Annotation of libwww/Library/src/HTAtom.html, revision 2.27
2.7 frystyk 1: <HTML>
2: <HEAD>
2.24 frystyk 3: <!-- Changed by: Henrik Frystyk Nielsen, 23-Mar-1996 -->
2.25 frystyk 4: <TITLE>W3C Sample Code Library libwww Atom Class</TITLE>
2.7 frystyk 5: </HEAD>
6: <BODY>
2.24 frystyk 7: <H1>
8: The Atom Class
9: </H1>
2.9 frystyk 10: <PRE>
11: /*
2.15 frystyk 12: ** (c) COPYRIGHT MIT 1995.
2.9 frystyk 13: ** Please first read the full copyright statement in the file COPYRIGH.
14: */
15: </PRE>
2.24 frystyk 16: <P>
17: The <CODE>Atom Class defines s</CODE>trings which are given representative
18: pointer values so that they can be stored more efficiently, and comparisons
2.27 ! kahan 19: for equality done more efficiently. The list of <CODE>atoms</CODE> is stored
! 20: in a hash table, so when asking for a new atom you might in fact get back an
2.24 frystyk 21: existing one.
22: <P>
23: <B>Note</B>: There are a whole bunch of
24: <A HREF="HTFormat.html#FormatTypes">MIME-types</A> defined as
25: <CODE>atoms</CODE>, so please use them!
26: <P>
27: This module is implemented by <A HREF="HTAtom.c">HTAtom.c</A>, and it is
2.26 frystyk 28: a part of the <A HREF="http://www.w3.org/Library/"> W3C Sample Code
2.24 frystyk 29: Library</A>.
1.1 timbl 30: <PRE>
31: #ifndef HTATOM_H
32: #define HTATOM_H
33:
2.6 luotonen 34: #include "HTList.h"
35:
1.1 timbl 36: typedef struct _HTAtom HTAtom;
37: struct _HTAtom {
38: HTAtom * next;
39: char * name;
40: }; /* struct _HTAtom */
2.7 frystyk 41: </PRE>
2.24 frystyk 42: <H3>
43: Get an Atom
44: </H3>
45: <P>
46: This function returns a representative value (an <CODE>atom</CODE>) such
47: that it will always (within one run of the program) return the same value
48: for the same given string. The former is case sensitive, the latter is case
49: insensitive.
2.7 frystyk 50: <PRE>
2.21 frystyk 51: extern HTAtom * HTAtom_for (const char * string);
52: extern HTAtom * HTAtom_caseFor (const char * string);
2.7 frystyk 53: </PRE>
2.24 frystyk 54: <H3>
55: Get Content of an Atom
56: </H3>
2.7 frystyk 57: <PRE>
2.24 frystyk 58: #define HTAtom_name(a) ((a) ? (a)->name : NULL)
2.7 frystyk 59: </PRE>
2.24 frystyk 60: <P>
2.7 frystyk 61: This macro returns the string pointed to by the <CODE>atom</CODE>.
2.24 frystyk 62: <H3>
63: Search For Atoms
64: </H3>
65: <P>
66: Returns a list of <CODE>atoms</CODE> which matches the template given. It
67: is especially made for MIME-types so that for example a template like
68: <CODE>text<slash><star></CODE> returns a list of all MIME-types
69: of type <CODE>text</CODE>.
2.7 frystyk 70: <PRE>
2.21 frystyk 71: extern HTList * HTAtom_templateMatches (const char * templ);
2.10 frystyk 72: </PRE>
2.24 frystyk 73: <H3>
74: Cleanup Memory
75: </H3>
76: <P>
77: In order to cleanup memory, call this function. This is done automaticly
78: from the <A HREF="HTReq.html#Library">HTLibTerminate</A> function.
2.10 frystyk 79: <PRE>
2.20 frystyk 80: extern void HTAtom_deleteAll (void);
1.1 timbl 81:
2.7 frystyk 82: #endif
1.1 timbl 83: </PRE>
2.24 frystyk 84: <P>
85: <HR>
2.23 frystyk 86: <ADDRESS>
2.27 ! kahan 87: @(#) $Id: HTAtom.html,v 2.26 1998/05/14 02:10:15 frystyk Exp $
2.23 frystyk 88: </ADDRESS>
2.24 frystyk 89: </BODY></HTML>
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