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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "CacheDir.h"
#include "FileSystem.h"
#include <stdio.h>
#include <string>
// as defiend here: http://www.brynosaurus.com/cachedir/spec.html
const std::string CacheDir::tagFile_name = "CACHEDIR.TAG";
const std::string CacheDir::tagFile_content = "Signature: 8a477f597d28d172789f06886806bc55";
const size_t CacheDir::tagFile_content_size = 43;
const std::string CacheDir::defaultAdditionalText = "# This file is a cache directory tag created by Spring.\n"
"# For information about cache directory tags, see:\n"
"# http://www.brynosaurus.com/cachedir/";
bool CacheDir::IsCacheDir(const std::string& dir) {
const std::string cacheFile = GetCacheTagFilePath(dir);
bool isTagged = CacheDir::FileContentStartsWith(cacheFile, CacheDir::tagFile_content, CacheDir::tagFile_content_size);
return isTagged;
}
bool CacheDir::SetCacheDir(const std::string& dir, bool wantedCacheState, const std::string& additionalText, bool forceRewrite) {
bool requestedStatePresent = false;
const bool currentCacheState = CacheDir::IsCacheDir(dir);
const std::string cacheFile = GetCacheTagFilePath(dir);
if (currentCacheState == wantedCacheState) {
// requested state was already present
if (wantedCacheState && forceRewrite) {
requestedStatePresent = CacheDir::WriteCacheTagFile(cacheFile, additionalText);
} else {
requestedStatePresent = true;
}
} else {
// we have to swap the state
if (wantedCacheState) {
requestedStatePresent = CacheDir::WriteCacheTagFile(cacheFile, additionalText);
} else {
requestedStatePresent = FileSystem::DeleteFile(cacheFile);
}
}
return requestedStatePresent;
}
bool CacheDir::FileContentStartsWith(const std::string& filePath, const std::string& content, size_t content_size) {
bool startsWith = false;
FILE* fileH = ::fopen(filePath.c_str(), "r");
if (fileH != NULL) {
content_size = ((content_size > content.size()) ? content.size() : content_size);
char currFileChar;
size_t i = 0;
startsWith = true;
while (((currFileChar = fgetc(fileH)) != EOF) && (i < content_size)) {
if (currFileChar != content[i]) {
startsWith = false;
break;
}
i++;
}
fclose(fileH);
}
return startsWith;
}
bool CacheDir::WriteCacheTagFile(const std::string& filePath, const std::string& additionalText) {
bool fileWritten = false;
FILE* fileH = ::fopen(filePath.c_str(), "w");
if (fileH != NULL) {
int ret;
ret = fputs(CacheDir::tagFile_content.c_str(), fileH);
if (!additionalText.empty() && (ret != EOF)) {
ret = fputs("\n", fileH);
if (ret != EOF) {
ret = fputs(additionalText.c_str(), fileH);
}
}
fileWritten = (ret != EOF);
fclose(fileH);
}
return fileWritten;
}
std::string CacheDir::GetCacheTagFilePath(const std::string& dir) {
std::string cacheFile = dir;
FileSystem::EnsurePathSepAtEnd(cacheFile);
cacheFile = cacheFile + CacheDir::tagFile_name;
return cacheFile;
}
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