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/* -*- 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/ResultExtensions.h"
#include "mozilla/URLPreloader.h"
using namespace mozilla;
nsresult nsINIParser::Init(nsIFile* aFile) {
nsCString result;
MOZ_TRY_VAR(result, URLPreloader::ReadFile(aFile));
return InitFromString(result);
}
static const char kNL[] = "\r\n";
static const char kEquals[] = "=";
static const char kWhitespace[] = " \t";
static const char kRBracket[] = "]";
nsresult nsINIParser::InitFromString(const nsCString& aStr) {
nsCString fileContents;
char* buffer;
if (StringHead(aStr, 3) == "\xEF\xBB\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.
fileContents.Append(aStr);
buffer = fileContents.BeginWriting() + 3;
} else {
if (StringHead(aStr, 2) == "\xFF\xFE") {
// Someone set us up the Utf-16LE BOM
nsDependentSubstring str(reinterpret_cast<const char16_t*>(aStr.get()),
aStr.Length() / 2);
AppendUTF16toUTF8(Substring(str, 1), fileContents);
} else {
fileContents.Append(aStr);
}
buffer = fileContents.BeginWriting();
}
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;
}
SetString(currSection, key, token);
}
return NS_OK;
}
bool nsINIParser::IsValidSection(const char* aSection) {
if (aSection[0] == '\0') {
return false;
}
const char* found = strpbrk(aSection, "\r\n[]");
return found == nullptr;
}
bool nsINIParser::IsValidKey(const char* aKey) {
if (aKey[0] == '\0') {
return false;
}
const char* found = strpbrk(aKey, "\r\n=");
return found == nullptr;
}
bool nsINIParser::IsValidValue(const char* aValue) {
const char* found = strpbrk(aValue, "\r\n");
return found == nullptr;
}
nsresult nsINIParser::GetString(const char* aSection, const char* aKey,
nsACString& aResult) {
if (!IsValidSection(aSection) || !IsValidKey(aKey)) {
return NS_ERROR_INVALID_ARG;
}
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) {
if (!IsValidSection(aSection) || !IsValidKey(aKey)) {
return NS_ERROR_INVALID_ARG;
}
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 (const auto& key : mSections.Keys()) {
if (!aCB(key, aClosure)) {
break;
}
}
return NS_OK;
}
nsresult nsINIParser::GetStrings(const char* aSection, INIStringCallback aCB,
void* aClosure) {
if (!IsValidSection(aSection)) {
return NS_ERROR_INVALID_ARG;
}
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;
}
nsresult nsINIParser::SetString(const char* aSection, const char* aKey,
const char* aValue) {
if (!IsValidSection(aSection) || !IsValidKey(aKey) || !IsValidValue(aValue)) {
return NS_ERROR_INVALID_ARG;
}
mSections.WithEntryHandle(aSection, [&](auto&& entry) {
if (!entry) {
entry.Insert(MakeUnique<INIValue>(aKey, aValue));
return;
}
INIValue* v = entry->get();
// Check whether this key has already been specified; overwrite
// if so, or append if not.
while (v) {
if (!strcmp(aKey, v->key)) {
v->SetValue(aValue);
break;
}
if (!v->next) {
v->next = MakeUnique<INIValue>(aKey, aValue);
break;
}
v = v->next.get();
}
NS_ASSERTION(v, "v should never be null coming out of this loop");
});
return NS_OK;
}
nsresult nsINIParser::DeleteString(const char* aSection, const char* aKey) {
if (!IsValidSection(aSection) || !IsValidKey(aKey)) {
return NS_ERROR_INVALID_ARG;
}
INIValue* val;
if (!mSections.Get(aSection, &val)) {
return NS_ERROR_FAILURE;
}
// Special case the first result
if (strcmp(val->key, aKey) == 0) {
if (!val->next) {
mSections.Remove(aSection);
} else {
mSections.InsertOrUpdate(aSection, std::move(val->next));
delete val;
}
return NS_OK;
}
while (val->next) {
if (strcmp(val->next->key, aKey) == 0) {
val->next = std::move(val->next->next);
return NS_OK;
}
val = val->next.get();
}
return NS_ERROR_FAILURE;
}
nsresult nsINIParser::DeleteSection(const char* aSection) {
if (!IsValidSection(aSection)) {
return NS_ERROR_INVALID_ARG;
}
if (!mSections.Remove(aSection)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult nsINIParser::RenameSection(const char* aSection,
const char* aNewName) {
if (!IsValidSection(aSection) || !IsValidSection(aNewName)) {
return NS_ERROR_INVALID_ARG;
}
if (mSections.Contains(aNewName)) {
return NS_ERROR_ILLEGAL_VALUE;
}
mozilla::UniquePtr<INIValue> val;
if (mSections.Remove(aSection, &val)) {
mSections.InsertOrUpdate(aNewName, std::move(val));
} else {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult nsINIParser::WriteToFile(nsIFile* aFile) {
nsCString buffer;
for (const auto& entry : mSections) {
buffer.AppendPrintf("[%s]\n", entry.GetKey());
INIValue* val = entry.GetWeak();
while (val) {
buffer.AppendPrintf("%s=%s\n", val->key, val->value);
val = val->next.get();
}
buffer.AppendLiteral("\n");
}
FILE* writeFile;
nsresult rv = aFile->OpenANSIFileDesc("w", &writeFile);
NS_ENSURE_SUCCESS(rv, rv);
unsigned int length = buffer.Length();
if (fwrite(buffer.get(), sizeof(char), length, writeFile) != length) {
fclose(writeFile);
return NS_ERROR_UNEXPECTED;
}
fclose(writeFile);
return NS_OK;
}