@cleerlycode/cornerstone-wado-image-loader
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Cornerstone ImageLoader for DICOM WADO-URI
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<title>Code coverage report for src/imageLoader/wadors/getPixelData.js</title>
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<a href="../../../index.html">all files</a> / <a href="index.html">src/imageLoader/wadors/</a> getPixelData.js
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83</td><td class="line-coverage quiet"><span class="cline-any cline-neutral"> </span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { xhrRequest } from '../internal/index.js';
import findIndexOfString from './findIndexOfString.js';
function findBoundary (header) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > for (let i = 0; i < header.length; i++) {</span>
<span class="cstat-no" title="statement not covered" > if (header[i].substr(0, 2) === '--') {</span>
<span class="cstat-no" title="statement not covered" > return header[i];</span>
}
}
}
function findContentType (header) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > for (let i = 0; i < header.length; i++) {</span>
<span class="cstat-no" title="statement not covered" > if (header[i].substr(0, 13) === 'Content-Type:') {</span>
<span class="cstat-no" title="statement not covered" > return header[i].substr(13).trim();</span>
}
}
}
function uint8ArrayToString (data, offset, length) <span class="fstat-no" title="function not covered" >{</span>
<span class="cstat-no" title="statement not covered" > offset = offset || 0;</span>
<span class="cstat-no" title="statement not covered" > length = length || data.length - offset;</span>
let str = <span class="cstat-no" title="statement not covered" >'';</span>
<span class="cstat-no" title="statement not covered" > for (let i = offset; i < offset + length; i++) {</span>
<span class="cstat-no" title="statement not covered" > str += String.fromCharCode(data[i]);</span>
}
<span class="cstat-no" title="statement not covered" > return str;</span>
}
function getPixelData (uri, imageId, mediaType = 'application/octet-stream') <span class="fstat-no" title="function not covered" >{</span>
const headers = <span class="cstat-no" title="statement not covered" >{</span>
accept: mediaType
};
<span class="cstat-no" title="statement not covered" > return new Promise((resolve, reject) => <span class="fstat-no" title="function not covered" >{</span></span>
const loadPromise = <span class="cstat-no" title="statement not covered" >xhrRequest(uri, imageId, headers);</span>
<span class="cstat-no" title="statement not covered" > loadPromise.then(function (imageFrameAsArrayBuffer/* , xhr*/) <span class="fstat-no" title="function not covered" >{</span></span>
// request succeeded, Parse the multi-part mime response
const response = <span class="cstat-no" title="statement not covered" >new Uint8Array(imageFrameAsArrayBuffer);</span>
// First look for the multipart mime header
const tokenIndex = <span class="cstat-no" title="statement not covered" >findIndexOfString(response, '\r\n\r\n');</span>
<span class="cstat-no" title="statement not covered" > if (tokenIndex === -1) {</span>
<span class="cstat-no" title="statement not covered" > reject(new Error('invalid response - no multipart mime header'));</span>
}
const header = <span class="cstat-no" title="statement not covered" >uint8ArrayToString(response, 0, tokenIndex);</span>
// Now find the boundary marker
const split = <span class="cstat-no" title="statement not covered" >header.split('\r\n');</span>
const boundary = <span class="cstat-no" title="statement not covered" >findBoundary(split);</span>
<span class="cstat-no" title="statement not covered" > if (!boundary) {</span>
<span class="cstat-no" title="statement not covered" > reject(new Error('invalid response - no boundary marker'));</span>
}
const offset = <span class="cstat-no" title="statement not covered" >tokenIndex + 4;</span> // skip over the \r\n\r\n
// find the terminal boundary marker
const endIndex = <span class="cstat-no" title="statement not covered" >findIndexOfString(response, boundary, offset);</span>
<span class="cstat-no" title="statement not covered" > if (endIndex === -1) {</span>
<span class="cstat-no" title="statement not covered" > reject(new Error('invalid response - terminating boundary not found'));</span>
}
// Remove \r\n from the length
const length = <span class="cstat-no" title="statement not covered" >endIndex - offset - 2;</span>
// return the info for this pixel data
<span class="cstat-no" title="statement not covered" > resolve({</span>
contentType: findContentType(split),
imageFrame: {
pixelData: new Uint8Array(imageFrameAsArrayBuffer, offset, length)
}
});
});
});
}
export default getPixelData;
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