Add build-with-entropy pipeline

.github/workflows/build.yml

@@ -59,6 +59,70 @@ jobs:
             -Werror=dev
           cmake --build build -- -k0
 
+  build-with-entropy:
+    name: 'MSVC 4.20 with entropy'
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        instance: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/checkout@v4
+      with:
+        repository: itsmattkc/msvc420
+        path: msvc420
+
+    - name: Setup cmake
+      uses: jwlawson/actions-setup-cmake@v2
+      with:
+        # Use minimum supported version
+        cmake-version: '3.15.x'
+
+    - name: Patch MSVC 4.2
+      run: |
+        tools/patch_c2.py msvc420/bin/C2.EXE
+
+    - name: Generate Entropy
+      shell: bash
+      run: |
+        # Get the first 8 characters of the SHA (enough for a decent seed)
+        SHA_PREFIX=$(echo "${{ github.sha }}" | cut -c 1-8)
+
+        tools/entropy.sh $((16#$SHA_PREFIX + ${{ matrix.instance }}))
+
+    - name: Build
+      shell: cmd
+      run: |
+        call .\msvc420\bin\VCVARS32.BAT x86
+        cmake -B build -DCMAKE_BUILD_TYPE=RelWithDebInfo -DISLE_INCLUDE_ENTROPY=ON -G "NMake Makefiles"
+        cmake --build build
+
+    - name: Upload Artifact
+      uses: actions/upload-artifact@main
+      with:
+        name: Win32-Entropy-${{ matrix.instance }}
+        path: |
+          build/CONFIG.EXE
+          build/CONFIG.PDB
+          build/ISLE.EXE
+          build/ISLE.PDB
+          build/LEGO1.DLL
+          build/LEGO1.PDB
+
+  merge-entropy-artifacts:
+    name: 'Merge entropy artifacts'
+    runs-on: ubuntu-latest
+    needs: build-with-entropy
+    steps:
+      - name: Merge Artifacts
+        uses: actions/upload-artifact/merge@v4
+        with:
+          name: Win32-Entropy
+          pattern: Win32-Entropy-*
+          separate-directories: true
+
   build:
     name: 'MSVC 4.20'
     runs-on: windows-latest
@@ -102,7 +166,7 @@ jobs:
 
   compare:
     name: Compare with master
-    needs: [build, fetch-deps]
+    needs: [build, merge-entropy-artifacts, fetch-deps]
     runs-on: windows-latest
     steps:
     - uses: actions/checkout@main
@@ -116,6 +180,11 @@ jobs:
        name: Win32
        path: build
 
+    - uses: actions/download-artifact@main
+      with:
+       name: Win32-Entropy
+       path: build-entropy
+
     - name: Restore cached original binaries
       id: cache-original-binaries
       uses: actions/cache/restore@v4

CMakeLists.txt

@@ -66,6 +66,7 @@ option(ISLE_DECOMP_ASSERT "Assert struct size" ${MSVC_FOR_DECOMP})
 cmake_dependent_option(ISLE_USE_DX5_LIBS "Build with internal DirectX 5 SDK Libraries" ON ISLE_USE_DX5 OFF)
 option(ISLE_BUILD_LEGO1 "Build LEGO1.DLL library" ON)
 option(ISLE_BUILD_BETA10 "Build BETA10.DLL library" OFF)
+option(ISLE_INCLUDE_ENTROPY "Build with entropy.h" OFF)
 
 if(NOT (ISLE_BUILD_LEGO1 OR ISLE_BUILD_BETA10))
   message(FATAL_ERROR "ISLE_BUILD_LEGO1 AND ISLE_BUILD_BETA10 cannot be both disabled")
@@ -585,6 +586,12 @@ if (MSVC_FOR_DECOMP)
     set_property(TARGET isle ${lego1_targets} PROPERTY MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
   endif()
 
+  if (ISLE_INCLUDE_ENTROPY)
+    foreach(tgt IN LISTS lego1_targets beta10_targets)
+      target_compile_options(${tgt} PRIVATE /FI${PROJECT_SOURCE_DIR}/entropy.h)
+    endforeach()
+  endif()
+
   if(TARGET lego1)
     target_link_options(lego1 PRIVATE "/OPT:REF")
     # Equivalent to target_compile_options(... PRIVATE "/MT$<$<CONFIG:Debug>:d>")

tools/entropy.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+# Output file
+OUTPUT_FILE="entropy.h"
+
+# Function to generate a CamelCase string of given length
+generate_name() {
+  local seed="$1"
+  local length="$2"
+  local char_count=0
+  local random_bytes=""
+
+  while [ "$char_count" -lt "$length" ]; do
+    random_bytes+=$(od -vAn -N4 -tu4 < /dev/urandom | tr -d '[:space:]')
+    char_count=$((char_count + 1))
+  done
+
+  # Use the provided seed for the random number generation.  Crucially, re-seed bash's
+  # RANDOM for each name.
+  RANDOM="$seed"
+
+  local result=""
+  for ((i=0; i<length; i++)); do
+    # Get a pseudo-random number between 0 and 25 (inclusive)
+    local rand_index=$((RANDOM % 26))
+    # Convert to lowercase ASCII character (a=97)
+    local char_code=$((97 + rand_index))
+    # Append to the result string
+    result+=$(printf "\\$(printf '%o' "$char_code")")
+  done
+  echo "$result" | sed -E 's/(^|_)([a-z])/\U\2/g'
+}
+
+# Parse command-line arguments
+if [ "$#" -ne 1 ]; then
+  echo "Usage: $0 <seed_number>"
+  exit 1
+fi
+
+SEED="$1"
+# Initialize the random number generator with the seed
+RANDOM="$SEED"
+
+# Generate a random number of classes (between 1 and 10)
+NUM_CLASSES=$((RANDOM % 10 + 1))
+
+> "$OUTPUT_FILE"  # Clear or create the output file
+
+echo "// Seed: $SEED" > "$OUTPUT_FILE"
+echo >> "$OUTPUT_FILE"
+
+for ((i=0; i<NUM_CLASSES; i++)); do
+    CLASS_NAME="Class$(generate_name "$((SEED + i * 100))" 6)"
+    echo "class $CLASS_NAME {" >> "$OUTPUT_FILE"
+
+    # Generate a random number of methods (between 1 and 10)
+    NUM_METHODS=$((RANDOM % 10 + 1))
+    for ((j=0; j<NUM_METHODS; j++)); do
+        METHOD_NAME="Function$(generate_name "$((SEED + i * 100 + j))" 8)"
+        echo -e "\tinline void $METHOD_NAME() {}" >> "$OUTPUT_FILE"
+    done
+
+    echo "};" >> "$OUTPUT_FILE"
+    echo >> "$OUTPUT_FILE"
+done
+
+echo "Generated $NUM_CLASSES classes in $OUTPUT_FILE using seed $SEED"