feat(app-image): add custom app desc dump and SPI pin drive display

components/app-image-viewer/AppImageViewer.vue

@@ -34,6 +34,10 @@ function formatHex(val: number): string {
   return '0x' + val.toString(16).toUpperCase();
 }
 
+function formatHexDump(data: Uint8Array): string {
+  return Array.from(data).map(b => b.toString(16).padStart(2, '0')).join(' ');
+}
+
 function formatSha256(data: Uint8Array): string {
   // Check if all zeros (not computed)
   if (data.every(b => b === 0)) return '(未计算)';
@@ -110,6 +114,7 @@ async function handleOpenFile(file: File): Promise<false> {
         <el-descriptions-item label="Flash大小">{{ SPI_FLASH_SIZE_NAMES[imageInfo.header.spiSize] ?? formatHex(imageInfo.header.spiSize) }}</el-descriptions-item>
         <el-descriptions-item label="段数">{{ imageInfo.header.segmentCount }}</el-descriptions-item>
         <el-descriptions-item label="WP引脚">{{ formatHex(imageInfo.extendedHeader.wpPin) }}</el-descriptions-item>
+        <el-descriptions-item label="SPI引脚驱动">{{ imageInfo.extendedHeader.spiPinDrv.map(formatHex).join(' / ') }}</el-descriptions-item>
         <el-descriptions-item label="最小芯片版本">{{ imageInfo.extendedHeader.minChipRevFull / 100 }}</el-descriptions-item>
         <el-descriptions-item label="最大芯片版本">{{ imageInfo.extendedHeader.maxChipRevFull === 0xFFFF ? '不限' : imageInfo.extendedHeader.maxChipRevFull / 100 }}</el-descriptions-item>
         <el-descriptions-item label="附加哈希">{{ imageInfo.extendedHeader.hashAppended ? '是' : '否' }}</el-descriptions-item>
@@ -128,6 +133,14 @@ async function handleOpenFile(file: File): Promise<false> {
           </template>
         </el-table-column>
       </el-table>
+
+      <!-- Custom App Description (raw bytes) -->
+      <template v-if="imageInfo.customDescRawBytes && !imageInfo.customDescRawBytes.every(b => b === 0)">
+        <el-text tag="b" class="block mb-2">自定义应用描述（偏移 288 B，原始字节）</el-text>
+        <el-text size="small" class="font-mono break-all">
+          {{ formatHexDump(imageInfo.customDescRawBytes) }}
+        </el-text>
+      </template>
     </template>
 
     <el-empty v-else description="请打开一个ESP32固件文件 (.bin)" />

lib/app-image/constants.ts

@@ -16,6 +16,12 @@ export const APP_DESC_MAGIC = 0xABCD5432;
 /** Size of esp_app_desc_t structure */
 export const APP_DESC_SIZE = 256;
 
+/** Offset of custom app desc within first segment data (immediately after esp_app_desc_t) */
+export const CUSTOM_DESC_OFFSET_IN_SEGMENT = APP_DESC_SIZE; // 256
+
+/** How many raw bytes to extract for the custom app desc dump */
+export const CUSTOM_DESC_DUMP_SIZE = 64;
+
 /** Chip ID to human-readable name */
 export const CHIP_ID_NAMES: Record<number, string> = {
   0x0000: 'ESP32',

lib/app-image/parser.ts

@@ -5,6 +5,7 @@ import type {
 import {
   IMAGE_MAGIC, IMAGE_HEADER_SIZE, EXTENDED_HEADER_SIZE,
   SEGMENT_HEADER_SIZE, APP_DESC_MAGIC, APP_DESC_SIZE, CHIP_ID_NAMES,
+  CUSTOM_DESC_OFFSET_IN_SEGMENT, CUSTOM_DESC_DUMP_SIZE,
 } from './constants';
 
 /**
@@ -93,11 +94,21 @@ export function parseAppImage(data: Uint8Array): AppImageInfo {
     }
   }
 
+  // ── Custom App Description — fixed offset in first segment ──
+  let customDescRawBytes: Uint8Array | null = null;
+  if (segDataOffsets.length > 0) {
+    const customOff = segDataOffsets[0] + CUSTOM_DESC_OFFSET_IN_SEGMENT;
+    if (customOff + CUSTOM_DESC_DUMP_SIZE <= data.length) {
+      customDescRawBytes = new Uint8Array(data.subarray(customOff, customOff + CUSTOM_DESC_DUMP_SIZE));
+    }
+  }
+
   return {
     header,
     extendedHeader,
     segments,
     appDescription,
+    customDescRawBytes,
     valid: segments.length === segmentCount, // false if image was truncated mid-segment
     chipName: CHIP_ID_NAMES[chipId] ?? `Unknown (0x${chipId.toString(16)})`,
   };

lib/app-image/types.ts

@@ -63,6 +63,8 @@ export interface AppImageInfo {
   extendedHeader: ExtendedHeader;
   segments: SegmentHeader[];
   appDescription: AppDescription | null;
+  /** Raw bytes at the custom app desc location (null if first segment too short) */
+  customDescRawBytes: Uint8Array | null;
   valid: boolean;
   chipName: string;
 }