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Merge pull request #549 from DieHertz/blackbox-download-huffman-decoding

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Huffman decoding functionality
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Martin Budden 2017-08-01 09:19:53 +01:00 • committed by GitHub
commit f34d97d6dd
5 changed files with 366 additions and 6 deletions
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18
js/msp/MSPHelper.js
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@ -1529,6 +1529,11 @@ MspHelper.prototype.dataflashRead = function(address, blockSize, onDataCallback)
outData = outData.concat([blockSize & 0xFF, (blockSize >> 8) & 0xFF]);
}
if (semver.gte(CONFIG.apiVersion, "1.36.0")) {
// Allow compression
outData = outData.concat([1]);
}
MSP.send_message(MSPCodes.MSP_DATAFLASH_READ, outData, false, function(response) {
if (!response.crcError) {
var chunkAddress = response.data.readU32();
@ -1547,7 +1552,18 @@ MspHelper.prototype.dataflashRead = function(address, blockSize, onDataCallback)
/* Strip that address off the front of the reply and deliver it separately so the caller doesn't have to
* figure out the reply format:
*/
onDataCallback(address, new DataView(response.data.buffer, response.data.byteOffset + headerSize, dataSize));
if (dataCompressionType == 0) {
onDataCallback(address, new DataView(response.data.buffer, response.data.byteOffset + headerSize, dataSize), dataSize);
} else if (dataCompressionType == 1) {
// Read compressed char count to avoid decoding stray bit sequences as bytes
var compressedCharCount = response.data.readU16();
// Compressed format uses 2 additional bytes as a pseudo-header to denote the number of uncompressed bytes
var compressedArray = new Uint8Array(response.data.buffer, response.data.byteOffset + headerSize + 2, dataSize - 2);
var decompressedArray = huffmanDecodeBuf(compressedArray, compressedCharCount, defaultHuffmanTree, defaultHuffmanLenIndex);
onDataCallback(address, new DataView(decompressedArray.buffer), dataSize);
}
} else {
// Report address error
console.log('Expected address ' + address + ' but received ' + chunkAddress + ' - retrying');