static int memread_ungetc(int c, IntPtr userdata)
{
MEMREAD_INFO info = userdata;
byte ch = (byte)c;
if ((info.offset > 0) && (info.block[info.offset - 1] == ch))
{
return(ch);
}
else
{
return(EOF);
}
}
static int memread_getc(IntPtr userdata)
{
MEMREAD_INFO info = userdata;
//ASSERT(info);
//ASSERT(info.offset <= info.length);
if (info.offset == info.length)
{
return(EOF);
}
else
{
return(info.block[info.offset++]);
}
}
static int memread_fread(IntPtr p, int n, IntPtr userdata)
{
MEMREAD_INFO info = userdata;
//size_t actual;
int actual;
//ASSERT(info);
//ASSERT(info.offset <= info.length);
actual = MIN((int)n, info.length - info.offset);
//memcpy(p, info.block + info.offset, actual);
info.offset += actual;
//ASSERT(info.offset <= info.length);
return(actual);
}
static int memread_seek(IntPtr userdata, int offset)
{
MEMREAD_INFO info = userdata;
int actual;
//ASSERT(info);
//ASSERT(info.offset <= info.length);
actual = MIN(offset, info.length - info.offset);
info.offset += actual;
//ASSERT(info.offset <= info.length);
if (offset == actual)
{
return(0);
}
else
{
return(-1);
}
}
/* This reads the files mysha.pcx and allegro.pcx into a memory block as
* binary data, and then uses the memory vtable to read the bitmaps out of
* the memory block.
*/
static void memread_test()
{
PACKFILE f;
MEMREAD_INFO memread_info = new MEMREAD_INFO();
BITMAP bmp, bmp2;
IntPtr block;
int l1, l2;
PACKFILE f1, f2;
l1 = file_size_ex("allegro.pcx");
l2 = file_size_ex("mysha.pcx");
//block = malloc(l1 + l2);
block = Marshal.AllocHGlobal(l1 + l2);
/* Read mysha.pcx into the memory block. */
f1 = pack_fopen("allegro.pcx", "rb");
CHECK(f1.pointer.ToInt32(), "opening allegro.pcx");
pack_fread(block, l1, f1);
pack_fclose(f1);
/* Read allegro.pcx into the memory block. */
f2 = pack_fopen("mysha.pcx", "rb");
CHECK(f2.pointer.ToInt32(), "opening mysha.pcx");
pack_fread(new ManagedPointer(block).Offset(l1), l2, f2);
pack_fclose(f2);
/* Open the memory block as PACKFILE, using our memory vtable. */
memread_info.block = block;
memread_info.length = l1 + l2;
memread_info.offset = 0;
f = pack_fopen_vtable(memread_vtable, memread_info);
CHECK(f.pointer.ToInt32(), "reading from memory block");
/* Read the bitmaps out of the memory block. */
// TODO: check why f gets nulled
PACKFILE t = f, u = f;
bmp = load_pcx_pf(f, NULL);
CHECK(bmp.pointer.ToInt32(), "load_pcx_pf");
//bmp2 = load_pcx_pf(f, NULL);
bmp2 = load_pcx_pf(t, NULL);
CHECK(bmp2.pointer.ToInt32(), "load_pcx_pf");
blit(bmp, screen, 0, 0, 0, 0, bmp.w, bmp.h);
textprintf_ex(screen, font, bmp.w + 8, 8, -1, -1,
"\"allegro.pcx\"");
textprintf_ex(screen, font, bmp.w + 8, 8 + 20, -1, -1,
"read out of a memory file");
blit(bmp2, screen, 0, 0, 0, bmp.h + 8, bmp2.w, bmp2.h);
textprintf_ex(screen, font, bmp2.w + 8, bmp.h + 8, -1, -1,
"\"mysha.pcx\"");
textprintf_ex(screen, font, bmp2.w + 8, bmp.h + 8 + 20, -1, -1,
"read out of a memory file");
destroy_bitmap(bmp);
destroy_bitmap(bmp2);
//pack_fclose(f);
pack_fclose(u);
next();
}
static int memread_feof(IntPtr userdata)
{
MEMREAD_INFO info = userdata;
return(info.offset >= info.length ? 1 : 0);
}
