зеркало из https://github.com/mozilla/gecko-dev.git
120 строки
3.0 KiB
C++
120 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// This file provides substitutes for the basic stdio routines used by hyphen.c
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// to read its dictionary files. We #define the stdio names to these versions
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// in hnjalloc.h, so that we can use nsIURI and nsIInputStream to specify and
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// access the dictionary resources.
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#include "hnjalloc.h"
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#undef FILE // Undo the damage done in hnjalloc.h
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#include "nsNetUtil.h"
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#include "nsIInputStream.h"
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#include "nsIURI.h"
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#include "nsContentUtils.h"
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#define BUFSIZE 1024
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struct hnjFile_ {
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nsCOMPtr<nsIInputStream> mStream;
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char mBuffer[BUFSIZE];
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uint32_t mCurPos;
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uint32_t mLimit;
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};
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// replacement for fopen()
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// (not a full substitute: only supports read access)
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hnjFile*
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hnjFopen(const char* aURISpec, const char* aMode)
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{
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// this override only needs to support "r"
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NS_ASSERTION(!strcmp(aMode, "r"), "unsupported fopen() mode in hnjFopen");
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nsCOMPtr<nsIURI> uri;
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nsresult rv = NS_NewURI(getter_AddRefs(uri), aURISpec);
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if (NS_FAILED(rv)) {
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return nullptr;
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}
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nsCOMPtr<nsIChannel> channel;
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rv = NS_NewChannel(getter_AddRefs(channel),
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uri,
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nsContentUtils::GetSystemPrincipal(),
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nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
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nsIContentPolicy::TYPE_OTHER);
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if (NS_FAILED(rv)) {
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return nullptr;
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}
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nsCOMPtr<nsIInputStream> instream;
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rv = channel->Open2(getter_AddRefs(instream));
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if (NS_FAILED(rv)) {
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return nullptr;
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}
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hnjFile *f = new hnjFile;
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f->mStream = instream;
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f->mCurPos = 0;
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f->mLimit = 0;
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return f;
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}
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// replacement for fclose()
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int
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hnjFclose(hnjFile* f)
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{
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NS_ASSERTION(f && f->mStream, "bad argument to hnjFclose");
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int result = 0;
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nsresult rv = f->mStream->Close();
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if (NS_FAILED(rv)) {
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result = EOF;
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}
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f->mStream = nullptr;
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delete f;
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return result;
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}
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// replacement for fgets()
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// (not a full reimplementation, but sufficient for libhyphen's needs)
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char*
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hnjFgets(char* s, int n, hnjFile* f)
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{
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NS_ASSERTION(s && f, "bad argument to hnjFgets");
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int i = 0;
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while (i < n - 1) {
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if (f->mCurPos < f->mLimit) {
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char c = f->mBuffer[f->mCurPos++];
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s[i++] = c;
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if (c == '\n' || c == '\r') {
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break;
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}
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continue;
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}
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f->mCurPos = 0;
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nsresult rv = f->mStream->Read(f->mBuffer, BUFSIZE, &f->mLimit);
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if (NS_FAILED(rv)) {
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f->mLimit = 0;
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return nullptr;
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}
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if (f->mLimit == 0) {
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break;
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}
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}
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if (i == 0) {
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return nullptr; // end of file
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}
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s[i] = '\0'; // null-terminate the returned string
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return s;
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}
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