# Copyright (C) 2006 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
# expose (again) an hash_fd function (used in 911-ipkg.patch)
#
diff -ruN busybox-1.2.0-orig/coreutils/md5_sha1_sum.c busybox-1.2.0-libbb_hash/coreutils/md5_sha1_sum.c
--- busybox-1.2.0-orig/coreutils/md5_sha1_sum.c	2006-07-01 00:42:07.000000000 +0200
+++ busybox-1.2.0-libbb_hash/coreutils/md5_sha1_sum.c	2006-07-22 17:08:02.000000000 +0200
@@ -16,79 +16,10 @@
 
 #include "busybox.h"
 
-typedef enum { HASH_SHA1, HASH_MD5 } hash_algo_t;
-
 #define FLAG_SILENT	1
 #define FLAG_CHECK	2
 #define FLAG_WARN	4
 
-/* This might be useful elsewhere */
-static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
-									  unsigned char hash_length)
-{
-	int x, len, max;
-	unsigned char *hex_value;
-
-	max = (hash_length * 2) + 2;
-	hex_value = xmalloc(max);
-	for (x = len = 0; x < hash_length; x++) {
-		len += snprintf((char*)(hex_value + len), max - len, "%02x", hash_value[x]);
-	}
-	return (hex_value);
-}
-
-static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
-{
-	int src_fd, hash_len, count;
-	union _ctx_ {
-		sha1_ctx_t sha1;
-		md5_ctx_t md5;
-	} context;
-	uint8_t *hash_value = NULL;
-	RESERVE_CONFIG_UBUFFER(in_buf, 4096);
-	void (*update)(const void*, size_t, void*);
-	void (*final)(void*, void*);
-
-	if (strcmp(filename, "-") == 0) {
-		src_fd = STDIN_FILENO;
-	} else if(0 > (src_fd = open(filename, O_RDONLY))) {
-		bb_perror_msg("%s", filename);
-		return NULL;
-	}
-
-	/* figure specific hash algorithims */
-	if (ENABLE_MD5SUM && hash_algo==HASH_MD5) {
-		md5_begin(&context.md5);
-		update = (void (*)(const void*, size_t, void*))md5_hash;
-		final = (void (*)(void*, void*))md5_end;
-		hash_len = 16;
-	} else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) {
-		sha1_begin(&context.sha1);
-		update = (void (*)(const void*, size_t, void*))sha1_hash;
-		final = (void (*)(void*, void*))sha1_end;
-		hash_len = 20;
-	} else {
-		bb_error_msg_and_die("algorithm not supported");
-	}
-
-	while (0 < (count = read(src_fd, in_buf, 4096))) {
-		update(in_buf, count, &context);
-	}
-
-	if (count == 0) {
-		final(in_buf, &context);
-		hash_value = hash_bin_to_hex(in_buf, hash_len);
-	}
-
-	RELEASE_CONFIG_BUFFER(in_buf);
-
-	if (src_fd != STDIN_FILENO) {
-		close(src_fd);
-	}
-
-	return hash_value;
-}
-
 /* This could become a common function for md5 as well, by using md5_stream */
 static int hash_files(int argc, char **argv, hash_algo_t hash_algo)
 {
diff -ruN busybox-1.2.0-orig/include/libbb.h busybox-1.2.0-libbb_hash/include/libbb.h
--- busybox-1.2.0-orig/include/libbb.h	2006-07-01 00:42:10.000000000 +0200
+++ busybox-1.2.0-libbb_hash/include/libbb.h	2006-07-22 17:01:06.000000000 +0200
@@ -518,6 +518,8 @@
 extern int get_terminal_width_height(int fd, int *width, int *height);
 extern unsigned long get_ug_id(const char *s, long (*__bb_getxxnam)(const char *));
 
+typedef enum { HASH_SHA1, HASH_MD5 } hash_algo_t;
+
 typedef struct _sha1_ctx_t_ {
 	uint32_t count[2];
 	uint32_t hash[5];
@@ -542,6 +544,10 @@
 void md5_hash(const void *data, size_t length, md5_ctx_t *ctx);
 void *md5_end(void *resbuf, md5_ctx_t *ctx);
 
+unsigned char *hash_bin_to_hex(unsigned char *hash_value, unsigned char hash_length);
+int hash_fd(int fd, hash_algo_t hash_algo, uint8_t *hash_value);
+uint8_t *hash_file(const char *filename, hash_algo_t hash_algo);
+
 extern uint32_t *bb_crc32_filltable (int endian);
 
 #ifndef RB_POWER_OFF
diff -ruN busybox-1.2.0-orig/libbb/hash.c busybox-1.2.0-libbb_hash/libbb/hash.c
--- busybox-1.2.0-orig/libbb/hash.c	1970-01-01 01:00:00.000000000 +0100
+++ busybox-1.2.0-libbb_hash/libbb/hash.c	2006-07-22 17:07:34.000000000 +0200
@@ -0,0 +1,100 @@
+/*
+ *  Copyright (C) 2003 Glenn L. McGrath
+ *  Copyright (C) 2003-2004 Erik Andersen
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "busybox.h"
+
+unsigned char *hash_bin_to_hex(unsigned char *hash_value, unsigned char hash_length)
+{
+	int x, len, max;
+	unsigned char *hex_value;
+
+	max = (hash_length * 2) + 2;
+	hex_value = xmalloc(max);
+	for (x = len = 0; x < hash_length; x++) {
+		len += snprintf((char*)(hex_value + len), max - len, "%02x", hash_value[x]);
+	}
+	return (hex_value);
+}
+
+int hash_fd(int fd, hash_algo_t hash_algo, uint8_t *hash_value)
+{
+	int count, result = 0;
+	union _ctx_ {
+		sha1_ctx_t sha1;
+		md5_ctx_t md5;
+	} context;
+	RESERVE_CONFIG_UBUFFER(in_buf, 4096);
+	void (*update)(const void*, size_t, void*) = NULL;
+	void (*final)(void*, void*) = NULL;
+	
+	// figure specific hash algorithims
+	if (hash_algo==HASH_MD5) {
+		md5_begin(&context.md5);
+		update = (void (*)(const void*, size_t, void*))md5_hash;
+		final = (void (*)(void*, void*))md5_end;
+	} else if (hash_algo==HASH_SHA1) {
+		sha1_begin(&context.sha1);
+		update = (void (*)(const void*, size_t, void*))sha1_hash;
+		final = (void (*)(void*, void*))sha1_end;
+	}
+
+
+	while (0 < (count = read(fd, in_buf, sizeof in_buf))) {
+		update(in_buf, count, &context);
+		result += count;
+	}
+
+	if (count == 0) {
+		final(hash_value, &context);
+	}
+	
+	RELEASE_CONFIG_BUFFER(in_buf);
+	
+	return result;
+}
+
+uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
+{
+	int src_fd, hash_len;
+	RESERVE_CONFIG_UBUFFER(hash_buf, 20);
+	uint8_t *hash_value = NULL;
+	
+	if (ENABLE_MD5SUM && hash_algo==HASH_MD5) {
+		hash_len = 16;
+	} else if (ENABLE_SHA1SUM && hash_algo==HASH_SHA1) {
+		hash_len = 20;
+	} else {
+		bb_error_msg_and_die("algotithm not supported");
+	}
+
+	if (strcmp(filename, "-") == 0) {
+		src_fd = STDIN_FILENO;
+	} else if (0 > (src_fd = open(filename, O_RDONLY))) {
+		bb_perror_msg("%s", filename);
+		return NULL;
+	}
+
+	if (hash_fd(src_fd, hash_algo, hash_buf) > 0) {
+		hash_value = hash_bin_to_hex(hash_buf, hash_len);
+	}
+	
+	if (src_fd != STDIN_FILENO) {
+		close(src_fd);
+	}
+	
+	RELEASE_CONFIG_BUFFER(hash_buf);
+
+	return hash_value;
+}
diff -ruN busybox-1.2.0-orig/libbb/Makefile.in busybox-1.2.0-libbb_hash/libbb/Makefile.in
--- busybox-1.2.0-orig/libbb/Makefile.in	2006-07-01 00:42:08.000000000 +0200
+++ busybox-1.2.0-libbb_hash/libbb/Makefile.in	2006-07-22 16:51:47.000000000 +0200
@@ -11,6 +11,7 @@
 
 LIBBB-n:=
 LIBBB-y:= \
+	hash.c \
 	bb_asprintf.c ask_confirmation.c change_identity.c chomp.c \
 	compare_string_array.c concat_path_file.c copy_file.c copyfd.c \
 	crc32.c create_icmp_socket.c create_icmp6_socket.c \
