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/* 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 <unistd.h>
#include <sys/stat.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;
}
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