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Add device_get_blocksize(), and adjust offset using blocksize instead of << 11

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This commit is contained in:
Laurent Vivier 2007-10-10 16:46:03 +00:00
parent 22d6bc63a9
commit 912c63ad48
1 changed files with 11 additions and 6 deletions
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17
tools/device.c
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@ -16,14 +16,19 @@ int device_sector_size = 2048;
#define BLOCKS(X) (((X)/device_sector_size)+(((X)%device_sector_size)?1:0))
int device_get_blocksize(void *data)
{
return device_sector_size;
}
int device_read_sector(void *data,off_t offset, void* buffer, size_t size)
{
int fd = (int)data;
int ret;
lseek(fd, offset << 11, SEEK_SET);
ret = read(fd, buffer, BLOCKS(size) << 11);
if (ret != BLOCKS(size) << 11)
lseek(fd, offset * device_sector_size, SEEK_SET);
ret = read(fd, buffer, BLOCKS(size) * device_sector_size);
if (ret != BLOCKS(size) * device_sector_size)
return -1;
return 0;
}
@ -33,9 +38,9 @@ int device_write_sector(void *data,off_t offset, void* buffer, size_t size)
int fd = (int)data;
int ret;
lseek(fd, offset << 11, SEEK_SET);
ret = write(fd, buffer, BLOCKS(size) << 11);
if (ret != BLOCKS(size) << 11)
lseek(fd, offset * device_sector_size, SEEK_SET);
ret = write(fd, buffer, BLOCKS(size) * device_sector_size);
if (ret != BLOCKS(size) * device_sector_size)
return -1;
return 0;
}