1 files changed, 64 insertions, 0 deletions
diff --git a/src/unix/map.c b/src/unix/map.c
new file mode 100644
index 000000000..1f50bcf2e
--- /dev/null
+++ b/src/unix/map.c
@@ -0,0 +1,64 @@
+#include <git2/common.h>
+
+#ifndef GIT_WIN32
+
+#include "map.h"
+#include <sys/mman.h>
+#include <errno.h>
+
+int git__mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
+{
+	int mprot = 0;
+	int mflag = 0;
+
+	assert((out != NULL) && (len > 0));
+
+	if ((out == NULL) || (len == 0)) {
+		errno = EINVAL;
+		return git__throw(GIT_ERROR, "Failed to mmap. No map or zero length");
+	}
+
+	out->data = NULL;
+	out->len = 0;
+
+	if (prot & GIT_PROT_WRITE)
+		mprot = PROT_WRITE;
+	else if (prot & GIT_PROT_READ)
+		mprot = PROT_READ;
+	else {
+		errno = EINVAL;
+		return git__throw(GIT_ERROR, "Failed to mmap. Invalid protection parameters");
+	}
+
+	if ((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED)
+		mflag = MAP_SHARED;
+	else if ((flags & GIT_MAP_TYPE) == GIT_MAP_PRIVATE)
+		mflag = MAP_PRIVATE;
+
+	if (flags & GIT_MAP_FIXED) {
+		errno = EINVAL;
+		return git__throw(GIT_ERROR, "Failed to mmap. FIXED not set");
+	}
+
+	out->data = mmap(NULL, len, mprot, mflag, fd, offset);
+	if (!out->data || out->data == MAP_FAILED)
+		return git__throw(GIT_EOSERR, "Failed to mmap. Could not write data");
+	out->len = len;
+
+	return GIT_SUCCESS;
+}
+
+int git__munmap(git_map *map)
+{
+	assert(map != NULL);
+
+	if (!map)
+		return git__throw(GIT_ERROR, "Failed to munmap. Map does not exist");
+
+	munmap(map->data, map->len);
+
+	return GIT_SUCCESS;
+}
+
+#endif
+