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Replace the AnnotationStorage.lastModified-getter with a proper hash-method

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The current `lastModified`-getter, which only contains a time-stamp, is a fairly crude way of detecting if the stored data has actually been changed. In particular, when the `getRawValue`-method is used, the `lastModified`-getter doesn't cope with data being modified from the "outside".

To fix these issues[1], and to prevent any future bugs in this code, this patch introduces a new `AnnotationStorage.hash`-getter which computes a hash of the currently stored data. To simplify things this re-uses the existing `MurmurHash3_64`-implementation, which required moving that file into the `src/shared/`-folder, since its performance should be good enough here.

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[1] Given how the `AnnotationStorage.lastModified`-getter was used, this would have been limited to *printing* of forms.
This commit is contained in:
Jonas Jenwald 2022-05-04 15:03:46 +02:00
parent 8135d7ccf6
commit 8267fd8a52
5 changed files with 14 additions and 10 deletions
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src/core/evaluator.js
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@ -75,7 +75,7 @@ import { DecodeStream } from "./decode_stream.js";
import { getGlyphsUnicode } from "./glyphlist.js";
import { getLookupTableFactory } from "./core_utils.js";
import { getMetrics } from "./metrics.js";
import { MurmurHash3_64 } from "./murmurhash3.js";
import { MurmurHash3_64 } from "../shared/murmurhash3.js";
import { OperatorList } from "./operator_list.js";
import { PDFImage } from "./image.js";