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Do not crash for missing block from Map #417

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Do not crash for missing block from Map #417

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40 changes: 21 additions & 19 deletions src/source/blockedsource.js
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Original file line number Diff line number Diff line change
Expand Up @@ -268,26 +268,28 @@ export class BlockedSource extends BaseSource {

for (let blockId = blockIdLow; blockId <= blockIdHigh; ++blockId) {
const block = blocks.get(blockId);
const delta = block.offset - slice.offset;
const topDelta = block.top - top;
let blockInnerOffset = 0;
let rangeInnerOffset = 0;
let usedBlockLength;

if (delta < 0) {
blockInnerOffset = -delta;
} else if (delta > 0) {
rangeInnerOffset = delta;
if (block) {
const delta = block.offset - slice.offset;
const topDelta = block.top - top;
let blockInnerOffset = 0;
let rangeInnerOffset = 0;
let usedBlockLength;

if (delta < 0) {
blockInnerOffset = -delta;
} else if (delta > 0) {
rangeInnerOffset = delta;
}

if (topDelta < 0) {
usedBlockLength = block.length - blockInnerOffset;
} else {
usedBlockLength = top - block.offset - blockInnerOffset;
}

const blockView = new Uint8Array(block.data, blockInnerOffset, usedBlockLength);
sliceView.set(blockView, rangeInnerOffset);
}

if (topDelta < 0) {
usedBlockLength = block.length - blockInnerOffset;
} else {
usedBlockLength = top - block.offset - blockInnerOffset;
}

const blockView = new Uint8Array(block.data, blockInnerOffset, usedBlockLength);
sliceView.set(blockView, rangeInnerOffset);
}

return sliceData;
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