/*
* NAME: hfs->read()
* DESCRIPTION: read from an open file
*/
unsigned long hfs_read(hfsfile *file, void *buf, unsigned long len)
{
unsigned long *lglen, count;
byte *ptr = buf;
f_getptrs(file, NULL, &lglen, NULL);
if (file->pos + len > *lglen)
len = *lglen - file->pos;
count = len;
while (count)
{
unsigned long bnum, offs, chunk;
bnum = file->pos >> HFS_BLOCKSZ_BITS;
offs = file->pos & (HFS_BLOCKSZ - 1);
chunk = HFS_BLOCKSZ - offs;
if (chunk > count)
chunk = count;
if (offs == 0 && chunk == HFS_BLOCKSZ)
{
if (f_getblock(file, bnum, (block *) ptr) == -1)
goto fail;
}
else
{
block b;
if (f_getblock(file, bnum, &b) == -1)
goto fail;
memcpy(ptr, b + offs, chunk);
}
ptr += chunk;
file->pos += chunk;
count -= chunk;
}
return len;
fail:
return -1;
}
/*
* NAME: hfs->read()
* DESCRIPTION: read from an open file
*/
long hfs_read(hfsfile *file, void *buf, unsigned long len)
{
unsigned long *lglen, count;
unsigned char *ptr = buf;
f_getptrs(file, &lglen, 0, 0);
if (file->pos + len > *lglen)
len = *lglen - file->pos;
count = len;
while (count)
{
block b;
unsigned long bnum, offs, chunk;
bnum = file->pos / HFS_BLOCKSZ;
offs = file->pos % HFS_BLOCKSZ;
chunk = HFS_BLOCKSZ - offs;
if (chunk > count)
chunk = count;
if (f_getblock(file, bnum, &b) < 0)
return -1;
memcpy(ptr, b + offs, chunk);
ptr += chunk;
file->pos += chunk;
count -= chunk;
}
return len;
}
/*
* NAME: hfs->write()
* DESCRIPTION: write to an open file
*/
unsigned long hfs_write(hfsfile *file, const void *buf, unsigned long len)
{
unsigned long *lglen, *pylen, count;
const byte *ptr = buf;
if (file->vol->flags & HFS_VOL_READONLY)
ERROR(EROFS, 0);
f_getptrs(file, 0, &lglen, &pylen);
count = len;
/* set flag to update (at least) the modification time */
if (count)
{
file->cat.u.fil.filMdDat = d_mtime(time(0));
file->flags |= HFS_FILE_UPDATE_CATREC;
}
while (count)
{
unsigned long bnum, offs, chunk;
bnum = file->pos >> HFS_BLOCKSZ_BITS;
offs = file->pos & (HFS_BLOCKSZ - 1);
chunk = HFS_BLOCKSZ - offs;
if (chunk > count)
chunk = count;
if (file->pos + chunk > *pylen)
{
if (bt_space(&file->vol->ext, 1) == -1 ||
f_alloc(file) == -1)
goto fail;
}
if (offs == 0 && chunk == HFS_BLOCKSZ)
{
if (f_putblock(file, bnum, (block *) ptr) == -1)
goto fail;
}
else
{
block b;
if (f_getblock(file, bnum, &b) == -1)
goto fail;
memcpy(b + offs, ptr, chunk);
if (f_putblock(file, bnum, &b) == -1)
goto fail;
}
ptr += chunk;
file->pos += chunk;
count -= chunk;
if (file->pos > *lglen)
*lglen = file->pos;
}
return len;
fail:
return -1;
}
/*
* NAME: hfs->write()
* DESCRIPTION: write to an open file
*/
long hfs_write(hfsfile *file, void *buf, unsigned long len)
{
unsigned long *lglen, *pylen, count;
unsigned char *ptr = buf;
if (file->vol->flags & HFS_READONLY)
{
ERROR(EROFS, 0);
return -1;
}
f_getptrs(file, &lglen, &pylen, 0);
count = len;
/* set flag to update (at least) the modification time */
if (count)
{
file->cat.u.fil.filMdDat = d_tomtime(/*time*/(0));
file->flags |= HFS_UPDATE_CATREC;
}
while (count)
{
block b;
unsigned long bnum, offs, chunk;
bnum = file->pos / HFS_BLOCKSZ;
offs = file->pos % HFS_BLOCKSZ;
chunk = HFS_BLOCKSZ - offs;
if (chunk > count)
chunk = count;
if (file->pos + chunk > *pylen)
{
if (bt_space(&file->vol->ext, 1) < 0 ||
f_alloc(file) < 0)
return -1;
}
if (offs > 0 || chunk < HFS_BLOCKSZ)
{
if (f_getblock(file, bnum, &b) < 0)
return -1;
}
memcpy(b + offs, ptr, chunk);
ptr += chunk;
if (f_putblock(file, bnum, &b) < 0)
return -1;
file->pos += chunk;
count -= chunk;
if (file->pos > *lglen)
*lglen = file->pos;
}
return len;
}
