build: Simplify build structure

This will make libgit2 more suitable for embedding.

1 files changed, 22 insertions, 0 deletions

diff --git a/src/sha1.h b/src/sha1.h
new file mode 100644
index 000000000..558d6aece
--- /dev/null
+++ b/src/sha1.h
@@ -0,0 +1,22 @@
+/*
+ * SHA1 routine optimized to do word accesses rather than byte accesses,
+ * and to avoid unnecessary copies into the context array.
+ *
+ * This was initially based on the Mozilla SHA1 implementation, although
+ * none of the original Mozilla code remains.
+ */
+
+typedef struct {
+	unsigned long long size;
+	unsigned int H[5];
+	unsigned int W[16];
+} blk_SHA_CTX;
+
+void git__blk_SHA1_Init(blk_SHA_CTX *ctx);
+void git__blk_SHA1_Update(blk_SHA_CTX *ctx, const void *dataIn, unsigned long len);
+void git__blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx);
+
+#define SHA_CTX		blk_SHA_CTX
+#define SHA1_Init	git__blk_SHA1_Init
+#define SHA1_Update	git__blk_SHA1_Update
+#define SHA1_Final	git__blk_SHA1_Final