Annotation of libwww/Library/src/HTAtom.html, revision 2.13
2.7 frystyk 1: <HTML>
2: <HEAD>
3: <TITLE>Atoms - an easy way of organizing strings</TITLE>
4: </HEAD>
5: <BODY>
6:
7: <H1>Atoms</H1>
2.9 frystyk 8:
9: <PRE>
10: /*
11: ** (c) COPYRIGHT CERN 1994.
12: ** Please first read the full copyright statement in the file COPYRIGH.
13: */
14: </PRE>
2.7 frystyk 15:
16: <CODE>Atoms</CODE> are strings which are given representative pointer
17: values so that they can be stored more efficiently, and compaisons for
18: equality done more efficiently. The list of <CODE>atoms</CODE> are
19: stored in a has table, so when asking for a new atom you might infact
20: get back an existing one.<P>
21:
22: There are a whole bunch of <A
23: HREF="HTFormat.html#FormatTypes">MIME-types</A> defined as
24: <CODE>atoms</CODE>, so please use them! <P>
25:
26: This module is implemented by <A HREF="HTAtom.c">HTAtom.c</A>, and it
27: is a part of the <A NAME="z10"
2.13 ! frystyk 28: HREF="http://www.w3.org/hypertext/WWW/Library/User/Guide/Guide.html">Library
2.7 frystyk 29: of Common Code</A>. <P>
30:
1.1 timbl 31: <PRE>
32: #ifndef HTATOM_H
33: #define HTATOM_H
34:
2.6 luotonen 35: #include "HTList.h"
36:
1.1 timbl 37: typedef struct _HTAtom HTAtom;
38: struct _HTAtom {
39: HTAtom * next;
40: char * name;
41: }; /* struct _HTAtom */
2.7 frystyk 42: </PRE>
43:
44: <H2>Public Functions</H2>
45:
46: The following methods are available for this class:
47:
48: <H3>Get an Atom</H3>
1.1 timbl 49:
2.7 frystyk 50: This function returns a representative value (an <CODE>atom</CODE>)
51: such that it will always (within one run of the program) return the
52: same value for the same given string.
1.1 timbl 53:
2.7 frystyk 54: <PRE>
2.8 frystyk 55: extern HTAtom * HTAtom_for PARAMS((CONST char * string));
2.7 frystyk 56: </PRE>
57:
58: <H3>Get Content of an Atom</H3>
1.1 timbl 59:
2.7 frystyk 60: <PRE>
1.2 timbl 61: #define HTAtom_name(a) ((a)->name)
2.7 frystyk 62: </PRE>
63:
64: This macro returns the string pointed to by the <CODE>atom</CODE>.
65:
66: <H3>Search For Atoms</H3>
67:
68: Returns a list of <CODE>atoms</CODE> which matches the template
69: given. It is especially made for MIME-types so that for example a
70: template like <CODE>text<slash><star></CODE> returns a
71: list of all MIME-types of type <CODE>text</CODE>.
72:
73: <PRE>
2.8 frystyk 74: extern HTList * HTAtom_templateMatches PARAMS((CONST char * templ));
2.10 frystyk 75: </PRE>
76:
77: <H3>Cleanup Memory</H3>
78:
79: In order to cleanup memory, call this function. This is done
80: automaticly from the <A
81: HREF="HTAccess.html#Library">HTLibTerminate</A> function.
82:
83: <PRE>
84: extern void HTAtom_deleteAll NOPARAMS;
1.1 timbl 85:
2.7 frystyk 86: #endif
1.1 timbl 87: </PRE>
2.7 frystyk 88:
89: End of HTAtom definition.
90:
91: </BODY>
92: </HTML>
93:
Webmaster