Just put it all in buffer.

include/git2.h

@@ -13,7 +13,6 @@
 #include "git2/blame.h"
 #include "git2/branch.h"
 #include "git2/buffer.h"
-#include "git2/buf_text.h"
 #include "git2/checkout.h"
 #include "git2/cherrypick.h"
 #include "git2/clone.h"

include/git2/buffer.h

@@ -105,6 +105,22 @@ GIT_EXTERN(int) git_buf_grow(git_buf *buffer, size_t target_size);
 GIT_EXTERN(int) git_buf_set(
 	git_buf *buffer, const void *data, size_t datalen);
 
+/**
+* Check quickly if buffer looks like it contains binary data
+*
+* @param buf Buffer to check
+* @return 1 if buffer looks like non-text data
+*/
+GIT_EXTERN(int) git_buf_is_binary(const git_buf *buf);
+
+/**
+* Check quickly if buffer contains a NUL byte
+*
+* @param buf Buffer to check
+* @return 1 if buffer contains a NUL byte
+*/
+GIT_EXTERN(int) git_buf_contains_nul(const git_buf *buf);
+
 GIT_END_DECL
 
 /** @} */

src/buf_text.c

@@ -176,7 +176,7 @@ int git_buf_text_common_prefix(git_buf *buf, const git_strarray *strings)
 	return 0;
 }
 
-int git_buf_text_is_binary(const git_buf *buf)
+bool git_buf_text_is_binary(const git_buf *buf)
 {
 	const char *scan = buf->ptr, *end = buf->ptr + buf->size;
 	git_bom_t bom;
@@ -201,7 +201,7 @@ int git_buf_text_is_binary(const git_buf *buf)
 	return ((printable >> 7) < nonprintable);
 }
 
-int git_buf_text_contains_nul(const git_buf *buf)
+bool git_buf_text_contains_nul(const git_buf *buf)
 {
 	return (memchr(buf->ptr, '\0', buf->size) != NULL);
 }

src/buf_text.h

@@ -7,7 +7,6 @@
 #ifndef INCLUDE_buf_text_h__
 #define INCLUDE_buf_text_h__
 
-#include "git2/buf_text.h"
 #include "buffer.h"
 
 typedef enum {
@@ -78,6 +77,22 @@ extern int git_buf_text_lf_to_crlf(git_buf *tgt, const git_buf *src);
  */
 extern int git_buf_text_common_prefix(git_buf *buf, const git_strarray *strs);
 
+/**
+ * Check quickly if buffer looks like it contains binary data
+ *
+ * @param buf Buffer to check
+ * @return true if buffer looks like non-text data
+ */
+extern bool git_buf_text_is_binary(const git_buf *buf);
+
+/**
+ * Check quickly if buffer contains a NUL byte
+ *
+ * @param buf Buffer to check
+ * @return true if buffer contains a NUL byte
+ */
+extern bool git_buf_text_contains_nul(const git_buf *buf);
+
 /**
  * Check if a buffer begins with a UTF BOM
  *

src/buffer.c

@@ -7,6 +7,7 @@
 #include "buffer.h"
 #include "posix.h"
 #include "git2/buffer.h"
+#include "buf_text.h"
 #include <ctype.h>
 
 /* Used as default value for git_buf->ptr so that people can always
@@ -141,6 +142,16 @@ int git_buf_set(git_buf *buf, const void *data, size_t len)
 	return 0;
 }
 
+int git_buf_is_binary(const git_buf *buf)
+{
+	return git_buf_text_is_binary(buf);
+}
+
+int git_buf_contains_nul(const git_buf *buf)
+{
+	return git_buf_text_contains_nul(buf);
+}
+
 int git_buf_sets(git_buf *buf, const char *string)
 {
 	return git_buf_set(buf, string, string ? strlen(string) : 0);