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playwav: parser more resilient against fields with extra zeros

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minjaesong
2023-01-25 18:46:55 +09:00
parent 801ae0c29b
commit 1f0b8a0a8d
2 changed files with 22 additions and 4 deletions
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21
assets/disk0/tvdos/bin/playwav.js
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@@ -13,7 +13,7 @@ const pcm = require("pcm")
function printComments() {
for (const [key, value] of Object.entries(comments)) {
printdbg(`${key}: ${value}`)
printdbg(`Wave Comment ${key}: ${value}`)
}
}
@@ -207,14 +207,31 @@ while (!stopPlay && seqread.getReadCount() < FILE_SIZE - 8) {
let startOffset = seqread.getReadCount()
let subChunkName = seqread.readFourCC()
while (seqread.getReadCount() < startOffset + chunkSize) {
printdbg(`${chunkName} ${subChunkName}`)
if ("INFO" == subChunkName) {
let key = seqread.readFourCC()
let valueLen = seqread.readInt()
// f-you WAVE encoders with nonstandard behaviours
// related: https://stackoverflow.com/questions/49537639/riff-icmt-tag-size-doesnt-seem-to-match-data
while (0 == key.charCodeAt(0)) {
printdbg(`Previous key had more zero bytes padded than its marked length, skipping one byte...`)
let kbytes = [key.charCodeAt(1), key.charCodeAt(2), key.charCodeAt(3), valueLen & 255]
let klen = [(valueLen >>> 8) & 255, (valueLen >>> 16) & 255, (valueLen >>> 24) & 255, seqread.readOneByte()]
key = String.fromCharCode.apply(null, kbytes)
valueLen = klen[0] | (klen[1] << 8) | (klen[2] << 16) | (klen[3] << 24)
}
printdbg(`Reading LIST INFO ${key}[${[0,1,2,3].map((i)=>"0x"+key.charCodeAt(i).toString(16).padStart(2,'0'))}] (${valueLen} bytes): `)
let value = seqread.readString(valueLen)
printdbg(" |"+value)
comments[key] = value
}
else {
printdbg(`LIST skip subchunk ${subChunkName} (${startOffset + chunkSize - seqread.getReadCount()} bytes)`)
seqread.skip(startOffset + chunkSize - seqread.getReadCount())
}
}