FileForums - ISApexEx - Unified API for 7z / FreeArc / RAR Extraction and Xdelta3 Patching

ISApexEx v0.1 beta
Unified Archive Extraction & Xdelta3 Patching API for Inno Setup
7-Zip · FreeArc · RAR · Xdelta3 — one DLL · Win32 · by BLACKFIRE69

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▌ OVERVIEW
ISApexEx is a high-performance unified library crafted for Inno Setup. It integrates four engines — 7-Zip, FreeArc, RAR, and Xdelta3 — into a single DLL with seamless cross-format progress tracking. Mix and match .7z, .zip, .arc, .bf, .rar and xdelta3 patch operations in one installer with continuous progress across all of them.

▌ TECHNICAL SPECIFICATIONS

Version — v0.1 beta
Author — BLACKFIRE69
Build — 6A20C000
File Size — 291 KB
Compatibility — Inno Setup v6.0 or later (Required)

Code:

╭──────────┬──────────┬──────────────────────┬─────────────────────────────╮

│ Engine   │ Version  │ Native DLL           │ Supported Extensions        │

├──────────┼──────────┼──────────────────────┼─────────────────────────────┤

│ 7-Zip    │ v26.10   │ 7z_32.dll            │ .7z, .zip, .7z.001/.002...  │

│ FreeArc  │ v0.67    │ UnArc_32.dll         │ .arc, .bf...                │

│ UnRAR    │ v7.22    │ UnRAR_32.dll         │ .rar, .part01.rar...        │

│ xdelta3  │ v0.1     │ xdelta3_wrapper.dll  │ .xd3, .xdelta, .vcdiff...   │

╰──────────┴──────────┴──────────────────────┴─────────────────────────────╯

Disk-spanning (FreeArc 'diskspan' volumes — setup-1.bin, setup-2.bin …): handled by cls-diskspan v2.0 (modified edition) natively — no ClsFunc* calls needed from your script.

▌ KEY FEATURES

✦ Unified Multi-Format Support
Handle .7z, .zip, .arc, .bf, .rar and xdelta3 patches from one DLL. Format is auto-detected from the file extension — no manual engine selection.

✦ Top-Level AND Split / Multi-Volume Support
Every format extracts both as a single top-level archive and as a split set: 7z split volumes (.7z.001…), RAR multi-volume (.partNN.rar / .rNN), FreeArc disk-span volumes. Parts may even be scattered across different folders or discs.

✦ Universal File Browsing (Locate a Missing Archive or Part)
When ISApexEx can't find a file it needs — a top-level archive of ANY format, a 7z split part, a RAR volume, or a FreeArc spanned volume — it lets the user locate it, then resumes. Built-in native browse dialog, or your own themed dialog via ISApexExSetDiskRequestCallback (one callback covers every case).

✦ Lazy DLL Loading
Only the native engine DLLs actually needed are loaded at runtime. Using only .7z and .rar? UnArc_32.dll and xdelta3_wrapper.dll are never touched.

✦ Cross-Format Progress
Overall progress (0–1000) spans all registered disks regardless of format. A mixed .arc + .7z + .rar + xdelta3 setup shows one smooth, continuous bar.

✦ Custom Extension Mapping
Archives don't have to use standard extensions — map any extension to any engine via ISApexExRegisterExtension before adding disks.

Code:

ISApexExRegisterExtension('.bin', APEX_ARC_7Z);   // .bin -> 7z engine

ISApexExRegisterExtension('.cp',  APEX_ARC_ARC);  // .cp  -> FreeArc engine

ISApexExRegisterExtension('.dat', APEX_ARC_RAR);  // .dat -> RAR engine

✦ Advanced Progress Tracking
Real-time Overall Progress, Current Disk Progress, and Extracted/Total File Counts.

✦ Performance Metrics
Accurate Current and Average Speed (MB/s).

✦ Time Management
"Time Remaining" + "Elapsed Time" with three display formats (00:00:00 / x hr y min / x hours y minutes).

✦ Process Control
Suspend, Resume, or Stop the extraction safely at any point.

✦ UI Stability
"Calc Accuracy" reduction logic prevents erratic jumping in speed and ETA displays.

✦ Localization
Switch languages at runtime via external .ini files. Ships with English and Russian.

✦ Event Callback System
Optional callback fires on discrete lifecycle events — engine loaded, disk started/finished/failed, error, all done. Great for logging and diagnostics.

✦ File-Based Logging
Thread-safe logging with configurable verbosity (Off, Error, Info, Verbose).

✦ Thread Priority Control
Set extraction thread priority before each disk (Idle … Highest).

✦ Disk Space Pre-Check
Verify free space on the output drive before extraction — per-disk or all disks at once.

✦ Progress Persistence / Resume (Crash Recovery)
On a crash (power loss, kill, BSOD) the library has saved state after each disk; on relaunch ISApexExLoadResume validates and restores progress, already-done disks are skipped. CRC32-checked, auto-deleted on success, fully opt-in (zero overhead unless ISApexExSetResumeFile is called).

▌ ENGINE FEATURES

◆ 7-Zip
Normal + split archives (.7z.001…), ZIP via the same engine, password-protected archives. The 7-Zip API requires split parts to be merged first, so ISApexEx builds a local temp file. Single directory → auto-detected; parts spread across folders → set the total with ISApexExSetSplitPartCount; override the temp location with ISApexExSetSplitTmpPath.

◆ FreeArc
Normal .arc/.bf, selective folder extraction (ISApexExAddDisksEx), external processor integration (SREP, XTool, LOLZ, NZ, RZ…), config file + work path (ISApexExExtractEx), password-protected archives, and native disk-span support via cls-diskspan v2.0 — when a volume is missing, the user is prompted to locate it and extraction resumes. Ship cls-diskspan.dll next to ISApexEx.dll; no ClsFunc* calls needed.

◆ RAR
Normal + multi-volume archives (.part01.rar…) with automatic volume switching (no extra API calls), password-protected archives.

◆ Xdelta3 Patching

Single-file patching — ISApexExAddPatch(PatchFile, SourceFile, OutputFile)
Batch directory patching — ISApexExAddPatchDir(PatchDir, SourceDir, OutputDir, Pattern)
In-place patching — when source = output, done via a temp file (decode to .xd3tmp, delete original, rename)
User-defined patch extensions — Pattern controls the scanned extension: *.xd3 (default), *.patch, *.delta, *.myext …
Recursive directory scanning — batch mode searches subdirectories
Deferred listing — patch/source dirs are scanned at extraction time, so you can patch files produced by an earlier archive in the same installer
Interleaved workflow — extract archives and apply patches in any order; progress stays continuous

▌ SUPPORTED FILE STRUCTURES

Code:

[ROOT]

 ├── data1.7z                  (normal 7z archive)

 ├── data2.zip                 (ZIP archive via 7z engine)

 ├── Disks/

 │    ├── Disk1/

 │    │    ├── Sonic 2.7z.001   (split 7z, parts across directories)

 │    │    └── Sonic 2.7z.002

 │    └── Disk2/

 │         ├── Sonic 2.7z.003

 │         └── Sonic 2.7z.004

 ├── data3.arc                 (FreeArc archive)

 ├── data4.bf                  (FreeArc archive)

 ├── data5.part01.rar          (multi-volume RAR)

 ├── data5.part02.rar

 ├── data5.part03.rar

 ├── data6.rar                 (normal RAR archive)

 ├── setup-1.bin               (cls-diskspan archive)

 ├── data7_xdelta.bin          (archive containing xdelta3 patches)

 └── Setup.exe

▌ SUPPORTED FILE EXTENSIONS

Code:

╭────────────────────────────┬──────────────────┬──────────────────╮

│ Extensions                 │ Engine           │ Constant         │

├────────────────────────────┼──────────────────┼──────────────────┤

│ .7z .7z.001 .7z.002 ...    │ 7z engine        │ APEX_ARC_7Z      │

│ .zip                       │ 7z engine        │ APEX_ARC_7Z      │

│ .arc .bf                   │ FreeArc engine   │ APEX_ARC_ARC     │

│ .rar .r00 .r01 ...         │ RAR engine       │ APEX_ARC_RAR     │

│ .xd3 .xdelta .vcdiff ...   │ xdelta3 engine   │ APEX_ARC_XDELTA  │

╰────────────────────────────┴──────────────────┴──────────────────╯

▌ EXPORTED API FUNCTIONS

Initialization — ISApexExInit, ISApexExInitEx
Disk Registration — ISApexExAddDisks, ISApexExAddDisksEx, ISApexExAddPatch, ISApexExAddPatchDir, ISApexExRegisterExtension, ISApexExClearExtensions
Extraction — ISApexExExtract, ISApexExExtractEx
Process Control — ISApexExSuspendProc, ISApexExResumeProc, ISApexExIsSuspended, ISApexExStop
Progress & Metrics — ISApexExGetTotalSizeMBOfAllDisks, ISApexExGetExtractedSizeMBOfAllDisks, ISApexExCallbackInterval, ISApexExGetCallbackInterval, ISApexExReduceCalcAccuracy
Configuration — ISApexExChangeLanguage, ISApexExSetSplitPartCount, ISApexExSetSplitTmpPath, ISApexExSetThreadPriority, ISApexExCheckFreeSpace, ISApexExCheckAllFreeSpace
Logging & Events — ISApexExSetLogFile, ISApexExSetLogLevel, ISApexExSetEventCallback
File Browsing — ISApexExSetDiskRequestCallback (global — covers every format + missing-part case)
Resume / Crash Recovery — ISApexExSetResumeFile, ISApexExLoadResume, ISApexExHasResume, ISApexExClearResume

▌ QUICK START EXAMPLES

Example 1 — Mixed Archives (7z + FreeArc + RAR)

Code:

#include "ISApexEx.iss"



procedure CurStepChanged(CurStep: TSetupStep);

begin

  if CurStep = ssInstall then

  begin

    if not AddArchiveEntry('data1.7z')  then Exit;

    if not AddArchiveEntry('data2.bf')  then Exit;

    if not AddArchiveEntry('data3.rar') then Exit;



    if ISApexExInitEx(2, @ProgressCallbackEx) then

    begin

      for i := 1 to ISApexExDiskCount do

        if not ISApexExExtract(i) then Break;

      ISApexExStop;

    end;

  end;

end;

Example 2 — Extract + xdelta3 Batch Patching

Code:

if not AddArchiveEntry('data1.7z') then Exit;        // base archive

if not AddArchiveEntry('data_xdelta.rar') then Exit;  // sources + patches



// apply all *.xd3 in \patches to sources in \modified -> \rebuilt

ISApexExAddPatchDir(

  ExpandConstant('{app}\patches'),

  ExpandConstant('{app}\modified'),

  ExpandConstant('{app}\rebuilt'),

  '*.xd3');

ISApexExDiskCount := ISApexExDiskCount + 1;

Example 3 — Single File xdelta3 Patch (In-Place)

Code:

if not AddArchiveEntry('data1.7z') then Exit;  // contains original game.exe



// patch game.exe in-place using game.exe.xd3

ISApexExAddPatch(

  ExpandConstant('{src}\game.exe.xd3'),

  ExpandConstant('{app}\game.exe'),

  ExpandConstant('{app}\game.exe'));

ISApexExDiskCount := ISApexExDiskCount + 1;

Example 4 — Split 7z Archive (Multi-Part .7z.001/.002/…)

Code:

if not AddArchiveEntry('Sonic 2.7z.001') then Exit;



// parts spread across folders: declare total count + a temp path

ISApexExSetSplitPartCount(ISApexExDiskCount, 7);

ISApexExSetSplitTmpPath(ISApexExDiskCount, ExpandConstant('{src}'));

Example 5 — Split RAR Archive (Multi-Volume .part01.rar/…)

Code:

if not AddArchiveEntry('data1.7z') then Exit;



// just pass the first part — UnRAR switches volumes automatically

if not AddArchiveEntry('data3.part01.rar') then Exit;

Example 6 — Progress Persistence / Resume (Crash Recovery)

Code:

ISApexExSetResumeFile(ExpandConstant('{src}\ISApexEx.resume'));



if ISApexExInitEx(2, @ProgressCallbackEx) then

begin

  if ISApexExLoadResume then   // prompts Yes/No to resume

    Log('Resuming from previous session');

  for i := 1 to ISApexExDiskCount do   // done disks are skipped

    if not ISApexExExtractEx(i, cfg, tmp) then Break;

  ISApexExStop;   // auto-deletes resume file on success

end;

Example 7 — Global "Locate Missing Archive / Volume / Part" Dialog
One callback handles EVERY case: a missing top-level archive of any format, a 7z split part, a RAR volume, or a FreeArc spanned volume. Runs on the main thread (MsgBox / GetOpenFileName / a custom TForm are all safe). Omit it to use the built-in native browse.

Code:

function MyDiskRequest(const Filename, CurrentDir: WideString): WideString;

begin

  if MsgBox('Please insert / locate: ' + Filename,

            mbConfirmation, MB_OKCANCEL) = mrCancel then

  begin

    Result := '';   // cancel -> clean user-abort

    Exit;

  end;

  // ... GetOpenFileName, or your own themed TForm ...

  Result := PickedFolder;   // the folder that now holds Filename

end;



// register once, after Init, before Extract:

ISApexExSetDiskRequestCallback(@MyDiskRequest);

▌ DISTRIBUTION FILES

ISApexEx.dll — Unified API library (single DLL for all four engines)
ISApexEx.iss — Header for Inno Setup (types, constants, imports)
7z_32.dll — 7-Zip engine (.7z/.zip)
UnArc_32.dll — FreeArc engine (.arc/.bf)
UnRAR_32.dll — UnRAR engine (.rar)
xdelta3_wrapper.dll — xdelta3 engine (patching)
cls-diskspan.dll — (Optional) FreeArc disk-spanning plugin, v2.0 modified edition. Only for setup-N.bin sets.
English.ini / Russian.ini — Language files
arc.ini / CLS.ini — FreeArc external-processor configuration

Engine DLLs are lazy-loaded — ship only the ones the archives you use actually need.

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Feedback, bug reports, and edge cases are all welcome.

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