mirror of
https://github.com/zeldaret/oot.git
synced 2024-12-05 01:06:37 +00:00
01a5fa9a45
* Remove 0xFF padding from uncompressed ROMs * Add comment about overdump contents * Update checksum in README * Reword comment
257 lines
6.7 KiB
C
257 lines
6.7 KiB
C
#include <stdarg.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "elf32.h"
|
|
#include "n64chksum.h"
|
|
#include "util.h"
|
|
|
|
#define ROM_SEG_START_SUFFIX ".rom_start"
|
|
#define ROM_SEG_END_SUFFIX ".rom_end"
|
|
|
|
struct RomSegment
|
|
{
|
|
const char *name;
|
|
const void *data;
|
|
int size;
|
|
int romStart;
|
|
int romEnd;
|
|
};
|
|
|
|
static struct RomSegment *g_romSegments = NULL;
|
|
static int g_romSegmentsCount = 0;
|
|
static int g_romSize;
|
|
|
|
static bool parse_number(const char *str, int *num)
|
|
{
|
|
char *endptr;
|
|
long int n = strtol(str, &endptr, 0);
|
|
*num = n;
|
|
return endptr > str;
|
|
}
|
|
|
|
static char *sprintf_alloc(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int size;
|
|
char *buffer;
|
|
|
|
va_start(args, fmt);
|
|
size = vsnprintf(NULL, 0, fmt, args) + 1;
|
|
va_end(args);
|
|
|
|
buffer = malloc(size);
|
|
|
|
va_start(args, fmt);
|
|
vsprintf(buffer, fmt, args);
|
|
va_end(args);
|
|
|
|
return buffer;
|
|
}
|
|
|
|
static struct RomSegment *add_rom_segment(const char *name)
|
|
{
|
|
int index = g_romSegmentsCount;
|
|
|
|
g_romSegmentsCount++;
|
|
g_romSegments = realloc(g_romSegments, g_romSegmentsCount * sizeof(*g_romSegments));
|
|
g_romSegments[index].name = name;
|
|
return &g_romSegments[index];
|
|
}
|
|
|
|
static int find_symbol_value(struct Elf32_Symbol *syms, int numsymbols, const char *name)
|
|
{
|
|
struct Elf32_Symbol *sym;
|
|
int lo, hi, mid, cmp;
|
|
|
|
// Binary search for the symbol. We maintain the invariant that [lo, hi) is
|
|
// the interval that remains to search.
|
|
lo = 0;
|
|
hi = numsymbols;
|
|
while (lo < hi)
|
|
{
|
|
mid = lo + (hi - lo) / 2;
|
|
sym = &syms[mid];
|
|
cmp = strcmp(sym->name, name);
|
|
|
|
if (cmp == 0)
|
|
return (int) sym->value;
|
|
else if (cmp < 0)
|
|
lo = mid + 1;
|
|
else
|
|
hi = mid;
|
|
}
|
|
|
|
util_fatal_error("Symbol %s is not defined\n", name);
|
|
}
|
|
|
|
static int find_rom_address(struct Elf32_Symbol *syms, int numsymbols, const char *name, const char *suffix)
|
|
{
|
|
char *symName = sprintf_alloc("_%sSegmentRom%s", name, suffix);
|
|
int ret = find_symbol_value(syms, numsymbols, symName);
|
|
free(symName);
|
|
return ret;
|
|
}
|
|
|
|
static int cmp_symbol_by_name(const void *a, const void *b)
|
|
{
|
|
return strcmp(
|
|
((struct Elf32_Symbol *)a)->name,
|
|
((struct Elf32_Symbol *)b)->name);
|
|
}
|
|
|
|
static void parse_input_file(const char *filename)
|
|
{
|
|
struct Elf32 elf;
|
|
struct Elf32_Symbol *syms;
|
|
const void *data;
|
|
size_t size;
|
|
int numRomSymbols;
|
|
int i;
|
|
|
|
data = util_read_whole_file(filename, &size);
|
|
|
|
if (!elf32_init(&elf, data, size) || elf.machine != ELF_MACHINE_MIPS)
|
|
util_fatal_error("%s is not a valid 32-bit MIPS ELF file", filename);
|
|
|
|
// sort all symbols that contain the substring "Rom" for fast access
|
|
// (sorting all symbols costs 0.1s, might as well avoid that)
|
|
syms = malloc(elf.numsymbols * sizeof(struct Elf32_Symbol));
|
|
numRomSymbols = 0;
|
|
for (i = 0; i < elf.numsymbols; i++)
|
|
{
|
|
if (!elf32_get_symbol(&elf, &syms[numRomSymbols], i))
|
|
util_fatal_error("invalid or corrupt ELF file");
|
|
if (strstr(syms[numRomSymbols].name, "Rom"))
|
|
numRomSymbols++;
|
|
}
|
|
qsort(syms, numRomSymbols, sizeof(struct Elf32_Symbol), cmp_symbol_by_name);
|
|
|
|
// get ROM segments
|
|
// sections of type SHT_PROGBITS and whose name is ..secname are considered ROM segments
|
|
for (i = 0; i < elf.shnum; i++)
|
|
{
|
|
struct Elf32_Section sec;
|
|
struct RomSegment *segment;
|
|
|
|
if (!elf32_get_section(&elf, &sec, i))
|
|
util_fatal_error("invalid or corrupt ELF file");
|
|
if (sec.type == SHT_PROGBITS && sec.name[0] == '.' && sec.name[1] == '.'
|
|
// HACK! ld sometimes marks NOLOAD sections as SHT_PROGBITS for no apparent reason,
|
|
// so we must ignore the ..secname.bss sections explicitly
|
|
&& strchr(sec.name + 2, '.') == NULL)
|
|
{
|
|
segment = add_rom_segment(sec.name + 2);
|
|
segment->data = elf.data + sec.offset;
|
|
segment->romStart = find_rom_address(syms, numRomSymbols, segment->name, "Start");
|
|
segment->romEnd = find_rom_address(syms, numRomSymbols, segment->name, "End");
|
|
}
|
|
|
|
}
|
|
|
|
g_romSize = find_symbol_value(syms, numRomSymbols, "_RomSize");
|
|
|
|
free(syms);
|
|
}
|
|
|
|
// Writes the N64 ROM
|
|
static void write_rom_file(const char *filename, int cicType)
|
|
{
|
|
uint8_t *buffer = calloc(g_romSize, 1);
|
|
int i;
|
|
uint32_t chksum[2];
|
|
|
|
// write segments
|
|
for (i = 0; i < g_romSegmentsCount; i++)
|
|
{
|
|
int size = g_romSegments[i].romEnd - g_romSegments[i].romStart;
|
|
|
|
memcpy(buffer + g_romSegments[i].romStart, g_romSegments[i].data, size);
|
|
}
|
|
|
|
// write checksum
|
|
if (!n64chksum_calculate(buffer, cicType, chksum))
|
|
util_fatal_error("invalid cic type %i", cicType);
|
|
util_write_uint32_be(buffer + 0x10, chksum[0]);
|
|
util_write_uint32_be(buffer + 0x14, chksum[1]);
|
|
|
|
util_write_whole_file(filename, buffer, g_romSize);
|
|
free(buffer);
|
|
}
|
|
|
|
static void usage(const char *execname)
|
|
{
|
|
printf("usage: %s -cic <number> input.elf output.z64\n", execname);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int i;
|
|
const char *inputFileName = NULL;
|
|
const char *outputFileName = NULL;
|
|
int cicType = -1;
|
|
|
|
for (i = 1; i < argc; i++)
|
|
{
|
|
if (argv[i][0] == '-')
|
|
{
|
|
if (strcmp(argv[i], "-cic") == 0)
|
|
{
|
|
i++;
|
|
if (i >= argc || !parse_number(argv[i], &cicType))
|
|
{
|
|
fputs("error: expected number after -cic\n", stderr);
|
|
goto bad_args;
|
|
}
|
|
}
|
|
else if (strcmp(argv[i], "-help") == 0)
|
|
{
|
|
usage(argv[0]);
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "unknown option %s\n", argv[i]);
|
|
goto bad_args;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (inputFileName == NULL)
|
|
inputFileName = argv[i];
|
|
else if (outputFileName == NULL)
|
|
outputFileName = argv[i];
|
|
else
|
|
{
|
|
fputs("error: too many parameters specified\n", stderr);
|
|
goto bad_args;
|
|
}
|
|
}
|
|
}
|
|
if (inputFileName == NULL)
|
|
{
|
|
fputs("error: no input file specified\n", stderr);
|
|
goto bad_args;
|
|
}
|
|
if (outputFileName == NULL)
|
|
{
|
|
fputs("error: no output file specified\n", stderr);
|
|
goto bad_args;
|
|
}
|
|
if (cicType == -1)
|
|
{
|
|
fputs("error: no CIC type specified\n", stderr);
|
|
goto bad_args;
|
|
}
|
|
|
|
parse_input_file(inputFileName);
|
|
write_rom_file(outputFileName, cicType);
|
|
return 0;
|
|
|
|
bad_args:
|
|
usage(argv[0]);
|
|
return 1;
|
|
}
|