Fix Encoding CMaps exceeding the 100-entry cidchar block limit

CHANGELOG.md

@@ -21,7 +21,7 @@ This can also be enabled programmatically with `warnings.simplefilter('default',
 * support for page number alias substitution with bidirectional / RTL text shaping - _cf._ [issue #1925](https://github.com/py-pdf/fpdf2/issues/1925) - thanks to @prateek-dagar
 * `appearance` parameter for [`FPDF.file_attachment_annotation()`](https://py-pdf.github.io/fpdf2/fpdf/fpdf.html#fpdf.fpdf.FPDF.file_attachment_annotation), accepting `FileAttachmentAppearance.HIDDEN` to give the annotation an empty appearance stream so its default icon is not displayed while the file stays embedded and reachable - _cf._ [issue #561](https://github.com/py-pdf/fpdf2/issues/561)
 ### Fixed
-* split font `/ToUnicode` CMap mappings into blocks of at most 100 entries, as required by the PDF specification - _cf._ [issue #1952](https://github.com/py-pdf/fpdf2/issues/1952)
+* split font `/ToUnicode` and `/Encoding` CMap mappings into blocks of at most 100 entries, as required by the PDF specification - _cf._ [issue #1952](https://github.com/py-pdf/fpdf2/issues/1952)
 * visual gap in rendering subsequent text after `{nb}` page alias when text shaping is enabled - _cf._ [issue #1090](https://github.com/py-pdf/fpdf2/issues/1090) - thanks to @prateek-dagar
 * `FPDF.write_html()` no longer raises `IndexError: pop from empty list` when a `<ul>` or `<ol>` element carries a `line-height` that is not a bare number (_e.g._ `line-height: normal` or `line-height: 1.5em`); such values are now ignored, and the default line height is used, consistently with `<p line-height="x">` - _cf._ [PR #1917](https://github.com/py-pdf/fpdf2/pull/1917)
 * `FPDF.write_html()` now renders list bullets with correct font styling instead of inheriting preceding heading (e.g. `<h1>`) styles - _cf._ [issue #1921](https://github.com/py-pdf/fpdf2/issues/1921)

fpdf/output.py

@@ -1303,7 +1303,7 @@ def _add_fonts(
                         "1 begincodespacerange\n"
                         "<00> <FF>\n"
                         "endcodespacerange\n"
-                        f"{_build_bfchar_blocks(bfChar)}"
+                        f"{_build_cmap_blocks(bfChar, 'bfchar')}"
                         "endcmap\n"
                         "CMapName currentdict /CMap defineresource pop\n"
                         "end\n"
@@ -1490,7 +1490,7 @@ def format_code(unicode: int) -> str:
                         "1 begincodespacerange\n"
                         "<0000> <FFFF>\n"
                         "endcodespacerange\n"
-                        f"{_build_bfchar_blocks(bfChar)}"
+                        f"{_build_cmap_blocks(bfChar, 'bfchar')}"
                         "endcmap\n"
                         "CMapName currentdict /CMap defineresource pop\n"
                         "end\n"
@@ -1525,9 +1525,7 @@ def format_code(unicode: int) -> str:
                             "1 begincodespacerange\n"
                             "<0000> <FFFF>\n"
                             "endcodespacerange\n"
-                            f"{len(cid_mapping)} begincidchar\n"
-                            f"{''.join(cid_mapping)}"
-                            "endcidchar\n"
+                            f"{_build_cmap_blocks(cid_mapping, 'cidchar')}"
                             "endcmap\n"
                             "CMapName currentdict /CMap defineresource pop\n"
                             "end\n"
@@ -2271,12 +2269,14 @@ def stream_content_for_raster_image(
     )
 
 
-def _build_bfchar_blocks(entries: list[str]) -> str:
-    """Limit CMap bfchar blocks to 100 entries (Adobe Technical Note #5014)."""
+def _build_cmap_blocks(
+    entries: list[str], operator: Literal["bfchar", "cidchar"]
+) -> str:
+    """Limit CMap mapping blocks to 100 entries (Adobe Technical Note #5014)."""
     blocks: list[str] = []
     for start in range(0, len(entries), 100):
         chunk = entries[start : start + 100]
-        blocks.append(f"{len(chunk)} beginbfchar\n{''.join(chunk)}endbfchar\n")
+        blocks.append(f"{len(chunk)} begin{operator}\n{''.join(chunk)}end{operator}\n")
     return "".join(blocks)