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Merge pull request #2088 from bztsrc/main
Add png chunk loading
authored by
Vadim Grigoruk
and committed by
GitHub
880fa5ab
b70316c0
+31
+31
src/cart.c
+31
src/cart.c
···
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{
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memset(cart, 0, sizeof(tic_cartridge));
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const u8* end = buffer + size;
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u8 *chunk_cart = NULL;
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+
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// check if this cartridge is in PNG format
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if (!memcmp(buffer, "\x89PNG", 4))
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{
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s32 siz;
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const u8* ptr = buffer + 8;
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// iterate on chunks until we find a cartridge
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while (ptr < end)
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{
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siz = ((ptr[0] << 24) | (ptr[1] << 16) | (ptr[2] << 8) | ptr[3]);
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if (!memcmp(ptr + 4, "caRt", 4) && siz > 0)
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{
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chunk_cart = malloc(sizeof(tic_cartridge));
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if (chunk_cart)
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{
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size = tic_tool_unzip(chunk_cart, sizeof(tic_cartridge), ptr + 8, siz);
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buffer = chunk_cart;
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end = buffer + size;
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}
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break;
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}
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ptr += siz + 12;
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}
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// error, no TIC-80 cartridge chunk in PNG???
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if (!chunk_cart)
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return;
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}
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#define LOAD_CHUNK(to) memcpy(&to, ptr, MIN(sizeof(to), chunk->size ? retro_le_to_cpu16(chunk->size) : TIC_BANK_SIZE))
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···
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}
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}
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}
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// if we have allocated the buffer from a PNG chunk
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if (chunk_cart)
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free(chunk_cart);
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}
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