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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
#include "apr_arch_file_io.h"
#include "apr_file_io.h"
#include <errno.h>
#include <string.h>
static apr_status_t setptr(apr_file_t *thefile, apr_off_t pos )
{
apr_off_t newbufpos;
apr_status_t rv;
DWORD rc;
if (thefile->direction == 1) {
/* XXX: flush here is not mutex protected */
rv = apr_file_flush(thefile);
if (rv != APR_SUCCESS)
return rv;
thefile->bufpos = thefile->dataRead = 0;
thefile->direction = 0;
}
/* We may be truncating to size here.
* XXX: testing an 'unsigned' as >= 0 below indicates a bug
*/
newbufpos = pos - (thefile->filePtr - thefile->dataRead);
if (newbufpos >= 0 && newbufpos <= (apr_off_t)thefile->dataRead) {
thefile->bufpos = (apr_size_t)newbufpos;
rv = APR_SUCCESS;
} else {
DWORD offlo = (DWORD)pos;
LONG offhi = (LONG)(pos >> 32);
rc = SetFilePointer(thefile->filehand, offlo, &offhi, FILE_BEGIN);
if (rc == (DWORD)-1)
/* A legal value, perhaps? MSDN implies prior SetLastError isn't
* needed, googling for SetLastError SetFilePointer seems
* to confirm this. INVALID_SET_FILE_POINTER is too recently
* added for us to rely on it as a constant.
*/
rv = apr_get_os_error();
else
rv = APR_SUCCESS;
if (rv == APR_SUCCESS) {
rv = APR_SUCCESS;
thefile->eof_hit = 0;
thefile->bufpos = thefile->dataRead = 0;
thefile->filePtr = pos;
}
}
return rv;
}
APR_DECLARE(apr_status_t) apr_file_seek(apr_file_t *thefile, apr_seek_where_t where, apr_off_t *offset)
{
apr_finfo_t finfo;
apr_status_t rc = APR_SUCCESS;
thefile->eof_hit = 0;
if (thefile->buffered) {
switch (where) {
case APR_SET:
rc = setptr(thefile, *offset);
break;
case APR_CUR:
rc = setptr(thefile, thefile->filePtr - thefile->dataRead
+ thefile->bufpos + *offset);
break;
case APR_END:
rc = apr_file_info_get(&finfo, APR_FINFO_SIZE, thefile);
if (rc == APR_SUCCESS)
rc = setptr(thefile, finfo.size + *offset);
break;
default:
return APR_EINVAL;
}
*offset = thefile->filePtr - thefile->dataRead + thefile->bufpos;
return rc;
}
/* A file opened with APR_FOPEN_XTHREAD has been opened for overlapped i/o.
* APR must explicitly track the file pointer in this case.
*/
else if (thefile->pOverlapped || thefile->flags & APR_FOPEN_XTHREAD) {
switch(where) {
case APR_SET:
thefile->filePtr = *offset;
break;
case APR_CUR:
thefile->filePtr += *offset;
break;
case APR_END:
rc = apr_file_info_get(&finfo, APR_FINFO_SIZE, thefile);
if (rc == APR_SUCCESS && finfo.size + *offset >= 0)
thefile->filePtr = finfo.size + *offset;
break;
default:
return APR_EINVAL;
}
*offset = thefile->filePtr;
return rc;
}
else {
DWORD howmove;
DWORD offlo = (DWORD)*offset;
DWORD offhi = (DWORD)(*offset >> 32);
switch(where) {
case APR_SET:
howmove = FILE_BEGIN; break;
case APR_CUR:
howmove = FILE_CURRENT; break;
case APR_END:
howmove = FILE_END; break;
default:
return APR_EINVAL;
}
offlo = SetFilePointer(thefile->filehand, (LONG)offlo,
(LONG*)&offhi, howmove);
if (offlo == 0xFFFFFFFF)
rc = apr_get_os_error();
else
rc = APR_SUCCESS;
/* Since we can land at 0xffffffff we will measure our APR_SUCCESS */
if (rc == APR_SUCCESS)
*offset = ((apr_off_t)offhi << 32) | offlo;
return rc;
}
}
APR_DECLARE(apr_status_t) apr_file_trunc(apr_file_t *thefile, apr_off_t offset)
{
apr_status_t rv;
DWORD offlo = (DWORD)offset;
LONG offhi = (LONG)(offset >> 32);
DWORD rc;
if (thefile->buffered) {
if (thefile->direction == 1) {
/* Figure out what needs to be flushed. Don't flush the part
* of the write buffer that will get truncated anyway.
*/
if (offset < thefile->filePtr) {
thefile->bufpos = 0;
}
else if (offset < thefile->filePtr + (apr_off_t)thefile->bufpos) {
thefile->bufpos = (apr_size_t)(offset - thefile->filePtr);
}
if (thefile->bufpos != 0) {
rv = apr_file_flush(thefile);
if (rv != APR_SUCCESS)
return rv;
}
}
else if (thefile->direction == 0) {
/* Discard the read buffer, as we are about to reposition
* ourselves to the end of file.
*/
thefile->bufpos = 0;
thefile->dataRead = 0;
}
}
rc = SetFilePointer(thefile->filehand, offlo, &offhi, FILE_BEGIN);
if (rc == 0xFFFFFFFF)
if ((rv = apr_get_os_error()) != APR_SUCCESS)
return rv;
thefile->filePtr = offset;
/* Don't report EOF until the next read. */
thefile->eof_hit = 0;
if (!SetEndOfFile(thefile->filehand))
return apr_get_os_error();
return APR_SUCCESS;
}
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