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)
BOOL bResult = FALSE;
const long start_offset = io->tell_proc(handle);
TGAHEADER header;
io->read_proc(&header, sizeof(tagTGAHEADER), 1, handle);
// rewind
io->seek_proc(handle, start_offset, SEEK_SET);
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:
bResult = TRUE;
break;
default:
bResult = FALSE;
break;
}
break;
default:
bResult = FALSE;
break;
}
return bResult;
}
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;
}
}
}
