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Coding workflows · RIFF chunk boundary walking
03
A concrete starting point
Walk up to 128 chunks in a RIFF WAVE byte sequence of 12–1048576 bytes with an exact declared size. Test unknown chunks and odd-length padding, rejecting truncated headers or payloads without decoding audio.
Define the change
Describe the input, expected output and boundaries that must stay intact.
Inspect the work
Review the proposed edits and any commands before relying on their result.
Check the outcome
Compare actual behavior with the expected result. If a check fails, investigate it before applying more changes.
RIFF chunk boundary walking
A concrete starting point
def riff_chunks(wire):
if type(wire) is not bytes or not 12 <= len(wire) <= 1048576:
raise ValueError("riff.input")
if wire[:4] != b"RIFF" or wire[8:12] != b"WAVE" or int.from_bytes(wire[4:8], "little")+8 != len(wire):
raise ValueError("riff.header")
chunks, pos = [], 12
while pos < len(wire):
if len(chunks) == 128 or pos+8 > len(wire):
raise ValueError("riff.chunk")
tag = wire[pos:pos+4]
size = int.from_bytes(wire[pos+4:pos+8], "little")
start, stop = pos+8, pos+8+size
next_pos = stop+(size & 1)
if next_pos > len(wire):
raise ValueError("riff.truncated")
chunks.append((tag, wire[start:stop]))
pos = next_pos
return chunks
The example is a starting point for a real project, not a claim that generated code is already tested. Adjust paths, dependencies and expected behavior to match your application.