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Code Issues Releases Activity

Chunk fixes

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This commit is contained in:
Romein van Buren
2025-06-13 17:23:58 +02:00
parent ba62b66f63
commit 17a3664e42
1 changed files with 60 additions and 61 deletions
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121
fmp/fmp_chunk.go
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@ -6,178 +6,177 @@ func (ctx *FmpFile) readChunk(payload []byte) (*FmpChunk, error) {
// https://github.com/Rasmus20B/fmplib/blob/66245e5269275724bacfe1437fb1f73bc587a2f3/src/fmp_format/chunk.rs#L57-L60
chunk := &FmpChunk{}
chunkCode := payload[0]
if (payload[0] & 0xC0) == 0xC0 {
payload[0] &= 0x3F
if (chunkCode & 0xC0) == 0xC0 {
chunkCode &= 0x3F
chunk.Delayed = true
}
switch payload[0] {
switch chunkCode {
case 0x00:
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1 : 1+1]
chunk.Length = 2
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1:chunk.Length]
case 0x01:
chunk.Length = 3
chunk.Type = FMP_CHUNK_SIMPLE_KEY_VALUE
chunk.Key = uint64(payload[1])
chunk.Value = payload[2 : 2+1]
chunk.Length = 3
chunk.Value = payload[2:chunk.Length]
case 0x02, 0x03, 0x04, 0x05:
valueLength := uint64(2 * (payload[0] - 1))
valueLength := uint64(2 * (chunkCode - 1))
chunk.Length = 2 + valueLength
chunk.Type = FMP_CHUNK_SIMPLE_KEY_VALUE
chunk.Key = uint64(payload[1])
chunk.Value = payload[2 : 2+valueLength]
chunk.Length = 2 + uint64(valueLength)
chunk.Value = payload[2:chunk.Length]
case 0x06:
valueLength := uint64(payload[2])
chunk.Length = 3 + valueLength
chunk.Type = FMP_CHUNK_SIMPLE_KEY_VALUE
chunk.Key = uint64(payload[1])
chunk.Value = payload[3 : 3+valueLength]
chunk.Length = 3 + uint64(valueLength)
chunk.Value = payload[3:chunk.Length]
case 0x07:
valueLength := parseVarUint64(payload[2 : 2+2])
payloadLimit := min(4+valueLength, uint64(len(payload)))
chunk.Length = min(4+valueLength, uint64(len(payload)))
chunk.Type = FMP_CHUNK_SEGMENTED_DATA
chunk.Index = uint64(payload[1])
chunk.Value = payload[4:payloadLimit]
chunk.Length = 4 + uint64(valueLength)
chunk.Value = payload[4:chunk.Length]
case 0x08:
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1 : 1+2]
chunk.Length = 3
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1:chunk.Length]
case 0x09:
chunk.Length = 4
chunk.Type = FMP_CHUNK_SIMPLE_KEY_VALUE
chunk.Key = parseVarUint64(payload[1 : 1+2])
chunk.Value = payload[3 : 3+1]
chunk.Length = 4
chunk.Value = payload[3:chunk.Length]
case 0x0A, 0x0B, 0x0C, 0x0D:
valueLength := uint64(2 * (payload[0] - 0x09))
valueLength := uint64(2 * (chunkCode - 0x09))
chunk.Length = 3 + valueLength
chunk.Type = FMP_CHUNK_SIMPLE_KEY_VALUE
chunk.Key = parseVarUint64(payload[1 : 1+2])
chunk.Value = payload[3 : 3+valueLength]
chunk.Length = 3 + uint64(valueLength)
chunk.Value = payload[3:chunk.Length]
case 0x0E:
if payload[1] == 0xFE {
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1 : 1+8]
chunk.Length = 10
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[2:chunk.Length]
break
}
if payload[1] == 0xFF {
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[2 : 2+5]
chunk.Length = 7
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[2:chunk.Length]
break
}
valueLength := uint64(payload[2])
chunk.Length = 4 + valueLength
chunk.Type = FMP_CHUNK_SIMPLE_KEY_VALUE
chunk.Key = parseVarUint64(payload[1 : 1+2])
chunk.Value = payload[4 : 4+valueLength]
chunk.Length = 4 + uint64(valueLength)
chunk.Value = payload[4:chunk.Length]
case 0x0F:
valueLength := parseVarUint64(payload[3 : 3+2])
payloadLimit := min(5+valueLength, uint64(len(payload)))
chunk.Length = min(5+valueLength, uint64(len(payload)))
chunk.Type = FMP_CHUNK_SEGMENTED_DATA
chunk.Index = parseVarUint64(payload[1 : 1+2])
chunk.Value = payload[5:payloadLimit]
chunk.Length = 5 + valueLength
chunk.Value = payload[5:chunk.Length]
case 0x10, 0x11:
valueLength := 3 + (uint64(payload[0]) - 0x10)
valueLength := 3 + (uint64(chunkCode) - 0x10)
chunk.Length = 1 + valueLength
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1 : 1+valueLength]
chunk.Length = 1 + uint64(valueLength)
chunk.Value = payload[1:chunk.Length]
case 0x12, 0x13, 0x14, 0x15:
valueLength := 1 + 2*(uint64(payload[0])-0x10)
valueLength := 1 + 2*(uint64(chunkCode)-0x10)
chunk.Length = 1 + valueLength
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1 : 1+valueLength]
chunk.Length = 1 + uint64(valueLength)
chunk.Value = payload[1:chunk.Length]
case 0x16:
valueLength := uint64(payload[4])
chunk.Type = FMP_CHUNK_LONG_KEY_VALUE
chunk.Length = 5 + valueLength
chunk.Key = parseVarUint64(payload[1 : 1+3])
chunk.Value = payload[5 : 5+valueLength]
chunk.Length = 5 + uint64(valueLength)
chunk.Value = payload[5:chunk.Length]
case 0x17:
valueLength := parseVarUint64(payload[4 : 4+2])
chunk.Length = 6 + valueLength
chunk.Type = FMP_CHUNK_LONG_KEY_VALUE
chunk.Key = parseVarUint64(payload[1 : 1+3])
chunk.Value = payload[6 : 6+valueLength]
chunk.Length = 6 + uint64(valueLength)
chunk.Value = payload[6:chunk.Length]
case 0x19:
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1 : 1+1]
chunk.Length = 2
chunk.Value = payload[1:chunk.Length]
case 0x1A, 0x1B, 0x1C, 0x1D:
valueLength := 2 * uint64(payload[0]-0x19)
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1 : 1+valueLength]
valueLength := 2 * uint64(chunkCode-0x19)
chunk.Length = 1 + valueLength
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1:chunk.Length]
case 0x1E:
keyLength := uint64(payload[1])
valueLength := uint64(payload[2+keyLength])
chunk.Length = 2 + keyLength + 1 + valueLength
chunk.Type = FMP_CHUNK_LONG_KEY_VALUE
chunk.Key = parseVarUint64(payload[2 : 2+keyLength])
chunk.Value = payload[2+keyLength+1 : 2+keyLength+1+valueLength]
chunk.Length = 2 + uint64(keyLength) + 1 + uint64(valueLength)
chunk.Value = payload[2+keyLength+1 : chunk.Length]
case 0x1F:
keyLength := uint64(uint64(payload[1]))
valueLength := parseVarUint64(payload[2+keyLength : 2+keyLength+2+1])
chunk.Length = 2 + keyLength + 2 + valueLength
chunk.Type = FMP_CHUNK_LONG_KEY_VALUE
chunk.Key = parseVarUint64(payload[2 : 2+keyLength])
chunk.Value = payload[2+keyLength+2 : 2+keyLength+2+valueLength]
chunk.Length = 2 + uint64(keyLength) + 2 + uint64(valueLength)
chunk.Value = payload[2+keyLength+2 : chunk.Length]
case 0x20:
if payload[1] == 0xFE {
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1 : 1+8]
chunk.Length = 10
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1:chunk.Length]
break
}
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1 : 1+1]
chunk.Length = 2
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1:chunk.Length]
case 0x23:
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1 : 1+1]
chunk.Length = 2
chunk.Type = FMP_CHUNK_SIMPLE_DATA
chunk.Value = payload[1:chunk.Length]
case 0x28:
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1 : 1+2]
chunk.Length = 3
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1:chunk.Length]
case 0x30:
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1 : 1+3]
chunk.Length = 4
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[1:chunk.Length]
case 0x38:
valueLength := uint64(payload[1])
chunk.Length = 2 + valueLength
chunk.Type = FMP_CHUNK_PATH_PUSH
chunk.Value = payload[2 : 2+valueLength]
chunk.Length = 2 + uint64(valueLength)
chunk.Value = payload[2:chunk.Length]
case 0x3D, 0x40:
chunk.Type = FMP_CHUNK_PATH_POP