fix: restore complete admin feature dependencies

src/lib/services/swf/swf-parser.ts

@@ -0,0 +1,153 @@
+/**
+ * Low-level SWF file parsing: decompression, tag reading, symbol class.
+ */
+
+import { inflateSync } from 'node:zlib'
+import LZMA from 'lzma'
+
+// ── SWF Tag Types ──────────────────────────────────────────────────
+export const TAG_END = 0
+export const TAG_DEFINE_BITS_LOSSLESS = 20
+export const TAG_DEFINE_BITS_JPEG2 = 21
+export const TAG_DEFINE_BITS_JPEG3 = 35
+export const TAG_DEFINE_BITS_LOSSLESS2 = 36
+export const TAG_SYMBOL_CLASS = 76
+export const TAG_DEFINE_BINARY_DATA = 87
+
+// ── Interfaces ─────────────────────────────────────────────────────
+
+export interface SwfTag {
+  type: number
+  data: Buffer
+}
+
+export interface SymbolClassResult {
+  /** charID → first symbol name (canonical name) */
+  classNames: Map<number, string>
+  /** symbol name → charID (all symbols including aliases) */
+  symbols: Map<string, number>
+}
+
+// ── SWF Header Parsing ─────────────────────────────────────────────
+
+export function decompressSwf(buffer: Buffer): Buffer {
+  const sig = buffer.toString('ascii', 0, 3)
+
+  if (sig === 'FWS') {
+    return buffer
+  }
+
+  if (sig === 'CWS') {
+    const header = Buffer.alloc(8)
+    buffer.copy(header, 0, 0, 8)
+    header.write('FWS', 0, 3, 'ascii')
+    const compressed = buffer.subarray(8)
+    const decompressed = inflateSync(compressed)
+    return Buffer.concat([header, decompressed])
+  }
+
+  if (sig === 'ZWS') {
+    const fileLength = buffer.readUInt32LE(4)
+    const compressedSize = buffer.readUInt32LE(8)
+    const lzmaData = buffer.subarray(12, 12 + compressedSize)
+
+    const props = lzmaData.subarray(0, 5)
+    const compressedPayload = lzmaData.subarray(5)
+
+    const uncompressedSize = fileLength - 8
+    const lzmaHeader = Buffer.alloc(13)
+    props.copy(lzmaHeader, 0)
+    lzmaHeader.writeUInt32LE(uncompressedSize, 5)
+    lzmaHeader.writeUInt32LE(0, 9)
+
+    const lzmaStream = Buffer.concat([lzmaHeader, compressedPayload])
+    const decompressed = Buffer.from(LZMA.decompress(lzmaStream) as number[])
+
+    const header = Buffer.alloc(8)
+    buffer.copy(header, 0, 0, 8)
+    header.write('FWS', 0, 3, 'ascii')
+    return Buffer.concat([header, decompressed])
+  }
+
+  throw new Error(`Unknown SWF signature: ${sig}`)
+}
+
+function readRect(buf: Buffer, offset: number): number {
+  const nbits = (buf[offset] >> 3) & 0x1f
+  const totalBits = 5 + nbits * 4
+  const totalBytes = Math.ceil(totalBits / 8)
+  return offset + totalBytes
+}
+
+// ── SWF Tag Reader ─────────────────────────────────────────────────
+
+export function parseSwfTags(swfBuffer: Buffer): SwfTag[] {
+  const tags: SwfTag[] = []
+
+  let offset = 8
+  offset = readRect(swfBuffer, offset)
+  offset += 4
+
+  while (offset < swfBuffer.length) {
+    if (offset + 2 > swfBuffer.length) break
+
+    const tagCodeAndLength = swfBuffer.readUInt16LE(offset)
+    offset += 2
+
+    const tagType = (tagCodeAndLength >> 6) & 0x3ff
+    let tagLength = tagCodeAndLength & 0x3f
+
+    if (tagLength === 0x3f) {
+      if (offset + 4 > swfBuffer.length) break
+      tagLength = swfBuffer.readUInt32LE(offset)
+      offset += 4
+    }
+
+    if (tagType === TAG_END) break
+    if (offset + tagLength > swfBuffer.length) break
+
+    const tagData = swfBuffer.subarray(offset, offset + tagLength)
+    tags.push({ type: tagType, data: Buffer.from(tagData) })
+    offset += tagLength
+  }
+
+  return tags
+}
+
+// ── SymbolClass Parser ─────────────────────────────────────────────
+
+export function parseSymbolClass(data: Buffer): SymbolClassResult {
+  const classNames = new Map<number, string>()
+  const symbols = new Map<string, number>()
+  let offset = 0
+
+  const numSymbols = data.readUInt16LE(offset)
+  offset += 2
+
+  for (let i = 0; i < numSymbols; i++) {
+    if (offset + 2 > data.length) break
+    const charId = data.readUInt16LE(offset)
+    offset += 2
+
+    const strStart = offset
+    while (offset < data.length && data[offset] !== 0) offset++
+    const name = data.toString('utf-8', strStart, offset)
+    offset++
+
+    symbols.set(name, charId)
+    if (!classNames.has(charId)) {
+      classNames.set(charId, name)
+    }
+  }
+
+  return { classNames, symbols }
+}
+
+// ── DefineBinaryData Parser ────────────────────────────────────────
+
+export function parseBinaryData(data: Buffer): { id: number; content: Buffer } {
+  const id = data.readUInt16LE(0)
+  const content = data.subarray(6)
+  return { id, content }
+}
+