From 9b8518ffc97696634cd6d493fed872a512993c52 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Wed, 3 Jul 2013 09:30:22 +0200
Subject: [PATCH] estream: Backport es_fopemem_init from master.

* common/estream.c (es_fopenmem_init): New.

Signed-off-by: Werner Koch <wk@gnupg.org>
---
 common/estream.c | 32 ++++++++++++++++++++++++++++++++
 common/estream.h |  3 +++
 2 files changed, 35 insertions(+)

diff --git a/common/estream.c b/common/estream.c
index 304e0e6ee..35b2af047 100644
--- a/common/estream.c
+++ b/common/estream.c
@@ -2362,6 +2362,38 @@ es_fopenmem (size_t memlimit, const char *ES__RESTRICT mode)
 }
 
 
+/* This is the same as es_fopenmem but intializes the memory with a
+   copy of (DATA,DATALEN).  The stream is initally set to the
+   beginning.  If MEMLIMIT is not 0 but shorter than DATALEN it
+   DATALEN will be used as the value for MEMLIMIT.  */
+estream_t
+es_fopenmem_init (size_t memlimit, const char *ES__RESTRICT mode,
+                  const void *data, size_t datalen)
+{
+  estream_t stream;
+
+  if (memlimit && memlimit < datalen)
+    memlimit = datalen;
+
+  stream = es_fopenmem (memlimit, mode);
+  if (stream && data && datalen)
+    {
+      if (es_writen (stream, data, datalen, NULL))
+        {
+          int saveerrno = errno;
+          es_fclose (stream);
+          stream = NULL;
+          _set_errno (saveerrno);
+        }
+      else
+        {
+          es_seek (stream, 0L, SEEK_SET, NULL);
+          es_set_indicators (stream, 0, 0);
+        }
+    }
+  return stream;
+}
+
 
 estream_t
 es_fopencookie (void *ES__RESTRICT cookie,
diff --git a/common/estream.h b/common/estream.h
index f72e4c6c6..35df20b67 100644
--- a/common/estream.h
+++ b/common/estream.h
@@ -76,6 +76,7 @@
 #define es_fopen              _ESTREAM_PREFIX(es_fopen)
 #define es_mopen              _ESTREAM_PREFIX(es_mopen)
 #define es_fopenmem           _ESTREAM_PREFIX(es_fopenmem)
+#define es_fopenmem_init      _ESTREAM_PREFIX(es_fopenmem_init)
 #define es_fdopen             _ESTREAM_PREFIX(es_fdopen)
 #define es_fdopen_nc          _ESTREAM_PREFIX(es_fdopen_nc)
 #define es_fpopen             _ESTREAM_PREFIX(es_fpopen)
@@ -243,6 +244,8 @@ estream_t es_mopen (unsigned char *ES__RESTRICT data,
 		    void (*func_free) (void *mem),
 		    const char *ES__RESTRICT mode);
 estream_t es_fopenmem (size_t memlimit, const char *ES__RESTRICT mode);
+estream_t es_fopenmem_init (size_t memlimit, const char *ES__RESTRICT mode,
+                            const void *data, size_t datalen);
 estream_t es_fdopen (int filedes, const char *mode);
 estream_t es_fdopen_nc (int filedes, const char *mode);
 estream_t es_fpopen (FILE *fp, const char *mode);