Function ReadLayerBlock

DevIL/src-IL/src/il_psp.cpp:304–377

ILboolean ReadLayerBlock(ILuint BlockLen)
{
	BLOCKHEAD			Block;
	LAYERINFO_CHUNK		LayerInfo;
	LAYERBITMAP_CHUNK	Bitmap;
	ILuint				ChunkSize, Padding, i, j;
	ILushort			NumChars;

	BlockLen;

	// Layer sub-block header
	if (iread(&Block, 1, sizeof(Block)) != sizeof(Block))
		return IL_FALSE;
	if (Header.MajorVersion == 3)
		Block.BlockLen = GetLittleUInt();
	else
		UInt(&Block.BlockLen);

	if (Block.HeadID[0] != 0x7E || Block.HeadID[1] != 0x42 ||
		Block.HeadID[2] != 0x4B || Block.HeadID[3] != 0x00) {
			return IL_FALSE;
	}
	if (Block.BlockID != PSP_LAYER_BLOCK)
		return IL_FALSE;


	if (Header.MajorVersion == 3) {
		iseek(256, IL_SEEK_CUR);  // We don't care about the name of the layer.
		iread(&LayerInfo, sizeof(LayerInfo), 1);
		if (iread(&Bitmap, sizeof(Bitmap), 1) != 1)
			return IL_FALSE;
	}
	else {  // Header.MajorVersion >= 4
		ChunkSize = GetLittleUInt();
		NumChars = GetLittleUShort();
		iseek(NumChars, IL_SEEK_CUR);  // We don't care about the layer's name.

		ChunkSize -= (2 + 4 + NumChars);

		if (iread(&LayerInfo, IL_MIN(sizeof(LayerInfo), ChunkSize), 1) != 1)
			return IL_FALSE;

		// Can have new entries in newer versions of the spec (5.0).
		Padding = (ChunkSize) - sizeof(LayerInfo);
		if (Padding > 0)
			iseek(Padding, IL_SEEK_CUR);

		ChunkSize = GetLittleUInt();
		if (iread(&Bitmap, sizeof(Bitmap), 1) != 1)
			return IL_FALSE;
		Padding = (ChunkSize - 4) - sizeof(Bitmap);
		if (Padding > 0)
			iseek(Padding, IL_SEEK_CUR);
	}


	Channels = (ILubyte**)ialloc(sizeof(ILubyte*) * Bitmap.NumChannels);
	if (Channels == NULL) {