source /usr/local/bin/enginescript/enginescript-variables.txt || { echo "Error: Failed to source /usr/local/bin/enginescript/enginescript-variables.txt" >&2; exit 1; }

source /home/EngineScript/enginescript-install-options.txt || { echo "Error: Failed to source /home/EngineScript/enginescript-install-options.txt" >&2; exit 1; }

source /usr/local/bin/enginescript/scripts/functions/shared/enginescript-common.sh || { echo "Error: Failed to source /usr/local/bin/enginescript/scripts/functions/shared/enginescript-common.sh" >&2; exit 1; }

cd /usr/src

clean_directory "/usr/src/zlib-${ZLIB_VER}"

if [[ -f "/usr/src/zlib-${ZLIB_VER}.tar.gz" ]]; then

rm -f "/usr/src/zlib-${ZLIB_VER}.tar.gz"

download_and_extract "https://github.com/madler/zlib/archive/refs/tags/v${ZLIB_VER}.tar.gz" "/usr/src/zlib-${ZLIB_VER}.tar.gz"

if [[ "${ZLIB_IMPLEMENTATION}" == "zlib-ng" ]]; then

echo "============================================================="

echo " Preparing zlib-ng ${ZLIB_NG_VER} (experimental)"

echo "============================================================="

cd /usr/src

clean_directory "/usr/src/zlib-ng-${ZLIB_NG_VER}"

if [[ -f "/usr/src/zlib-ng-${ZLIB_NG_VER}.tar.gz" ]]; then

rm -f "/usr/src/zlib-ng-${ZLIB_NG_VER}.tar.gz"

fi

download_and_extract "https://github.com/zlib-ng/zlib-ng/archive/refs/tags/${ZLIB_NG_VER}.tar.gz" "/usr/src/zlib-ng-${ZLIB_NG_VER}.tar.gz"

# Create a configure wrapper

#

# Nginx's build system calls ./configure with NO arguments in the zlib

# source dir. zlib-ng REQUIRES --zlib-compat to produce a standard

# zlib-compatible API (libz.a with standard symbol names).

# Without it, zlib-ng produces libz-ng.a with zng_ prefixed symbols.

#

# Solution: rename the real configure and create a wrapper that always

# passes --zlib-compat.

cd "/usr/src/zlib-ng-${ZLIB_NG_VER}"

mv configure configure.zlib-ng

cat > configure << 'WRAPPER'

chmod +x configure

# Stub Makefile so nginx's "make distclean" succeeds before configure runs.

# Overwritten when ./configure generates the real Makefile.

cat > Makefile << 'STUBMAKE'

echo "zlib-ng ${ZLIB_NG_VER} prepared for Nginx compilation"

if [[ "${ZLIB_IMPLEMENTATION}" == "zlib-rs" ]]; then

echo "============================================================="

echo " Preparing zlib-rs ${ZLIB_RS_VER} (experimental)"

echo "============================================================="

ZLIB_RS_PREFIX="/opt/zlib-rs"

# Install Rust toolchain if not present

if ! command -v cargo >/dev/null 2>&1; then

echo "Installing Rust toolchain (required for zlib-rs)..."

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y

source "$HOME/.cargo/env"

fi

echo "Rust version: $(rustc --version)"

echo "Cargo version: $(cargo --version)"

cd /usr/src

clean_directory "/usr/src/zlib-rs"

git clone --branch "${ZLIB_RS_VER}" --depth 1 https://github.com/trifectatechfoundation/zlib-rs.git /usr/src/zlib-rs

cd /usr/src/zlib-rs/libz-rs-sys-cdylib

# Build with native CPU optimizations for best performance

RUSTFLAGS="-Ctarget-cpu=native -Cllvm-args=-enable-dfa-jump-thread" \

cargo build --release --features c-allocator

echo "zlib-rs library built successfully"

# Install to a local prefix mimicking a standard zlib install

rm -rf "${ZLIB_RS_PREFIX}"

mkdir -p "${ZLIB_RS_PREFIX}/lib" "${ZLIB_RS_PREFIX}/include"

cp /usr/src/zlib-rs/target/release/libz_rs.a "${ZLIB_RS_PREFIX}/lib/libz.a"

cp /usr/src/zlib-rs/libz-rs-sys-cdylib/include/zlib.h "${ZLIB_RS_PREFIX}/include/"

cp /usr/src/zlib-rs/libz-rs-sys-cdylib/include/zconf.h "${ZLIB_RS_PREFIX}/include/"

echo "zlib-rs ${ZLIB_RS_VER} installed to ${ZLIB_RS_PREFIX}"

cd /usr/src