Annotation of parser3/src/include/pa_string.h, revision 1.42
1.41 paf 1: /** @file
1.29 paf 2: Parser
3: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.30 paf 4: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.29 paf 5:
1.42 ! paf 6: $Id: pa_string.h,v 1.41 2001/03/19 15:29:38 paf Exp $
1.1 paf 7: */
8:
9: #ifndef PA_STRING_H
10: #define PA_STRING_H
11:
1.9 paf 12: #ifdef HAVE_CONFIG_H
1.35 paf 13: # include "pa_config.h"
1.9 paf 14: #endif
15:
1.1 paf 16: #include <stddef.h>
17:
1.15 paf 18: #include "pa_pool.h"
1.4 paf 19: #include "pa_types.h"
20:
1.31 paf 21: #define UNTAINT_TIMES_BIGGER 10
22:
1.9 paf 23: #ifndef NO_STRING_ORIGIN
1.33 paf 24: # define STRING_APPEND_PARAMS \
25: const char *src, size_t size, \
26: bool tainted, \
27: const char *file, uint line
1.41 paf 28: /// appends clean piece to String
1.27 paf 29: # define APPEND(src, size, file, line) real_append(src, size, false, file, line)
1.41 paf 30: /// appends tainted piece to String
1.27 paf 31: # define APPEND_TAINTED(src, size, file, line) real_append(src, size, true, file, line)
1.9 paf 32: #else
1.33 paf 33: # define STRING_APPEND_PARAMS \
34: const char *src, \
35: size_t size, \
36: bool tainted
1.41 paf 37: /// appends clean piece to String
1.27 paf 38: # define APPEND(src, size, file, line) real_append(src, size, false)
1.41 paf 39: /// appends tainted piece to String
1.27 paf 40: # define APPEND_TAINTED(src, size, file, line) real_append(src, size, true)
1.9 paf 41: #endif
1.41 paf 42: /// handy: appends const char* piece to String
1.23 paf 43: #define APPEND_CONST(src) APPEND(src, 0, 0, 0)
1.9 paf 44:
1.42 ! paf 45: /**
1.41 paf 46: Pooled string.
47:
48: Internal structure: @verbatim
49:
50: String Chunk0
51: ====== ========
52: head--------------->[ptr, size, ...]
53: append_here-------->[ptr, size, ...]
54: .
55: .
56: [ptr, size, ...]
57: link_row----------->[link to the next chunk]
58:
59: @endverbatim
60:
61: All pieces remember
62: - the file and its line they are from [can be turned off by NO_STRING_ORIGIN]
63: - whether they are tainted or not,
64: and the language which should be used to detaint them
65: */
1.15 paf 66: class String : public Pooled {
1.1 paf 67: public:
68: enum {
1.41 paf 69: CR_PREALLOCATED_COUNT=5, ///< default preallocated item count
70: CR_GROW_PERCENT=60 ///< each time the Array chunk_is_full() array expanded()
1.1 paf 71: };
72:
1.41 paf 73: /// piece is tainted or not. the language to use when detaint
1.27 paf 74: enum Untaint_lang {
1.41 paf 75: UNKNOWN=0, ///< when get by name fails
76: NO, ///< clean
77: YES, ///< tainted, untaint language as assigned later
1.27 paf 78: // untaint languages. assigned by ^untaint[lang]{...}
1.40 paf 79: PASS_APPENDED,
1.41 paf 80: /**<
81: leave language built into string being appended.
82: just a flag, that value not stored
83: */
84: AS_IS, ///< leave all characters intact
85: HEADER, ///< text in response header
86: URI, ///< text in uri
87: TABLE, ///< ^table:set body
88: SQL, ///< ^table:sql body
89: JS, ///< JavaScript code
90: HTML, ///< HTML code (for editing)
91: HTML_TYPO ///< HTML code with TYPOgraphic replacements (for showing)
1.27 paf 92: };
93:
1.8 paf 94: public:
95:
1.37 paf 96: String(Pool& apool, const char *src=0, bool tainted=false);
1.14 paf 97: String(const String& src);
98: size_t size() const { return fsize; }
1.41 paf 99: /// convert to C string
1.14 paf 100: char *cstr() const;
1.9 paf 101: String& real_append(STRING_APPEND_PARAMS);
1.41 paf 102: /// \return <0 ==0 or >0 depending on comparison result
1.26 paf 103: int cmp (const String& src) const;
104: bool operator < (const String& src) const { return cmp(src)<0; }
105: bool operator > (const String& src) const { return cmp(src)>0; }
106: bool operator <= (const String& src) const { return cmp(src)<=0; }
107: bool operator >= (const String& src) const { return cmp(src)>=0; }
108: bool operator == (const String& src) const {
109: if(size()!=src.size()) // can speed up in trivial case
110: return false;
111: return cmp(src)==0;
112: }
113: bool operator != (const String& src) const { return cmp(src)!=0; }
114:
1.34 paf 115: bool operator == (const char* b_ptr) const;
1.42 ! paf 116: /**
! 117: appends other String.
1.41 paf 118:
119: marking all tainted pieces of it with \a lang.
120: or marking ALL pieces of it with a \a lang when \a forced to.
121: */
1.39 paf 122: String& append(const String& src, Untaint_lang lang, bool forced=false);
1.8 paf 123:
1.41 paf 124: /// simple hash code of string. used by Hash
1.14 paf 125: uint hash_code() const;
1.13 paf 126:
1.41 paf 127: #ifndef NO_STRING_ORIGIN
128: /// origin of string. calculated by first row
129: const Origin& origin() const {
130: if(!fused_rows)
131: THROW(0, 0,
132: 0,
133: "String::origin() of empty string called");
1.36 paf 134:
1.41 paf 135: return head.rows[0].item.origin;
136: }
137: #endif
1.8 paf 138:
1.10 paf 139: private:
140:
1.1 paf 141: struct Chunk {
1.6 paf 142: // the number of rows in chunk
1.1 paf 143: int count;
144: union Row {
1.27 paf 145: // fragment
146: struct {
147: const char *ptr; // pointer to the start
148: size_t size; // length
149: Untaint_lang lang; // untaint flag, later untaint language
150: #ifndef NO_STRING_ORIGIN
151: Origin origin; // origin
152: #endif
1.1 paf 153: } item;
154: Chunk *link; // link to the next chunk in chain
1.2 paf 155: } rows[CR_PREALLOCATED_COUNT];
1.1 paf 156: // next rows are here
157: Chunk *preallocated_link;
158: }
159: head; // the head chunk of the chunk chain
160:
161: // next append would write to this record
162: Chunk::Row *append_here;
163:
164: // the address of place where lies address
165: // of the link to the next chunk to allocate
166: Chunk::Row *link_row;
167:
1.5 paf 168: private:
1.25 paf 169: // last chunk
170: Chunk *last_chunk;
1.5 paf 171:
172: // string size
173: size_t fsize;
174:
175: // used rows in all chunks
176: int fused_rows;
177:
178: private:
1.1 paf 179:
180: bool chunk_is_full() {
181: return append_here == link_row;
182: }
183: void expand();
1.39 paf 184: void set_lang(Chunk::Row *row, Untaint_lang lang, bool forced, size_t size);
1.7 paf 185:
186: private: //disabled
187:
1.12 paf 188: String& operator = (const String&) { return *this; }
1.7 paf 189:
1.1 paf 190: };
191:
192: #endif
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