source: freewrt/package/busybox/patches/patch-libbb_hash_c@ c6b195c

$FreeWRT$
--- busybox-1.1.3.orig/libbb/hash.c     Thu Jan  1 00:00:00 1970
+++ busybox-1.1.3/libbb/hash.c  Sat Nov 25 19:54:19 2006
@@ -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;
+}