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src/Source/FreeImage/PluginTARGA.cpp  view on Meta::CPAN

}

static BOOL 
isTARGA20(FreeImageIO *io, fi_handle handle) {
	const unsigned sizeofSig = 18;
	BYTE signature[sizeofSig];
	// tga_signature = "TRUEVISION-XFILE." (TGA 2.0 only)
	BYTE tga_signature[sizeofSig] = { 84, 82, 85, 69, 86, 73, 83, 73, 79, 78, 45, 88, 70, 73, 76, 69, 46, 0 };
	// get the start offset
	const long start_offset = io->tell_proc(handle);
	// get the end-of-file
	io->seek_proc(handle, 0, SEEK_END);
	const long eof = io->tell_proc(handle);
	// read the signature
	io->seek_proc(handle, start_offset + eof - sizeofSig, SEEK_SET);
	io->read_proc(&signature, 1, sizeofSig, handle);
	// rewind
	io->seek_proc(handle, start_offset, SEEK_SET);
		
	return (memcmp(tga_signature, signature, sizeofSig) == 0);
}

static BOOL DLL_CALLCONV
Validate(FreeImageIO *io, fi_handle handle) { 
	if(isTARGA20(io, handle)) {
		return TRUE;
	}
		
	// not a 2.0 image, try testing if it's a valid TGA anyway (not robust)
	{
		const long start_offset = io->tell_proc(handle);
		
		// get the header
		TGAHEADER header;
		io->read_proc(&header, sizeof(tagTGAHEADER), 1, handle);
#ifdef FREEIMAGE_BIGENDIAN
		SwapHeader(&header);
#endif
		// rewind
		io->seek_proc(handle, start_offset, SEEK_SET);

		// the color map type should be a 0 or a 1...
		if(header.color_map_type != 0 && header.color_map_type != 1) {
			return FALSE;
		}
		// if the color map type is 1 then we validate the map entry information...
		if(header.color_map_type > 0) {
			// it doesn't make any sense if the first entry is larger than the color map table
			if(header.cm_first_entry >= header.cm_length) {
				return FALSE;
			}
			// check header.cm_size, don't allow 0 or anything bigger than 32
			if(header.cm_size == 0 || header.cm_size > 32) {
				return FALSE;
			}
		}
		// the width/height shouldn't be 0, right ?
		if(header.is_width == 0 || header.is_height == 0) {
			return FALSE;
		}
		// let's now verify all the types that are supported by FreeImage (this is our final verification)
		switch(header.image_type) {
			case TGA_CMAP:
			case TGA_RGB:
			case TGA_MONO:
			case TGA_RLECMAP:
			case TGA_RLERGB:
			case TGA_RLEMONO:
				switch(header.is_pixel_depth) {
					case 8	:
					case 16:
					case 24:
					case 32:
						return TRUE;
					default:
						return FALSE;
				}
				break;
			default:
				return FALSE;
		}
	}
}

static BOOL DLL_CALLCONV
SupportsExportDepth(int depth) {
	return (
		(depth == 8) ||
		(depth == 16) ||
		(depth == 24) ||
		(depth == 32)
		);
}

static BOOL DLL_CALLCONV
SupportsExportType(FREE_IMAGE_TYPE type) {
	return (type == FIT_BITMAP) ? TRUE : FALSE;
}

static BOOL DLL_CALLCONV
SupportsNoPixels() {
	return TRUE;
}

// ----------------------------------------------------------

/**
Used for all 32 and 24 bit loading of uncompressed images
*/
static void 
loadTrueColor(FIBITMAP* dib, int width, int height, int file_pixel_size, FreeImageIO* io, fi_handle handle, BOOL as24bit) {
	const int pixel_size = as24bit ? 3 : file_pixel_size;

	// input line cache
	BYTE* file_line = (BYTE*)malloc( width * file_pixel_size);

	if (!file_line) {
		throw FI_MSG_ERROR_MEMORY;
	}

	for (int y = 0; y < height; y++) {