Jared Miller
11d939a70f
V8 uses the same format as V5 (object model, opcodes, stack) with two differences: packed address scaling (×8 instead of ×4) and max file size (512KB instead of 256KB). zmemory: add V8 size validation and packed_address case zobjectparser: accept version 8 alongside 4-5 in all checks zstackmanager: allow V8 stack initialization V6-7 remain unsupported (different packed address format with offsets).
64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
"""Tests for V8 z-machine version support."""
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import pytest
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from mudlib.zmachine.zmemory import ZMemory, ZMemoryUnsupportedVersion
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def make_minimal_story(version: int, size: int) -> bytes:
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"""Create a minimal z-machine story file of the specified version and size."""
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story = bytearray(size)
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story[0] = version # version byte
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# Set static memory base (0x0E) to a reasonable value
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story[0x0E] = 0x04
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story[0x0F] = 0x00
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# Set high memory base (0x04) to end of file
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story[0x04] = (size >> 8) & 0xFF
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story[0x05] = size & 0xFF
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# Set global variables base (0x0C)
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story[0x0C] = 0x03
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story[0x0D] = 0x00
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return bytes(story)
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def test_v3_accepts_128kb_story():
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"""V3 stories can be up to 128KB (131072 bytes)."""
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story = make_minimal_story(3, 131072)
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mem = ZMemory(story)
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assert mem.version == 3
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def test_v5_accepts_256kb_story():
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"""V5 stories can be up to 256KB (262144 bytes)."""
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story = make_minimal_story(5, 262144)
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mem = ZMemory(story)
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assert mem.version == 5
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def test_v8_accepts_512kb_story():
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"""V8 stories can be up to 512KB (524288 bytes)."""
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story = make_minimal_story(8, 524288)
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mem = ZMemory(story)
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assert mem.version == 8
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def test_v8_packed_address_scaling():
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"""V8 uses ×8 scaling for packed addresses (not ×4 like V5)."""
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story = make_minimal_story(8, 10000)
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mem = ZMemory(story)
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# V8 packed address 100 should map to byte address 800
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assert mem.packed_address(100) == 800
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def test_v6_unsupported():
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"""V6 should still be unsupported (different packed address format)."""
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story = make_minimal_story(6, 10000)
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with pytest.raises(ZMemoryUnsupportedVersion):
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ZMemory(story)
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def test_v7_unsupported():
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"""V7 should still be unsupported (different packed address format)."""
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story = make_minimal_story(7, 10000)
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with pytest.raises(ZMemoryUnsupportedVersion):
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ZMemory(story)
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