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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 #defines from hnjalloc.h before #including other headers
#undef fopen
#undef fclose
#undef fgets
#undef feof
#undef fgetc

#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->Open(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; }