From 95b45d154e7f84a701bd908aa6362dbfe713decb Mon Sep 17 00:00:00 2001
From: Abimael Martell <abimex@gmail.com>
Date: Fri, 20 Mar 2026 19:42:11 -0700
Subject: [PATCH] fix(fonts): fall back to raw stream for uncompressed
 ToUnicode CMaps

lopdf's decompressed_content() fails with DictKey("Filter") when a
ToUnicode stream has no /Filter entry (uncompressed raw text). Now
falls back to the raw stream.content when decompression fails.

Fixes Identity-H fonts with valid uncompressed ToUnicode CMaps
producing empty text (e.g. neoenergia tabela PDF).
---
 src/extractor/content_stream.rs | 13 +++++++------
 src/extractor/xobjects.rs       | 13 +++++++------
 src/tounicode.rs                |  2 +-
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/src/extractor/content_stream.rs b/src/extractor/content_stream.rs
index ef7fe61..c1952b7 100644
--- a/src/extractor/content_stream.rs
+++ b/src/extractor/content_stream.rs
@@ -75,12 +75,13 @@ pub(crate) fn extract_page_text_items(
                 if let Ok(obj_ref) = tounicode.as_reference() {
                     font_tounicode_refs.insert(resource_name, obj_ref.0);
                 } else if let Object::Stream(s) = tounicode {
-                    if let Ok(data) = s.decompressed_content() {
-                        if let Some(entry) =
-                            crate::tounicode::build_cmap_entry_from_stream(&data, font_dict, doc, 0)
-                        {
-                            inline_cmaps.insert(resource_name, entry);
-                        }
+                    let data = s
+                        .decompressed_content()
+                        .unwrap_or_else(|_| s.content.clone());
+                    if let Some(entry) =
+                        crate::tounicode::build_cmap_entry_from_stream(&data, font_dict, doc, 0)
+                    {
+                        inline_cmaps.insert(resource_name, entry);
                     }
                 }
             }
diff --git a/src/extractor/xobjects.rs b/src/extractor/xobjects.rs
index 5491bb8..f780783 100644
--- a/src/extractor/xobjects.rs
+++ b/src/extractor/xobjects.rs
@@ -179,12 +179,13 @@ fn extract_form_xobject_text_inner(
                 if let Ok(obj_ref) = tounicode.as_reference() {
                     font_tounicode_refs.insert(resource_name, obj_ref.0);
                 } else if let Object::Stream(s) = tounicode {
-                    if let Ok(data) = s.decompressed_content() {
-                        if let Some(entry) =
-                            crate::tounicode::build_cmap_entry_from_stream(&data, font_dict, doc, 0)
-                        {
-                            inline_cmaps.insert(resource_name, entry);
-                        }
+                    let data = s
+                        .decompressed_content()
+                        .unwrap_or_else(|_| s.content.clone());
+                    if let Some(entry) =
+                        crate::tounicode::build_cmap_entry_from_stream(&data, font_dict, doc, 0)
+                    {
+                        inline_cmaps.insert(resource_name, entry);
                     }
                 }
             }
diff --git a/src/tounicode.rs b/src/tounicode.rs
index 2c25668..2a757ab 100644
--- a/src/tounicode.rs
+++ b/src/tounicode.rs
@@ -1734,7 +1734,7 @@ impl FontCMaps {
             };
             let data = match stream.decompressed_content() {
                 Ok(d) => d,
-                Err(_) => continue,
+                Err(_) => stream.content.clone(),
             };
             if let Some(cmap) = ToUnicodeCMap::parse(&data) {
                 debug!(