Import VX multicall utility and applets

tests/test_gzip.sh

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+#!/bin/sh
+# tests/test_gzip.sh - Tests for gzip/gunzip/zcat applets
+_test_name="gzip"
+. "$(dirname "$0")/harness.sh"
+
+setup_tmpdir
+GZIP_CMD="$VX gzip"
+GUNZIP="$VX gunzip"
+ZCAT="$VX zcat"
+
+echo "Running gzip tests..."
+
+# --- basic compression/decompression ---
+printf 'Hello, World!\n' > hello.txt
+cp hello.txt hello.orig
+$GZIP_CMD hello.txt
+check_exit "basic: compress creates .gz" 0 test -f hello.txt.gz
+check_exit "basic: original removed" 1 test -f hello.txt
+
+$GUNZIP hello.txt.gz
+check_exit "basic: decompress creates original" 0 test -f hello.txt
+check_file hello.txt hello.orig "basic: roundtrip matches"
+
+# --- -k (keep) ---
+cp hello.orig keeptest.txt
+$GZIP_CMD -k keeptest.txt
+check_exit "keep: .gz created" 0 test -f keeptest.txt.gz
+check_exit "keep: original kept" 0 test -f keeptest.txt
+
+# --- -c (stdout) ---
+cp hello.orig stdout_test.txt
+$GZIP_CMD -c stdout_test.txt > stdout_test.gz
+check_exit "stdout: .gz created" 0 test -f stdout_test.gz
+check_exit "stdout: original kept" 0 test -f stdout_test.txt
+$GUNZIP -c stdout_test.gz > stdout_test_round.txt
+check_file stdout_test_round.txt hello.orig "stdout: roundtrip matches"
+
+# --- zcat ---
+_got="$($ZCAT stdout_test.gz)"
+_exp="$(cat hello.orig)"
+check_eq "$_got" "$_exp" "zcat: output matches original"
+
+# --- -d flag (decompress via gzip -d) ---
+cp stdout_test.gz dtest.gz
+$GZIP_CMD -d dtest.gz
+check_exit "dflag: decompresses" 0 test -f dtest
+check_file dtest hello.orig "dflag: output matches"
+
+# --- -f (force overwrite) ---
+cp hello.orig force_test.txt
+$GZIP_CMD force_test.txt
+cp hello.orig force_test.txt
+$GZIP_CMD -f force_test.txt
+check_exit "force: overwrites .gz" 0 test -f force_test.txt.gz
+
+# --- -t (test integrity) ---
+cp hello.orig ttest.txt
+$GZIP_CMD ttest.txt
+check_exit "test: valid gz passes" 0 $GZIP_CMD -t ttest.txt.gz
+
+# corrupt the gzip header magic bytes
+printf '\x00\x00' | dd of=ttest.txt.gz bs=1 seek=0 conv=notrunc 2>/dev/null
+check_exit "test: corrupt gz fails" 1 $GZIP_CMD -t ttest.txt.gz
+
+# --- -l (list) ---
+cp hello.orig ltest.txt
+$GZIP_CMD ltest.txt
+$GZIP_CMD -l ltest.txt.gz > list_out 2>&1
+_rc=$?
+check_eq "$_rc" "0" "list: exits 0"
+check_grep "compressed" list_out "list: prints header"
+
+# --- -n (no name) ---
+cp hello.orig ntest.txt
+$GZIP_CMD -n ntest.txt
+check_exit "nflag: compress succeeds" 0 test -f ntest.txt.gz
+
+# --- -1 through -9 (compression levels) ---
+for lvl in 1 9; do
+    cp hello.orig "level${lvl}.txt"
+    check_exit "level: -${lvl} compresses" 0 $GZIP_CMD "-${lvl}" "level${lvl}.txt"
+done
+
+# --- pipe mode (stdin/stdout) ---
+$GZIP_CMD < hello.orig > pipe_test.gz
+$GUNZIP < pipe_test.gz > pipe_test.txt
+check_file pipe_test.txt hello.orig "pipe: stdin roundtrip"
+
+# --- multiple files ---
+printf 'aaa\n' > multi_a.txt
+printf 'bbb\n' > multi_b.txt
+$GZIP_CMD multi_a.txt multi_b.txt
+check_exit "multi: a.gz exists" 0 test -f multi_a.txt.gz
+check_exit "multi: b.gz exists" 0 test -f multi_b.txt.gz
+
+# --- gunzip argv[0] dispatch ---
+cp hello.orig gun_test.txt
+$GZIP_CMD gun_test.txt
+$GUNZIP gun_test.txt.gz
+check_file gun_test.txt hello.orig "gunzip: dispatch works"
+
+# --- exit codes ---
+check_exit "exit: compress nonexistent fails" 1 $GZIP_CMD nonexistent_file_xyz
+
+summary