rtxBuffer.h

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/*
 * Copyright (c) 2003-2022 Objective Systems, Inc.
 *
 * This software is furnished under a license and may be used and copied
 * only in accordance with the terms of such license and with the
 * inclusion of the above copyright notice. This software or any other
 * copies thereof may not be provided or otherwise made available to any
 * other person. No title to and ownership of the software is hereby
 * transferred.
 *
 * The information in this software is subject to change without notice
 * and should not be construed as a commitment by Objective Systems, Inc.
 *
 * PROPRIETARY NOTICE
 *
 * This software is an unpublished work subject to a confidentiality agreement
 * and is protected by copyright and trade secret law.  Unauthorized copying,
 * redistribution or other use of this work is prohibited.
 *
 * The above notice of copyright on this source code product does not indicate
 * any actual or intended publication of such source code.
 *
 *****************************************************************************/
#ifndef _RTXBUFFER_H_
#define _RTXBUFFER_H_

#include "rtxsrc/rtxContext.h"
#include "rtxsrc/rtxSList.h"

/* reserve octets to enable short backoffs */
#define MIN_STREAM_BACKOFF 0


typedef struct _OSRTBufLocDescr {
   OSSIZE numocts;
   OSSIZE offset;
} OSRTBufLocDescr;

#ifdef __cplusplus
extern "C" {
#endif


EXTERNRT int rtxCheckBuffer (OSCTXT* pctxt, size_t nbytes);

EXTERNRT int rtxCheckOutputBuffer (OSCTXT* pctxt, size_t nbytes);


EXTERNRT OSBOOL rtxIsOutputBufferFlushable(OSCTXT* pctxt);


EXTERNRT int rtxFlushOutputBuffer(OSCTXT* pctxt);


EXTERNRT int rtxExpandOutputBuffer (OSCTXT* pctxt, size_t nbytes);

EXTERNRT int rtxCheckInputBuffer (OSCTXT* pctxt, size_t nbytes);

EXTERNRT int rtxCopyAsciiText (OSCTXT* pctxt, const char* text);

EXTERNRT int rtxCopyUTF8Text (OSCTXT* pctxt, const OSUTF8CHAR* text);

EXTERNRT int rtxCopyUnicodeText (OSCTXT* pctxt, const OSUNICHAR* text);

EXTERNRT int rtxLoadInputBuffer(OSCTXT* pctxt, OSSIZE nbytes);

EXTERNRT int rtxPeekByte(OSCTXT* pctxt, OSOCTET* pbyte);

EXTERNRT int rtxPeekBytes(OSCTXT* pctxt, OSOCTET* pdata, OSSIZE bufsize,
                           OSSIZE nocts, OSSIZE* pactual);

EXTERNRT int rtxReadBytesSafe
(OSCTXT* pctxt, OSOCTET* buffer, size_t bufsize, size_t nocts);

EXTERNRT int rtxReadBytes (OSCTXT* pctxt, OSOCTET* pdata, size_t nocts);

EXTERNRT int rtxReadBytesDynamic
(OSCTXT* pctxt, OSOCTET** ppdata, size_t nocts, OSBOOL* pMemAlloc);

EXTERNRT int rtxWriteBytes
(OSCTXT* pctxt, const OSOCTET* pdata, size_t nocts);


EXTERNRT int rtxWriteIndent(OSCTXT* pctxt);

EXTERNRT void rtxIndentDecr(OSCTXT* pctxt);

EXTERNRT void rtxIndentIncr(OSCTXT* pctxt);

EXTERNRT void rtxIndentReset(OSCTXT* pctxt);


EXTERNRT size_t rtxGetIndentLevels(OSCTXT* pctxt);


EXTERNRT OSBOOL rtxCanonicalSort (OSOCTET* refPoint, OSRTSList* pList,
                                 OSBOOL normal);


#ifndef _NO_STREAM

EXTERNRT int rtxEncCanonicalSort (OSCTXT* pctxt,
                                   OSCTXT* pMemCtxt,
                                   OSRTSList* pList);

EXTERNRT void rtxGetBufLocDescr (OSCTXT *pctxt, OSRTBufLocDescr* pDescr);

EXTERNRT void rtxAddBufLocDescr (OSCTXT *pctxt, OSRTSList* pElemList,
                                  OSRTBufLocDescr* pDescr);
#endif /* _NO_STREAM */

/* Macros */

#define OSRTPUTCHAR(pctxt,ch) rtxWriteBytes (pctxt, (OSOCTET*)&ch, 1)

#define OSRTPUTCHARREV(pctxt,ch) \
(pctxt)->buffer.data[--(pctxt)->buffer.byteIndex]=(OSOCTET)ch;

#define OSRTZTERM(pctxt) \
(pctxt)->buffer.data[(pctxt)->buffer.byteIndex]=(OSOCTET)0;

#define OSRTSAFEZTERM(pctxt) \
do { \
if (rtxCheckOutputBuffer (pctxt, 1) == 0) \
(pctxt)->buffer.data[(pctxt)->buffer.byteIndex]=(OSOCTET)0; \
else return LOG_RTERRNEW (pctxt, RTERR_BUFOVFLW); \
} while (0)

#define OSRTSAFEPUTCHAR(pctxt,ch) \
do { \
if (rtxCheckOutputBuffer (pctxt, 1) == 0) \
(pctxt)->lastChar= \
(pctxt)->buffer.data[(pctxt)->buffer.byteIndex++]=(OSOCTET)ch; \
else return LOG_RTERRNEW (pctxt, RTERR_BUFOVFLW); \
} while (0)

/* Put character into buffer and terminate buffer with null character.
   Execute return LOG_RTERRNEW if there is not room in the buffer and
   the buffer cannot be expanded to make room.
*/
#define OSRTSAFEPUTCHAR_ZTERM(pctxt,ch) \
do { \
if (rtxCheckOutputBuffer (pctxt, 2) == 0) { \
(pctxt)->lastChar= \
(pctxt)->buffer.data[(pctxt)->buffer.byteIndex++]=(OSOCTET)ch; \
(pctxt)->buffer.data[(pctxt)->buffer.byteIndex]=(OSOCTET)0; } \
else return LOG_RTERRNEW (pctxt, RTERR_BUFOVFLW); \
} while (0)


#define OSRTSAFEPUTCHAR1(pctxt,ch,stat) \
do { \
OSOCTET b = (OSOCTET)ch; \
rtxWriteBytes (pctxt, &b, 1); \
} while (0)

#if 0
#define OSRTSAFEPUTCHAR2(pctxt,ch,prealloc) \
do { \
if (rtxCheckOutputBuffer (pctxt, ((prealloc > 1)?prealloc:1)) == 0) \
(pctxt)->lastChar= \
(pctxt)->buffer.data[(pctxt)->buffer.byteIndex++]=(OSOCTET)ch; \
else return LOG_RTERRNEW (pctxt, RTERR_BUFOVFLW); \
} while (0)
#endif

#define OSRTMEMCPY(pctxt,bdata,len) \
do { \
OSCRTLSAFEMEMCPY (&(pctxt)->buffer.data[(pctxt)->buffer.byteIndex], \
      (pctxt)->buffer.size-(pctxt)->buffer.byteIndex, bdata, len); \
(pctxt)->buffer.byteIndex += len; \
(pctxt)->lastChar = (pctxt)->buffer.data[(pctxt)->buffer.byteIndex-1]; \
} while (0)

#define OSRTMEMCPYREV(pctxt,bdata,len) \
do { \
(pctxt)->buffer.byteIndex -= len; \
OSCRTLSAFEMEMCPY (&(pctxt)->buffer.data[(pctxt)->buffer.byteIndex], \
      (pctxt)->buffer.size-(pctxt)->buffer.byteIndex, bdata, len); \
} while (0)

#define OSRTSAFEMEMCPY(pctxt,bdata,len) \
do { \
if (rtxCheckOutputBuffer (pctxt, len) == 0) { \
OSCRTLMEMCPY (&(pctxt)->buffer.data[(pctxt)->buffer.byteIndex], bdata, len); \
(pctxt)->buffer.byteIndex += len; \
(pctxt)->lastChar = (pctxt)->buffer.data[(pctxt)->buffer.byteIndex-1]; } \
else return LOG_RTERRNEW (pctxt, RTERR_BUFOVFLW); \
} while (0)

#define OSRTSAFEMEMCPY1(pctxt,bdata,len,stat) \
do { \
if (rtxCheckOutputBuffer (pctxt, len) == 0) { \
OSCRTLMEMCPY (&(pctxt)->buffer.data[(pctxt)->buffer.byteIndex], bdata, len); \
(pctxt)->buffer.byteIndex += len; \
(pctxt)->lastChar = (pctxt)->buffer.data[(pctxt)->buffer.byteIndex-1]; \
stat = 0; } \
else stat = RTERR_BUFOVFLW; \
} while (0)

#define OSRTGETBUFUTF8LEN(pctxt) \
rtxCalcUTF8Len (OSRTBUFPTR (pctxt), OSRTBUFSIZE (pctxt))

#define OSRTCHKBUFUTF8LEN(pctxt,lower,upper,stat) \
do { size_t nchars = OSRTGETBUFUTF8LEN (pctxt); \
stat = (nchars >= lower && nchars <= upper) ? 0 : RTERR_CONSVIO; } while(0)

#define OSRTENDOFBUF(pctxt) ((pctxt)->buffer.byteIndex >= (pctxt)->buffer.size)

#define OSRTByteAlign(pctxt)          \
if ((pctxt)->buffer.bitOffset != 8) { \
   (pctxt)->buffer.byteIndex++;       \
   (pctxt)->buffer.bitOffset = 8; }   \


#ifdef __cplusplus
}
#endif

#endif