Add reading of BIOS parameter block

src/components/DiskInfo.vue

@@ -0,0 +1,19 @@
+<script lang="ts" setup>
+import { computed } from 'vue'
+import { getBiosParameterBlock } from '@/floppy/disk.ts'
+
+const { data = new ArrayBuffer(0) } = defineProps<{ data: ArrayBuffer }>()
+
+const biosParameterBlock = computed(() => {
+  return getBiosParameterBlock(data)
+})
+</script>
+
+<template>
+  <section v-if="biosParameterBlock">
+    <h3>BIOS Parameter Block (BPB)</h3>
+    <pre>{{ biosParameterBlock }}</pre>
+  </section>
+</template>
+
+<style scoped></style>

src/components/HomeView.vue

@@ -1,10 +1,8 @@
 <script lang="ts" setup></script>
 
 <template>
-  <header>
-    <h1>Floppy Drive</h1>
-    <p>Load floppy disk(images) right from your browser.</p>
-  </header>
+  <h1>Floppy Drive</h1>
+  <p>Load floppy disk(images) right from your browser.</p>
   <section>
     <h2>What is it?</h2>
     <p>
@@ -22,10 +20,4 @@
   </section>
 </template>
 
-<style scoped>
-header p {
-  margin: 0;
-  font-style: italic;
-  font-size: 0.95em;
-}
-</style>
+<style scoped></style>

src/components/PlaygroundView.vue

@@ -2,6 +2,7 @@
 import { ref } from 'vue'
 import DiskReader from '@/components/DiskReader.vue'
 import HexDump from '@/components/HexDump.vue'
+import DiskInfo from '@/components/DiskInfo.vue'
 
 type DiskReadyState = 'empty' | 'read-started' | 'read-success' | 'read-failed'
 
@@ -45,39 +46,41 @@ function onReadProgress(read: number, total: number) {
   <nav>
     <a href="/#/">Home</a>
   </nav>
+  <h1>Playground</h1>
+  <p>This is my playground for testing out my code.</p>
+  <p>
+    <strong><em>WARNING!!!</em> Use at your own risk!</strong>
+  </p>
   <section>
-    <h2>Playground</h2>
-    <p>This is my playground for testing out my code.</p>
-    <p>
-      <strong><em>WARNING!!!</em> Use at your own risk!</strong>
-    </p>
-    <section>
-      <h3>Disk Read</h3>
-      <div class="cols">
-        <DiskReader
-          @error="onReadError"
-          @progress="onReadProgress"
-          @start="onReadStart"
-          @success="onReadSuccess"
-        />
-        <div v-if="diskReadyState === 'read-started'">
-          {{ diskName }} reading
-          <progress :max="diskTotalBytes" :value="diskReadBytes">
-            {{ ((diskReadBytes / diskTotalBytes) * 100.0).toFixed(2) }} %
-          </progress>
+    <h2>Disk Read</h2>
+    <div class="cols">
+      <DiskReader
+        @error="onReadError"
+        @progress="onReadProgress"
+        @start="onReadStart"
+        @success="onReadSuccess"
+      />
+      <div v-if="diskReadyState === 'read-started'">
+        {{ diskName }} reading
+        <progress :max="diskTotalBytes" :value="diskReadBytes">
           {{ ((diskReadBytes / diskTotalBytes) * 100.0).toFixed(2) }} %
-        </div>
-        <div v-else-if="diskReadyState === 'read-success'">{{ diskName }} loaded</div>
-        <div v-else-if="diskReadyState === 'read-failed'">
-          error reading disk: {{ diskReadError }}
-        </div>
-        <div v-else>No disk loaded</div>
+        </progress>
+        {{ ((diskReadBytes / diskTotalBytes) * 100.0).toFixed(2) }} %
       </div>
-    </section>
-    <section>
-      <h3>Disk Hex Dump</h3>
-      <HexDump :buffer="diskData" />
-    </section>
+      <div v-else-if="diskReadyState === 'read-success'">{{ diskName }} loaded</div>
+      <div v-else-if="diskReadyState === 'read-failed'">
+        error reading disk: {{ diskReadError }}
+      </div>
+      <div v-else>No disk loaded</div>
+    </div>
+  </section>
+  <section>
+    <h2>Disk Hex Dump</h2>
+    <HexDump :buffer="diskData" />
+  </section>
+  <section>
+    <h2>Disk Info</h2>
+    <DiskInfo :data="diskData" />
   </section>
 </template>
 

src/floppy/disk.ts

@@ -0,0 +1,61 @@
+export interface BiosParameterBlock {
+  oemId: string
+  bytesPerSector: number
+  sectorsPerCluster: number
+  numReservedSectors: number
+  numFATs: number
+  numRootDirEntries: number
+  totalSectors: number
+  mediaTypeDescriptor: number
+  sectorsPerFAT: number
+  sectorsPerTrack: number
+  numHeads: number
+  bootSignature: number
+  volumeId: number
+  volumeLabel: string
+  fileSystemId: string
+}
+
+export function getBiosParameterBlock(buffer: ArrayBuffer): BiosParameterBlock | null {
+  if (buffer.byteLength < 64) {
+    return null
+  }
+
+  const data = new DataView(buffer)
+
+  const asciiDecoder = new TextDecoder('ascii')
+
+  const oemId = asciiDecoder.decode(buffer.slice(3, 11))
+  const bytesPerSector = data.getUint16(11, true)
+  const sectorsPerCluster = data.getUint8(13)
+  const numReservedSectors = data.getUint16(14, true)
+  const numFATs = data.getUint8(16)
+  const numRootDirEntries = data.getUint16(17, true)
+  const totalSectors = data.getUint16(19, true)
+  const mediaTypeDescriptor = data.getUint8(21)
+  const sectorsPerFAT = data.getUint16(22, true)
+  const sectorsPerTrack = data.getUint16(24, true)
+  const numHeads = data.getUint16(26, true)
+  const bootSignature = data.getUint8(38)
+  const volumeId = data.getUint32(39, true)
+  const volumeLabel = asciiDecoder.decode(buffer.slice(43, 54))
+  const fileSystemId = asciiDecoder.decode(buffer.slice(54, 62))
+
+  return {
+    oemId,
+    bytesPerSector,
+    sectorsPerCluster,
+    numReservedSectors,
+    numFATs,
+    numRootDirEntries,
+    totalSectors,
+    mediaTypeDescriptor,
+    sectorsPerFAT,
+    sectorsPerTrack,
+    numHeads,
+    bootSignature,
+    volumeId,
+    volumeLabel,
+    fileSystemId,
+  }
+}