Annotation of parser3/src/classes/math.C, revision 1.27
1.1 parser 1: /** @file
2: Parser: @b math parser class.
3:
1.24 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:
1.27 ! paf 8: static const char* IDENT_MATH_C="$Date: 2003/04/14 14:59:29 $";
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");
1.25 paf 50: double top=r.process_to_value(range).as_double();
51: if(top<=0)
1.16 paf 52: throw Exception("parser.runtime",
1.1 parser 53: &method_name,
1.25 paf 54: "top must be above 0(%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);
1.27 ! paf 155: PA_MD5Encode((const unsigned char *)password,
1.26 paf 156: (const unsigned char *)normal_salt, 1/*TRUE: mix in magic string*/,
1.27 ! paf 157: sample_buf, sample_size);
1.20 paf 158: r.write_pass_lang(*new(pool) String(pool, sample_buf));
159: } else {
160: #ifdef HAVE_CRYPT
161: const char *sample_buf=crypt(password, normal_salt);
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",
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",
172: &method_name,
173: "salt must start with '" PA_MD5PW_ID "'");
1.20 paf 174: #endif
175: }
1.19 paf 176: }
177:
1.26 paf 178: static void _md5(Request& r, const String& method_name, MethodParams *params) {
179: Pool& pool=r.pool();
180: const char *string=params->as_string(0, "parameter must be string").cstr();
1.27 ! paf 181:
! 182:
! 183: PA_MD5_CTX context;
! 184: unsigned char digest[16];
! 185: PA_MD5Init(&context);
! 186: PA_MD5Update(&context, (const unsigned char*)string, strlen(string));
! 187: PA_MD5Final(digest, &context);
! 188:
! 189: char *digest_bytes_hex=(char *)pool.malloc(sizeof(digest)*2/*byte->hh*/+1/*for zero-teminator*/);
! 190: unsigned char *src=digest;
! 191: unsigned char *end=digest+sizeof(digest);
! 192: char *dest=digest_bytes_hex;
1.26 paf 193: while(src<end)
194: dest+=snprintf(dest, 3, "%02x", *src++);
195:
1.27 ! paf 196: r.write_pass_lang(*new(pool) String(pool, digest_bytes_hex));
1.26 paf 197: }
198:
1.1 parser 199: // constructor
200:
1.18 paf 201: MMath::MMath(Pool& apool) : Methoded(apool, "math") {
1.1 parser 202: // ^FUNC(expr)
203: #define ADD1(name) \
204: add_native_method(#name, Method::CT_STATIC, _##name, 1, 1)
205:
206: ADD1(round); ADD1(floor); ADD1(ceiling);
1.3 parser 207: ADD1(trunc); ADD1(frac);
1.1 parser 208: ADD1(abs); ADD1(sign);
209: ADD1(exp); ADD1(log);
210: ADD1(sin); ADD1(asin);
211: ADD1(cos); ADD1(acos);
212: ADD1(tan); ADD1(atan);
1.3 parser 213: ADD1(degrees); ADD1(radians);
1.1 parser 214: ADD1(sqrt);
1.3 parser 215: ADD1(random);
1.1 parser 216:
217: #define ADD2(name) \
218: add_native_method(#name, Method::CT_STATIC, _##name, 2, 2)
219:
220: // ^pow(x;y)
221: ADD2(pow);
222:
1.19 paf 223: // ^crypt[password;salt]
224: ADD2(crypt);
1.26 paf 225:
226: // ^md5[string]
227: ADD1(md5);
1.5 parser 228: }
229:
230: // in MSVC each thread has it's own pseudo-random sequence
231: // in win32 apache each thread can handle multiple requests
232: // so to get proper randoms we remember random generated in one thread
233: void MMath::configure_admin(Request&) {
234: // setting seed
235: srand(
1.14 paf 236: randomizer
1.5 parser 237: #ifdef WIN32
1.14 paf 238: ^ GetCurrentThreadId()
1.5 parser 239: #else
1.14 paf 240: ^ getpid()
1.5 parser 241: #endif
1.20 paf 242: ^(unsigned int)time(NULL)
1.5 parser 243: );
244: if(!randomizer)
245: randomizer=rand();
1.1 parser 246: }
247:
1.2 parser 248: // global variables
249:
250: Methoded *math_base_class;
251: Hash *math_consts;
252:
1.1 parser 253: // creator
254:
255: Methoded *MMath_create(Pool& pool) {
1.2 parser 256: math_consts=new(pool) Hash(pool);
257: math_consts->put(
258: *new(pool) String(pool, "PI"),
1.3 parser 259: new(pool) VDouble(pool, PI));
1.2 parser 260:
261: return math_base_class=new(pool) MMath(pool);
1.1 parser 262: }
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