diff --git a/packages/napcat-image-size/src/index.ts b/packages/napcat-image-size/src/index.ts
index 8626a7a7..5e4f52be 100644
--- a/packages/napcat-image-size/src/index.ts
+++ b/packages/napcat-image-size/src/index.ts
@@ -1,3 +1,8 @@
+import { BmpParser } from '@/napcat-image-size/src/parser/BmpParser';
+import { GifParser } from '@/napcat-image-size/src/parser/GifParser';
+import { JpegParser } from '@/napcat-image-size/src/parser/JpegParser';
+import { PngParser } from '@/napcat-image-size/src/parser/PngParser';
+import { WebpParser } from '@/napcat-image-size/src/parser/WebpParser';
 import * as fs from 'fs';
 import { ReadStream } from 'fs';
 
@@ -15,14 +20,14 @@ export enum ImageType {
   UNKNOWN = 'unknown',
 }
 
-interface ImageParser {
+export interface ImageParser {
   readonly type: ImageType;
-  canParse(buffer: Buffer): boolean;
-  parseSize(stream: ReadStream): Promise<ImageSize | undefined>;
+  canParse (buffer: Buffer): boolean;
+  parseSize (stream: ReadStream): Promise<ImageSize | undefined>;
 }
 
 // 魔术匹配
-function matchMagic (buffer: Buffer, magic: number[], offset = 0): boolean {
+export function matchMagic (buffer: Buffer, magic: number[], offset = 0): boolean {
   if (buffer.length < offset + magic.length) {
     return false;
   }
@@ -35,309 +40,6 @@ function matchMagic (buffer: Buffer, magic: number[], offset = 0): boolean {
   return true;
 }
 
-// PNG解析器
-class PngParser implements ImageParser {
-  readonly type = ImageType.PNG;
-  // PNG 魔术头：89 50 4E 47 0D 0A 1A 0A
-  private readonly PNG_SIGNATURE = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
-
-  canParse (buffer: Buffer): boolean {
-    return matchMagic(buffer, this.PNG_SIGNATURE);
-  }
-
-  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
-    return new Promise((resolve, reject) => {
-      stream.once('error', reject);
-      stream.once('readable', () => {
-        const buf = stream.read(24) as Buffer;
-        if (!buf || buf.length < 24) {
-          return resolve(undefined);
-        }
-        if (this.canParse(buf)) {
-          const width = buf.readUInt32BE(16);
-          const height = buf.readUInt32BE(20);
-          resolve({ width, height });
-        } else {
-          resolve(undefined);
-        }
-      });
-    });
-  }
-}
-
-// JPEG解析器
-class JpegParser implements ImageParser {
-  readonly type = ImageType.JPEG;
-  // JPEG 魔术头：FF D8
-  private readonly JPEG_SIGNATURE = [0xFF, 0xD8];
-
-  // JPEG标记常量
-  private readonly SOF_MARKERS = {
-    SOF0: 0xC0, // 基线DCT
-    SOF1: 0xC1, // 扩展顺序DCT
-    SOF2: 0xC2, // 渐进式DCT
-    SOF3: 0xC3, // 无损
-  } as const;
-
-  // 非SOF标记
-  private readonly NON_SOF_MARKERS: number[] = [
-    0xC4, // DHT
-    0xC8, // JPEG扩展
-    0xCC, // DAC
-  ] as const;
-
-  canParse (buffer: Buffer): boolean {
-    return matchMagic(buffer, this.JPEG_SIGNATURE);
-  }
-
-  isSOFMarker (marker: number): boolean {
-    return (
-      marker === this.SOF_MARKERS.SOF0 ||
-            marker === this.SOF_MARKERS.SOF1 ||
-            marker === this.SOF_MARKERS.SOF2 ||
-            marker === this.SOF_MARKERS.SOF3
-    );
-  }
-
-  isNonSOFMarker (marker: number): boolean {
-    return this.NON_SOF_MARKERS.includes(marker);
-  }
-
-  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
-    return new Promise<ImageSize | undefined>((resolve, reject) => {
-      const BUFFER_SIZE = 1024; // 读取块大小，可以根据需要调整
-      let buffer = Buffer.alloc(0);
-      let offset = 0;
-      let found = false;
-
-      // 处理错误
-      stream.on('error', (err) => {
-        stream.destroy();
-        reject(err);
-      });
-
-      // 处理数据块
-      stream.on('data', (chunk: Buffer | string) => {
-        // 追加新数据到缓冲区
-        const chunkBuffer = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
-        buffer = Buffer.concat([buffer.subarray(offset), chunkBuffer]);
-        offset = 0;
-
-        // 保持缓冲区在合理大小内，只保留最后的部分用于跨块匹配
-        const bufferSize = buffer.length;
-        const MIN_REQUIRED_BYTES = 10; // SOF段最低字节数
-
-        // 从JPEG头部后开始扫描
-        while (offset < bufferSize - MIN_REQUIRED_BYTES) {
-          // 寻找FF标记
-          if (buffer[offset] === 0xFF && buffer[offset + 1]! >= 0xC0 && buffer[offset + 1]! <= 0xCF) {
-            const marker = buffer[offset + 1];
-            if (!marker) {
-              break;
-            }
-            // 跳过非SOF标记
-            if (this.isNonSOFMarker(marker)) {
-              offset += 2;
-              continue;
-            }
-
-            // 处理SOF标记 (包含尺寸信息)
-            if (this.isSOFMarker(marker)) {
-              // 确保缓冲区中有足够数据读取尺寸
-              if (offset + 9 < bufferSize) {
-                // 解析尺寸: FF XX YY YY PP HH HH WW WW ...
-                // XX = 标记, YY YY = 段长度, PP = 精度, HH HH = 高, WW WW = 宽
-                const height = buffer.readUInt16BE(offset + 5);
-                const width = buffer.readUInt16BE(offset + 7);
-
-                found = true;
-                stream.destroy();
-                resolve({ width, height });
-                return;
-              } else {
-                // 如果缓冲区内数据不够，保留当前位置等待更多数据
-                break;
-              }
-            }
-          }
-
-          offset++;
-        }
-
-        // 缓冲区管理: 如果处理了许多数据但没找到标记，
-        // 保留最后N字节用于跨块匹配，丢弃之前的数据
-        if (offset > BUFFER_SIZE) {
-          const KEEP_BYTES = 20; // 保留足够数据以处理跨块边界的情况
-          if (offset > KEEP_BYTES) {
-            buffer = buffer.subarray(offset - KEEP_BYTES);
-            offset = KEEP_BYTES;
-          }
-        }
-      });
-
-      // 处理流结束
-      stream.on('end', () => {
-        if (!found) {
-          resolve(undefined);
-        }
-      });
-    });
-  }
-}
-
-// BMP解析器
-class BmpParser implements ImageParser {
-  readonly type = ImageType.BMP;
-  // BMP 魔术头：42 4D (BM)
-  private readonly BMP_SIGNATURE = [0x42, 0x4D];
-
-  canParse (buffer: Buffer): boolean {
-    return matchMagic(buffer, this.BMP_SIGNATURE);
-  }
-
-  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
-    return new Promise((resolve, reject) => {
-      stream.once('error', reject);
-      stream.once('readable', () => {
-        const buf = stream.read(26) as Buffer;
-        if (!buf || buf.length < 26) {
-          return resolve(undefined);
-        }
-        if (this.canParse(buf)) {
-          const width = buf.readUInt32LE(18);
-          const height = buf.readUInt32LE(22);
-          resolve({ width, height });
-        } else {
-          resolve(undefined);
-        }
-      });
-    });
-  }
-}
-
-// GIF解析器
-class GifParser implements ImageParser {
-  readonly type = ImageType.GIF;
-  // GIF87a 魔术头：47 49 46 38 37 61
-  private readonly GIF87A_SIGNATURE = [0x47, 0x49, 0x46, 0x38, 0x37, 0x61];
-  // GIF89a 魔术头：47 49 46 38 39 61
-  private readonly GIF89A_SIGNATURE = [0x47, 0x49, 0x46, 0x38, 0x39, 0x61];
-
-  canParse (buffer: Buffer): boolean {
-    return (
-      matchMagic(buffer, this.GIF87A_SIGNATURE) ||
-            matchMagic(buffer, this.GIF89A_SIGNATURE)
-    );
-  }
-
-  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
-    return new Promise((resolve, reject) => {
-      stream.once('error', reject);
-      stream.once('readable', () => {
-        const buf = stream.read(10) as Buffer;
-        if (!buf || buf.length < 10) {
-          return resolve(undefined);
-        }
-        if (this.canParse(buf)) {
-          const width = buf.readUInt16LE(6);
-          const height = buf.readUInt16LE(8);
-          resolve({ width, height });
-        } else {
-          resolve(undefined);
-        }
-      });
-    });
-  }
-}
-
-// WEBP解析器 - 完整支持VP8, VP8L, VP8X格式
-class WebpParser implements ImageParser {
-  readonly type = ImageType.WEBP;
-  // WEBP RIFF 头：52 49 46 46 (RIFF)
-  private readonly RIFF_SIGNATURE = [0x52, 0x49, 0x46, 0x46];
-  // WEBP 魔术头：57 45 42 50 (WEBP)
-  private readonly WEBP_SIGNATURE = [0x57, 0x45, 0x42, 0x50];
-
-  // WEBP 块头
-  private readonly CHUNK_VP8 = [0x56, 0x50, 0x38, 0x20];  // "VP8 "
-  private readonly CHUNK_VP8L = [0x56, 0x50, 0x38, 0x4C]; // "VP8L"
-  private readonly CHUNK_VP8X = [0x56, 0x50, 0x38, 0x58]; // "VP8X"
-
-  canParse (buffer: Buffer): boolean {
-    return (
-      buffer.length >= 12 &&
-            matchMagic(buffer, this.RIFF_SIGNATURE, 0) &&
-            matchMagic(buffer, this.WEBP_SIGNATURE, 8)
-    );
-  }
-
-  isChunkType (buffer: Buffer, offset: number, chunkType: number[]): boolean {
-    return buffer.length >= offset + 4 && matchMagic(buffer, chunkType, offset);
-  }
-
-  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
-    return new Promise((resolve, reject) => {
-      // 需要读取足够的字节来检测所有三种格式
-      const MAX_HEADER_SIZE = 32;
-      let totalBytes = 0;
-      let buffer = Buffer.alloc(0);
-
-      stream.on('error', reject);
-
-      stream.on('data', (chunk: Buffer | string) => {
-        const chunkBuffer = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
-        buffer = Buffer.concat([buffer, chunkBuffer]);
-        totalBytes += chunk.length;
-
-        // 检查是否有足够的字节进行格式检测
-        if (totalBytes >= MAX_HEADER_SIZE) {
-          stream.destroy();
-
-          // 检查基本的WEBP签名
-          if (!this.canParse(buffer)) {
-            return resolve(undefined);
-          }
-
-          // 检查chunk头部，位于字节12-15
-          if (this.isChunkType(buffer, 12, this.CHUNK_VP8)) {
-            // VP8格式 - 标准WebP
-            // 宽度和高度在帧头中
-            const width = buffer.readUInt16LE(26) & 0x3FFF;
-            const height = buffer.readUInt16LE(28) & 0x3FFF;
-            return resolve({ width, height });
-          } else if (this.isChunkType(buffer, 12, this.CHUNK_VP8L)) {
-            // VP8L格式 - 无损WebP
-            // 1字节标记后是14位宽度和14位高度
-            const bits = buffer.readUInt32LE(21);
-            const width = 1 + (bits & 0x3FFF);
-            const height = 1 + ((bits >> 14) & 0x3FFF);
-            return resolve({ width, height });
-          } else if (this.isChunkType(buffer, 12, this.CHUNK_VP8X)) {
-            // VP8X格式 - 扩展WebP
-            // 24位宽度和高度(减去1)
-            if (!buffer[24] || !buffer[25] || !buffer[26] || !buffer[27] || !buffer[28] || !buffer[29]) {
-              return resolve(undefined);
-            }
-            const width = 1 + ((buffer[24] | (buffer[25] << 8) | (buffer[26] << 16)) & 0xFFFFFF);
-            const height = 1 + ((buffer[27] | (buffer[28] << 8) | (buffer[29] << 16)) & 0xFFFFFF);
-            return resolve({ width, height });
-          } else {
-            // 未知的WebP子格式
-            return resolve(undefined);
-          }
-        }
-      });
-
-      stream.on('end', () => {
-        // 如果没有读到足够的字节
-        if (totalBytes < MAX_HEADER_SIZE) {
-          resolve(undefined);
-        }
-      });
-    });
-  }
-}
-
 const parsers: ReadonlyArray<ImageParser> = [
   new PngParser(),
   new JpegParser(),
diff --git a/packages/napcat-image-size/src/parser/BmpParser.ts b/packages/napcat-image-size/src/parser/BmpParser.ts
new file mode 100644
index 00000000..8b3128af
--- /dev/null
+++ b/packages/napcat-image-size/src/parser/BmpParser.ts
@@ -0,0 +1,32 @@
+import { ImageParser, ImageType, matchMagic, ImageSize } from '@/napcat-image-size/src';
+import { ReadStream } from 'fs';
+
+// BMP解析器
+export class BmpParser implements ImageParser {
+  readonly type = ImageType.BMP;
+  // BMP 魔术头：42 4D (BM)
+  private readonly BMP_SIGNATURE = [0x42, 0x4D];
+
+  canParse (buffer: Buffer): boolean {
+    return matchMagic(buffer, this.BMP_SIGNATURE);
+  }
+
+  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
+    return new Promise((resolve, reject) => {
+      stream.once('error', reject);
+      stream.once('readable', () => {
+        const buf = stream.read(26) as Buffer;
+        if (!buf || buf.length < 26) {
+          return resolve(undefined);
+        }
+        if (this.canParse(buf)) {
+          const width = buf.readUInt32LE(18);
+          const height = buf.readUInt32LE(22);
+          resolve({ width, height });
+        } else {
+          resolve(undefined);
+        }
+      });
+    });
+  }
+}
diff --git a/packages/napcat-image-size/src/parser/GifParser.ts b/packages/napcat-image-size/src/parser/GifParser.ts
new file mode 100644
index 00000000..c82e1a10
--- /dev/null
+++ b/packages/napcat-image-size/src/parser/GifParser.ts
@@ -0,0 +1,37 @@
+import { ImageParser, ImageType, matchMagic, ImageSize } from '@/napcat-image-size/src';
+import { ReadStream } from 'fs';
+
+// GIF解析器
+export class GifParser implements ImageParser {
+  readonly type = ImageType.GIF;
+  // GIF87a 魔术头：47 49 46 38 37 61
+  private readonly GIF87A_SIGNATURE = [0x47, 0x49, 0x46, 0x38, 0x37, 0x61];
+  // GIF89a 魔术头：47 49 46 38 39 61
+  private readonly GIF89A_SIGNATURE = [0x47, 0x49, 0x46, 0x38, 0x39, 0x61];
+
+  canParse (buffer: Buffer): boolean {
+    return (
+      matchMagic(buffer, this.GIF87A_SIGNATURE) ||
+      matchMagic(buffer, this.GIF89A_SIGNATURE)
+    );
+  }
+
+  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
+    return new Promise((resolve, reject) => {
+      stream.once('error', reject);
+      stream.once('readable', () => {
+        const buf = stream.read(10) as Buffer;
+        if (!buf || buf.length < 10) {
+          return resolve(undefined);
+        }
+        if (this.canParse(buf)) {
+          const width = buf.readUInt16LE(6);
+          const height = buf.readUInt16LE(8);
+          resolve({ width, height });
+        } else {
+          resolve(undefined);
+        }
+      });
+    });
+  }
+}
diff --git a/packages/napcat-image-size/src/parser/JpegParser.ts b/packages/napcat-image-size/src/parser/JpegParser.ts
new file mode 100644
index 00000000..042c899b
--- /dev/null
+++ b/packages/napcat-image-size/src/parser/JpegParser.ts
@@ -0,0 +1,123 @@
+import { ImageParser, ImageType, matchMagic, ImageSize } from '@/napcat-image-size/src';
+import { ReadStream } from 'fs';
+
+// JPEG解析器
+export class JpegParser implements ImageParser {
+  readonly type = ImageType.JPEG;
+  // JPEG 魔术头：FF D8
+  private readonly JPEG_SIGNATURE = [0xFF, 0xD8];
+
+  // JPEG标记常量
+  private readonly SOF_MARKERS = {
+    SOF0: 0xC0, // 基线DCT
+    SOF1: 0xC1, // 扩展顺序DCT
+    SOF2: 0xC2, // 渐进式DCT
+    SOF3: 0xC3, // 无损
+  } as const;
+
+  // 非SOF标记
+  private readonly NON_SOF_MARKERS: number[] = [
+    0xC4, // DHT
+    0xC8, // JPEG扩展
+    0xCC, // DAC
+  ] as const;
+
+  canParse (buffer: Buffer): boolean {
+    return matchMagic(buffer, this.JPEG_SIGNATURE);
+  }
+
+  isSOFMarker (marker: number): boolean {
+    return (
+      marker === this.SOF_MARKERS.SOF0 ||
+      marker === this.SOF_MARKERS.SOF1 ||
+      marker === this.SOF_MARKERS.SOF2 ||
+      marker === this.SOF_MARKERS.SOF3
+    );
+  }
+
+  isNonSOFMarker (marker: number): boolean {
+    return this.NON_SOF_MARKERS.includes(marker);
+  }
+
+  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
+    return new Promise<ImageSize | undefined>((resolve, reject) => {
+      const BUFFER_SIZE = 1024; // 读取块大小，可以根据需要调整
+      let buffer = Buffer.alloc(0);
+      let offset = 0;
+      let found = false;
+
+      // 处理错误
+      stream.on('error', (err) => {
+        stream.destroy();
+        reject(err);
+      });
+
+      // 处理数据块
+      stream.on('data', (chunk: Buffer | string) => {
+        // 追加新数据到缓冲区
+        const chunkBuffer = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
+        buffer = Buffer.concat([buffer.subarray(offset), chunkBuffer]);
+        offset = 0;
+
+        // 保持缓冲区在合理大小内，只保留最后的部分用于跨块匹配
+        const bufferSize = buffer.length;
+        const MIN_REQUIRED_BYTES = 10; // SOF段最低字节数
+
+
+        // 从JPEG头部后开始扫描
+        while (offset < bufferSize - MIN_REQUIRED_BYTES) {
+          // 寻找FF标记
+          if (buffer[offset] === 0xFF && buffer[offset + 1]! >= 0xC0 && buffer[offset + 1]! <= 0xCF) {
+            const marker = buffer[offset + 1];
+            if (!marker) {
+              break;
+            }
+            // 跳过非SOF标记
+            if (this.isNonSOFMarker(marker)) {
+              offset += 2;
+              continue;
+            }
+
+            // 处理SOF标记 (包含尺寸信息)
+            if (this.isSOFMarker(marker)) {
+              // 确保缓冲区中有足够数据读取尺寸
+              if (offset + 9 < bufferSize) {
+                // 解析尺寸: FF XX YY YY PP HH HH WW WW ...
+                // XX = 标记, YY YY = 段长度, PP = 精度, HH HH = 高, WW WW = 宽
+                const height = buffer.readUInt16BE(offset + 5);
+                const width = buffer.readUInt16BE(offset + 7);
+
+                found = true;
+                stream.destroy();
+                resolve({ width, height });
+                return;
+              } else {
+                // 如果缓冲区内数据不够，保留当前位置等待更多数据
+                break;
+              }
+            }
+          }
+
+          offset++;
+        }
+
+        // 缓冲区管理: 如果处理了许多数据但没找到标记，
+        // 保留最后N字节用于跨块匹配，丢弃之前的数据
+        if (offset > BUFFER_SIZE) {
+          const KEEP_BYTES = 20; // 保留足够数据以处理跨块边界的情况
+          if (offset > KEEP_BYTES) {
+            buffer = buffer.subarray(offset - KEEP_BYTES);
+            offset = KEEP_BYTES;
+          }
+        }
+      });
+
+      // 处理流结束
+      stream.on('end', () => {
+        if (!found) {
+          resolve(undefined);
+        }
+      });
+    });
+  }
+}
diff --git a/packages/napcat-image-size/src/parser/PngParser.ts b/packages/napcat-image-size/src/parser/PngParser.ts
new file mode 100644
index 00000000..b0be8de0
--- /dev/null
+++ b/packages/napcat-image-size/src/parser/PngParser.ts
@@ -0,0 +1,32 @@
+import { ImageParser, ImageType, matchMagic, ImageSize } from '@/napcat-image-size/src';
+import { ReadStream } from 'fs';
+
+// PNG解析器
+export class PngParser implements ImageParser {
+  readonly type = ImageType.PNG;
+  // PNG 魔术头：89 50 4E 47 0D 0A 1A 0A
+  private readonly PNG_SIGNATURE = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
+
+  canParse (buffer: Buffer): boolean {
+    return matchMagic(buffer, this.PNG_SIGNATURE);
+  }
+
+  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
+    return new Promise((resolve, reject) => {
+      stream.once('error', reject);
+      stream.once('readable', () => {
+        const buf = stream.read(24) as Buffer;
+        if (!buf || buf.length < 24) {
+          return resolve(undefined);
+        }
+        if (this.canParse(buf)) {
+          const width = buf.readUInt32BE(16);
+          const height = buf.readUInt32BE(20);
+          resolve({ width, height });
+        } else {
+          resolve(undefined);
+        }
+      });
+    });
+  }
+}
diff --git a/packages/napcat-image-size/src/parser/WebpParser.ts b/packages/napcat-image-size/src/parser/WebpParser.ts
new file mode 100644
index 00000000..47ae52b0
--- /dev/null
+++ b/packages/napcat-image-size/src/parser/WebpParser.ts
@@ -0,0 +1,90 @@
+import { ImageParser, ImageType, matchMagic, ImageSize } from '@/napcat-image-size/src';
+import { ReadStream } from 'fs';
+
+// WEBP解析器 - 完整支持VP8, VP8L, VP8X格式
+export class WebpParser implements ImageParser {
+  readonly type = ImageType.WEBP;
+  // WEBP RIFF 头：52 49 46 46 (RIFF)
+  private readonly RIFF_SIGNATURE = [0x52, 0x49, 0x46, 0x46];
+  // WEBP 魔术头：57 45 42 50 (WEBP)
+  private readonly WEBP_SIGNATURE = [0x57, 0x45, 0x42, 0x50];
+
+  // WEBP 块头
+  private readonly CHUNK_VP8 = [0x56, 0x50, 0x38, 0x20]; // "VP8 "
+  private readonly CHUNK_VP8L = [0x56, 0x50, 0x38, 0x4C]; // "VP8L"
+  private readonly CHUNK_VP8X = [0x56, 0x50, 0x38, 0x58]; // "VP8X"
+
+  canParse (buffer: Buffer): boolean {
+    return (
+      buffer.length >= 12 &&
+      matchMagic(buffer, this.RIFF_SIGNATURE, 0) &&
+      matchMagic(buffer, this.WEBP_SIGNATURE, 8)
+    );
+  }
+
+  isChunkType (buffer: Buffer, offset: number, chunkType: number[]): boolean {
+    return buffer.length >= offset + 4 && matchMagic(buffer, chunkType, offset);
+  }
+
+  async parseSize (stream: ReadStream): Promise<ImageSize | undefined> {
+    return new Promise((resolve, reject) => {
+      // 需要读取足够的字节来检测所有三种格式
+      const MAX_HEADER_SIZE = 32;
+      let totalBytes = 0;
+      let buffer = Buffer.alloc(0);
+
+      stream.on('error', reject);
+
+      stream.on('data', (chunk: Buffer | string) => {
+        const chunkBuffer = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
+        buffer = Buffer.concat([buffer, chunkBuffer]);
+        totalBytes += chunk.length;
+
+        // 检查是否有足够的字节进行格式检测
+        if (totalBytes >= MAX_HEADER_SIZE) {
+          stream.destroy();
+
+          // 检查基本的WEBP签名
+          if (!this.canParse(buffer)) {
+            return resolve(undefined);
+          }
+
+          // 检查chunk头部，位于字节12-15
+          if (this.isChunkType(buffer, 12, this.CHUNK_VP8)) {
+            // VP8格式 - 标准WebP
+            // 宽度和高度在帧头中
+            const width = buffer.readUInt16LE(26) & 0x3FFF;
+            const height = buffer.readUInt16LE(28) & 0x3FFF;
+            return resolve({ width, height });
+          } else if (this.isChunkType(buffer, 12, this.CHUNK_VP8L)) {
+            // VP8L格式 - 无损WebP
+            // 1字节标记后是14位宽度和14位高度
+            const bits = buffer.readUInt32LE(21);
+            const width = 1 + (bits & 0x3FFF);
+            const height = 1 + ((bits >> 14) & 0x3FFF);
+            return resolve({ width, height });
+          } else if (this.isChunkType(buffer, 12, this.CHUNK_VP8X)) {
+            // VP8X格式 - 扩展WebP
+            // 24位宽度和高度(减去1)
+            if (!buffer[24] || !buffer[25] || !buffer[26] || !buffer[27] || !buffer[28] || !buffer[29]) {
+              return resolve(undefined);
+            }
+            const width = 1 + ((buffer[24] | (buffer[25] << 8) | (buffer[26] << 16)) & 0xFFFFFF);
+            const height = 1 + ((buffer[27] | (buffer[28] << 8) | (buffer[29] << 16)) & 0xFFFFFF);
+            return resolve({ width, height });
+          } else {
+            // 未知的WebP子格式
+            return resolve(undefined);
+          }
+        }
+      });
+
+      stream.on('end', () => {
+        // 如果没有读到足够的字节
+        if (totalBytes < MAX_HEADER_SIZE) {
+          resolve(undefined);
+        }
+      });
+    });
+  }
+}