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