1 files changed, 59 insertions, 0 deletions
diff --git a/libskrift_open_font_fd.c b/libskrift_open_font_fd.c
new file mode 100644
index 0000000..c00422e
--- /dev/null
+++ b/libskrift_open_font_fd.c
@@ -0,0 +1,59 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+int
+libskrift_open_font_fd(LIBSKRIFT_FONT **fontp, int fd)
+{
+	int saved_errno;
+	struct stat st;
+	char *mem = NULL, *new;
+	size_t size = 0, off = 0;
+	int mmapped = 0;
+	ssize_t r;
+
+	saved_errno = errno;
+	if (fstat(fd, &st) < 0 || !st.st_size || !S_ISREG(st.st_mode)) {
+		for (;;) {
+			if (off + 2048 > size) {
+				size += 8192;
+				new = realloc(mem, size);
+				if (!new) {
+					free(mem);
+					return -1;
+				}
+				mem = new;
+			}
+			r = read(fd, &mem[off], size - off);
+			if (r <= 0) {
+				if (!r)
+					break;
+				free(mem);
+				return -1;
+			}
+			off += (size_t)r;
+		}
+		size = off;
+		new = realloc(mem, size);
+		if (new)
+			mem = new;
+		errno = saved_errno;
+	} else {
+		mem = mmap(NULL, (size_t)st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+		size = (size_t)st.st_size;
+		mmapped = 1;
+	}
+
+	if (libskrift_open_font_mem(fontp, mem, size)) {
+		if (mmapped)
+			munmap(mem, size);
+		else
+			free(mem);
+		return -1;
+	}
+
+	(*fontp)->memory_free  = mmapped ? NULL : mem;
+	(*fontp)->memory_unmap = mmapped ? mem : NULL;
+	(*fontp)->memory_size  = size;
+
+	return 0;
+}