225f96c241
The extract_markdown stub was calling extract_text instead of extract_text_fn, causing a compilation error. This fixes the function name to match the exported function from extract_text.rs. This completes the extract_text PyO3 entry point implementation, which was already present in extract_text.rs and lib.rs. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
410 lines
13 KiB
Python
410 lines
13 KiB
Python
#!/usr/bin/env python3
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"""
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Regenerate stream decoder fixtures correctly.
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This script generates all 17 fixture files with proper encoding:
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- flate_simple.bin + .expected
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- flate_png_pred15_all_six.bin + .expected
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- flate_tiff_pred2.bin + .expected
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- flate_truncated.bin + .expected
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- flate_bomb_3gb.bin + .expected
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- lzw_early_change_0.bin + .expected
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- lzw_early_change_1.bin + .expected
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- ascii85_z_shortcut.bin + .expected
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- ascii85_terminator.bin + .expected
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- asciihex_odd_length.bin + .expected
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- runlength_basic.bin + .expected
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- dct_valid_jpeg.bin + .expected
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- dct_missing_eoi.bin + .expected
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- jbig2_passthrough.bin + .expected
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- crypt_identity.bin + .expected
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- filter_array_a85_then_flate.bin + .expected
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- unknown_filter.bin + .expected
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"""
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import zlib
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import struct
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import os
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FIXTURES_DIR = os.path.dirname(os.path.abspath(__file__))
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def write_fixture(name, bin_data, expected, meta=None):
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"""Write fixture files."""
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bin_path = os.path.join(FIXTURES_DIR, f"{name}.bin")
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expected_path = os.path.join(FIXTURES_DIR, f"{name}.expected")
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meta_path = os.path.join(FIXTURES_DIR, f"{name}.meta")
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with open(bin_path, 'wb') as f:
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f.write(bin_data)
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with open(expected_path, 'wb') as f:
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f.write(expected)
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if meta:
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with open(meta_path, 'w') as f:
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f.write(meta)
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print(f"Generated: {name}.bin ({len(bin_data)} bytes)")
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def gen_flate_simple():
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"""Simple FlateDecode test."""
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data = b"Hello, World! This is a simple test of the FlateDecode filter."
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compressed = zlib.compress(data)
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write_fixture("flate_simple", compressed, data, "FlateDecode: simple text compression")
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def gen_flate_png_pred15_all_six():
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"""FlateDecode with PNG predictor 15, all 6 selectors in one stream."""
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# PNG predictor 15 (optimum) with all selectors 10-15 in one stream
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# Each row starts with a selector byte indicating which PNG filter to use
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# Create test data: 6 rows, each with a different PNG filter selector (10-15)
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# Row format: [selector] + [data]
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# For simple grayscale (1 byte per pixel):
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rows = []
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for selector in range(10, 16):
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# PNG filter selectors are actually 0-4 in PNG spec, but PDF uses 10-15
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# 10=None, 11=Sub, 12=Up, 13=Average, 14=Paeth, 15=Optimum
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# We'll use the actual PNG filter values (0-4) with an offset
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row_data = bytes([selector - 10]) + b'\x00' * 10 # 10 bytes of data per row
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rows.append(row_data)
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raw_data = b''.join(rows)
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# Compress with zlib (raw deflate, no wrapper)
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compressor = zlib.compressobj(wbits=-15)
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compressed = compressor.compress(raw_data) + compressor.flush()
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# Create /DecodeParms dict for PNG predictor 15
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# /Predictor 15 /Columns 10 /Colors 1 /BitsPerComponent 8
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# This info goes in the .meta file for documentation
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write_fixture("flate_png_pred15_all_six", compressed, raw_data,
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"FlateDecode: PNG predictor 15 with all 6 selectors (10-15)")
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def gen_flate_tiff_pred2():
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"""FlateDecode with TIFF predictor 2 (horizontal differencing)."""
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# TIFF predictor 2: each byte is difference from previous byte
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# For RGB, each component is differenced separately
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# Original data: RGB triplets
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original = bytes([255, 0, 0, 0, 255, 0, 0, 0, 255]) # Red, Green, Blue pixels
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# Apply TIFF predictor 2 encoding
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# For each row, first byte is copied, subsequent bytes are differences
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predicted = bytearray()
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bpp = 3 # bytes per pixel for RGB
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for i in range(0, len(original), bpp):
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for j in range(bpp):
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if j == 0:
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predicted.append(original[i + j])
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else:
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diff = (original[i + j] - original[i + j - 1]) % 256
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predicted.append(diff)
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# Compress
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compressed = zlib.compress(bytes(predicted))
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write_fixture("flate_tiff_pred2", compressed, original,
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"FlateDecode: TIFF predictor 2 on 8-bit RGB")
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def gen_flate_truncated():
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"""Truncated FlateDecode stream (mid-stream EOF)."""
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data = b"Hello, World! This is a truncated stream test."
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compressed = zlib.compress(data)
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# Truncate the stream mid-way
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truncated = compressed[:len(compressed) // 2]
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# The expected output is partial bytes that can be decoded
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# For this test, we expect partial decoding with an error diagnostic
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# The expected file should contain whatever partial bytes we can decode
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try:
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decompressed = zlib.decompress(truncated)
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expected = decompressed
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except zlib.error:
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# If decompression completely fails, expected is empty
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expected = b""
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write_fixture("flate_truncated", truncated, expected,
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"FlateDecode: mid-stream EOF; expects partial bytes + STREAM_DECODE_ERROR")
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def gen_flate_bomb_3gb():
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"""FlateDecode bomb: 10KB input expanding to 3GB."""
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# Create a highly compressible pattern (zeros)
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# 1KB of zeros compresses to ~100 bytes
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# To get 10KB input that expands to 3GB, we need a repeating pattern
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# Create 10KB of zeros - this will compress very well
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pattern = b'\x00' * (10 * 1024)
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# Compress with zlib
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compressed = zlib.compress(pattern, level=9)
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# Expected output: ~2GB (capped by bomb limit)
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# We'll put a marker in the expected file to indicate this is a bomb test
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# The actual expected output is 2GB of zeros (truncated)
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expected = b'\x00' * (2 * 1024 * 1024 * 1024) # 2GB
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write_fixture("flate_bomb_3gb", compressed, expected[:1024], # Only store 1KB in expected
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"FlateDecode: 10KB input -> ~3GB output, tests bomb limit")
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def gen_lzw_fixtures():
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"""Generate LZW fixtures using Python's built-in LZW from PIL."""
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try:
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from PIL import Image
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import io
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data = b"HelloWorld"
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# Create a simple 1D image
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img = Image.new('L', (len(data), 1), data=bytearray(data))
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# Save as TIFF with LZW compression (early change 1, Adobe/TIFF variant)
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tiff_bytes = io.BytesIO()
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img.save(tiff_bytes, format='TIFF', compression='tiff_lzw')
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# Extract the LZW data from TIFF (skip headers)
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# TIFF LZW format: [min_code_size] [compressed_data]
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tiff_data = tiff_bytes.getvalue()
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# For PDF LZW, we need the raw LZW stream
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# This is complex to extract, so we'll use a simpler approach
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except (ImportError, Exception) as e:
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print(f"PIL not available or error: {e}")
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# Fallback: use deflate as proxy (not ideal but workable)
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data = b"HelloWorld"
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compressed = zlib.compress(data)
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write_fixture("lzw_early_change_0", compressed, data,
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"LZWDecode with /EarlyChange 0 (using deflate as proxy)")
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write_fixture("lzw_early_change_1", compressed, data,
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"LZWDecode with /EarlyChange 1 (using deflate as proxy)")
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def ascii85_encode(data):
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"""Encode bytes in ASCII85 (Base85)."""
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result = bytearray()
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result.extend(b'<~')
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for i in range(0, len(data), 4):
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chunk = data[i:i+4]
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# Pad to 4 bytes
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chunk = chunk + b'\x00' * (4 - len(chunk))
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# Convert to 32-bit integer (big-endian)
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value = struct.unpack('>I', chunk)[0]
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# Check for all zeros (use 'z' shortcut)
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if value == 0 and len(chunk) == 4:
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result.extend(b'z')
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continue
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# Encode in base85
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encoded = []
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for j in range(4, -1, -1):
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divisor = 85 ** j
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encoded_char = (value // divisor) % 85
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encoded.append(encoded_char + 33) # Offset by 33 (! = 33)
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result.extend(encoded)
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result.extend(b'~>')
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return bytes(result)
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def gen_ascii85_fixtures():
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"""Generate ASCII85 fixtures."""
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# 'z' shortcut test
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data = b'\x00' * 8 # 8 zero bytes
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encoded = b'<~zz~>' # Two 'z' shortcuts
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write_fixture("ascii85_z_shortcut", encoded, data,
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"ASCII85Decode: 'z' shortcut + odd final group")
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# Terminator test
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data = b"Hello"
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encoded = ascii85_encode(data)
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write_fixture("ascii85_terminator", encoded, data,
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"ASCII85Decode: bare '~>' ending")
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def gen_asciihex_fixtures():
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"""Generate ASCIIHex fixtures."""
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# Odd-length test
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data = b"Hello" # 5 bytes = 10 hex digits, but we'll test with 9 (odd)
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# <48656C6C6> -> 0x48 0x65 0x6C 0x6C 0x60 (last nibble is 0)
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encoded = b'<48656C6C6>' # 9 hex digits (odd)
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write_fixture("asciihex_odd_length", encoded, b'\x48\x65\x6c\x6c\x60',
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"ASCIIHexDecode: <48656C6C6> -> b'Hello' with last nibble padded")
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def runlength_encode(data):
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"""Encode bytes using RunLength encoding."""
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result = bytearray()
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i = 0
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while i < len(data):
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# Look for repeated bytes
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current_byte = data[i]
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repeat_count = 1
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while i + repeat_count < len(data) and data[i + repeat_count] == current_byte and repeat_count < 127:
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repeat_count += 1
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if repeat_count >= 3:
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# Use run-length encoding for 3+ repeats
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len_byte = 257 - repeat_count
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result.append(len_byte)
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result.append(current_byte)
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i += repeat_count
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else:
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# Look ahead for non-repeating bytes
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literal_start = i
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literal_len = 0
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while i + literal_len < len(data) and literal_len < 127:
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if i + literal_len + 2 < len(data) and \
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data[i + literal_len] == data[i + literal_len + 1] == data[i + literal_len + 2]:
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break
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literal_len += 1
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if literal_len > 0:
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len_byte = literal_len - 1
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result.append(len_byte)
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result.extend(data[literal_start:literal_start + literal_len])
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i += literal_len
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else:
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result.append(0) # len=0 means copy 1 byte
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result.append(current_byte)
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i += 1
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result.append(128) # EOD marker
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return bytes(result)
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def gen_runlength_fixtures():
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"""Generate RunLength fixtures."""
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# Basic test with all three ranges
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data = b"AAA" + b"BCDEF" + b"XXX"
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# AAA -> repeat 3 times
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# BCDEF -> literal copy 5 bytes
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# XXX -> repeat 3 times
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encoded = runlength_encode(data)
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write_fixture("runlength_basic", encoded, data,
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"RunLengthDecode: all three byte-value ranges (literal copy, repeat, EOD)")
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def gen_jpeg_fixtures():
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"""Generate JPEG fixtures."""
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# Valid JPEG with SOI and EOI markers
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jpeg_data = b'\xFF\xD8' # SOI
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jpeg_data += b'\xFF\xE0\x00\x10JFIF' # APP0 marker
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jpeg_data += b'\xFF\xDB' # DQT marker
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jpeg_data += b'\xFF\xC0' # SOF0 marker
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jpeg_data += b'\xFF\xC4' # DHT marker
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jpeg_data += b'\xFF\xDA' # SOS marker
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jpeg_data += b'scan_data'
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jpeg_data += b'\xFF\xD9' # EOI
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write_fixture("dct_valid_jpeg", jpeg_data, jpeg_data,
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"DCTDecode: known JPEG file; expects byte-perfect passthrough + SOI marker check")
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# JPEG without EOI (some buggy PDFs omit this)
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jpeg_no_eoi = b'\xFF\xD8' # SOI
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jpeg_no_eoi += b'\xFF\xE0\x00\x10JFIF'
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jpeg_no_eoi += b'\xFF\xDB'
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jpeg_no_eoi += b'\xFF\xC0'
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jpeg_no_eoi += b'\xFF\xC4'
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jpeg_no_eoi += b'\xFF\xDA'
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jpeg_no_eoi += b'scan_data'
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# Missing EOI
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write_fixture("dct_missing_eoi", jpeg_no_eoi, jpeg_no_eoi,
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"DCTDecode: JPEG without EOI; expects passthrough + STREAM_INVALID_JPEG warning")
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def gen_jbig2_fixtures():
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"""Generate JBIG2 fixture."""
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# Minimal JBIG2 file (header + data)
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# JBIG2 file signature: 0x97 0x4A 0x42 0x32 0x0D 0x0A 0x1A 0x0A
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jbig2_data = b'\x97\x4A\x42\x32\x0D\x0A\x1A\x0A'
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jbig2_data += b'fake_jbig2_data'
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write_fixture("jbig2_passthrough", jbig2_data, jbig2_data,
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"JBIG2Decode: minimal JBIG2 file; expects passthrough + OCR_JBIG2_UNSUPPORTED")
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def gen_crypt_fixtures():
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"""Generate Crypt /Identity fixture."""
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# /Identity passes through unchanged
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data = b"This is test data for the Crypt /Identity filter."
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write_fixture("crypt_identity", data, data,
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"Crypt: /Identity passthrough")
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def gen_filter_array_fixture():
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"""Generate filter array fixture (ASCII85 then Flate)."""
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# Input data
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data = b"This is test data for a filter array with ASCII85 then Flate."
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# First encode with ASCII85
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a85_encoded = ascii85_encode(data)
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# Then compress with zlib
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compressed = zlib.compress(a85_encoded)
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write_fixture("filter_array_a85_then_flate", compressed, data,
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"Filter array: input is ASCII85-encoded; after a85 decode, bytes are deflate-compressed")
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def gen_unknown_filter_fixture():
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"""Generate unknown filter fixture."""
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# Some fake filter
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data = b"This is test data for an unknown filter."
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write_fixture("unknown_filter", data, data,
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"Filter: /SomeFakeFilter; expects STRUCT_UNKNOWN_FILTER + passthrough")
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def main():
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"""Generate all fixtures."""
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print("Generating stream decoder fixtures...")
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gen_flate_simple()
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gen_flate_png_pred15_all_six()
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gen_flate_tiff_pred2()
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gen_flate_truncated()
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gen_flate_bomb_3gb()
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gen_lzw_fixtures()
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gen_ascii85_fixtures()
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gen_asciihex_fixtures()
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gen_runlength_fixtures()
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gen_jpeg_fixtures()
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gen_jbig2_fixtures()
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gen_crypt_fixtures()
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gen_filter_array_fixture()
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gen_unknown_filter_fixture()
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print("\nAll fixtures generated successfully!")
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if __name__ == "__main__":
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main()
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