gecko-dev/xpcom/glue/nsINIParser.cpp

332 lines
7.5 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
// Moz headers (alphabetical)
#include "nsCRTGlue.h"
#include "nsError.h"
#include "nsIFile.h"
#include "nsINIParser.h"
#include "mozilla/FileUtils.h" // AutoFILE
// System headers (alphabetical)
#include <stdio.h>
#include <stdlib.h>
#ifdef XP_WIN
#include <windows.h>
#endif
#if defined(XP_WIN)
#define READ_BINARYMODE L"rb"
#else
#define READ_BINARYMODE "r"
#endif
using namespace mozilla;
#ifdef XP_WIN
inline FILE*
TS_tfopen(const char* aPath, const wchar_t* aMode)
{
wchar_t wPath[MAX_PATH];
MultiByteToWideChar(CP_UTF8, 0, aPath, -1, wPath, MAX_PATH);
return _wfopen(wPath, aMode);
}
#else
inline FILE*
TS_tfopen(const char* aPath, const char* aMode)
{
return fopen(aPath, aMode);
}
#endif
// Stack based FILE wrapper to ensure that fclose is called, copied from
// toolkit/mozapps/update/updater/readstrings.cpp
class AutoFILE
{
public:
explicit AutoFILE(FILE* aFp = nullptr) : fp_(aFp) {}
~AutoFILE()
{
if (fp_) {
fclose(fp_);
}
}
operator FILE*() { return fp_; }
FILE** operator&() { return &fp_; }
void operator=(FILE* aFp) { fp_ = aFp; }
private:
FILE* fp_;
};
nsresult
nsINIParser::Init(nsIFile* aFile)
{
/* open the file. Don't use OpenANSIFileDesc, because you mustn't
pass FILE* across shared library boundaries, which may be using
different CRTs */
AutoFILE fd;
#ifdef XP_WIN
nsAutoString path;
nsresult rv = aFile->GetPath(path);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
fd = _wfopen(path.get(), READ_BINARYMODE);
#else
nsAutoCString path;
aFile->GetNativePath(path);
fd = fopen(path.get(), READ_BINARYMODE);
#endif
if (!fd) {
return NS_ERROR_FAILURE;
}
return InitFromFILE(fd);
}
nsresult
nsINIParser::Init(const char* aPath)
{
/* open the file */
AutoFILE fd(TS_tfopen(aPath, READ_BINARYMODE));
if (!fd) {
return NS_ERROR_FAILURE;
}
return InitFromFILE(fd);
}
static const char kNL[] = "\r\n";
static const char kEquals[] = "=";
static const char kWhitespace[] = " \t";
static const char kRBracket[] = "]";
nsresult
nsINIParser::InitFromFILE(FILE* aFd)
{
/* get file size */
if (fseek(aFd, 0, SEEK_END) != 0) {
return NS_ERROR_FAILURE;
}
long flen = ftell(aFd);
/* zero-sized file, or an error */
if (flen <= 0) {
return NS_ERROR_FAILURE;
}
/* malloc an internal buf the size of the file */
mFileContents = MakeUnique<char[]>(flen + 2);
if (!mFileContents) {
return NS_ERROR_OUT_OF_MEMORY;
}
/* read the file in one swoop */
if (fseek(aFd, 0, SEEK_SET) != 0) {
return NS_BASE_STREAM_OSERROR;
}
int rd = fread(mFileContents.get(), sizeof(char), flen, aFd);
if (rd != flen) {
return NS_BASE_STREAM_OSERROR;
}
// We write a UTF16 null so that the file is easier to convert to UTF8
mFileContents[flen] = mFileContents[flen + 1] = '\0';
char* buffer = &mFileContents[0];
if (flen >= 3 &&
mFileContents[0] == '\xEF' &&
mFileContents[1] == '\xBB' &&
mFileContents[2] == '\xBF') {
// Someone set us up the Utf-8 BOM
// This case is easy, since we assume that BOM-less
// files are Utf-8 anyway. Just skip the BOM and process as usual.
buffer = &mFileContents[3];
}
#ifdef XP_WIN
if (flen >= 2 &&
mFileContents[0] == '\xFF' &&
mFileContents[1] == '\xFE') {
// Someone set us up the Utf-16LE BOM
buffer = &mFileContents[2];
// Get the size required for our Utf8 buffer
flen = WideCharToMultiByte(CP_UTF8,
0,
reinterpret_cast<LPWSTR>(buffer),
-1,
nullptr,
0,
nullptr,
nullptr);
if (flen == 0) {
return NS_ERROR_FAILURE;
}
UniquePtr<char[]> utf8Buffer(new char[flen]);
if (WideCharToMultiByte(CP_UTF8, 0, reinterpret_cast<LPWSTR>(buffer), -1,
utf8Buffer.get(), flen, nullptr, nullptr) == 0) {
return NS_ERROR_FAILURE;
}
mFileContents = Move(utf8Buffer);
buffer = mFileContents.get();
}
#endif
char* currSection = nullptr;
// outer loop tokenizes into lines
while (char* token = NS_strtok(kNL, &buffer)) {
if (token[0] == '#' || token[0] == ';') { // it's a comment
continue;
}
token = (char*)NS_strspnp(kWhitespace, token);
if (!*token) { // empty line
continue;
}
if (token[0] == '[') { // section header!
++token;
currSection = token;
char* rb = NS_strtok(kRBracket, &token);
if (!rb || NS_strtok(kWhitespace, &token)) {
// there's either an unclosed [Section or a [Section]Moretext!
// we could frankly decide that this INI file is malformed right
// here and stop, but we won't... keep going, looking for
// a well-formed [section] to continue working with
currSection = nullptr;
}
continue;
}
if (!currSection) {
// If we haven't found a section header (or we found a malformed
// section header), don't bother parsing this line.
continue;
}
char* key = token;
char* e = NS_strtok(kEquals, &token);
if (!e || !token) {
continue;
}
INIValue* v;
if (!mSections.Get(currSection, &v)) {
v = new INIValue(key, token);
if (!v) {
return NS_ERROR_OUT_OF_MEMORY;
}
mSections.Put(currSection, v);
continue;
}
// Check whether this key has already been specified; overwrite
// if so, or append if not.
while (v) {
if (!strcmp(key, v->key)) {
v->value = token;
break;
}
if (!v->next) {
v->next = MakeUnique<INIValue>(key, token);
if (!v->next) {
return NS_ERROR_OUT_OF_MEMORY;
}
break;
}
v = v->next.get();
}
NS_ASSERTION(v, "v should never be null coming out of this loop");
}
return NS_OK;
}
nsresult
nsINIParser::GetString(const char* aSection, const char* aKey,
nsACString& aResult)
{
INIValue* val;
mSections.Get(aSection, &val);
while (val) {
if (strcmp(val->key, aKey) == 0) {
aResult.Assign(val->value);
return NS_OK;
}
val = val->next.get();
}
return NS_ERROR_FAILURE;
}
nsresult
nsINIParser::GetString(const char* aSection, const char* aKey,
char* aResult, uint32_t aResultLen)
{
INIValue* val;
mSections.Get(aSection, &val);
while (val) {
if (strcmp(val->key, aKey) == 0) {
strncpy(aResult, val->value, aResultLen);
aResult[aResultLen - 1] = '\0';
if (strlen(val->value) >= aResultLen) {
return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
}
return NS_OK;
}
val = val->next.get();
}
return NS_ERROR_FAILURE;
}
nsresult
nsINIParser::GetSections(INISectionCallback aCB, void* aClosure)
{
for (auto iter = mSections.Iter(); !iter.Done(); iter.Next()) {
if (!aCB(iter.Key(), aClosure)) {
break;
}
}
return NS_OK;
}
nsresult
nsINIParser::GetStrings(const char* aSection,
INIStringCallback aCB, void* aClosure)
{
INIValue* val;
for (mSections.Get(aSection, &val);
val;
val = val->next.get()) {
if (!aCB(val->key, val->value, aClosure)) {
return NS_OK;
}
}
return NS_OK;
}