Merge common parts of sha1sum and md5sum, which is everything except the

algorithms.
Move algorithms to hash_fd and make them available via a common
function.

coreutils/md5_sha1_sum.c

@@ -0,0 +1,195 @@
+/*
+ *  Copyright (C) 2003 Glenn L. McGrath
+ *  Copyright (C) 2003 Erik Andersen
+ * 
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "busybox.h"
+
+
+#define FLAG_SILENT	1
+#define FLAG_CHECK	2
+#define FLAG_WARN	4
+
+/* This might be usefull 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(hex_value + len, max - len, "%02x", hash_value[x]);
+	}
+	return (hex_value);
+}
+
+static uint8_t *hash_file(const char *filename, uint8_t hash_algo)
+{
+	uint8_t *hash_value_bin;
+	uint8_t *hash_value = NULL;
+	uint8_t hash_length;
+	int src_fd;
+
+	if (strcmp(filename, "-") == 0) {
+		src_fd = fileno(stdin);
+	} else {
+		src_fd = open(filename, O_RDONLY);
+	}
+
+	if (hash_algo == HASH_MD5) {
+		hash_length = 16;
+	} else {
+		hash_length = 20;
+	}
+
+	hash_value_bin = xmalloc(hash_length);
+
+	if ((src_fd != -1) && (hash_fd(src_fd, -1, hash_algo, hash_value_bin) != -2)) {
+		hash_value = hash_bin_to_hex(hash_value_bin, hash_length);
+	} else {
+		bb_perror_msg("%s", filename);
+	}
+
+	close(src_fd);
+
+	return(hash_value);
+}
+
+/* This could become a common function for md5 as well, by using md5_stream */
+extern int hash_files(int argc, char **argv, const uint8_t hash_algo)
+{
+	uint8_t *hash_value;
+	unsigned int flags;
+	int return_value = EXIT_SUCCESS;
+
+#ifdef CONFIG_FEATURE_MD5_SHA1_SUM_CHECK
+	flags = bb_getopt_ulflags(argc, argv, "scw");
+#else
+	flags = bb_getopt_ulflags(argc, argv, "s");
+#endif
+
+#ifdef CONFIG_FEATURE_MD5_SHA1_SUM_CHECK
+	if (!(flags & FLAG_CHECK)) {
+		if (flags & FLAG_SILENT) {
+			bb_error_msg_and_die
+				("the -s option is meaningful only when verifying checksums");
+		} else if (flags & FLAG_WARN) {
+			bb_error_msg_and_die
+				("the -w option is meaningful only when verifying checksums");
+		}
+	}
+#endif
+
+	if (argc == optind) {
+		argv[argc++] = "-";
+	}
+#ifdef CONFIG_FEATURE_MD5_SHA1_SUM_CHECK
+	if (flags & FLAG_CHECK) {
+		FILE *pre_computed_stream;
+		int count_total = 0;
+		int count_failed = 0;
+		unsigned char *file_ptr = argv[optind];
+		char *line;
+
+		if (optind + 1 != argc) {
+			bb_error_msg_and_die
+				("only one argument may be specified when using -c");
+		}
+
+		if (strcmp(file_ptr, "-") == 0) {
+			pre_computed_stream = stdin;
+		} else {
+			pre_computed_stream = bb_xfopen(file_ptr, "r");
+		}
+
+		while ((line = bb_get_chomped_line_from_file(pre_computed_stream)) != NULL) {
+			char *filename_ptr;
+
+			count_total++;
+			filename_ptr = strstr(line, "  ");
+			if (filename_ptr == NULL) {
+				if (flags & FLAG_WARN) {
+					bb_error_msg("Invalid format");
+				}
+				free(line);
+				continue;
+			}
+			*filename_ptr = '\0';
+			filename_ptr += 2;
+
+			hash_value = hash_file(filename_ptr, hash_algo);
+
+			if (hash_value && (strcmp(hash_value, line) == 0)) {
+				printf("%s: OK\n", filename_ptr);
+			} else {
+				printf("%s: FAILED\n", filename_ptr);
+				count_failed++;
+			}
+			/* possible free(NULL) */
+			free(hash_value);
+			free(line);
+		}
+		if (count_failed) {
+			bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
+						 count_failed, count_total);
+		}
+		if (bb_fclose_nonstdin(pre_computed_stream) == EOF) {
+			bb_perror_msg_and_die("Couldnt close file %s", file_ptr);
+		}
+	} else
+#endif
+		while (optind < argc) {
+			unsigned char *file_ptr = argv[optind];
+
+			optind++;
+			
+			hash_value = hash_file(file_ptr, hash_algo);
+			if (hash_value == NULL) {
+				return_value++;
+			}
+			else if (!flags & FLAG_SILENT) {
+				printf("%s  %s\n", hash_value, file_ptr);
+				free(hash_value);
+			}
+		}
+
+	return (return_value);
+}
+
+#ifdef CONFIG_MD5SUM
+extern int md5sum_main(int argc, char **argv)
+{
+	return(hash_files(argc, argv, HASH_MD5));
+}
+#endif
+
+#ifdef CONFIG_SHA1SUM
+extern int sha1sum_main(int argc, char **argv)
+{
+	return(hash_files(argc, argv, HASH_SHA1));
+}
+#endif