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/******************************************************************************
* $Id: gpb.h 25370 2012-12-27 21:20:05Z rouault $
*
* Project: OpenGIS Simple Features Reference Implementation
* Author: Even Rouault, <even dot rouault at mines dash paris dot org>
* Purpose: Google Protocol Buffer generic handling functions
*
******************************************************************************
* Copyright (c) 2012, Even Rouault, <even dot rouault at mines dash paris dot org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifndef _GPB_H_INCLUDED
#define _GPB_H_INCLUDED
#include "cpl_port.h"
#include "cpl_error.h"
#ifndef CHECK_OOB
#define CHECK_OOB 1
#endif
//#define DEBUG_GPB_ERRORS
#ifdef DEBUG_GPB_ERRORS
static void error_occured(int nLine)
{
CPLError(CE_Failure, CPLE_AppDefined, "Parsing error occured at line %d", nLine);
}
#define GOTO_END_ERROR do { error_occured(__LINE__); goto end_error; } while(0)
#else
#define GOTO_END_ERROR goto end_error
#endif
#if defined(__GNUC__)
#define CPL_NO_INLINE __attribute__ ((noinline))
#else
#define CPL_NO_INLINE
#endif
/************************************************************************/
/* Google Protocol Buffer definitions */
/************************************************************************/
#define WT_VARINT 0
#define WT_64BIT 1
#define WT_DATA 2
#define WT_STARTGROUP 3
#define WT_ENDGROUP 4
#define WT_32BIT 5
#define MAKE_KEY(nFieldNumber, nWireType) ((nFieldNumber << 3) | nWireType)
#define GET_WIRETYPE(nKey) (nKey & 0x7)
#define GET_FIELDNUMBER(nKey) (nKey >> 3)
/************************************************************************/
/* ReadVarInt32() */
/************************************************************************/
static int ReadVarInt32(GByte** ppabyData)
{
int nVal = 0;
int nShift = 0;
GByte* pabyData = *ppabyData;
while(TRUE)
{
int nByte = *pabyData;
if (!(nByte & 0x80))
{
*ppabyData = pabyData + 1;
return nVal | (nByte << nShift);
}
nVal |= (nByte & 0x7f) << nShift;
pabyData ++;
nShift += 7;
}
}
#define READ_VARINT32(pabyData, pabyDataLimit, nVal) \
{ \
nVal = ReadVarInt32(&pabyData); \
if (CHECK_OOB && pabyData > pabyDataLimit) GOTO_END_ERROR; \
}
#define READ_VARSINT32(pabyData, pabyDataLimit, nVal) \
{ \
nVal = ReadVarInt32(&pabyData); \
nVal = ((nVal & 1) == 0) ? (((unsigned int)nVal) >> 1) : -(((unsigned int)nVal) >> 1)-1; \
if (CHECK_OOB && pabyData > pabyDataLimit) GOTO_END_ERROR; \
}
/************************************************************************/
/* ReadVarUInt32() */
/************************************************************************/
static unsigned int ReadVarUInt32(GByte** ppabyData)
{
unsigned int nVal = 0;
int nShift = 0;
GByte* pabyData = *ppabyData;
while(TRUE)
{
int nByte = *pabyData;
if (!(nByte & 0x80))
{
*ppabyData = pabyData + 1;
return nVal | (nByte << nShift);
}
nVal |= (nByte & 0x7f) << nShift;
pabyData ++;
nShift += 7;
}
}
#define READ_VARUINT32(pabyData, pabyDataLimit, nVal) \
{ \
nVal = ReadVarUInt32(&pabyData); \
if (CHECK_OOB && pabyData > pabyDataLimit) GOTO_END_ERROR; \
}
#define READ_SIZE(pabyData, pabyDataLimit, nSize) \
{ \
READ_VARUINT32(pabyData, pabyDataLimit, nSize); \
if (CHECK_OOB && nSize > pabyDataLimit - pabyData) GOTO_END_ERROR; \
}
/************************************************************************/
/* ReadVarInt64() */
/************************************************************************/
static GIntBig ReadVarInt64(GByte** ppabyData)
{
GIntBig nVal = 0;
int nShift = 0;
GByte* pabyData = *ppabyData;
while(TRUE)
{
int nByte = *pabyData;
if (!(nByte & 0x80))
{
*ppabyData = pabyData + 1;
return nVal | ((GIntBig)nByte << nShift);
}
nVal |= ((GIntBig)(nByte & 0x7f)) << nShift;
pabyData ++;
nShift += 7;
}
}
#define READ_VARINT64(pabyData, pabyDataLimit, nVal) \
{ \
nVal = ReadVarInt64(&pabyData); \
if (CHECK_OOB && pabyData > pabyDataLimit) GOTO_END_ERROR; \
}
#define READ_VARSINT64(pabyData, pabyDataLimit, nVal) \
{ \
nVal = ReadVarInt64(&pabyData); \
nVal = ((nVal & 1) == 0) ? (((GUIntBig)nVal) >> 1) : -(((GUIntBig)nVal) >> 1)-1; \
if (CHECK_OOB && pabyData > pabyDataLimit) GOTO_END_ERROR; \
}
#define READ_VARSINT64_NOCHECK(pabyData, pabyDataLimit, nVal) \
{ \
nVal = ReadVarInt64(&pabyData); \
nVal = ((nVal & 1) == 0) ? (((GUIntBig)nVal) >> 1) : -(((GUIntBig)nVal) >> 1)-1; \
}
/************************************************************************/
/* SkipVarInt() */
/************************************************************************/
static void SkipVarInt(GByte** ppabyData)
{
GByte* pabyData = *ppabyData;
while(TRUE)
{
int nByte = *pabyData;
if (!(nByte & 0x80))
{
*ppabyData = pabyData + 1;
return;
}
pabyData ++;
}
}
#define SKIP_VARINT(pabyData, pabyDataLimit) \
{ \
SkipVarInt(&pabyData); \
if (CHECK_OOB && pabyData > pabyDataLimit) GOTO_END_ERROR; \
}
#define READ_FIELD_KEY(nKey) READ_VARINT32(pabyData, pabyDataLimit, nKey)
#define READ_TEXT(pabyData, pabyDataLimit, pszTxt) \
unsigned int nDataLength; \
READ_SIZE(pabyData, pabyDataLimit, nDataLength); \
pszTxt = (char*)VSIMalloc(nDataLength + 1); \
if( pszTxt == NULL ) GOTO_END_ERROR; \
memcpy(pszTxt, pabyData, nDataLength); \
pszTxt[nDataLength] = 0; \
pabyData += nDataLength;
/************************************************************************/
/* SkipUnknownField() */
/************************************************************************/
#define SKIP_UNKNOWN_FIELD_INLINE(pabyData, pabyDataLimit, verbose) \
int nWireType = GET_WIRETYPE(nKey); \
if (verbose) \
{ \
int nFieldNumber = GET_FIELDNUMBER(nKey); \
CPLDebug("PBF", "Unhandled case: nFieldNumber = %d, nWireType = %d", nFieldNumber, nWireType); \
} \
switch (nWireType) \
{ \
case WT_VARINT: \
{ \
SKIP_VARINT(pabyData, pabyDataLimit); \
break; \
} \
case WT_64BIT: \
{ \
if (CHECK_OOB && pabyDataLimit - pabyData < 8) GOTO_END_ERROR; \
pabyData += 8; \
break; \
} \
case WT_DATA: \
{ \
unsigned int nDataLength; \
READ_SIZE(pabyData, pabyDataLimit, nDataLength); \
pabyData += nDataLength; \
break; \
} \
case WT_32BIT: \
{ \
if (CHECK_OOB && pabyDataLimit - pabyData < 4) GOTO_END_ERROR; \
pabyData += 4; \
break; \
} \
default: \
GOTO_END_ERROR; \
}
static
int SkipUnknownField(int nKey, GByte* pabyData, GByte* pabyDataLimit, int verbose) CPL_NO_INLINE;
static
int SkipUnknownField(int nKey, GByte* pabyData, GByte* pabyDataLimit, int verbose)
{
GByte* pabyDataBefore = pabyData;
SKIP_UNKNOWN_FIELD_INLINE(pabyData, pabyDataLimit, verbose);
return pabyData - pabyDataBefore;
end_error:
return -1;
}
#define SKIP_UNKNOWN_FIELD(pabyData, pabyDataLimit, verbose) \
{ \
int _nOffset = SkipUnknownField(nKey, pabyData, pabyDataLimit, verbose); \
if (_nOffset < 0) \
GOTO_END_ERROR; \
pabyData += _nOffset; \
}
#endif /* _GPB_H_INCLUDED */
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