From bb054d95d0336f8d36c85c5f1d8a98f935a3c131 Mon Sep 17 00:00:00 2001
From: Mark Adler <madler@alumni.caltech.edu>
Date: Fri, 2 Feb 2024 16:13:24 -0800
Subject: [PATCH] Stop decoding in zran.c once request is satisfied.

---
 examples/zran.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/examples/zran.c b/examples/zran.c
index 9c3e5dc..d3f5a36 100644
--- a/examples/zran.c
+++ b/examples/zran.c
@@ -402,8 +402,12 @@ ptrdiff_t deflate_index_extract(FILE *in, struct deflate_index *index,
         // Update the appropriate count.
         if (offset)
             offset -= got;
-        else
+        else {
             left -= got;
+            if (left == 0)
+                // Request satisfied.
+                break;
+        }
 
         // If we're at the end of a gzip member and there's more to read,
         // continue to the next gzip member.
@@ -450,7 +454,7 @@ ptrdiff_t deflate_index_extract(FILE *in, struct deflate_index *index,
 
         // Continue until we have the requested data, the deflate data has
         // ended, or an error is encountered.
-    } while (ret == Z_OK && left);
+    } while (ret == Z_OK);
     inflateEnd(&strm);
 
     // Return the number of uncompressed bytes read into buf, or the error.