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-rw-r--r--xpcom/base/nsINIParser.cpp324
1 files changed, 324 insertions, 0 deletions
diff --git a/xpcom/base/nsINIParser.cpp b/xpcom/base/nsINIParser.cpp
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+++ b/xpcom/base/nsINIParser.cpp
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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;
+
+ WriteToString(buffer);
+
+ 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;
+}
+
+void nsINIParser::WriteToString(nsACString& aOutput) {
+ for (const auto& entry : mSections) {
+ aOutput.AppendPrintf("[%s]\n", entry.GetKey());
+ INIValue* val = entry.GetWeak();
+ while (val) {
+ aOutput.AppendPrintf("%s=%s\n", val->key, val->value);
+ val = val->next.get();
+ }
+ aOutput.AppendLiteral("\n");
+ }
+}
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