Add bindiff for tests

src/test/CMakeLists.txt

@@ -12,6 +12,11 @@ target_link_libraries(stub_bench tcmalloc_minimal)
 add_executable(osd_test osd_test.cpp ../util/rw_blocking.cpp ../util/addr_util.cpp)
 target_link_libraries(osd_test tcmalloc_minimal)
 
+# bindiff
+add_executable(bindiff
+	bindiff.c
+)
+
 # stub_uring_osd
 add_executable(stub_uring_osd
 	stub_uring_osd.cpp

src/test/bindiff.c

@@ -0,0 +1,177 @@
+// Copyright (c) Vitaliy Filippov, 2004+
+// License: VNPL-1.1 (see README.md for details)
+
+#ifndef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE
+#endif
+
+#include <string.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#define BUFSIZE 0x100000
+
+uint64_t filelength(int fd)
+{
+    struct stat st;
+    if (fstat(fd, &st) < 0)
+    {
+        fprintf(stderr, "fstat failed: %s\n", strerror(errno));
+        return 0;
+    }
+    if (st.st_size < 0)
+    {
+        return 0;
+    }
+    return (uint64_t)st.st_size;
+}
+
+size_t read_blocking(int fd, void *read_buf, size_t remaining)
+{
+    size_t done = 0;
+    while (done < remaining)
+    {
+        ssize_t r = read(fd, read_buf, remaining-done);
+        if (r <= 0)
+        {
+            if (!errno)
+            {
+                // EOF
+                return done;
+            }
+            else if (errno != EINTR && errno != EAGAIN && errno != EPIPE)
+            {
+                perror("read");
+                exit(1);
+            }
+            continue;
+        }
+        done += (size_t)r;
+        read_buf = (uint8_t*)read_buf + r;
+    }
+    return done;
+}
+
+size_t write_blocking(int fd, void *write_buf, size_t remaining)
+{
+    size_t done = 0;
+    while (done < remaining)
+    {
+        ssize_t r = write(fd, write_buf, remaining-done);
+        if (r < 0)
+        {
+            if (errno != EINTR && errno != EAGAIN && errno != EPIPE)
+            {
+                perror("write");
+                exit(1);
+            }
+            continue;
+        }
+        done += (size_t)r;
+        write_buf = (uint8_t*)write_buf + r;
+    }
+    return done;
+}
+
+int main(int narg, char *args[])
+{
+    int fd1 = -1, fd2 = -1;
+    uint8_t *buf1 = NULL, *buf2 = NULL;
+    uint64_t addr = 0, l1 = 0, l2 = 0, l = 0, diffl = 0;
+    size_t buf1_len = 0, buf2_len = 0, i = 0, j = 0, dl = 0;
+    int argoff = 0;
+    int nosource = 0;
+    fprintf(stderr, "VMX HexDiff v2.1\nLicense: GPLv3.0+, (c) 2005+, Vitaliy Filippov\n");
+    argoff = 1;
+    if (narg > argoff && strcmp(args[argoff], "-n") == 0)
+    {
+        nosource = 1;
+        argoff++;
+    }
+    if (narg < argoff+2)
+    {
+        fprintf(stderr, "USAGE: bindiff [-n] <file1> <file2>\n"
+            "This will create hex patch file1->file2 and write it to stdout.\n"
+            "[-n] = do not write file1 data in patch, only file2.\n");
+        return -1;
+    }
+    fd1 = open(args[argoff], O_RDONLY);
+    if (fd1 < 0)
+    {
+        fprintf(stderr, "Couldn't open %s: %s\n", args[argoff], strerror(errno));
+        return -1;
+    }
+    fd2 = open(args[argoff+1], O_RDONLY);
+    if (fd2 < 0)
+    {
+        fprintf(stderr, "Couldn't open %s: %s\n", args[argoff+1], strerror(errno));
+        close(fd1);
+        return -1;
+    }
+    l1 = filelength(fd1);
+    l2 = filelength(fd2);
+    if (l1 < l2)
+        l = l1;
+    else
+        l = l2;
+    addr = diffl = 0;
+    buf1 = malloc(BUFSIZE+1);
+    buf2 = malloc(BUFSIZE+1);
+    while ((buf1_len = read_blocking(fd1, buf1, BUFSIZE)) > 0 && (buf2_len = read_blocking(fd2, buf2, BUFSIZE)) > 0)
+    {
+        buf1[buf1_len] = buf2[buf2_len] = 0;
+        for (dl = 0, i = 0; i <= buf1_len && i <= buf2_len; i++, addr++)
+        {
+            if (buf1[i] != buf2[i])
+            {
+                dl++;
+            }
+            else if (dl)
+            {
+                printf("%08jX: ", addr-dl);
+                if (!nosource)
+                {
+                    for (j = i-dl; j < i; j++)
+                        printf("%02X", buf1[j]);
+                    printf(" ");
+                }
+                for (j = i-dl; j < i; j++)
+                    printf("%02X", buf2[j]);
+                printf("\n");
+                diffl += dl;
+                dl = 0;
+            }
+        }
+        addr--;
+    }
+    if (l1 < l2)
+    {
+        printf("%08zX: ", i);
+        while ((buf2_len = read_blocking(fd2, buf2, BUFSIZE)) > 0)
+        {
+            for (j = 0; j < buf2_len; j++, i++)
+                printf("%02X", buf2[j]);
+        }
+        printf("\n");
+    }
+    else if (l1 > l2)
+    {
+        printf("SIZE %08zX\n", l2);
+    }
+    if (diffl != 0 || l1 != l2)
+    {
+        fprintf(stderr, "Difference in %zu of %zu common bytes\n", diffl, l);
+        if (l1 != l2)
+            fprintf(stderr, "Length difference!\nFile \"%s\": %zu\nFile \"%s\": %zu\n", args [1], l1, args [2], l2);
+    }
+    else
+    {
+        fprintf(stderr, "Files are equal\n");
+    }
+    return 0;
+}

src/util/rw_blocking.cpp

@@ -10,7 +10,7 @@
 
 #include "rw_blocking.h"
 
-int read_blocking(int fd, void *read_buf, size_t remaining)
+size_t read_blocking(int fd, void *read_buf, size_t remaining)
 {
     size_t done = 0;
     while (done < remaining)
@@ -30,13 +30,13 @@ int read_blocking(int fd, void *read_buf, size_t remaining)
             }
             continue;
         }
-        done += r;
+        done += (size_t)r;
         read_buf = (uint8_t*)read_buf + r;
     }
     return done;
 }
 
-int write_blocking(int fd, void *write_buf, size_t remaining)
+size_t write_blocking(int fd, void *write_buf, size_t remaining)
 {
     size_t done = 0;
     while (done < remaining)
@@ -51,7 +51,7 @@ int write_blocking(int fd, void *write_buf, size_t remaining)
             }
             continue;
         }
-        done += r;
+        done += (size_t)r;
         write_buf = (uint8_t*)write_buf + r;
     }
     return done;

src/util/rw_blocking.h

@@ -6,8 +6,8 @@
 #include <unistd.h>
 #include <sys/uio.h>
 
-int read_blocking(int fd, void *read_buf, size_t remaining);
-int write_blocking(int fd, void *write_buf, size_t remaining);
+size_t read_blocking(int fd, void *read_buf, size_t remaining);
+size_t write_blocking(int fd, void *write_buf, size_t remaining);
 int readv_blocking(int fd, iovec *iov, int iovcnt);
 int writev_blocking(int fd, iovec *iov, int iovcnt);
 int sendv_blocking(int fd, iovec *iov, int iovcnt, int flags);

tests/test_heal.sh

@@ -60,6 +60,7 @@ qemu-img convert -S 4096 -p \
     -O raw ./testdata/bin/read.bin
 
 if ! diff -q ./testdata/bin/read.bin ./testdata/bin/mirror.bin; then
+    build/src/test/bindiff ./testdata/bin/read.bin ./testdata/bin/mirror.bin
     format_error Data lost during self-heal
 fi