feat(reader): add PDF reading support with outline chapters, CLI blocks, and noise filtering (task 7)

app/vendor/pypdf/_codecs/__init__.py

@@ -0,0 +1,59 @@
+from .adobe_glyphs import adobe_glyphs
+from .pdfdoc import _pdfdoc_encoding
+from .std import _std_encoding
+from .symbol import _symbol_encoding
+from .zapfding import _zapfding_encoding
+
+
+def fill_from_encoding(enc: str) -> list[str]:
+    lst: list[str] = []
+    for x in range(256):
+        try:
+            lst += (bytes((x,)).decode(enc),)
+        except Exception:
+            lst += (chr(x),)
+    return lst
+
+
+def rev_encoding(enc: list[str]) -> dict[str, int]:
+    rev: dict[str, int] = {}
+    for i in range(256):
+        char = enc[i]
+        if char == "\u0000":
+            continue
+        assert char not in rev, f"{char} at {i} already at {rev[char]}"
+        rev[char] = i
+    return rev
+
+
+def encoding_dict_from_named_encoding(encoding: str) -> dict[int, str]:
+    return dict(zip(range(256), fill_from_encoding(encoding)))
+
+
+_win_encoding = fill_from_encoding("cp1252")
+_mac_encoding = fill_from_encoding("mac_roman")
+
+
+_pdfdoc_encoding_rev: dict[str, int] = rev_encoding(_pdfdoc_encoding)
+
+
+charset_encoding: dict[str, list[str]] = {
+    "/StandardEncoding": _std_encoding,
+    "/WinAnsiEncoding": _win_encoding,
+    "/MacRomanEncoding": _mac_encoding,
+    "/PDFDocEncoding": _pdfdoc_encoding,
+    "/Symbol": _symbol_encoding,
+    "/ZapfDingbats": _zapfding_encoding,
+}
+
+__all__ = [
+    "_mac_encoding",
+    "_pdfdoc_encoding",
+    "_pdfdoc_encoding_rev",
+    "_std_encoding",
+    "_symbol_encoding",
+    "_win_encoding",
+    "_zapfding_encoding",
+    "adobe_glyphs",
+    "charset_encoding",
+]