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eMule 0.70b vs 0.72a — Detailed Comparison Report

Date: 2026-03-29 Source directories: - eMule-0.70b/ — baseline - eMule-0.72a/ — target

Table of Contents

1. File Inventory

Metric 0.70b 0.72a
Total files ~925 ~926
Source files (.cpp/.h) ~556 ~554

Files Added in 0.72a

File Purpose
Ring.h New circular/ring buffer template class
TitledMenu.cpp / TitledMenu.h Renamed from TitleMenu.cpp/.h

Files Removed from 0.70b

File Reason
TitleMenu.cpp / TitleMenu.h Renamed to TitledMenu.cpp/.h

Language / Kademlia Files

96 language files and Kademlia core files appear to have been reorganized in directory structure; content is largely preserved.

2. Version Information

0.70b — Version.h: 

#define VERSION_MJR      0
#define VERSION_MIN      70
#define VERSION_UPDATE   1
#define VERSION_BUILD    5

0.72a — Version.h: 

#define VERSION_MJR      0
#define VERSION_MIN      72
#define VERSION_UPDATE   0
#define VERSION_BUILD    1

Platform Detection

0.70b — x64 only: 

#define VERSION_X64 _T(" x64")

0.72a — extended to include ARM64: 

#ifdef _M_X64
    #define VERSION_PLATFORM _T(" x64")
#elif _M_ARM64
    #define VERSION_PLATFORM _T(" arm64")
#else //x86
    #define VERSION_PLATFORM _T("")
#endif

3. Major Feature Additions

3.1 Ring Buffer Data Structure — Ring.h

A new circular/ring buffer template class replaces CList<> usage in the data-rate tracking subsystem. This is the most architecturally significant addition of this release.

template<class TYPE> class CRing
{
    UINT_PTR m_nCount;      // number of items added (wraps logically)
    UINT_PTR m_nIncrement;  // growth step when capacity exceeded
    UINT_PTR m_nSize;       // current buffer capacity
    TYPE    *m_pData;       // contiguous circular buffer

    // Key operations: Add(), GetAt(i), SetAt(i,v), GetCount(), IsEmpty()
};

Benefits over CList<>: - Contiguous memory — better cache locality - No per-element heap allocation/deallocation - Automatic circular overwrite when full (no explicit RemoveHead() needed) - Faster iteration and index access

3.2 ARM64 Platform Support

Explicit ARM64 detection added in Version.h and manifests updated accordingly — prepares the build system for native ARM64 Windows builds.

3.3 New Protocol Tags in Opcodes.h

Backward-compatible additions to the file tag set:

#define FT_KADAICHHASHRESULT    0x37  // <Count 1>{<Publishers 1><AICH Hash> Count}
#define FT_ENCRYPTION           0xF3  // <uint8>
#define FT_BUDDYHASH            0xF8  // <string>
#define FT_SERVERPORT           0xFA  // <uint16>
#define FT_SERVERIP             0xFB  // <uint32>
#define FT_SOURCEUPORT          0xFC  // <uint16>
#define FT_SOURCEPORT           0xFD  // <uint16>
#define FT_SOURCEIP             0xFE  // <uint32>
#define FT_SOURCETYPE           0xFF  // <uint8>

Kademlia protocol version remains at 0x0a (10) — no wire-level protocol break.

4. Major Refactoring

4.1 Data Rate Tracking: CList → CRing

This refactoring affects DownloadQueue.h/.cpp and UploadQueue.h/.cpp.

0.70b — DownloadQueue.h: 

CList<TransferredData> average_dr_list;

0.72a — DownloadQueue.h: 

CRing<TransferredData> average_dr_hist;

0.70b — UploadQueue.h (multiple separate lists): 

CList<uint64>        average_dr_list;
CList<uint64>        average_friend_dr_list;
CList<DWORD, DWORD>  average_tick_list;
CList<int, int>      activeClients_list;
CList<DWORD, DWORD>  activeClients_tick_list;

0.72a — UploadQueue.h (consolidated into typed structs + rings): 

CRing<AverageUploadRate>  average_ur_hist;
CRing<ActiveClientsData>  activeClients_hist;

New aggregate structs introduced: 

typedef struct {
    uint64  datalen;
    DWORD   timestamp;
} TransferredData;

typedef struct {
    uint64  upBytes;
    uint64  upFriendBytes;
    DWORD   timestamp;
} AverageUploadRate;

typedef struct {
    INT_PTR slots;
    DWORD   timestamp;
} ActiveClientsData;

The consolidation of parallel lists into a single ring of typed structs eliminates list-pointer synchronization bugs and simplifies iteration.

4.2 Image Handling: CxImage → HBITMAP / ATL / GDI+

The external CxImage library dependency is removed. All video preview image encoding now uses the native Windows GDI+ / ATL pipeline.

0.70b — BaseClient.cpp: 

#include "CxImage/xImage.h"

void CUpDownClient::SendPreviewAnswer(const CKnownFile *pForFile,
                                      CxImage **imgFrames, uint8 nCount)
{
    CxImage *cur_frame = imgFrames[i];
    BYTE *abyResultBuffer = NULL;
    int32_t nResultSize = 0;
    if (!cur_frame->Encode(abyResultBuffer, nResultSize, CXIMAGE_FORMAT_PNG)) {
        // error
    }
    data.WriteUInt32(nResultSize);
    data.Write(abyResultBuffer, nResultSize);
    free(abyResultBuffer);
}

0.72a — BaseClient.cpp: 

#include <atlimage.h>

void CUpDownClient::SendPreviewAnswer(const CKnownFile *pForFile,
                                      HBITMAP *imgFrames, uint8 nCount)
{
    HBITMAP bmp_frame = imgFrames[i];
    if (bmp_frame) {
        if (bSend) {
            size_t nFrameSize;
            byte *byFrameBuffer = bmp2mem(bmp_frame, nFrameSize, Gdiplus::ImageFormatPNG);
            if (byFrameBuffer) {
                data.WriteUInt32((uint32)nFrameSize);
                data.Write(byFrameBuffer, (UINT)nFrameSize);
                delete[] byFrameBuffer;
            }
        }
        ::DeleteObject(bmp_frame);     // explicit GDI object cleanup
    }
}

Impact: Removes a third-party library from the build tree; ensures consistent PNG encoding behavior via the OS-supplied GDI+ codec. Memory cleanup is now explicit (::DeleteObject).

4.3 Windows API Modernization — OtherFunctions.cpp

0.70b used a complex dynamic-loading fallback chain for SHGetFolderPath: 

HRESULT(WINAPI *pfnSHGetFolderPathW)(HWND, int, HANDLE, DWORD, LPWSTR);
(FARPROC&)pfnSHGetFolderPathW =
    GetProcAddress(GetModuleHandle(_T("shell32")), "SHGetFolderPathW");
// ... multiple fallbacks to shfolder.dll and ANSI versions

0.72a drops the compatibility shim — the function is called directly: 

TCHAR szPath[MAX_PATH];
if (SUCCEEDED(::SHGetFolderPath(NULL, iCSIDL, NULL, SHGFP_TYPE_CURRENT, szPath)))
    return CString(szPath);

This signals that support for very old Windows versions (pre-XP SP1) has been dropped.

4.4 Menu Class Rename

CTitleMenu → CTitledMenu (one letter: d added). All callsites in TransferWnd.cpp, SearchResultsWnd.cpp, and related files are updated. This is a cosmetic naming fix with no behavioral change.

4.5 Enum Underlying-Type Annotations

0.70b: 

enum EPartFileStatus { ... };
enum EPartFileOp     { ... };

0.72a — explicit storage type (C++11): 

enum EPartFileStatus : uint8 { ... };
enum EPartFileOp     : uint8 { ... };

This locks the enum's binary representation, which matters for on-disk serialization and network protocols.

5. Bug Fixes & Code Corrections

5.1 UDP Queue-Full Logic — ClientUDPSocket.cpp

The condition controlling whether to send a "queue full" reply was inverted in 0.70b due to confusing nesting.

0.70b: 

if (!bSenderMultipleIpUnknown) {
    if (theApp.uploadqueue->GetWaitingUserCount() + 50 > thePrefs.GetQueueSize()) {
        // send queue full
    }
} else
    // different path

0.72a — logic clarified: 

if (bSenderMultipleIpUnknown)
    // cannot send encrypted answer since we don't know this client
else if (theApp.uploadqueue->GetWaitingUserCount() + 50 > thePrefs.GetQueueSize()) {
    // send queue full
}

5.2 PartFile Status Check Simplification

0.70b: 

EPartFileStatus uState = GetStatus();
if ((uState == PS_PAUSED || uState == PS_INSUFFICIENT || uState == PS_ERROR) && !m_stopped && ...)

0.72a — helper function + switch: 

if (inSet(GetStatus(), PS_PAUSED, PS_INSUFFICIENT, PS_ERROR) && !m_stopped && ...)

// and elsewhere:
switch (GetStatus()) {
    case PS_ERROR:       return GetCompletionError();
    case PS_INSUFFICIENT:
    case PS_PAUSED:      return true;
}
return false;

5.3 Video Preview Start Time Comment Fix

0.70b: 

previewFile->GrabImage(4, 15, true, 450, this);
// start at 15 seconds; at 0 seconds frames usually were solid black

0.72a — float literal for clarity + updated comment: 

previewFile->GrabImage(4, 15.0, true, 450, this);
// do not start at 0 because videos commonly begin with blank screens

5.4 DrawStatusBar Parameter Change

0.70b: 

void DrawStatusBar(CDC *dc, const CRect &rect, bool bFlat);

0.72a — DC passed by reference, not pointer: 

void DrawStatusBar(CDC &dc, const CRect &rect, bool bFlat);

Eliminates a null-pointer risk at callers.

6. Code Quality / Style Improvements

6.1 Systematic :: Scoping of Win32 API Calls

A sweep across BaseClient.cpp, OtherFunctions.cpp, and others adds explicit global-namespace qualification to Win32 calls:

// 0.70b
CoInitialize(NULL);
LoadLibrary(_T("..."));
DeleteFile(pszFilePath);

// 0.72a
::CoInitialize(NULL);
::LoadLibrary(_T("..."));
::DeleteFile(pszFilePath);

Prevents accidental shadowing by class members or local overloads.

6.2 Member Variable Naming — Friend.h

0.70b 0.72a Reason
m_dwLastSeen m_tLastSeen t prefix signals time_t, not raw DWORD
m_dwLastChatted m_tLastChatted same

6.3 Private Member Visibility — DownloadListCtrl

// 0.70b
if (theApp.emuledlg->transferwnd->GetDownloadList()->curTab == 0)

// 0.72a — renamed with m_ prefix (enforces private access discipline)
if (theApp.emuledlg->transferwnd->GetDownloadList()->m_curTab == 0)

6.4 Deleted Copy/Move Constructors — Kademlia Classes

// 0.72a — CKademlia.h
class CKademlia {
    CKademlia(const CKademlia&)            = delete;
    CKademlia& operator=(const CKademlia&) = delete;
};

Prevents accidental copies of singleton-like objects; enforces correct usage at compile time.

6.5 Include Header Cleanup

0.70b 0.72a Notes
"CxImage/xImage.h" <atlimage.h> third-party → system header
<shlobj.h> <ShlObj_core.h> refined shell object header
(absent) <sys/stat.h>, <share.h> explicit POSIX/C-runtime includes

7. Protocol & Networking

  • Kademlia protocol version: unchanged at 0x0a — 0.70b and 0.72a nodes are fully compatible on the network.
  • New FT_* tags in Opcodes.h are additive; unknown tags are ignored by older clients.
  • No new opcodes or packet types introduced.
  • UDP logic fix (§5.1) corrects a latent condition that could send incorrect queue-full responses.

8. UI / UX

Area Change
Context menus CTitleMenu → CTitledMenu rename throughout
Transfer window curTab → m_curTab (access-discipline change)
Search results Updated menu creation to use CTitledMenu
No new dialogs, panels, or visible features added in this release —

9. Security Notes

No regressions introduced. Positive changes:

Change Security Impact
Ring buffer replaces linked list Reduces heap-fragmentation attack surface
Explicit :: Win32 scoping Prevents accidental local-override of security-critical APIs
::DeleteObject after HBITMAP use Eliminates GDI handle leak
= delete copy constructors Prevents unintended object slicing in crypto/Kademlia code
SHGetFolderPath direct call Removes dynamic LoadLibrary code path that could be hijacked

10. Key Changed Files (Summary)

File Nature of Change
Version.h Version bump, ARM64 platform detection
Ring.h New — circular buffer template
DownloadQueue.h/.cpp CList → CRing for rate history
UploadQueue.h/.cpp CList → CRing, struct consolidation
BaseClient.cpp CxImage → HBITMAP/ATL/GDI+, :: scoping
OtherFunctions.cpp SHGetFolderPath simplification, API scoping
PartFile.h/.cpp Enum typed storage, DrawStatusBar ref fix, status helpers
ClientUDPSocket.cpp Queue-full logic fix
Friend.h dw → t prefix for time variables
Opcodes.h New FT_* tags (backward compatible)
TitledMenu.h/.cpp Renamed from TitleMenu
TransferWnd.cpp Menu rename, m_curTab access
SearchResultsWnd.cpp Menu rename
Kademlia/Kademlia.h = delete copy semantics

11. Overall Development Trend

The 0.70b → 0.72a transition is best characterised as a focused modernisation and cleanup release, not a feature release:

  1. Performance — the CList → CRing refactoring in data-rate tracking is the headline change; it removes per-tick heap allocations in hot paths.
  2. Dependency reduction — CxImage is excised; the build tree shrinks and the Windows-native GDI+ codec path gains consistency.
  3. Build portability — ARM64 support is wired in, positioning the project for native Windows-on-ARM builds.
  4. Code hygiene — :: scoping, = delete constructors, typed enums, m_ prefix discipline, and reference-vs-pointer corrections reduce latent bugs.
  5. Legacy removal — Win9x/WinME compatibility shims (SHGetFolderPath dynamic load fallback) are dropped, simplifying OS-interaction code.
  6. Protocol stability — Kademlia version and all core opcodes are unchanged; this is a fully backward-compatible release on the network.

In short: 0.72a makes eMule faster in its data-rate bookkeeping, lighter on third-party dependencies, and cleaner in its C++ style — while leaving the network protocol and user-visible feature set essentially intact.