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Add algorithm-specific test cases
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‎test/README_ALGORITHM_TESTS.md‎

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# Algorithm-Specific Test Suites
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This directory contains individual test scripts for validating otezip's compression algorithm implementations against system binaries and reference implementations.
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## Test Scripts
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### test-deflate.sh
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Tests the DEFLATE compression algorithm implementation against gzip (system deflate reference).
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**Tests:**
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- `test_otezip_deflate_extraction()` - Round-trip compression/decompression with otezip
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- `test_otezip_deflate_system_unzip()` - Compatibility with system unzip
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- `test_compression_ratio()` - Compression ratio comparison with gzip
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- `test_corner_cases()` - Empty files, single bytes, etc.
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- `test_method_field()` - Verify ZIP method field (0x0008)
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**Run:** `bash test/test-deflate.sh`
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### test-zstd.sh
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Tests the ZSTD compression algorithm implementation against the system zstd binary.
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**Tests:**
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- `test_otezip_zstd_extraction()` - Round-trip compression/decompression
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- `test_compression_comparison()` - Ratio comparison with system zstd
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- `test_interop_decompress()` - Interoperability checks
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- `test_compression_levels()` - Compression level testing
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- `test_corner_cases()` - Empty, single byte, 5MB random file
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- `test_method_field()` - Verify ZIP method field (0x005D/93)
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**Run:** `bash test/test-zstd.sh`
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### test-lzma.sh
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Tests the LZMA compression algorithm implementation against xz (LZMA reference).
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**Tests:**
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- `test_otezip_lzma_extraction()` - Round-trip compression/decompression
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- `test_7z_lzma_extraction()` - Compatibility with 7z-created LZMA archives
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- `test_compression_comparison()` - Ratio comparison with system xz
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- `test_random_data()` - Incompressible data handling
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- `test_corner_cases()` - Empty, single byte, 1MB random file
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- `test_mixed_content()` - Multiple file types in one archive
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- `test_method_field()` - Verify ZIP method field (0x000E/14)
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**Run:** `bash test/test-lzma.sh`
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## Method IDs
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- STORE: 0
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- DEFLATE: 8
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- LZMA: 14
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- ZSTD: 93
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- Brotli: 97
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- LZFSE: 100
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## System Requirements
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- gzip (for DEFLATE comparison)
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- zstd (for ZSTD comparison)
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- xz (for LZMA/xz comparison)
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- 7z (optional, for LZMA 7z compatibility tests)
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- unzip (for standard ZIP extraction compatibility)
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Install on macOS:
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```
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brew install zstd xz
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# gzip comes with system
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```
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## Test Coverage
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These tests ensure that otezip's compression implementations:
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1. **Correctly compress and decompress files** - Round-trip integrity tests
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2. **Produce valid ZIP archives** - Compatible with system unzip
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3. **Match compression ratios** - Comparable to reference implementations
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4. **Handle edge cases** - Empty files, single bytes, various sizes
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5. **Maintain format compatibility** - Proper ZIP method field encoding
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6. **Interoperate with other tools** - Extract files created by 7z, etc.
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## Known Issues
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- Some large repetitive files (>100KB) with deflate have extraction issues
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- Very large LZMA files (>10MB) with 7z have compatibility issues
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- Compression ratio calculations in scripts may have minor parsing issues on macOS
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## Integration with Main Test Suite
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The main test suite (`test.sh`) tests all algorithms together. These individual scripts provide deeper, algorithm-specific validation and debugging capabilities.

‎test/test-deflate.sh‎

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#!/bin/sh
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# Test DEFLATE compression algorithm against system gzip implementation
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# This script compares otezip's deflate with gzip to ensure compatibility
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D=tmp_deflate
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MZ=$(pwd)/../otezip
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if [ ! -x "${MZ}" ]; then
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make -C .. >/dev/null 2>&1
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fi
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init() {
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rm -rf "$D" && mkdir -p "$D" && cd "$D"
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# Create test files
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printf "hello world\n" > test1.txt
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dd if=/dev/urandom of=test_binary.bin bs=1k count=10 2>/dev/null
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# Create a repetitive file (should compress well)
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python3 -c "print('A' * 5000)" > test_repetitive.txt 2>/dev/null || \
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perl -e 'print "A" x 5000' > test_repetitive.txt 2>/dev/null || \
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(i=0; while [ $i -lt 5000 ]; do printf "A"; i=$((i+1)); done) > test_repetitive.txt
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echo "[DEFLATE] Test files created:"
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ls -la
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}
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fini() {
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cd ..
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rm -rf "$D"
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}
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error() {
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echo "ERROR: $@" >&2
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exit 1
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}
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# Test 1: Create ZIP with otezip deflate, extract and verify with system
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test_otezip_deflate_extraction() {
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init
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echo "[TEST 1] otezip deflate creation + otezip extraction"
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$MZ -c archive.zip test1.txt test_binary.bin test_repetitive.txt -z deflate || \
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error "otezip creation failed"
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echo "[+] Created archive with otezip (deflate)"
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$MZ -l archive.zip
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mkdir -p extract_otezip
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cd extract_otezip
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$MZ -x ../archive.zip > /dev/null || error "otezip extraction failed"
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# Verify extracted files match originals
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cmp -s test1.txt ../test1.txt || error "test1.txt mismatch after otezip extract"
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cmp -s test_binary.bin ../test_binary.bin || error "test_binary.bin mismatch after otezip extract"
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cmp -s test_repetitive.txt ../test_repetitive.txt || error "test_repetitive.txt mismatch after otezip extract"
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echo "[+] All files extracted correctly by otezip"
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cd ..
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fini
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echo "[PASS] Test 1: otezip deflate round-trip"
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}
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# Test 2: Create ZIP with otezip deflate, verify with system unzip
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test_otezip_deflate_system_unzip() {
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init
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echo "[TEST 2] otezip deflate creation + system unzip extraction"
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$MZ -c archive.zip test1.txt test_binary.bin test_repetitive.txt -z deflate || \
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error "otezip creation failed"
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echo "[+] Created archive with otezip (deflate)"
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$MZ -l archive.zip
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mkdir -p extract_unzip
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cd extract_unzip
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unzip -q ../archive.zip || error "system unzip extraction failed"
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# Verify extracted files match originals
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cmp -s test1.txt ../test1.txt || error "test1.txt mismatch after system unzip"
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cmp -s test_binary.bin ../test_binary.bin || error "test_binary.bin mismatch after system unzip"
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cmp -s test_repetitive.txt ../test_repetitive.txt || error "test_repetitive.txt mismatch after system unzip"
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echo "[+] All files extracted correctly by system unzip"
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cd ..
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fini
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echo "[PASS] Test 2: otezip deflate compatible with system unzip"
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}
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# Test 3: Compare compression ratio with gzip
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test_compression_ratio() {
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init
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echo "[TEST 3] Compression ratio comparison with gzip"
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original_size=$(wc -c < test_repetitive.txt)
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echo "[*] Original repetitive file size: $original_size bytes"
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# otezip deflate compression
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$MZ -c archive_otezip.zip test_repetitive.txt -z deflate || \
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error "otezip creation failed"
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# Get the compressed size from the ZIP local header
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otezip_compressed=$(unzip -l archive_otezip.zip | grep test_repetitive | awk '{print $4}')
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otezip_zip_size=$(wc -c < archive_otezip.zip)
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echo "[*] otezip ZIP file size: $otezip_zip_size bytes (compressed: $otezip_compressed bytes)"
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# gzip compression for comparison
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gzip -k test_repetitive.txt
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gzip_size=$(wc -c < test_repetitive.txt.gz)
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echo "[*] gzip file size: $gzip_size bytes"
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# Calculate compression ratios
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echo "[*] Compression ratios:"
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echo " otezip deflate: $(echo "scale=2; $original_size / $otezip_compressed" | bc)x"
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echo " gzip deflate: $(echo "scale=2; $original_size / $gzip_size" | bc)x"
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fini
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echo "[PASS] Test 3: Compression ratio comparison"
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}
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# Test 4: Corner cases
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test_corner_cases() {
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init
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echo "[TEST 4] DEFLATE corner cases"
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# Empty file
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: > empty.txt
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$MZ -c archive.zip empty.txt -z deflate || error "failed on empty file"
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mkdir -p extract && cd extract
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$MZ -x ../archive.zip > /dev/null || error "extraction of empty failed"
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[ -f empty.txt ] || error "empty.txt not extracted"
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[ ! -s empty.txt ] || error "empty.txt should be empty"
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cd .. && rm -rf extract
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echo "[+] Empty file handling: OK"
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# Single byte
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printf "X" > single.bin
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$MZ -c archive.zip single.bin -z deflate || error "failed on single byte"
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mkdir -p extract && cd extract
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$MZ -x ../archive.zip > /dev/null || error "extraction of single byte failed"
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cmp -s single.bin ../single.bin || error "single byte mismatch"
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cd .. && rm -rf extract
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echo "[+] Single byte handling: OK"
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fini
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echo "[PASS] Test 4: DEFLATE corner cases"
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}
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# Test 5: Verify internal compression method field
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test_method_field() {
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init
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echo "[TEST 5] Verify DEFLATE method field in ZIP"
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$MZ -c archive.zip test1.txt -z deflate || error "otezip creation failed"
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# Method 8 is DEFLATE (0x08 in hex)
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# Check local file header compression method
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method=$(xxd -p archive.zip | head -c 200 | grep -o '0800' | head -1)
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if [ -n "$method" ]; then
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echo "[+] DEFLATE method field (0x0008) found in archive"
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else
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echo "[!] Warning: Could not verify DEFLATE method field, but archive works"
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fi
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fini
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echo "[PASS] Test 5: Method field verification"
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}
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# Run all tests
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echo "=================================================="
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echo "DEFLATE Compression Algorithm Test Suite"
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echo "Testing otezip against gzip/system unzip"
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echo "=================================================="
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test_otezip_deflate_extraction || exit 1
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test_otezip_deflate_system_unzip || exit 1
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test_compression_ratio
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test_corner_cases || exit 1
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test_method_field || exit 1
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echo ""
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echo "=================================================="
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echo "All DEFLATE tests passed!"
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echo "=================================================="

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