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Anachronaut
2024-10-26 15:33:13 -04:00
committed by GitHub
parent 0df6271f8b
commit fc9281d595
1 changed files with 0 additions and 97 deletions
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// boostrap.c
// Boostrapping Functions for the SplitBit CPU Emulator
// Written by Anachronaut
// 10/16/2024
#include "bootstrap.h"
#include <stdio.h>
#include <string.h>
int byte = 0;
const uint8_t HEADER_LENGTH = 3; // Number of bytes for the header.
const uint8_t LENGTH_SIZE = 2; // Number of bytes for the segment length.
uint32_t readLength(FILE *file) {
uint16_t length = 0;
for (int i = 0; i < LENGTH_SIZE; i++) {
int byte = fgetc(file);
if (byte == EOF) {
fprintf(stderr, "Error: Unexpected end of file while reading a segment length.\n");
return UINT32_MAX;
}
length = (length << 8) | (uint8_t)byte;
}
return length;
}
uint32_t readHeader(FILE *file, const char *expectedHeader) {
char header[HEADER_LENGTH];
for (int i = 0; i < HEADER_LENGTH; i++) {
int byte = fgetc(file);
if (byte == EOF) {
fprintf(stderr, "Error: Unexpected end of file while reading a header.\n");
return UINT32_MAX;
}
header[i] = (uint8_t)byte;
}
if (strncmp(header, expectedHeader, 3)) {
fprintf(stderr, "Error: Bad header.\n");
printf("Header: %s\nExpected Header: %s\n", header, expectedHeader);
return UINT32_MAX;
}
return 0;
}
uint8_t loadSegment(FILE *file, uint8_t *Memory, uint16_t length) {
for (int16_t i = 0; i < length; i++) {
byte = fgetc(file);
if (byte == EOF) {
fprintf(stderr, "Error: Unexpected end of file while reading a segment.\n");
return 1;
}
Memory[i] = (uint8_t)byte;
}
return 0;
}
uint8_t loadFile(char *path, uint8_t *Program, uint8_t *Data) {
FILE *file = fopen(path, "rb");
if (file == NULL) {
fprintf(stderr, "Error: Couldn't open file: %s\n", path);
return 1;
}
// Read the first three bytes and check if they're the PRG header.
if (readHeader(file, "PRG") == UINT32_MAX) {
fclose(file);
return 1;
}
// Now we need to get the length of the Program Section.
uint32_t length = readLength(file);
if (length == UINT32_MAX) {
fclose(file);
return 1;
}
// Now we load the Program Segment.
if (loadSegment(file, Program, (uint16_t)length)) {
fclose(file);
return 1;
}
// Okay, Program is loaded, now do the same thing but for Data.
// Check the header.
if (readHeader(file, "DAT") == UINT32_MAX) {
return 1;
}
// Get the legnth of the Data Section.
length = readLength(file);
if (length == UINT32_MAX){
fclose(file);
return 1;
}
// Now load the Data Section.
if (loadSegment(file, Data, (uint16_t)length)) {
fclose(file);
return 1;
}
fclose(file);
return 0;
}