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Redesign fs_dev, raw_dev, introducing device_partition and switch_fs.

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In theory, one could mount an encrypted FAT partition itself coming from a disk image, etc.
This commit is contained in:
TuxSH
2018-05-13 19:53:55 +02:00
parent 396a646fa3
commit 4f50d412f5
18 changed files with 878 additions and 674 deletions
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58
fusee/fusee-secondary/src/device_partition.c Normal file
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#include <string.h>
#include "device_partition.h"
int device_partition_read_data(device_partition_t *devpart, void *dst, uint64_t sector, uint64_t num_sectors) {
int rc;
if (!devpart->initialized) {
rc = devpart->initializer(devpart);
if (rc != 0) {
return rc;
}
}
if (devpart->read_cipher != NULL) {
for (uint64_t i = 0; i < num_sectors; i += devpart->crypto_work_buffer_num_sectors) {
uint64_t n = (i + devpart->crypto_work_buffer_num_sectors > num_sectors) ? (num_sectors - i) : devpart->crypto_work_buffer_num_sectors;
rc = devpart->reader(devpart, devpart->crypto_work_buffer, sector + i, n);
if (rc != 0) {
return rc;
}
rc = devpart->read_cipher(devpart, sector + i, n);
if (rc != 0) {
return rc;
}
memcpy(dst + (size_t)(devpart->sector_size * i), devpart->crypto_work_buffer, (size_t)(devpart->sector_size * n));
}
return 0;
} else {
return devpart->reader(devpart, dst, sector, num_sectors);
}
}
int device_partition_write_data(device_partition_t *devpart, const void *src, uint64_t sector, uint64_t num_sectors) {
int rc;
if (!devpart->initialized) {
rc = devpart->initializer(devpart);
if (rc != 0) {
return rc;
}
}
if (devpart->read_cipher != NULL) {
for (uint64_t i = 0; i < num_sectors; i += devpart->crypto_work_buffer_num_sectors) {
uint64_t n = (i + devpart->crypto_work_buffer_num_sectors > num_sectors) ? (num_sectors - i) : devpart->crypto_work_buffer_num_sectors;
memcpy(devpart->crypto_work_buffer, src + (size_t)(devpart->sector_size * i), (size_t)(devpart->sector_size * n));
rc = devpart->write_cipher(devpart, sector + i, n);
if (rc != 0) {
return rc;
}
rc = devpart->writer(devpart, devpart->crypto_work_buffer, sector + i, n);
if (rc != 0) {
return rc;
}
}
return 0;
} else {
return devpart->writer(devpart, src, sector, num_sectors);
}
}