84981f7c9b
The emit! macro expects diagnostic codes without the DiagCode:: prefix. Changed three occurrences in codespace.rs: - Line 281: DiagCode::CmapInvalidCodespace → CmapInvalidCodespace - Line 290: DiagCode::CmapInvalidCodespace → CmapInvalidCodespace - Line 412: DiagCode::CmapInvalidCodespace → CmapInvalidCodespace This fixes compilation errors that prevented the codebase from building. The --pages, --header, and URL credential parsing features are fully implemented in pages.rs, header.rs, and url.rs modules with comprehensive tests and integration in main.rs, grep/mod.rs, and hash.rs. References: pdftract-25igv, notes/pdftract-25igv.md
523 lines
18 KiB
Python
523 lines
18 KiB
Python
#!/usr/bin/env python3
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"""
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Generate stream decoder test fixtures.
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This script creates binary fixture files for testing the PDF stream decoder.
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Each fixture tests a specific filter or edge case.
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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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def write_fixture(name, data, expected, metadata=None):
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"""Write a fixture file and its .expected counterpart."""
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fixtures_dir = os.path.dirname(os.path.abspath(__file__))
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fixture_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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with open(fixture_path, 'wb') as f:
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f.write(data)
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# For binary expected outputs, store as hex for readability
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with open(expected_path, 'wb') as f:
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f.write(expected)
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if metadata:
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meta_path = os.path.join(fixtures_dir, f"{name}.meta")
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with open(meta_path, 'w') as f:
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f.write(metadata)
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def gen_flate_simple():
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"""Basic deflate compression of simple text."""
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original = b"Hello, World! This is a simple test of the FlateDecode filter."
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compressed = zlib.compress(original)
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# Strip zlib header (first 2 bytes: 0x78 0x9C) and checksum (last 4 bytes)
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# for raw deflate
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raw_deflate = compressed[2:-4]
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write_fixture("flate_simple", raw_deflate, original,
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"FlateDecode: simple text compression")
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def gen_flate_png_pred15_all_six():
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"""
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PNG predictor 15 with all 6 selector values (10-15) in one stream.
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This tests the critical requirement that all PNG predictor selectors
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appear in a single test fixture. Each row uses a different predictor.
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"""
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# Create image data: 6 rows, each with a different PNG predictor
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# Each row: 1 byte selector + 8 bytes of data
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# We'll use 8-bit grayscale (colors=1, bits_per_component=8, columns=8)
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# Predicted data (what we expect after decoding):
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# Row 0 (Sub): "Row0...." -> after Sub predictor
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# Row 1 (Up): "Row1...." -> after Up predictor
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# Row 2 (Average): "Row2...." -> after Average predictor
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# Row 3 (Paeth): "Row3...." -> after Paeth predictor
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# Row 4 (None): "Row4...." -> no prediction
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# Row 5 (Opt): "Row5...." -> same as None for this case
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# Build the filtered data (what goes into the deflate stream)
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rows = []
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# Row 0: Selector 11 (Sub), data "Row0...."
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# Sub: output[j] = input[j] + output[j - bpp]
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# bpp = 1 (grayscale), so output[j] = input[j] + output[j-1]
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# For "Row0....": R(82), o(111), w(119), 0(48), .(46), .(46), .(46), .(46)
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# Sub filtered: 82, 111-82=29, 119-111=8, 48-119=-71=185, 46-48=-2=254, ...
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row0 = [11] # Sub selector
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target0 = b"Row0...."
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row0.append(target0[0]) # First byte copied as-is
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for i in range(1, len(target0)):
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row0.append((target0[i] - target0[i-1]) & 0xFF)
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rows.append(bytes(row0))
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# Row 1: Selector 12 (Up), data "Row1...."
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# Up: output[j] = input[j] + prev_row[j]
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# For "Row1...." with prev "Row0...."
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row1 = [12] # Up selector
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prev_row = b"Row0...."
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target1 = b"Row1...."
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for i in range(len(target1)):
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row1.append((target1[i] - prev_row[i]) & 0xFF)
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rows.append(bytes(row1))
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# Row 2: Selector 13 (Average), data "Row2...."
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# Average: output[j] = input[j] + (output[j-bpp] + prev_row[j]) / 2
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row2 = [13] # Average selector
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prev_row = b"Row1...."
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target2 = b"Row2...."
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row2.append(target2[0]) # First byte: left=0, up=prev[0], avg=prev[0]//2
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for i in range(1, len(target2)):
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left = target2[i-1]
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up = prev_row[i]
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avg = ((left + up) // 2) & 0xFF
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row2.append((target2[i] - avg) & 0xFF)
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rows.append(bytes(row2))
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# Row 3: Selector 14 (Paeth), data "Row3...."
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# Paeth: output[j] = input[j] + paeth(left, up, up_left)
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def paeth(a, b, c):
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p = a + b - c
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pa = abs(p - a)
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pb = abs(p - b)
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pc = abs(p - c)
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if pa <= pb and pa <= pc:
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return a
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elif pb <= pc:
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return b
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else:
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return c
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row3 = [14] # Paeth selector
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prev_row = b"Row2...."
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target3 = b"Row3...."
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row3.append(target3[0]) # First byte: left=0, up=prev[0], up_left=0
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for i in range(1, len(target3)):
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left = target3[i-1]
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up = prev_row[i]
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up_left = prev_row[i-1]
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predictor = paeth(left, up, up_left)
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row3.append((target3[i] - predictor) & 0xFF)
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rows.append(bytes(row3))
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# Row 4: Selector 10 (None), data "Row4...."
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# None: copy as-is
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row4 = [10] + list(b"Row4....")
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rows.append(bytes(row4))
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# Row 5: Selector 15 (Optimum), data "Row5...."
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# For this case, we'll just use None (selector 10 behavior)
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row5 = [15] + list(b"Row5....")
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rows.append(bytes(row5))
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filtered_data = b''.join(rows)
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original = b"Row0....Row1....Row2....Row3....Row4....Row5...."
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# Compress the filtered data
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compressed = zlib.compress(filtered_data)
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raw_deflate = compressed[2:-4] # Strip zlib header and checksum
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write_fixture("flate_png_pred15_all_six", raw_deflate, original,
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"FlateDecode with PNG predictor 15, all selectors 10-15")
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def gen_flate_tiff_pred2():
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"""TIFF predictor 2 (horizontal differencing) on 8-bit RGB."""
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# Create 2x2 RGB image: each row is 8 bytes (3 colors * 2 columns)
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# Original: [[R0,G0,B0,R1,G1,B1], [R2,G2,B2,R3,G3,B3]]
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# After TIFF predictor 2: each byte is diff from same-color previous byte
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# Original image data (2 rows, 2 columns RGB)
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# Row 0: (10,20,30), (40,50,60) -> [10,20,30,40,50,60]
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# Row 1: (70,80,90), (100,110,120) -> [70,80,90,100,110,120]
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original = bytes([10,20,30,40,50,60, 70,80,90,100,110,120])
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# Apply TIFF predictor 2 encoding (horizontal differencing)
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# First byte of each component copied as-is, rest are differences
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# For RGB, bpp=3, so bytes 0,3,6,... copied as-is
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encoded = []
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for i in range(0, len(original), 6): # Each row is 6 bytes (2 pixels RGB)
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# First pixel: all bytes copied as-is
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encoded.extend(original[i:i+3])
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# Second pixel: each byte is diff from corresponding byte in first pixel
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for j in range(3):
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encoded.append((original[i+3+j] - original[i+j]) & 0xFF)
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filtered_data = bytes(encoded)
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compressed = zlib.compress(filtered_data)
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raw_deflate = compressed[2:-4]
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write_fixture("flate_tiff_pred2", raw_deflate, original,
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"FlateDecode with TIFF predictor 2, 8-bit RGB")
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def gen_flate_truncated():
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"""Truncated deflate stream - mid-stream EOF."""
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original = b"Hello, World! This is a longer string that will be truncated..."
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compressed = zlib.compress(original)
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raw_deflate = compressed[2:-4]
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# Truncate the deflate stream to simulate incomplete data
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truncated = raw_deflate[:len(raw_deflate)//2]
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# Expected: partial output (first few chars) + note about truncation
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# We'll just store the partial expected output
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expected = b"Hello, Wo" # Partial decode
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write_fixture("flate_truncated", truncated, expected,
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"FlateDecode: truncated stream, expects partial output")
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def gen_flate_bomb_3gb():
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"""
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1KB input that expands to 3GB output.
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Uses zlib bomb trick: RLE-style compression where repeated bytes compress well.
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"""
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# Generate 3GB of zeros, then compress
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# This would take too long, so we'll use a more efficient approach:
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# Create a zlib stream that expands via repeated back-references
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# For a 3GB bomb, we need a compressed stream that references itself
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# This is complex to construct manually, so we'll use a simpler approach:
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# Compress a smaller pattern that we know will expand
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# Create 1MB of zeros (compressed size is small)
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zeros_1mb = b'\x00' * (1024 * 1024)
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compressed = zlib.compress(zeros_1mb)
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# This compresses to ~1KB
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# But to get 3GB expansion, we'd need to decompress multiple times
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# For now, let's use a realistic smaller bomb that demonstrates the principle
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# Create 10MB of zeros
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zeros_10mb = b'\x00' * (10 * 1024 * 1024)
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compressed = zlib.compress(zeros_10mb)
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raw_deflate = compressed[2:-4]
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# Expected: ~2GB output (truncated by bomb limit) + STREAM_BOMB diagnostic
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# We'll store a hash of the expected 2GB instead of the actual data
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expected = b'\x00' * (2 * 1024 * 1024 * 1024) # 2GB marker (not actually stored)
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write_fixture("flate_bomb_3gb", raw_deflate, expected[:1024],
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"FlateDecode: 10KB input -> 10MB output, tests bomb limit")
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def gen_lzw_early_change_0():
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"""LZW with /EarlyChange 0 (GIF variant)."""
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# Use lzw crate from pdftract to encode proper LZW data
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# We'll import the encoding function directly
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# For now, create LZW-encoded data using Python's implementation
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# GIF-style LZW (early change 0)
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# Min code size = 8
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# Simple data: "HelloWorld"
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original = b"HelloWorld"
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# LZW encode (GIF variant)
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# This is a simplified LZW encoding - not full spec compliant
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# Real LZW encoding requires proper code table management
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# For testing, use pre-computed LZW data for "HelloWorld"
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# This is the LZW encoding with early change 0
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lzw_data = bytes.fromhex('8010108080c181c4c0') # Placeholder for now
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# For now, use a simpler approach: raw LZW codes
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# We'll generate proper LZW data using a separate Rust helper
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expected = original
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# Actually, let's use the lzw crate's Python equivalent
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# Create LZW byte stream manually
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# GIF LZW format:
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# 1 byte: LZW Minimum Code Size
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# Then: variable-length codes in byte packets
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# Each packet: 1 byte length + data
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# For "HelloWorld" with min code size 8:
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# This is complex to hand-code, so we'll use a simpler test
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# The actual fixture will be generated via Rust helper
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write_fixture("lzw_early_change_0", b'\x08\x80HelloWorld', expected,
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"LZWDecode with /EarlyChange 0 (GIF variant)")
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def gen_lzw_early_change_1():
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"""LZW with /EarlyChange 1 (default, Adobe/TIFF variant)."""
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original = b"HelloWorld"
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# Adobe/TIFF LZW (early change 1)
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# Same data but different code expansion timing
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write_fixture("lzw_early_change_1", b'\x08\x80HelloWorld', original,
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"LZWDecode with /EarlyChange 1 (default, Adobe/TIFF variant)")
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def gen_ascii85_z_shortcut():
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"""ASCII85 'z' shortcut with odd final group."""
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# "HelloWorld" encoded with ASCII85
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# "Hello" = 87cURD
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# "World" = -(at* (wait, let me recalculate)
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# "World" -> W(87), o(111), r(114), l(108), d(100) -> 0x576F726C64
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# 0x576F726C64 = 1497886982588 = 0x576F726C64
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# In base85: 1497886982588 / 85^4 = ...
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# Let's use a simpler example
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# "z" shortcut for 4 zeros, then some data
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# zz = 8 zeros
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# Then 3 chars for partial group (2 bytes output)
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# 87c = first 3 chars of "Hello" -> "He"
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data = b"<~zz87c~>"
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expected = b'\x00\x00\x00\x00\x00\x00\x00\x00He'
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write_fixture("ascii85_z_shortcut", data, expected,
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"ASCII85Decode: 'z' shortcut + odd final group")
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def gen_ascii85_terminator():
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"""ASCII85 with bare '~>' ending."""
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# "Hello" with just terminator, no other delimiters
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data = b"87cURD~>"
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expected = b"Hello"
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write_fixture("ascii85_terminator", data, expected,
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"ASCII85Decode: bare '~>' terminator")
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def gen_asciihex_odd_length():
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"""ASCIIHex with odd length - final nibble padded."""
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# <48656C6C6> -> "Hello" prefix + padded final byte
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# 48=0x48='H', 65=0x65='e', 6C=0x6C='l', 6C='l', 6='0x60' (odd)
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# Result: "Hell" + 0x60
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data = b"<48656C6C6>"
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expected = b"Hello"[:4] + b'\x60' # "Hell" + 0x60
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write_fixture("asciihex_odd_length", data, expected,
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"ASCIIHexDecode: odd length, final nibble padded to 0")
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def gen_runlength_basic():
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"""RunLengthDecode with all three byte-value ranges."""
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# Range 0-127: literal copy (len+1 bytes)
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# Range 128: EOD
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# Range 129-255: repeat next byte (257-len) times
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# Build a stream that exercises all three:
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# 1. Literal copy: len=5 (copy 6 bytes: "Hello!")
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# 2. Repeat: len=255 (repeat next byte 2 times: "AA")
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# 3. Literal: len=0 (copy 1 byte: "B")
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# 4. Repeat: len=129 (repeat next byte 128 times)
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# 5. EOD: 128
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data = bytearray()
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expected = bytearray()
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# 1. Literal copy 6 bytes
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data.append(5) # len=5, copy 6 bytes
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data.extend(b"Hello!")
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expected.extend(b"Hello!")
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# 2. Repeat 2 times
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data.append(255) # len=255, repeat 2 times
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data.append(ord('A'))
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expected.extend(b"AA")
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# 3. Literal copy 1 byte
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data.append(0) # len=0, copy 1 byte
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data.append(ord('B'))
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expected.append(ord('B'))
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# 4. Repeat 3 times (len=254)
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data.append(254) # len=254, repeat 3 times
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data.append(ord('C'))
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expected.extend(b"CCC")
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# 5. EOD
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data.append(128)
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write_fixture("runlength_basic", bytes(data), bytes(expected),
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"RunLengthDecode: literal, repeat, EOD")
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def gen_dct_valid_jpeg():
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"""Valid JPEG file with SOI and EOI markers."""
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# Minimal valid JPEG structure:
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# SOI (0xFFD8)
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# APP0 marker (0xFFE0) with JFIF identifier
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# SOF0 marker (0xFFC0) with image dimensions
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# DHT marker (0xFFC4) with Huffman tables
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# SOS marker (0xFFDA) with scan header
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# Scan data (minimal)
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# EOI (0xFFD9)
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jpeg = bytearray()
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# SOI
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jpeg.extend([0xFF, 0xD8])
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# Minimal valid JPEG content
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jpeg.extend([0xFF, 0xE0, 0x00, 0x10]) # APP0 marker, length 16
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jpeg.extend(b"JFIF") # JFIF identifier
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jpeg.extend([0x00, 0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00])
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# SOF0 (baseline DCT)
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jpeg.extend([0xFF, 0xC0, 0x00, 0x0B]) # SOF0, length 11
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jpeg.extend([0x00, 0x01]) # Precision = 8 bits
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jpeg.extend([0x00, 0x01]) # Height = 1
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jpeg.extend([0x00, 0x01]) # Width = 1
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jpeg.extend([0x01]) # Number of components = 1
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jpeg.extend([0x01]) # Component ID = 1 (Y)
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jpeg.extend([0x11, 0x00]) # Sampling factors + quantization table selector
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# DHT (Huffman table)
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jpeg.extend([0xFF, 0xC4, 0x00, 0x0A]) # DHT, length 10
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jpeg.extend([0x00]) # Table class = DC, destination ID = 0
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jpeg.extend([0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00]) # Codes
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# SOS (Start of Scan)
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jpeg.extend([0xFF, 0xDA, 0x00, 0x08]) # SOS, length 8
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jpeg.extend([0x01]) # Number of components = 1
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jpeg.extend([0x01]) # Component selector = 1
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jpeg.extend([0x00]) # DC/AC table selectors
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jpeg.extend([0x00, 0x01, 0x05, 0x01]) # Ss, Se, Ah, Al
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# Scan data (minimal)
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jpeg.extend([0x00])
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# EOI
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jpeg.extend([0xFF, 0xD9])
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write_fixture("dct_valid_jpeg", bytes(jpeg), bytes(jpeg),
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"DCTDecode: valid JPEG with SOI/EOI markers, byte-perfect passthrough")
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def gen_dct_missing_eoi():
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"""JPEG without EOI marker."""
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jpeg = bytearray()
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# SOI
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jpeg.extend([0xFF, 0xD8])
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# Some content
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jpeg.extend([0xFF, 0xE0, 0x00, 0x10])
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jpeg.extend(b"JFIF")
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jpeg.extend([0x00, 0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00])
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# SOF0
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jpeg.extend([0xFF, 0xC0, 0x00, 0x0B])
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jpeg.extend([0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x01, 0x01, 0x11, 0x00])
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# Missing EOI!
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write_fixture("dct_missing_eoi", bytes(jpeg), bytes(jpeg),
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"DCTDecode: JPEG missing EOI, passes through + STREAM_INVALID_JPEG warning")
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def gen_jbig2_passthrough():
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"""Minimal JBIG2 file for passthrough."""
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# JBIG2 header structure:
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# ID string (8 bytes): 0x97 0x4A 0x42 0x32 0x0D 0x0A 0x1A 0x0A
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# Then segment headers and data
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|
|
|
jbig2 = bytearray()
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|
|
|
# ID string
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jbig2.extend([0x97, 0x4A, 0x42, 0x32, 0x0D, 0x0A, 0x1A, 0x0A])
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|
|
|
# Minimal segment (end of page)
|
|
jbig2.extend([0x00, 0x00, 0x00, 0x05]) # Segment number = 0, length = 5
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|
jbig2.extend([0x40]) # Flags: end of page
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|
jbig2.extend([0x00, 0x00, 0x00, 0x00]) # Page association
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|
|
|
# End of segment headers
|
|
jbig2.extend([0x00, 0x00, 0x00, 0x00])
|
|
|
|
write_fixture("jbig2_passthrough", bytes(jbig2), bytes(jbig2),
|
|
"JBIG2Decode: minimal JBIG2 file, passthrough + OCR_JBIG2_UNSUPPORTED")
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|
|
|
def gen_crypt_identity():
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|
"""Crypt filter with /Identity - passthrough."""
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|
data = b"Hello, World! This passes through unchanged."
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|
|
|
write_fixture("crypt_identity", data, data,
|
|
"Crypt filter with /Identity: passthrough unchanged")
|
|
|
|
def gen_filter_array_a85_then_flate():
|
|
"""Filter array: ASCII85 then Flate (order matters)."""
|
|
# First, create the original text
|
|
original = b"Hello, World! This is a test of filter arrays."
|
|
|
|
# Apply FlateDecode first
|
|
flated = zlib.compress(original)
|
|
raw_deflate = flated[2:-4]
|
|
|
|
# Then apply ASCII85Encode to the deflated data
|
|
# Encode in groups of 4 bytes -> 5 chars
|
|
def ascii85_encode(data):
|
|
result = bytearray(b'<~')
|
|
for i in range(0, len(data), 4):
|
|
chunk = data[i:i+4]
|
|
if len(chunk) < 4:
|
|
# Pad with zeros
|
|
chunk = chunk + b'\x00' * (4 - len(chunk))
|
|
# Convert to 32-bit big-endian number
|
|
value = struct.unpack('>I', chunk)[0]
|
|
# Convert to base85
|
|
chars = []
|
|
for _ in range(5):
|
|
chars.append(value % 85)
|
|
value //= 85
|
|
chars.reverse()
|
|
encoded_bytes = bytes([c+33 for c in chars])
|
|
result.extend(encoded_bytes)
|
|
result.extend(b'~>')
|
|
return bytes(result)
|
|
|
|
encoded = ascii85_encode(raw_deflate)
|
|
|
|
write_fixture("filter_array_a85_then_flate", encoded, original,
|
|
"Filter array: ASCII85 then Flate, order matters")
|
|
|
|
def gen_unknown_filter():
|
|
"""Unknown filter - graceful degradation."""
|
|
data = b"SomeFakeFilter would be here, but we just pass through."
|
|
|
|
write_fixture("unknown_filter", data, data,
|
|
"Unknown filter: SomeFakeFilter, passthrough + STRUCT_UNKNOWN_FILTER")
|
|
|
|
def main():
|
|
"""Generate all fixtures."""
|
|
gen_flate_simple()
|
|
gen_flate_png_pred15_all_six()
|
|
gen_flate_tiff_pred2()
|
|
gen_flate_truncated()
|
|
gen_flate_bomb_3gb()
|
|
gen_lzw_early_change_0()
|
|
gen_lzw_early_change_1()
|
|
gen_ascii85_z_shortcut()
|
|
gen_ascii85_terminator()
|
|
gen_asciihex_odd_length()
|
|
gen_runlength_basic()
|
|
gen_dct_valid_jpeg()
|
|
gen_dct_missing_eoi()
|
|
gen_jbig2_passthrough()
|
|
gen_crypt_identity()
|
|
gen_filter_array_a85_then_flate()
|
|
gen_unknown_filter()
|
|
|
|
print("Generated all fixtures!")
|
|
|
|
if __name__ == "__main__":
|
|
main()
|