Annotation of parser3/src/include/pa_string.h, revision 1.45
1.41 paf 1: /** @file
1.43 paf 2: Parser: string class decl.
3:
1.29 paf 4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.43 paf 5:
1.30 paf 6: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.29 paf 7:
1.45 ! paf 8: $Id: pa_string.h,v 1.44 2001/03/19 20:07:37 paf Exp $
1.1 paf 9: */
10:
11: #ifndef PA_STRING_H
12: #define PA_STRING_H
13:
1.9 paf 14: #ifdef HAVE_CONFIG_H
1.35 paf 15: # include "pa_config.h"
1.9 paf 16: #endif
17:
1.1 paf 18: #include <stddef.h>
19:
1.15 paf 20: #include "pa_pool.h"
1.4 paf 21: #include "pa_types.h"
22:
1.31 paf 23: #define UNTAINT_TIMES_BIGGER 10
24:
1.9 paf 25: #ifndef NO_STRING_ORIGIN
1.33 paf 26: # define STRING_APPEND_PARAMS \
27: const char *src, size_t size, \
28: bool tainted, \
29: const char *file, uint line
1.41 paf 30: /// appends clean piece to String
1.27 paf 31: # define APPEND(src, size, file, line) real_append(src, size, false, file, line)
1.41 paf 32: /// appends tainted piece to String
1.27 paf 33: # define APPEND_TAINTED(src, size, file, line) real_append(src, size, true, file, line)
1.9 paf 34: #else
1.33 paf 35: # define STRING_APPEND_PARAMS \
36: const char *src, \
37: size_t size, \
38: bool tainted
1.41 paf 39: /// appends clean piece to String
1.27 paf 40: # define APPEND(src, size, file, line) real_append(src, size, false)
1.41 paf 41: /// appends tainted piece to String
1.27 paf 42: # define APPEND_TAINTED(src, size, file, line) real_append(src, size, true)
1.9 paf 43: #endif
1.41 paf 44: /// handy: appends const char* piece to String
1.23 paf 45: #define APPEND_CONST(src) APPEND(src, 0, 0, 0)
1.9 paf 46:
1.42 paf 47: /**
1.41 paf 48: Pooled string.
49:
50: Internal structure: @verbatim
51:
52: String Chunk0
53: ====== ========
54: head--------------->[ptr, size, ...]
55: append_here-------->[ptr, size, ...]
56: .
57: .
58: [ptr, size, ...]
59: link_row----------->[link to the next chunk]
60:
61: @endverbatim
62:
63: All pieces remember
64: - the file and its line they are from [can be turned off by NO_STRING_ORIGIN]
65: - whether they are tainted or not,
66: and the language which should be used to detaint them
67: */
1.15 paf 68: class String : public Pooled {
1.1 paf 69: public:
70: enum {
1.41 paf 71: CR_PREALLOCATED_COUNT=5, ///< default preallocated item count
72: CR_GROW_PERCENT=60 ///< each time the Array chunk_is_full() array expanded()
1.1 paf 73: };
74:
1.41 paf 75: /// piece is tainted or not. the language to use when detaint
1.27 paf 76: enum Untaint_lang {
1.41 paf 77: UNKNOWN=0, ///< when get by name fails
78: NO, ///< clean
79: YES, ///< tainted, untaint language as assigned later
1.27 paf 80: // untaint languages. assigned by ^untaint[lang]{...}
1.40 paf 81: PASS_APPENDED,
1.41 paf 82: /**<
83: leave language built into string being appended.
84: just a flag, that value not stored
85: */
86: AS_IS, ///< leave all characters intact
1.45 ! paf 87: FILE, ///< filename
1.41 paf 88: HEADER, ///< text in response header
89: URI, ///< text in uri
90: TABLE, ///< ^table:set body
91: SQL, ///< ^table:sql body
92: JS, ///< JavaScript code
93: HTML, ///< HTML code (for editing)
94: HTML_TYPO ///< HTML code with TYPOgraphic replacements (for showing)
1.27 paf 95: };
96:
1.8 paf 97: public:
98:
1.37 paf 99: String(Pool& apool, const char *src=0, bool tainted=false);
1.14 paf 100: String(const String& src);
101: size_t size() const { return fsize; }
1.41 paf 102: /// convert to C string
1.14 paf 103: char *cstr() const;
1.9 paf 104: String& real_append(STRING_APPEND_PARAMS);
1.44 paf 105: /// @return <0 ==0 or >0 depending on comparison result
1.26 paf 106: int cmp (const String& src) const;
107: bool operator < (const String& src) const { return cmp(src)<0; }
108: bool operator > (const String& src) const { return cmp(src)>0; }
109: bool operator <= (const String& src) const { return cmp(src)<=0; }
110: bool operator >= (const String& src) const { return cmp(src)>=0; }
111: bool operator == (const String& src) const {
112: if(size()!=src.size()) // can speed up in trivial case
113: return false;
114: return cmp(src)==0;
115: }
116: bool operator != (const String& src) const { return cmp(src)!=0; }
117:
1.34 paf 118: bool operator == (const char* b_ptr) const;
1.42 paf 119: /**
120: appends other String.
1.41 paf 121:
122: marking all tainted pieces of it with \a lang.
123: or marking ALL pieces of it with a \a lang when \a forced to.
124: */
1.39 paf 125: String& append(const String& src, Untaint_lang lang, bool forced=false);
1.8 paf 126:
1.41 paf 127: /// simple hash code of string. used by Hash
1.14 paf 128: uint hash_code() const;
1.13 paf 129:
1.41 paf 130: #ifndef NO_STRING_ORIGIN
131: /// origin of string. calculated by first row
1.43 paf 132: const Origin& origin() const;
1.41 paf 133: #endif
1.8 paf 134:
1.10 paf 135: private:
136:
1.1 paf 137: struct Chunk {
1.6 paf 138: // the number of rows in chunk
1.1 paf 139: int count;
140: union Row {
1.27 paf 141: // fragment
142: struct {
143: const char *ptr; // pointer to the start
144: size_t size; // length
145: Untaint_lang lang; // untaint flag, later untaint language
146: #ifndef NO_STRING_ORIGIN
147: Origin origin; // origin
148: #endif
1.1 paf 149: } item;
150: Chunk *link; // link to the next chunk in chain
1.2 paf 151: } rows[CR_PREALLOCATED_COUNT];
1.1 paf 152: // next rows are here
153: Chunk *preallocated_link;
154: }
155: head; // the head chunk of the chunk chain
156:
157: // next append would write to this record
158: Chunk::Row *append_here;
159:
160: // the address of place where lies address
161: // of the link to the next chunk to allocate
162: Chunk::Row *link_row;
163:
1.5 paf 164: private:
1.25 paf 165: // last chunk
166: Chunk *last_chunk;
1.5 paf 167:
168: // string size
169: size_t fsize;
170:
171: // used rows in all chunks
172: int fused_rows;
173:
174: private:
1.1 paf 175:
176: bool chunk_is_full() {
177: return append_here == link_row;
178: }
179: void expand();
1.39 paf 180: void set_lang(Chunk::Row *row, Untaint_lang lang, bool forced, size_t size);
1.7 paf 181:
182: private: //disabled
183:
1.12 paf 184: String& operator = (const String&) { return *this; }
1.7 paf 185:
1.1 paf 186: };
187:
188: #endif
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