1 : /* ***** BEGIN LICENSE BLOCK *****
2 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
3 : *
4 : * The contents of this file are subject to the Mozilla Public License Version
5 : * 1.1 (the "License"); you may not use this file except in compliance with
6 : * the License. You may obtain a copy of the License at
7 : * http://www.mozilla.org/MPL/
8 : *
9 : * Software distributed under the License is distributed on an "AS IS" basis,
10 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11 : * for the specific language governing rights and limitations under the
12 : * License.
13 : *
14 : * The Original Code is Mozilla Hyphenation Service.
15 : *
16 : * The Initial Developer of the Original Code is
17 : * Mozilla Foundation.
18 : * Portions created by the Initial Developer are Copyright (C) 2011
19 : * the Initial Developer. All Rights Reserved.
20 : *
21 : * Contributor(s):
22 : * Jonathan Kew <jfkthame@gmail.com>
23 : *
24 : * Alternatively, the contents of this file may be used under the terms of
25 : * either the GNU General Public License Version 2 or later (the "GPL"), or
26 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 : * in which case the provisions of the GPL or the LGPL are applicable instead
28 : * of those above. If you wish to allow use of your version of this file only
29 : * under the terms of either the GPL or the LGPL, and not to allow others to
30 : * use your version of this file under the terms of the MPL, indicate your
31 : * decision by deleting the provisions above and replace them with the notice
32 : * and other provisions required by the GPL or the LGPL. If you do not delete
33 : * the provisions above, a recipient may use your version of this file under
34 : * the terms of any one of the MPL, the GPL or the LGPL.
35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : // This file provides substitutes for the basic stdio routines used by hyphen.c
39 : // to read its dictionary files. We #define the stdio names to these versions
40 : // in hnjalloc.h, so that we can use nsIURI and nsIInputStream to specify and
41 : // access the dictionary resources.
42 :
43 : #include "hnjalloc.h"
44 : #include "nsNetUtil.h"
45 :
46 : #define BUFSIZE 1024
47 :
48 0 : struct hnjFile_ {
49 : nsCOMPtr<nsIInputStream> mStream;
50 : char mBuffer[BUFSIZE];
51 : PRUint32 mCurPos;
52 : PRUint32 mLimit;
53 : };
54 :
55 : // replacement for fopen()
56 : // (not a full substitute: only supports read access)
57 : hnjFile*
58 0 : hnjFopen(const char* aURISpec, const char* aMode)
59 : {
60 : // this override only needs to support "r"
61 0 : NS_ASSERTION(!strcmp(aMode, "r"), "unsupported fopen() mode in hnjFopen");
62 :
63 0 : nsCOMPtr<nsIURI> uri;
64 0 : nsresult rv = NS_NewURI(getter_AddRefs(uri), aURISpec);
65 0 : if (NS_FAILED(rv)) {
66 0 : return nsnull;
67 : }
68 :
69 0 : nsCOMPtr<nsIInputStream> instream;
70 0 : rv = NS_OpenURI(getter_AddRefs(instream), uri);
71 0 : if (NS_FAILED(rv)) {
72 0 : return nsnull;
73 : }
74 :
75 0 : hnjFile *f = new hnjFile;
76 0 : f->mStream = instream;
77 0 : f->mCurPos = 0;
78 0 : f->mLimit = 0;
79 :
80 0 : return f;
81 : }
82 :
83 : // replacement for fclose()
84 : int
85 0 : hnjFclose(hnjFile* f)
86 : {
87 0 : NS_ASSERTION(f && f->mStream, "bad argument to hnjFclose");
88 :
89 0 : int result = 0;
90 0 : nsresult rv = f->mStream->Close();
91 0 : if (NS_FAILED(rv)) {
92 0 : result = EOF;
93 : }
94 0 : f->mStream = nsnull;
95 :
96 0 : delete f;
97 0 : return result;
98 : }
99 :
100 : // replacement for fgets()
101 : // (not a full reimplementation, but sufficient for libhyphen's needs)
102 : char*
103 0 : hnjFgets(char* s, int n, hnjFile* f)
104 : {
105 0 : NS_ASSERTION(s && f, "bad argument to hnjFgets");
106 :
107 0 : int i = 0;
108 0 : while (i < n - 1) {
109 0 : if (f->mCurPos < f->mLimit) {
110 0 : char c = f->mBuffer[f->mCurPos++];
111 0 : s[i++] = c;
112 0 : if (c == '\n' || c == '\r') {
113 0 : break;
114 : }
115 0 : continue;
116 : }
117 :
118 0 : f->mCurPos = 0;
119 :
120 0 : nsresult rv = f->mStream->Read(f->mBuffer, BUFSIZE, &f->mLimit);
121 0 : if (NS_FAILED(rv)) {
122 0 : f->mLimit = 0;
123 0 : return nsnull;
124 : }
125 :
126 0 : if (f->mLimit == 0) {
127 0 : break;
128 : }
129 : }
130 :
131 0 : if (i == 0) {
132 0 : return nsnull; // end of file
133 : }
134 :
135 0 : s[i] = '\0'; // null-terminate the returned string
136 0 : return s;
137 : }
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