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Port minecraft.jar version detection to Qt

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This commit is contained in:
Orochimarufan 2013-02-24 17:06:00 +01:00
parent ad70e3fd4c
commit ce867d9169
3 changed files with 101 additions and 66 deletions
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12
java/constants.h
View File

@ -7,7 +7,7 @@ namespace java
class constant
{
public:
enum type_t:uint8_t
enum type_t : uint8_t
{
j_hole = 0, // HACK: this is a hole in the array, because java is crazy
j_string_data = 1,
@ -22,6 +22,7 @@ namespace java
j_interface_methodref = 11,
j_nameandtype = 12
} type;
constant(util::membuffer & buf )
{
buf.read(type);
@ -66,10 +67,12 @@ namespace java
break;
}
}
constant(int fake)
{
type = j_hole;
}
std::string toString()
{
std::ostringstream ss;
@ -142,7 +145,8 @@ namespace java
uint16_t descriptor_index;
} name_and_type;
};
};
};
/**
* A helper class that represents the custom container used in Java class file for storage of constants
*/
@ -181,7 +185,7 @@ namespace java
index++;
}
}
};
}
typedef std::vector<java::constant> container_type;
/**
* Access constants based on jar file index numbers (index of the first element is 1)
@ -204,5 +208,5 @@ namespace java
}
private:
container_type constants;
};
};
}

126
java/javautils.cpp
View File

@ -1,69 +1,81 @@
/* Copyright 2013 MultiMC Contributors
*
* Authors: Orochimarufan <orochimarufan.x3@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "multimc_pragma.h"
#include "classfile.h"
#include "javautils.h"
//#include <wx/zipstrm.h>
#include <memory>
//#include <wx/wfstream.h>
//#include "mcversionlist.h"
#include <QFile>
#include <quazipfile.h>
namespace javautils
{
QString GetMinecraftJarVersion(QString jar)
QString GetMinecraftJarVersion(QString jarName)
{
return "Unknown";
/*
wxString fullpath = jar.GetFullPath();
wxString version = MCVer_Unknown;
if(!jar.FileExists())
return version;
std::auto_ptr<wxZipEntry> entry;
// convert the local name we are looking for into the internal format
wxString name = wxZipEntry::GetInternalName("net/minecraft/client/Minecraft.class",wxPATH_UNIX);
QString version = MCVer_Unknown;
// open the zip
wxFFileInputStream inStream(jar.GetFullPath());
wxZipInputStream zipIn(inStream);
// check if minecraft.jar exists
QFile jar(jarName);
if (!jar.exists())
return version;
// call GetNextEntry() until the required internal name is found
do
{
entry.reset(zipIn.GetNextEntry());
}
while (entry.get() != NULL && entry->GetInternalName() != name);
auto myentry = entry.get();
if (myentry == NULL)
return version;
// open minecraft.jar
QuaZip zip(&jar);
if (!zip.open(QuaZip::mdUnzip))
return version;
// we got the entry, read the data
std::size_t size = myentry->GetSize();
char *classdata = new char[size];
zipIn.Read(classdata,size);
try
{
char * temp = classdata;
java::classfile Minecraft_jar(temp,size);
auto cnst = Minecraft_jar.constants;
auto iter = cnst.begin();
while (iter != cnst.end())
{
const java::constant & constant = *iter;
if(constant.type != java::constant::j_string_data)
{
iter++;
continue;
}
auto & str = constant.str_data;
const char * lookfor = "Minecraft Minecraft "; // length = 20
if(str.compare(0,20,lookfor) == 0)
{
version = str.substr(20).data();
break;
}
iter++;
}
} catch(java::classfile_exception &){}
delete[] classdata;
return version;
*/
// open Minecraft.class
zip.setCurrentFile("net/minecraft/client/Minecraft.class", QuaZip::csSensitive);
QuaZipFile Minecraft(&zip);
if (!Minecraft.open(QuaZipFile::ReadOnly))
return version;
// read Minecraft.class
qint64 size = Minecraft.size();
char *classfile = new char[size];
Minecraft.read(classfile, size);
// parse Minecraft.class
try {
char *temp = classfile;
java::classfile MinecraftClass(temp, size);
java::constant_pool constants = MinecraftClass.constants;
for(java::constant_pool::container_type::const_iterator iter=constants.begin();
iter != constants.end(); iter++)
{
const java::constant & constant = *iter;
if (constant.type != java::constant::j_string_data)
continue;
const std::string & str = constant.str_data;
if (str.compare(0, 20, "Minecraft Minecraft ") == 0)
{
version = str.substr(20).data();
break;
}
}
} catch(java::classfile_exception &) {}
// clean up
delete[] classfile;
Minecraft.close();
zip.close();
jar.close();
return version;
}
}

23
java/javautils.h
View File

@ -1,9 +1,28 @@
/* Copyright 2013 MultiMC Contributors
*
* Authors: Orochimarufan <orochimarufan.x3@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <QString>
#define MCVer_Unknown "Unknown"
namespace javautils
{
/*
* Get the version from a minecraft.jar by parsing its class files. Expensive!
/**
* @brief Get the version from a minecraft.jar by parsing its class files. Expensive!
*/
QString GetMinecraftJarVersion(QString jar);
}