curl.h: allow up to 10M buffer size

Bump the limit from 512K. There might be reasons for applications using
h3 to set larger buffers and there is no strong reason for curl to have
a very small maximum.

Ref: https://curl.se/mail/lib-2023-01/0026.html

Closes #10256

diff --git a/docs/libcurl/opts/CURLOPT_BUFFERSIZE.3 b/docs/libcurl/opts/CURLOPT_BUFFERSIZE.3
index f96ac9beca406159c3933df15fb9455ac153b6c0..7e6a19a0793e9a90b0abe54a867bdf9f9be0cab6 100644 (file)
--- a/docs/libcurl/opts/CURLOPT_BUFFERSIZE.3
+++ b/docs/libcurl/opts/CURLOPT_BUFFERSIZE.3
@@ -41,11 +41,13 @@ This is just treated as a request, not an order. You cannot be guaranteed to
 actually get the given size.
 
 This buffer size is by default \fICURL_MAX_WRITE_SIZE\fP (16kB). The maximum
-buffer size allowed to be set is \fICURL_MAX_READ_SIZE\fP (512kB). The minimum
+buffer size allowed to be set is \fICURL_MAX_READ_SIZE\fP (10MB). The minimum
 buffer size allowed to be set is 1024.
 
 DO NOT set this option on a handle that is currently used for an active
 transfer as that may lead to unintended consequences.
+
+The maximum size was 512kB until 7.88.0.
 .SH DEFAULT
 CURL_MAX_WRITE_SIZE (16kB)
 .SH PROTOCOLS

diff --git a/include/curl/curl.h b/include/curl/curl.h
index fb6d409819a0c14523a01b11e883a940af9ee5da..c599b4d3fc47352245a84e001af436a839147555 100644 (file)
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -248,7 +248,7 @@ typedef int (*curl_xferinfo_callback)(void *clientp,
 
 #ifndef CURL_MAX_READ_SIZE
   /* The maximum receive buffer size configurable via CURLOPT_BUFFERSIZE. */
-#define CURL_MAX_READ_SIZE 524288
+#define CURL_MAX_READ_SIZE (10*1024*1024)
 #endif
 
 #ifndef CURL_MAX_WRITE_SIZE