1 files changed, 100 insertions, 0 deletions
diff --git a/src/hash/helper.c b/src/hash/helper.c
new file mode 100644
index 0000000..fe3f3e7
--- /dev/null
+++ b/src/hash/helper.c
@@ -0,0 +1,100 @@
+/**	$MirOS: src/lib/libc/hash/helper.c,v 1.5 2007/05/07 15:21:18 tg Exp $ */
+/*	$OpenBSD: helper.c,v 1.8 2005/08/08 08:05:35 espie Exp $	*/
+
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@login.dkuug.dk> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <hashinc>
+
+/* ARGSUSED */
+char *
+HASHEnd(HASH_CTX *ctx, char *buf)
+{
+	int i;
+	u_int8_t digest[HASH_DIGEST_LENGTH];
+#ifdef HASH_DIGEST_UPPERCASE
+	static const char hex[] = "0123456789ABCDEF";
+#else
+	static const char hex[] = "0123456789abcdef";
+#endif
+
+	if (buf == NULL && (buf = malloc(HASH_DIGEST_STRING_LENGTH)) == NULL)
+		return (NULL);
+
+	HASHFinal(digest, ctx);
+	for (i = 0; i < HASH_DIGEST_LENGTH; i++) {
+		buf[i + i] = hex[digest[i] >> 4];
+		buf[i + i + 1] = hex[digest[i] & 0x0f];
+	}
+	buf[i + i] = '\0';
+	memset(digest, 0, sizeof(digest));
+	return (buf);
+}
+
+char *
+HASHFileChunk(const char *filename, char *buf, off_t off, off_t len)
+{
+	struct stat sb;
+	u_char buffer[BUFSIZ];
+	HASH_CTX ctx;
+	int fd, save_errno;
+	ssize_t nr;
+
+	HASHInit(&ctx);
+
+	if ((fd = open(filename, O_RDONLY)) < 0)
+		return (NULL);
+	if (len == 0) {
+		if (fstat(fd, &sb) == -1) {
+			close(fd);
+			return (NULL);
+		}
+		len = sb.st_size;
+	}
+	if ((len < 0) || (off > 0 && lseek(fd, off, SEEK_SET) < 0))
+		return (NULL);
+
+	while ((nr = read(fd, buffer,
+	    (size_t)(len ? MIN(BUFSIZ, len) : BUFSIZ))) > 0) {
+		HASHUpdate(&ctx, buffer, (size_t)nr);
+		if (len > 0 && (len -= nr) == 0)
+			break;
+	}
+
+	save_errno = errno;
+	close(fd);
+	errno = save_errno;
+	return (nr < 0 ? NULL : HASHEnd(&ctx, buf));
+}
+
+char *
+HASHFile(const char *filename, char *buf)
+{
+	return (HASHFileChunk(filename, buf, (off_t)0, (off_t)0));
+}
+
+char *
+HASHData(const u_char *data, size_t len, char *buf)
+{
+	HASH_CTX ctx;
+
+	HASHInit(&ctx);
+	HASHUpdate(&ctx, data, len);
+	return (HASHEnd(&ctx, buf));
+}