodParams& params,
1.1 parser 68: math1_func_ptr func) {
69: Pool& pool=r.pool();
1.24.2.3 paf 70: Value& param=params.as_junction(0, "parameter must be expression");
1.1 parser 71:
1.18 paf 72: double result=(*func)(r.process_to_value(param).as_double());
73: r.write_no_lang(*new(pool) VDouble(pool, result));
1.1 parser 74: }
75:
76: #define MATH1(name) \
1.24.2.3 paf 77: static void _##name(Request& r, StringPtr method_name, MethodParams& params) {\
1.1 parser 78: math1(r, method_name, params, &name);\
79: }
80: #define MATH1P(name_parser, name_c) \
1.24.2.3 paf 81: static void _##name_parser(Request& r, StringPtr method_name, MethodParams& params) {\
1.1 parser 82: math1(r, method_name, params, &name_c);\
83: }
84: MATH1(round); MATH1(floor); MATH1P(ceiling, ceil);
1.3 parser 85: MATH1(trunc); MATH1(frac);
1.1 parser 86: MATH1P(abs, fabs); MATH1(sign);
87: MATH1(exp); MATH1(log);
88: MATH1(sin); MATH1(asin);
89: MATH1(cos); MATH1(acos);
90: MATH1(tan); MATH1(atan);
1.3 parser 91: MATH1(degrees); MATH1(radians);
1.1 parser 92: MATH1(sqrt);
93:
94:
95: typedef double (*math2_func_ptr)(double, double);
96: static void math2(Request& r,
1.24.2.3 paf 97: StringPtr method_name, MethodParams& params,
1.1 parser 98: math2_func_ptr func) {
99: Pool& pool=r.pool();
1.24.2.3 paf 100: Value& a=params.as_junction(0, "parameter must be expression");
101: Value& b=params.as_junction(1, "parameter must be expression");
1.1 parser 102:
1.18 paf 103: double result=(*func)(
1.17 paf 104: r.process_to_value(a).as_double(),
1.18 paf 105: r.process_to_value(b).as_double());
106: r.write_no_lang(*new(pool) VDouble(pool, result));
1.1 parser 107: }
108:
109: #define MATH2(name) \
1.24.2.3 paf 110: static void _##name(Request& r, StringPtr method_name, MethodParams& params) {\
1.1 parser 111: math2(r, method_name, params, &name);\
112: }
113: MATH2(pow);
114:
1.20 paf 115: inline bool is_salt_body_char(int c) {
116: return isalnum(c) || c == '.' || c=='/';
117: }
1.24.2.2 paf 118: static size_t calc_prefix_size(const char* salt) {
1.20 paf 119: if(size_t salt_size=strlen(salt)) {
120: if(!is_salt_body_char(salt[0])) { // $... {...
1.24.2.2 paf 121: const char* cur=salt+1; // skip
1.20 paf 122: while(is_salt_body_char(*cur++)) // ...$ ...}
123: ;
124: return cur-salt;
125: } else
126: return 0;
127: } else
128: return 0;
129: }
1.24.2.3 paf 130: static void _crypt(Request& r, StringPtr method_name, MethodParams& params) {
1.19 paf 131: Pool& pool=r.pool();
1.24.2.3 paf 132: const char* password=params.as_string(0, "password must be string").cstr();
133: const char* maybe_bodyless_salt=params.as_string(1, "salt must be string").cstr();
1.20 paf 134:
135: size_t prefix_size=calc_prefix_size(maybe_bodyless_salt);
1.24.2.2 paf 136: const char* normal_salt;
1.20 paf 137: char normalize_buf[MAX_STRING];
138: if(prefix_size==strlen(maybe_bodyless_salt)) { // bodyless?
139: strncpy(normalize_buf, maybe_bodyless_salt, MAX_STRING-MAX_SALT-1);
140: char *cur=normalize_buf+strlen(normalize_buf);
141: // sould add up MAX_SALT random chars
142: static unsigned char itoa64[] = /* 0 ... 63 => ASCII - 64 */
143: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
144: for(int i=0; i<MAX_SALT; i++)
145: *cur++=itoa64[_random(64)];
146: *cur=0;
147: normal_salt=normalize_buf;
148: } else
149: normal_salt=maybe_bodyless_salt;
1.19 paf 150:
151: /* FreeBSD style MD5 string
152: */
1.20 paf 153: if(strncmp(normal_salt, PA_MD5PW_ID, PA_MD5PW_IDLEN) == 0) {
1.19 paf 154: const size_t sample_size=120;
155: char *sample_buf=(char *)pool.malloc(sample_size);
156: pa_MD5Encode((const unsigned char *)password,
1.20 paf 157: (const unsigned char *)normal_salt, sample_buf, sample_size);
158: r.write_pass_lang(*new(pool) String(pool, sample_buf));
159: } else {
160: #ifdef HAVE_CRYPT
1.24.2.2 paf 161: const char* sample_buf=crypt(password, normal_salt);
1.20 paf 162: if(!sample_buf // nothing generated
163: || !sample_buf[0] // generated nothing
164: || strncmp(sample_buf, normal_salt, prefix_size)!=0) // salt prefix not preserved
165: throw Exception("parser.runtime",
1.24.2.5! paf 166: method_name,
1.21 paf 167: "on this platform does not support '%.*s' salt prefix", prefix_size, normal_salt);
1.20 paf 168:
1.19 paf 169: r.write_pass_lang(*new(pool) String(pool, sample_buf));
1.20 paf 170: #else
1.19 paf 171: throw Exception("parser.runtime",
1.24.2.5! paf 172: method_name,
1.19 paf 173: "salt must start with '" PA_MD5PW_ID "'");
1.20 paf 174: #endif
175: }
1.19 paf 176: }
177:
1.1 parser 178: // constructor
179:
1.18 paf 180: MMath::MMath(Pool& apool) : Methoded(apool, "math") {
1.1 parser 181: // ^FUNC(expr)
182: #define ADD1(name) \
183: add_native_method(#name, Method::CT_STATIC, _##name, 1, 1)
184:
185: ADD1(round); ADD1(floor); ADD1(ceiling);
1.3 parser 186: ADD1(trunc); ADD1(frac);
1.1 parser 187: ADD1(abs); ADD1(sign);
188: ADD1(exp); ADD1(log);
189: ADD1(sin); ADD1(asin);
190: ADD1(cos); ADD1(acos);
191: ADD1(tan); ADD1(atan);
1.3 parser 192: ADD1(degrees); ADD1(radians);
1.1 parser 193: ADD1(sqrt);
1.3 parser 194: ADD1(random);
1.1 parser 195:
196: #define ADD2(name) \
197: add_native_method(#name, Method::CT_STATIC, _##name, 2, 2)
198:
199: // ^pow(x;y)
200: ADD2(pow);
201:
1.19 paf 202: // ^crypt[password;salt]
203: ADD2(crypt);
1.5 parser 204: }
205:
206: // in MSVC each thread has it's own pseudo-random sequence
207: // in win32 apache each thread can handle multiple requests
208: // so to get proper randoms we remember random generated in one thread
209: void MMath::configure_admin(Request&) {
210: // setting seed
211: srand(
1.14 paf 212: randomizer
1.5 parser 213: #ifdef WIN32
1.14 paf 214: ^ GetCurrentThreadId()
1.5 parser 215: #else
1.14 paf 216: ^ getpid()
1.5 parser 217: #endif
1.20 paf 218: ^(unsigned int)time(NULL)
1.5 parser 219: );
220: if(!randomizer)
221: randomizer=rand();
1.1 parser 222: }
223:
1.2 parser 224: // global variables
225:
1.24.2.1 paf 226: VStateless_classPtr math_base_class(???);
1.2 parser 227:
1.1 parser 228: // creator
229:
230: Methoded *MMath_create(Pool& pool) {
1.2 parser 231: return math_base_class=new(pool) MMath(pool);
1.1 parser 232: }
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