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fix utf8 decoding for 4 octets and implement utf8 decoding up to 7 octets

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Illusion
2024-06-11 23:28:21 +02:00
parent eb75487902
commit 5c69629872
1 changed files with 5 additions and 19 deletions
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flac.odin
+5 -19
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@@ -932,9 +932,6 @@ decode_extended_utf8 :: proc(r: ^Reader) -> (decoded_num: u64, err: Error) {
decoded_num = u64(0)
fmt.println("cur offset", r.i)
fmt.println("cur offset bits", r.bits_read_in_byte)
first_byte := read_byte(r) or_return
utf8_sequence_len := 0
@@ -947,37 +944,25 @@ decode_extended_utf8 :: proc(r: ^Reader) -> (decoded_num: u64, err: Error) {
}
}
fmt.println("seq len:", utf8_sequence_len)
if utf8_sequence_len > 0 {
octets := make([dynamic]byte, 0, 8)
for i := utf8_sequence_len - 1; i > 0; i -= 1 {
append(&octets, read_byte(r) or_return)
}
// TODO: Implement the rest of the utf8 seq len
switch utf8_sequence_len {
case 2:
fmt.printfln("first utf8 byte:0x%X", first_byte & MASK2)
fmt.printfln("second utf8 byte:0x%X", octets[0] & MASKX)
decoded_num = (u64(first_byte) & MASK2) << 6 | (u64(octets[0]) & MASKX)
case 3:
fmt.printfln("first utf8 byte:0x%X", first_byte & MASK3)
fmt.printfln("second utf8 byte:0x%X", octets[0] & MASKX)
fmt.printfln("third utf8 byte:0x%X", octets[1] & MASKX)
decoded_num = (u64(first_byte) & MASK3) << 12 | (u64(octets[0]) & MASKX) << 6 | (u64(octets[1]) & MASKX)
case 4:
fmt.printfln("first utf8 byte:0x%X", first_byte & MASK4)
fmt.printfln("second utf8 byte:0x%X", octets[0] & MASKX)
fmt.printfln("third utf8 byte:0x%X", octets[1] & MASKX)
fmt.printfln("fourth utf8 byte:0x%X", octets[2] & MASKX)
decoded_num = (u64(first_byte) & MASK3) << 18 | (u64(octets[0]) & MASKX) << 12 | (u64(octets[1]) & MASKX) << 6 | (u64(octets[0]) & MASKX)
decoded_num = (u64(first_byte) & MASK4) << 18 | (u64(octets[0]) & MASKX) << 12 | (u64(octets[1]) & MASKX) << 6 | (u64(octets[2]) & MASKX)
case 5:
return 0, .Unimplemented_Utf8
decoded_num = (u64(first_byte) & MASK5) << 24 | (u64(octets[0]) & MASKX) << 18 | (u64(octets[1]) & MASKX) << 12 | (u64(octets[2]) & MASKX) << 6 | (u64(octets[3]) & MASKX)
case 6:
return 0, .Unimplemented_Utf8
decoded_num = (u64(first_byte) & MASK6) << 30 | (u64(octets[0]) & MASKX) << 24 | (u64(octets[1]) & MASKX) << 18 | (u64(octets[2]) & MASKX) << 12 | (u64(octets[3]) & MASKX) << 6 | (u64(octets[4]) & MASKX)
case 7:
return 0, .Unimplemented_Utf8
decoded_num = (u64(octets[0]) & MASKX) << 30 | (u64(octets[1]) & MASKX) << 24 | (u64(octets[2]) & MASKX) << 18 | (u64(octets[3]) & MASKX) << 12 | (u64(octets[4]) & MASKX) << 6 | (u64(octets[5]) & MASKX)
}
} else {
decoded_num = u64(first_byte & 0x7F)
@@ -1107,6 +1092,7 @@ load_from_bytes :: proc(data: []byte, allocator := context.allocator) -> (err: E
}
case .PICTURE:
// TODO: save the pic data into a struct
// TODO: maybe put all of these into a struct so we do one big read?
pic_type := read_data(&r, PictureType) or_return
mime_len := read_data(&r, u32be) or_return
mimetype := string(read_slice(&r, auto_cast mime_len) or_return)