blender-archive/source/blender/io/avi/intern/avi_endian.c

/* SPDX-License-Identifier: GPL-2.0-or-later
 * Copyright 2001-2002 NaN Holding BV. All rights reserved. */

/** \file
 * \ingroup avi
 *
 * This is external code. Streams bytes to output depending on the
 * endianness of the system.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "AVI_avi.h"
#include "avi_endian.h"
#include "avi_intern.h"

#ifdef __BIG_ENDIAN__
#  include "MEM_guardedalloc.h"
#endif

#ifdef __BIG_ENDIAN__

/* copied from BLI_endian_switch_inline.h */
static void invert(int *val)
{
  int tval = *val;
  *val = (tval >> 24) | ((tval << 8) & 0x00ff0000) | ((tval >> 8) & 0x0000ff00) | (tval << 24);
}

static void sinvert(short int *val)
{
  short tval = *val;
  *val = (tval >> 8) | (tval << 8);
}

static void Ichunk(AviChunk *chunk)
{
  invert(&chunk->fcc);
  invert(&chunk->size);
}
#endif

#ifdef __BIG_ENDIAN__
static void Ilist(AviList *list)
{
  invert(&list->fcc);
  invert(&list->size);
  invert(&list->ids);
}

static void Imainh(AviMainHeader *mainh)
{
  invert(&mainh->fcc);
  invert(&mainh->size);
  invert(&mainh->MicroSecPerFrame);
  invert(&mainh->MaxBytesPerSec);
  invert(&mainh->PaddingGranularity);
  invert(&mainh->Flags);
  invert(&mainh->TotalFrames);
  invert(&mainh->InitialFrames);
  invert(&mainh->Streams);
  invert(&mainh->SuggestedBufferSize);
  invert(&mainh->Width);
  invert(&mainh->Height);
  invert(&mainh->Reserved[0]);
  invert(&mainh->Reserved[1]);
  invert(&mainh->Reserved[2]);
  invert(&mainh->Reserved[3]);
}

static void Istreamh(AviStreamHeader *streamh)
{
  invert(&streamh->fcc);
  invert(&streamh->size);
  invert(&streamh->Type);
  invert(&streamh->Handler);
  invert(&streamh->Flags);
  sinvert(&streamh->Priority);
  sinvert(&streamh->Language);
  invert(&streamh->InitialFrames);
  invert(&streamh->Scale);
  invert(&streamh->Rate);
  invert(&streamh->Start);
  invert(&streamh->Length);
  invert(&streamh->SuggestedBufferSize);
  invert(&streamh->Quality);
  invert(&streamh->SampleSize);
  sinvert(&streamh->left);
  sinvert(&streamh->right);
  sinvert(&streamh->top);
  sinvert(&streamh->bottom);
}

static void Ibitmaph(AviBitmapInfoHeader *bitmaph)
{
  invert(&bitmaph->fcc);
  invert(&bitmaph->size);
  invert(&bitmaph->Size);
  invert(&bitmaph->Width);
  invert(&bitmaph->Height);
  sinvert(&bitmaph->Planes);
  sinvert(&bitmaph->BitCount);
  invert(&bitmaph->Compression);
  invert(&bitmaph->SizeImage);
  invert(&bitmaph->XPelsPerMeter);
  invert(&bitmaph->YPelsPerMeter);
  invert(&bitmaph->ClrUsed);
  invert(&bitmaph->ClrImportant);
}

static void Imjpegu(AviMJPEGUnknown *mjpgu)
{
  invert(&mjpgu->a);
  invert(&mjpgu->b);
  invert(&mjpgu->c);
  invert(&mjpgu->d);
  invert(&mjpgu->e);
  invert(&mjpgu->f);
  invert(&mjpgu->g);
}

static void Iindexe(AviIndexEntry *indexe)
{
  invert(&indexe->ChunkId);
  invert(&indexe->Flags);
  invert(&indexe->Offset);
  invert(&indexe->Size);
}
#endif /* __BIG_ENDIAN__ */

void awrite(AviMovie *movie, void *datain, int block, int size, FILE *fp, int type)
{
#ifdef __BIG_ENDIAN__
  void *data;

  data = MEM_mallocN(size, "avi endian");

  memcpy(data, datain, size);

  switch (type) {
    case AVI_RAW:
      fwrite(data, block, size, fp);
      break;
    case AVI_CHUNK:
      Ichunk((AviChunk *)data);
      fwrite(data, block, size, fp);
      break;
    case AVI_LIST:
      Ilist((AviList *)data);
      fwrite(data, block, size, fp);
      break;
    case AVI_MAINH:
      Imainh((AviMainHeader *)data);
      fwrite(data, block, size, fp);
      break;
    case AVI_STREAMH:
      Istreamh((AviStreamHeader *)data);
      fwrite(data, block, size, fp);
      break;
    case AVI_BITMAPH:
      Ibitmaph((AviBitmapInfoHeader *)data);
      if (size == sizeof(AviBitmapInfoHeader) + sizeof(AviMJPEGUnknown)) {
        Imjpegu((AviMJPEGUnknown *)((char *)data + sizeof(AviBitmapInfoHeader)));
      }
      fwrite(data, block, size, fp);
      break;
    case AVI_MJPEGU:
      Imjpegu((AviMJPEGUnknown *)data);
      fwrite(data, block, size, fp);
      break;
    case AVI_INDEXE:
      Iindexe((AviIndexEntry *)data);
      fwrite(data, block, size, fp);
      break;
    default:
      break;
  }

  MEM_freeN(data);
#else  /* __BIG_ENDIAN__ */
  (void)movie; /* unused */
  (void)type;  /* unused */
  fwrite(datain, block, size, fp);
#endif /* __BIG_ENDIAN__ */
}