From 2efc46fff2c5884ecae99838ac34547cecae057f Mon Sep 17 00:00:00 2001
From: Aleksandr Vasilenko <phenomen@pm.me>
Date: Thu, 22 Jan 2026 09:37:00 -0600
Subject: [PATCH 1/4] Update wapi.zig

---
 src/wapi.zig | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/wapi.zig b/src/wapi.zig
index 86f6c33..48cd84c 100644
--- a/src/wapi.zig
+++ b/src/wapi.zig
@@ -119,6 +119,21 @@ export fn zpdf_extract_all(handle: i32, out_len: *usize) ?[*]u8 {
     return null;
 }
 
+/// Extract text from all pages as Markdown with semantic formatting
+/// Returns pointer to Markdown text buffer, sets out_len to buffer length
+/// Caller must free with wasm_free
+export fn zpdf_extract_all_markdown(handle: i32, out_len: *usize) ?[*]u8 {
+    if (handle < 0 or handle >= MAX_DOCUMENTS) return null;
+    const idx: usize = @intCast(handle);
+
+    if (documents[idx]) |doc| {
+        const result = doc.extractAllMarkdown(wasm_allocator) catch return null;
+        out_len.* = result.len;
+        return result.ptr;
+    }
+    return null;
+}
+
 /// Get page dimensions
 /// Returns 0 on success, -1 on error
 export fn zpdf_get_page_info(handle: i32, page_num: i32, width: *f64, height: *f64, rotation: *i32) i32 {

From 0ade580959a914a75f65298aa05536139c3cce6d Mon Sep 17 00:00:00 2001
From: Aleksandr Vasilenko <phenomen@pm.me>
Date: Thu, 22 Jan 2026 09:50:54 -0600
Subject: [PATCH 2/4] Implement CodeRabbit suggestion

---
 src/wapi.zig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/wapi.zig b/src/wapi.zig
index 48cd84c..9bb89e7 100644
--- a/src/wapi.zig
+++ b/src/wapi.zig
@@ -128,6 +128,13 @@ export fn zpdf_extract_all_markdown(handle: i32, out_len: *usize) ?[*]u8 {
 
     if (documents[idx]) |doc| {
         const result = doc.extractAllMarkdown(wasm_allocator) catch return null;
+
+        // Handle empty buffer - toOwnedSlice returns undefined ptr for empty slice
+        if (result.len == 0) {
+            out_len.* = 0;
+            return null;
+        }
+
         out_len.* = result.len;
         return result.ptr;
     }

From 070a5512b1967570eb5adfc5a8e06b21ae1a53e8 Mon Sep 17 00:00:00 2001
From: Aleksandr Vasilenko <phenomen@pm.me>
Date: Thu, 22 Jan 2026 09:58:15 -0600
Subject: [PATCH 3/4] More CodeRabbit review fixes

---
 src/capi.zig | 7 +++++++
 src/wapi.zig | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/capi.zig b/src/capi.zig
index bc723e9..c80589e 100644
--- a/src/capi.zig
+++ b/src/capi.zig
@@ -192,6 +192,13 @@ export fn zpdf_extract_all_markdown(handle: ?*ZpdfDocument, out_len: *usize) ?[*
     if (handle) |h| {
         const doc: *zpdf.Document = @ptrCast(@alignCast(h));
         const result = doc.extractAllMarkdown(c_allocator) catch return null;
+
+        // extractAllMarkdown returns an allocated slice; treat zero-length as "no data"
+        if (result.len == 0) {
+            out_len.* = 0;
+            return null;
+        }
+
         out_len.* = result.len;
         return result.ptr;
     }
diff --git a/src/wapi.zig b/src/wapi.zig
index 9bb89e7..0e1be51 100644
--- a/src/wapi.zig
+++ b/src/wapi.zig
@@ -129,7 +129,7 @@ export fn zpdf_extract_all_markdown(handle: i32, out_len: *usize) ?[*]u8 {
     if (documents[idx]) |doc| {
         const result = doc.extractAllMarkdown(wasm_allocator) catch return null;
 
-        // Handle empty buffer - toOwnedSlice returns undefined ptr for empty slice
+        // extractAllMarkdown returns an allocated slice; treat zero-length as "no data"
         if (result.len == 0) {
             out_len.* = 0;
             return null;

From c632babfc4b71b1cc17218a5eda35c3b5a4733ac Mon Sep 17 00:00:00 2001
From: Aleksandr Vasilenko <phenomen@pm.me>
Date: Thu, 22 Jan 2026 11:04:51 -0600
Subject: [PATCH 4/4] Free the zero-length buffer before returning null

---
 src/capi.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/capi.zig b/src/capi.zig
index c80589e..2b3dadc 100644
--- a/src/capi.zig
+++ b/src/capi.zig
@@ -195,6 +195,7 @@ export fn zpdf_extract_all_markdown(handle: ?*ZpdfDocument, out_len: *usize) ?[*
 
         // extractAllMarkdown returns an allocated slice; treat zero-length as "no data"
         if (result.len == 0) {
+            c_allocator.free(result);
             out_len.* = 0;
             return null;
         }