Only fail zip_source_read if a previous error occured during read. Fixes case where clonefile() fails (e.g. on HFS+).

diff --git a/lib/zip_source_function.c b/lib/zip_source_function.c
index 06ce5c9..bc74608 100644
--- a/lib/zip_source_function.c
+++ b/lib/zip_source_function.c

@@ -95,6 +95,7 @@
     src->refcount = 1;
     zip_error_init(&src->error);
     src->eof = false;
+    src->had_read_error = false;
 
     return src;
 }

diff --git a/lib/zip_source_open.c b/lib/zip_source_open.c
index a5712b2..e4cb0b3 100644
--- a/lib/zip_source_open.c
+++ b/lib/zip_source_open.c

@@ -68,6 +68,7 @@
     }
 
     src->eof = false;
+    src->had_read_error = false;
     _zip_error_clear(&src->error);
     src->open_count++;
     

diff --git a/lib/zip_source_read.c b/lib/zip_source_read.c
index 267128b..cd935ad 100644
--- a/lib/zip_source_read.c
+++ b/lib/zip_source_read.c

@@ -49,7 +49,7 @@
 	return -1;
     }
 
-    if (_zip_source_had_error(src)) {
+    if (src->had_read_error) {
 	return -1;
     }
 
@@ -60,6 +60,7 @@
     bytes_read = 0;
     while (bytes_read < len) {
 	if ((n = _zip_source_call(src, (zip_uint8_t *)data + bytes_read, len - bytes_read, ZIP_SOURCE_READ)) < 0) {
+            src->had_read_error = true;
 	    if (bytes_read == 0) {
 		return -1;
 	    }

diff --git a/lib/zipint.h b/lib/zipint.h
index e5f6095..a4e287c 100644
--- a/lib/zipint.h
+++ b/lib/zipint.h

@@ -330,6 +330,7 @@
     zip_t *source_archive;      /* zip archive we're reading from, NULL if not from archive */
     unsigned int refcount;
     bool eof;                   /* EOF reached */
+    bool had_read_error;    	/* a previous ZIP_SOURCE_READ reported an error */
 };
 
 #define ZIP_SOURCE_IS_OPEN_READING(src) ((src)->open_count > 0)