rdram2new.c
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#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "verify.h"
char *InputFileName=NULL, *OutputFileName=NULL;
FILE *InputFile, *OutputFile;
void usage(void)
{
fprintf(stderr, "usage: rdram2new -i in.rdram -o out.rdram \n");
exit(1);
}
int fsize(char *name)
{
struct stat stbuf;
if (stat(name, &stbuf) == -1)
{
fprintf(stderr, "fsize: cannot access %s\n", name);
return;
}
return(stbuf.st_size);
}
void ReadAndProcessInputFile(void)
{
int InputFileSize;
unsigned char *MainMemory, *HiddenMemory, OldByte;
int MainMemorySize, HiddenMemorySize;
VerifyInfo *VerifyStuff;
int i;
if ((InputFile = fopen(InputFileName, "r")) == NULL)
{
fprintf(stderr, "Error, could not open input file %s \n", InputFileName);
exit(1);
}
InputFileSize = fsize(InputFileName);
MainMemorySize = 0;
HiddenMemorySize = 0;
if (InputFileSize == 0x400000)
{
MainMemorySize = 0x400000;
HiddenMemorySize = 0x000000;
}
else if (InputFileSize == 0x440000)
{
MainMemorySize = 0x400000;
HiddenMemorySize = 0x040000;
}
else if (InputFileSize == 0x200000)
{
MainMemorySize = 0x200000;
HiddenMemorySize = 0;
}
else if (InputFileSize == 0x240000)
{
MainMemorySize = 0x200000;
HiddenMemorySize = 0x040000;
}
else
{
fprintf(stderr, "ERROR: file size not correct \n");
exit(1);
}
MainMemory = (unsigned char *) malloc(MainMemorySize);
HiddenMemory = (unsigned char *) malloc(HiddenMemorySize);
fread(MainMemory, MainMemorySize, 1, InputFile);
VerifyStuff = (VerifyInfo *) (MainMemory + VERIFY_INFO_PHYSADDR);
if ((VerifyStuff->magicNumber == MAGICNUMBER) &&
(VerifyStuff->version == VERSION))
{
fprintf(stderr, "ERROR: rdram file is already in new format \n");
exit(1);
}
VerifyStuff->magicNumber = MAGICNUMBER;
VerifyStuff->version = VERSION;
if ((OutputFile = fopen(OutputFileName, "w")) == NULL)
{
fprintf(stderr, "Error, could not open output file %s \n", OutputFileName);
exit(1);
}
fwrite(MainMemory, MainMemorySize, 1, OutputFile);
/* Now read in hidden bits and do the right thing */
fread(HiddenMemory, HiddenMemorySize, 1, InputFile);
/* Not being efficient here, just getting the job done.
Were this an actual Microsoft interview I'd be much
more obtuse.. */
for (i=0; i<HiddenMemorySize; i++)
{
OldByte = HiddenMemory[i];
HiddenMemory[i] =
((OldByte & 3) << 6) |
((OldByte & 12) << 2) |
((OldByte & 48) >> 2) |
((OldByte & 192) >> 6);
}
fwrite(HiddenMemory, HiddenMemorySize, 1, OutputFile);
fclose(InputFile);
fclose(OutputFile);
}
int main(int argc, char **argv)
{
int c;
extern char *optarg;
extern int optind;
char *ofile = NULL;
while ((c = getopt(argc, argv, "i:o:")) != EOF)
switch (c)
{
case 'i':
InputFileName = strdup(optarg);
break;
case 'o':
OutputFileName = strdup(optarg);
break;
}
if (InputFileName == NULL)
usage();
if (OutputFileName == NULL)
usage();
ReadAndProcessInputFile();
exit(0);
}