-
Notifications
You must be signed in to change notification settings - Fork 2
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
feat: v0.1.4 | Add support for DG4 (Iris image)
- Loading branch information
Showing
9 changed files
with
270 additions
and
29 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| import TLV from "node-tlv" | ||
| import { Enums, Interfaces } from "./index"; | ||
|
|
||
| /** | ||
| * Class for working with DG4 (Iris) | ||
| * @experimental | ||
| */ | ||
| export class DG4 { | ||
| /** | ||
| * Extract int from buffer | ||
| * @param data Buffer | ||
| * @param start Offset | ||
| * @param end Offset+length | ||
| */ | ||
| private extractContent(data: Buffer, start: number, end: number): number { | ||
| if (end - start == 1) { | ||
| return data.subarray(start, end).readUInt8(); | ||
| } else if (end - start < 4) { | ||
| return data.subarray(start, end).readInt16BE(); | ||
| } | ||
| else if(end - start == 4) { | ||
| return data.subarray(start,end).readInt32BE() | ||
| } | ||
| return parseInt(data.subarray(start,end).toString("hex"), 16) | ||
| } | ||
| /** | ||
| * Read Biometric data block | ||
| * @param tlv | ||
| */ | ||
| readBDB(tlv: TLV): Interfaces.DecodedIris { | ||
| if(parseInt(tlv.tag, 16) != 0x7f60) throw new Error(`Invalid object tag "0x${tlv.tag}", expected 0x7f60`); | ||
| let sbh = tlv.child[0] | ||
| let firstBlock = tlv.child[1] | ||
| if(parseInt(firstBlock.tag, 16) != 0x5f2e && parseInt(firstBlock.tag, 16) != 0x7f2e) throw new Error(`Invalid object tag "0x${tlv.tag}", expected 0x5f2e or 0x7f2e`); | ||
| let data = firstBlock.bValue | ||
|
|
||
| if(data.subarray(0,4).readInt32BE() != 0x49495200) throw new Error("Biometric data block is invalid"); | ||
| let offset = 4 | ||
|
|
||
| if(this.extractContent(data, offset, offset+4) != 0x30313000) throw new Error("Version of Biometric data is not valid"); | ||
| offset += 4; | ||
|
|
||
| let lengthOfRecord = this.extractContent(data, offset, offset + 4); | ||
| offset += 4; | ||
| //let dataLength = lengthOfRecord - 45; | ||
|
|
||
| let captureDeviceId = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let count = this.extractContent(data, offset, offset + 1); | ||
| offset += 1; | ||
|
|
||
| if(count > 1) console.warn("[DG4] The record contains more than 1 image.") | ||
|
|
||
| let recordHeaderLength = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| if(recordHeaderLength != 45) throw new Error(`Expected header length 45, found ${recordHeaderLength}`); | ||
|
|
||
| let imagePropertiesBits = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let irisDiameter = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let imageType = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let imageWidth = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let imageHeight = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let depth = this.extractContent(data, offset, offset + 1); | ||
| offset += 1; | ||
|
|
||
| let imageTransformation = this.extractContent(data, offset, offset + 1); | ||
| offset += 1; | ||
|
|
||
| let deviceUniqueId = this.extractContent(data, offset, offset + 16); | ||
| offset += 16; | ||
|
|
||
| let biometricSubtype = this.extractContent(data, offset, offset + 1); | ||
| offset += 1; | ||
|
|
||
| let biometricSubtypeCount = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| if(biometricSubtypeCount > 1) console.warn("[DG4] The record contains more than 1 image.") | ||
|
|
||
| let imageNumber = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let quality = this.extractContent(data, offset, offset + 1); | ||
| offset += 1; | ||
|
|
||
| let rotationAngle = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let rotationAngleUncertainty = this.extractContent(data, offset, offset + 2); | ||
| offset += 2; | ||
|
|
||
| let imageEnd = this.extractContent(data, offset, offset + 4) & 4294967295; | ||
| offset += 4; | ||
|
|
||
| let imageData = data.subarray(offset, offset + imageEnd) | ||
|
|
||
| return { | ||
| sbh, | ||
| lengthOfRecord, | ||
| captureDeviceId, | ||
| imagePropertiesBits, | ||
| irisDiameter, | ||
| imageType, | ||
| imageWidth, | ||
| imageHeight, | ||
| depth, | ||
| imageTransformation, | ||
| deviceUniqueId, | ||
| biometricSubtype, | ||
| quality, | ||
| rotationAngle, | ||
| rotationAngleUncertainty, | ||
| imageData | ||
| } | ||
| } | ||
| /** | ||
| * Get image of eye iris | ||
| * @param data Data of EF.DG4 file | ||
| */ | ||
| static load(data: string | Buffer): Interfaces.DecodedIris[] { | ||
| let tlv = TLV.parse(data) | ||
| if(parseInt(tlv.tag, 16) != Enums.TAGS.DG4) throw new Error(`Invalid DG4 tag "0x${tlv.tag}", expected 0x${Enums.TAGS.DG4.toString(16)}`); | ||
|
|
||
| let bigt = tlv.child[0] | ||
| if(parseInt(bigt.tag, 16) != 0x7f61) throw new Error(`Invalid object tag "0x${bigt.tag}", expected 0x7f61`); | ||
|
|
||
| let bict = bigt.child[0] | ||
| if(parseInt(bict.tag, 16) != 0x02) throw new Error(`Invalid object tag "0x${bict.tag}", expected 0x02`); | ||
|
|
||
| let bitCount = parseInt(bigt.child[0].value, 16) | ||
| let results = [] | ||
| for(let i = 0; i < bitCount; i++) { | ||
| results.push(new DG4().readBDB(bigt.child[i + 1])) | ||
| } | ||
| return results | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Binary file not shown.
Oops, something went wrong.