67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
#include "cgdoom-frag.h"
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#include "os.h"
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#include "w_wad.h"
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int CGD_Frag_Map(const char *lumpname, CGD_Frag *frag)
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{
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int lump = W_CheckNumForName(lumpname);
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if(lump < 0)
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return 1;
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lumpinfo_t *l = &lumpinfo[lump];
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int size = l->size;
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int position = l->position;
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int f = 0;
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while(f < CGD_FRAG_ESTIMATE && size > 0) {
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int found = FindInFlash(&frag->data[f], size, position);
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frag->size[f] = found;
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size -= found;
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position += found;
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f++;
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}
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if(size) {
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I_Error("CGD_Frag_Map: failed on '%s' (size=%d, offset=%d), could only"
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" obtain %d", lumpname, l->size, l->position, l->size - size);
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return 1;
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}
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frag->size[f] = 0;
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return 0;
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}
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byte CGD_Frag_u8(CGD_Frag const *frag, int offset)
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{
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int f = 0;
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while(frag->size[f] != 0 && offset >= frag->size[f]) {
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offset -= frag->size[f];
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f++;
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}
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if(frag->size[f] == 0)
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return 0; /* read out-of-bounds */
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const byte *data = frag->data[f];
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return data[offset];
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}
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short CGD_Frag_i16LE(CGD_Frag const *frag, int offset)
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{
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byte b1 = CGD_Frag_u8(frag, offset);
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byte b2 = CGD_Frag_u8(frag, offset + 1);
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return (b2 << 8) | b1;
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}
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int CGD_Frag_i32LE(CGD_Frag const *frag, int offset)
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{
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byte b1 = CGD_Frag_u8(frag, offset);
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byte b2 = CGD_Frag_u8(frag, offset + 1);
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byte b3 = CGD_Frag_u8(frag, offset + 2);
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byte b4 = CGD_Frag_u8(frag, offset + 3);
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return (b4 << 24) | (b3 << 16) | (b2 << 8) | b1;
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}
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