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