50 lines
931 B
C
Executable File
50 lines
931 B
C
Executable File
#define OFF 20
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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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FILE * f;
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char * buf;
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unsigned long sz,newsz;
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if(argc<3)
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{
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printf("Usage:\n");
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printf("%s filename memsize_hex\n",argv[0]);
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printf("Example:\n\t%s test.app 100000\n",argv[0]);
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return -1;
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}
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sscanf(argv[2],"%x",&newsz);
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if(newsz<0x10000 || newsz>0x2000000) /* Min 64kB max 32MB */
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{
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printf("Impossibly large memory size %x\n",newsz);
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return -1;
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}
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f=fopen(argv[1],"rb");
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if(!f)
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{
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printf("Unable to open file\n");
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return -1;
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}
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fseek(f,0,SEEK_END);
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sz=ftell(f);
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fseek(f,0,SEEK_SET);
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buf=malloc(sz);
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if(!buf)
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{
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printf("Unable to allocate temporary buffer\n");
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fclose(f);
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return -1;
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}
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fread(buf,1,sz,f);
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fclose(f);
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f=fopen(argv[1],"wb");
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*((unsigned long *)(buf+OFF))=newsz;
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fwrite(buf,1,sz,f);
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fclose(f);
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free(buf);
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return 0;
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}
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