Rename C source file to C++ source files

1 files changed, 213 insertions, 0 deletions

diff --git a/src/resources.cpp b/src/resources.cpp
new file mode 100644
index 0000000..0829c7c
--- /dev/null
+++ b/src/resources.cpp
@@ -0,0 +1,213 @@
+/* Copyright 2019 Ján Sučan <jan@jansucan.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "resources.h"
+
+#include "print.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void
+resources_init_for_backup(resources_backup_t *const res)
+{
+    res->in_file = NULL;
+    res->ref_file = NULL;
+    res->out_file = NULL;
+
+    res->in_buffer = NULL;
+    res->ref_buffer = NULL;
+    res->out_buffer = NULL;
+}
+
+static int
+resources_allocate_for_backup(const options_backup_t *const opts,
+                              resources_backup_t *const res)
+{
+    if ((res->in_file = fopen(opts->in_file_path, "r")) == NULL) {
+        print_error("cannot open input file: %s", strerror(errno));
+        return 1;
+    }
+
+    if ((res->ref_file = fopen(opts->ref_file_path, "r")) == NULL) {
+        print_error("cannot open reference file: %s", strerror(errno));
+        return 1;
+    }
+
+    /* When backing up, the output file is truncated to hold the
+     * new data
+     */
+    if ((res->out_file = fopen(opts->out_file_path, "w+")) == NULL) {
+        print_error("cannot open output file: %s", strerror(errno));
+        return 1;
+    }
+
+    /* The output buffer contains also the offsets */
+    res->out_buffer_size =
+        ((opts->buffer_size / opts->sector_size) * sizeof(uint64_t)) +
+        opts->buffer_size;
+
+    // TODO: separate function
+    if ((res->in_buffer = (char *)malloc(opts->buffer_size)) == NULL) {
+        print_error("cannot allocate buffer for input file data");
+        return 1;
+    } else if ((res->ref_buffer = (char *)malloc(opts->buffer_size)) == NULL) {
+        print_error("cannot allocate buffer for reference file data");
+        return 1;
+    } else if ((res->out_buffer = (char *)malloc(res->out_buffer_size)) ==
+               NULL) {
+        print_error("cannot allocate buffer for output file data");
+        return 1;
+    }
+
+    return 0;
+}
+
+static void
+resources_init_for_restore(resources_restore_t *const res)
+{
+    res->in_file = NULL;
+    res->out_file = NULL;
+
+    res->in_buffer = NULL;
+    res->out_buffer = NULL;
+}
+
+static int
+resources_allocate_for_restore(const options_restore_t *const opts,
+                               resources_restore_t *const res)
+{
+    if ((res->in_file = fopen(opts->in_file_path, "r")) == NULL) {
+        print_error("cannot open input file: %s", strerror(errno));
+        return 1;
+    }
+
+    /* When restoring, the file must be opened for writing and not
+     * truncated
+     */
+    if ((res->out_file = fopen(opts->out_file_path, "r+")) == NULL) {
+        print_error("cannot open output file: %s", strerror(errno));
+        return 1;
+    }
+
+    /* Allocate the buffer for data from the input file */
+    /* The input buffer contains also the offsets */
+    res->in_sector_size = sizeof(uint64_t) + opts->sector_size;
+    const size_t in_buffer_sector_count =
+        opts->buffer_size / res->in_sector_size;
+    res->in_buffer_size = in_buffer_sector_count * res->in_sector_size;
+
+    if ((res->in_buffer = (char *)malloc(res->in_buffer_size)) == NULL) {
+        print_error("cannot allocate buffer for input file data");
+        return 1;
+    }
+
+    return 0;
+}
+
+static void
+resources_close_file(FILE **const file)
+{
+    if (*file != NULL) {
+        fclose(*file);
+        *file = NULL;
+    }
+}
+
+static void
+resources_close_buffer(char **const buffer)
+{
+    if (*buffer != NULL) {
+        free(*buffer);
+        *buffer = NULL;
+    }
+}
+
+static void
+resources_free_backup(resources_backup_t *const res)
+{
+    resources_close_file(&(res->in_file));
+    resources_close_file(&(res->ref_file));
+    resources_close_file(&(res->out_file));
+
+    resources_close_buffer(&(res->in_buffer));
+    resources_close_buffer(&(res->ref_buffer));
+    resources_close_buffer(&(res->out_buffer));
+}
+
+static void
+resources_free_restore(resources_restore_t *const res)
+{
+    resources_close_file(&(res->in_file));
+    resources_close_file(&(res->out_file));
+
+    resources_close_buffer(&(res->in_buffer));
+    resources_close_buffer(&(res->out_buffer));
+}
+
+int
+resources_allocate(const options_t *const opts, resources_t *const res)
+{
+    res->operation_id = opts->operation_id;
+
+    if (res->operation_id == OPERATION_ID_BACKUP) {
+        resources_init_for_backup(&(res->res.backup));
+        return resources_allocate_for_backup(&(opts->op.backup),
+                                             &(res->res.backup));
+    } else if (res->operation_id == OPERATION_ID_RESTORE) {
+        resources_init_for_restore(&(res->res.restore));
+        return resources_allocate_for_restore(&(opts->op.restore),
+                                              &(res->res.restore));
+    }
+
+    return 0;
+}
+
+const resources_backup_t *
+resources_get_for_backup(const resources_t *const res)
+{
+    return &(res->res.backup);
+}
+
+const resources_restore_t *
+resources_get_for_restore(const resources_t *const res)
+{
+    return &(res->res.restore);
+}
+
+void
+resources_free(resources_t *const res)
+{
+    if (res->operation_id == OPERATION_ID_BACKUP) {
+        resources_free_backup(&(res->res.backup));
+    } else if (res->operation_id == OPERATION_ID_RESTORE) {
+        resources_free_restore(&(res->res.restore));
+    }
+
+    res->operation_id = OPERATION_ID_UNKNOWN;
+}