89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/* Altera zero packer and depacker by Shaos (2017,2021) */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main(int argc, char** argv)
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{
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int b,i,n;
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long l,maxzero,nonzero,nzero,sz,current=0;
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FILE *f,*fo;
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if(argc<3)
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{
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printf("\n\t%s imgfilename packedfilename\nor",argv[0]);
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printf("\n\t%s -d packedfilename depackedfile\n",argv[0]);
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return 0;
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}
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if(argv[1][0]=='-' && argv[1][1]=='d')
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{
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f = fopen(argv[2],"rb");
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if(f==NULL) return -1;
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if(argc==3) fo = fopen("Altera.bin","wb");
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else fo = fopen(argv[3],"wb");
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if(fo==NULL){fclose(f);return -2;}
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fseek(f,0,SEEK_END);
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sz = ftell(f);
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printf("Size=%li\n",sz);
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fseek(f,0,SEEK_SET);
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printf("Depack %s (size=%li)\n",argv[2],sz);
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for(l=0;l<sz;l++)
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{
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b = fgetc(f);
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if(b) fputc(b,fo);
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else
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{
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l++;
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n = fgetc(f);
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for(i=0;i<n;i++) fputc(0,fo);
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}
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}
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fclose(fo);
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fclose(f);
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return 0;
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}
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f = fopen(argv[1],"rb");
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if(f==NULL) return -1;
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fseek(f,0,SEEK_END);
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sz = ftell(f);
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printf("Size=%li\n",sz);
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fseek(f,0,SEEK_SET);
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fo = fopen(argv[2],"wb");
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if(fo==NULL){fclose(f);return -2;}
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maxzero = nonzero = current = nzero = 0;
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for(l=0;l<sz;l++)
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{
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b = fgetc(f);
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if(b || nzero==255)
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{
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if(nzero)
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{
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if(nzero>maxzero) maxzero=nzero;
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current+=2;
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fputc(0,fo);
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fputc(nzero,fo);
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}
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if(b)
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{
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nzero = 0;
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nonzero++;
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current++;
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fputc(b,fo);
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}
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else nzero = 1;
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}
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else nzero++;
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}
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if(nzero)
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{
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if(nzero>maxzero) maxzero=nzero;
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current+=2;
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fputc(0,fo);
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fputc(nzero,fo);
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}
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printf("maxzero=%li nonzero=%li current=%li\n",maxzero,nonzero,current);
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fclose(fo);
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fclose(f);
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return 0;
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}
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