use size_t when we refer to memory sizes

ccache.h

@@ -56,7 +56,7 @@ int hash_fd(struct mdfour *md, int fd);
 int hash_file(struct mdfour *md, const char *fname);
 char *hash_result(struct mdfour *md);
 void hash_result_as_bytes(struct mdfour *md, unsigned char *out);
-void hash_buffer(struct mdfour *md, const char *s, int len);
+void hash_buffer(struct mdfour *md, const char *s, size_t len);
 
 void cc_log(const char *format, ...) ATTR_FORMAT(printf, 1, 2);
 void fatal(const char *format, ...) ATTR_FORMAT(printf, 1, 2);

hash.c

@@ -25,7 +25,7 @@
 #include <string.h>
 #include <unistd.h>
 
-void hash_buffer(struct mdfour *md, const char *s, int len)
+void hash_buffer(struct mdfour *md, const char *s, size_t len)
 {
 	mdfour_update(md, (unsigned char *)s, len);
 }
@@ -51,7 +51,7 @@ void hash_int(struct mdfour *md, int x)
 int hash_fd(struct mdfour *md, int fd)
 {
 	char buf[1024];
-	int n;
+	size_t n;
 
 	while ((n = read(fd, buf, sizeof(buf))) > 0) {
 		hash_buffer(md, buf, n);

mdfour.c

@@ -110,7 +110,7 @@ void mdfour_begin(struct mdfour *md)
 }
 
 
-static void mdfour_tail(const unsigned char *in, int n)
+static void mdfour_tail(const unsigned char *in, size_t n)
 {
 	unsigned char buf[128];
 	uint32_t M[16];
@@ -137,7 +137,7 @@ static void mdfour_tail(const unsigned char *in, int n)
 	}
 }
 
-void mdfour_update(struct mdfour *md, const unsigned char *in, int n)
+void mdfour_update(struct mdfour *md, const unsigned char *in, size_t n)
 {
 	uint32_t M[16];
 
@@ -149,7 +149,7 @@ void mdfour_update(struct mdfour *md, const unsigned char *in, int n)
 	}
 
 	if (md->tail_len) {
-		int len = 64 - md->tail_len;
+		size_t len = 64 - md->tail_len;
 		if (len > n) len = n;
 		memcpy(md->tail+md->tail_len, in, len);
 		md->tail_len += len;

mdfour.h

@@ -22,17 +22,18 @@
 #ifndef MDFOUR_H
 #define MDFOUR_H
 
+#include <stddef.h>
 #include <inttypes.h>
 
 struct mdfour {
 	uint32_t A, B, C, D;
-	uint32_t totalN;
+	size_t totalN;
 	unsigned char tail[64];
-	unsigned tail_len;
+	size_t tail_len;
 };
 
 void mdfour_begin(struct mdfour *md);
-void mdfour_update(struct mdfour *md, const unsigned char *in, int n);
+void mdfour_update(struct mdfour *md, const unsigned char *in, size_t n);
 void mdfour_result(struct mdfour *md, unsigned char *out);
 
 #endif

unify.c

@@ -102,7 +102,7 @@ static void build_table(void)
 static void pushchar(struct mdfour *hash, unsigned char c)
 {
 	static unsigned char buf[64];
-	static int len;
+	static size_t len;
 
 	if (c == 0) {
 		if (len > 0) {