ci: add dual build artifacts to compare C vs Rust code paths (#2207)

* fix: flush pending EIT sections in EPG_free() before freeing buffers

* ci: add dual build artifacts to compare C vs Rust code paths

Add -min-rust flag to linux/build that passes -DDISABLE_RUST to gcc,
causing switchable modules (DTVCC, demuxer, AVC, networking, hex utils)
to use their C implementations instead of Rust. The Rust library still
compiles since many modules are Rust-only.

The Linux CI now produces two artifacts:
- "CCExtractor Linux build" — min Rust (C paths where available)
- "CCExtractor Linux build (with migrations)" — max Rust

Both should produce identical output on the sample platform. If they
diverge, it means a Rust port introduced a behavioral difference.

The sample platform will need a corresponding update to recognize and
test the new "with migrations" artifact.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Varadraj75 <agrawalvaradraj2007@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/build_linux.yml

@@ -33,7 +33,7 @@ jobs:
       run: sudo apt update && sudo apt-get install libgpac-dev libtesseract-dev libavcodec-dev libavdevice-dev libx11-dev libxcb1-dev libxcb-shm0-dev
     - uses: actions/checkout@v6
     - name: build
-      run: ./build -hardsubx
+      run: ./build -hardsubx -min-rust
       working-directory: ./linux
     - name: Display version information
       run: ./ccextractor --version
@@ -49,6 +49,29 @@ jobs:
       with:
         name: CCExtractor Linux build
         path: ./linux/artifacts
+  build_shell_migrations:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Install dependencies
+      run: sudo apt update && sudo apt-get install libgpac-dev libtesseract-dev libavcodec-dev libavdevice-dev libx11-dev libxcb1-dev libxcb-shm0-dev
+    - uses: actions/checkout@v6
+    - name: build
+      run: ./build -hardsubx
+      working-directory: ./linux
+    - name: Display version information
+      run: ./ccextractor --version
+      working-directory: ./linux
+    - name: Prepare artifacts
+      run: mkdir ./linux/artifacts
+    - name: Copy release artifact
+      run: cp ./linux/ccextractor ./linux/artifacts/
+    # NOTE: The sample-platform test runner (CCExtractor/sample-platform)
+    # matches artifact names exactly. Update Artifact_names in
+    # mod_ci/controllers.py there if you rename this artifact.
+    - uses: actions/upload-artifact@v7
+      with:
+        name: CCExtractor Linux build (with migrations)
+        path: ./linux/artifacts
   build_autoconf:
     runs-on: ubuntu-latest
     steps:

linux/build

@@ -24,6 +24,11 @@ while [[ $# -gt 0 ]]; do
       BLD_LINKER="$BLD_LINKER -lswscale -lavutil -pthread -lavformat -lavcodec -lavfilter -lxcb-shm -lxcb -lX11 -llzma -lswresample"
       shift
       ;;
+    -min-rust)
+      MIN_RUST=true
+      BLD_FLAGS="$BLD_FLAGS -DDISABLE_RUST"
+      shift
+      ;;
     -system-libs)
       USE_SYSTEM_LIBS=true
       shift

src/lib_ccx/ts_tables_epg.c

@@ -1630,6 +1630,24 @@ void EPG_free(struct lib_ccx_ctx *ctx)
 {
 	if (ctx->epg_inited)
 	{
+		// Flush any pending EIT sections not triggered by a subsequent
+		// payload_start_indicator packet (e.g. last section in stream)
+		for (int i = 0; i <= 0xfff; i++)
+		{
+			if (ctx->epg_buffers[i].buffer != NULL && ctx->epg_buffers[i].ccounter > 0)
+			{
+				if (ctx->epg_buffers[i].buffer_length > 0)
+				{
+					unsigned char pointer_field = (unsigned char)ctx->epg_buffers[i].buffer[0];
+					if ((size_t)pointer_field + 1 < (size_t)ctx->epg_buffers[i].buffer_length)
+					{
+						EPG_parse_table(ctx, ctx->epg_buffers[i].buffer, ctx->epg_buffers[i].buffer_length);
+					}
+				}
+				free(ctx->epg_buffers[i].buffer);
+				ctx->epg_buffers[i].buffer = NULL;
+			}
+		}
 		if (ccx_options.xmltv == 2 || ccx_options.xmltv == 3 || ccx_options.send_to_srv)
 		{
 			if (ccx_options.send_to_srv)