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/*===========================================================================
*
* PUBLIC DOMAIN NOTICE
* National Center for Biotechnology Information
*
* This software/database is a "United States Government Work" under the
* terms of the United States Copyright Act. It was written as part of
* the author's official duties as a United States Government employee and
* thus cannot be copyrighted. This software/database is freely available
* to the public for use. The National Library of Medicine and the U.S.
* Government have not placed any restriction on its use or reproduction.
*
* Although all reasonable efforts have been taken to ensure the accuracy
* and reliability of the software and data, the NLM and the U.S.
* Government do not and cannot warrant the performance or results that
* may be obtained by using this software or data. The NLM and the U.S.
* Government disclaim all warranties, express or implied, including
* warranties of performance, merchantability or fitness for any particular
* purpose.
*
* Please cite the author in any work or product based on this material.
*
* ===========================================================================
*
*/
#include "KFileHelper.h"
#include <string.h>
rc_t BufferedKFileGets(KDataBuffer *buf, unsigned offset, unsigned *nread, BufferedKFile *strm) {
unsigned i;
unsigned n;
int ch;
rc_t rc;
do {
if (strm->cur != strm->inbuf) {
ch = strm->buf[strm->cur];
if (ch == '\r' || ch == '\n')
++strm->cur;
else
break;
}
else {
size_t numread;
rc = KFileRead(strm->kfp, strm->fpos, strm->buf, sizeof(strm->buf), &numread);
if (rc) return -1;
strm->cur = 0;
strm->inbuf = numread;
strm->fpos += numread;
if (numread == 0) {
*nread = 0;
return 0;
}
}
} while (1);
for (n = 0, i = offset; ; ++i, ++n) {
if (strm->cur != strm->inbuf) {
ch = strm->buf[strm->cur++];
}
else {
size_t numread;
rc = KFileRead(strm->kfp, strm->fpos, strm->buf, sizeof(strm->buf), &numread);
if (rc) return rc;
strm->cur = 0;
strm->inbuf = numread;
if (numread == 0) break;
strm->fpos += numread;
ch = strm->buf[strm->cur++];
}
if (ch == '\r' || ch == '\n') break;
if (i >= buf->elem_count) {
rc = KDataBufferResize(buf, buf->elem_count ? buf->elem_count * 2 : 1024);
if (rc) return rc;
}
((char *)buf->base)[i] = ch;
}
*nread = n;
return 0;
}
rc_t BufferedKFileOpen(const KDirectory *directory, BufferedKFile *rslt, const char *fileName, ...) {
va_list va;
rc_t rc;
memset(rslt, 0, sizeof(rslt) - sizeof(rslt->buf));
va_start(va, fileName);
rc = KDirectoryVOpenFileRead(directory, &rslt->kfp, fileName, va);
va_end(va);
return rc;
}
rc_t BufferedKFileClose(BufferedKFile *strm) {
return KFileRelease(strm->kfp);
}
rc_t LoadFile(KDataBuffer *dst, uint64_t *lineCount, const KDirectory *dir, const char *fileName, ...) {
BufferedKFile strm;
rc_t rc;
unsigned line = 0;
memset(&strm, 0, sizeof(strm) - sizeof(strm.buf));
{
va_list va;
va_start(va, fileName);
rc = KDirectoryVOpenFileRead(dir, &strm.kfp, fileName, va);
va_end(va);
}
if (rc == 0) {
unsigned offset = 0;
unsigned i;
while ((rc = BufferedKFileGets(dst, offset, &i, &strm)) == 0 && i) {
offset += i;
if (offset + 1 >= dst->elem_count) {
rc = KDataBufferResize(dst, offset + 1);
if (rc)
break;
}
((char *)dst->base)[offset++] = '\0';
++line;
}
BufferedKFileClose(&strm);
if (rc == 0)
rc = KDataBufferResize(dst, offset);
}
if (rc != 0) {
KDataBufferResize(dst, 0);
line = 0;
}
if (lineCount) *lineCount = line;
return rc;
}
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