upload android base code part6

android/system/core/libdiskconfig/diskutils.c

@@ -0,0 +1,118 @@
+/* libs/diskconfig/diskutils.c
+ *
+ * Copyright 2008, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "diskutils"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <log/log.h>
+
+#include <diskconfig/diskconfig.h>
+
+int
+write_raw_image(const char *dst, const char *src, loff_t offset, int test)
+{
+    int dst_fd = -1;
+    int src_fd = -1;
+    uint8_t buffer[2048];
+    ssize_t nr_bytes;
+    ssize_t tmp;
+    int done = 0;
+    uint64_t total = 0;
+
+    ALOGI("Writing RAW image '%s' to '%s' (offset=%llu)", src, dst, (unsigned long long)offset);
+    if ((src_fd = open(src, O_RDONLY)) < 0) {
+        ALOGE("Could not open %s for reading (errno=%d).", src, errno);
+        goto fail;
+    }
+
+    if (!test) {
+        if ((dst_fd = open(dst, O_RDWR)) < 0) {
+            ALOGE("Could not open '%s' for read/write (errno=%d).", dst, errno);
+            goto fail;
+        }
+
+        if (lseek64(dst_fd, offset, SEEK_SET) != offset) {
+            ALOGE("Could not seek to offset %lld in %s.", (long long)offset, dst);
+            goto fail;
+        }
+    }
+
+    while (!done) {
+        if ((nr_bytes = read(src_fd, buffer, sizeof(buffer))) < 0) {
+            /* XXX: Should we not even bother with EINTR? */
+            if (errno == EINTR)
+                continue;
+            ALOGE("Error (%d) while reading from '%s'", errno, src);
+            goto fail;
+        }
+
+        if (!nr_bytes) {
+            /* we're done. */
+            done = 1;
+            break;
+        }
+
+        total += nr_bytes;
+
+        /* skip the write loop if we're testing */
+        if (test)
+            nr_bytes = 0;
+
+        while (nr_bytes > 0) {
+            if ((tmp = write(dst_fd, buffer, nr_bytes)) < 0) {
+                /* XXX: Should we not even bother with EINTR? */
+                if (errno == EINTR)
+                    continue;
+                ALOGE("Error (%d) while writing to '%s'", errno, dst);
+                goto fail;
+            }
+            if (!tmp)
+                continue;
+            nr_bytes -= tmp;
+        }
+    }
+
+    if (!done) {
+        ALOGE("Exited read/write loop without setting flag! WTF?!");
+        goto fail;
+    }
+
+    if (dst_fd >= 0)
+        fsync(dst_fd);
+
+    ALOGI("Wrote %" PRIu64 " bytes to %s @ %lld", total, dst, (long long)offset);
+
+    close(src_fd);
+    if (dst_fd >= 0)
+        close(dst_fd);
+    return 0;
+
+fail:
+    if (dst_fd >= 0)
+        close(dst_fd);
+    if (src_fd >= 0)
+        close(src_fd);
+    return 1;
+}