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Remove 0xFF padding from uncompressed ROMs (#1910)

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* Remove 0xFF padding from uncompressed ROMs

* Add comment about overdump contents

* Update checksum in README

* Reword comment
This commit is contained in:
cadmic 2024-03-04 08:39:16 -08:00 • committed by GitHub
parent e7b1868d84
commit 01a5fa9a45
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GPG key ID: B5690EEEBB952194
5 changed files with 14 additions and 33 deletions
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16
tools/elf2rom.c
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@ -33,12 +33,6 @@ static bool parse_number(const char *str, int *num)
return endptr > str;
}
static unsigned int round_up(unsigned int num, unsigned int multiple)
{
num += multiple - 1;
return num / multiple * multiple;
}
static char *sprintf_alloc(const char *fmt, ...)
{
va_list args;
@ -163,11 +157,10 @@ static void parse_input_file(const char *filename)
free(syms);
}
// Writes the N64 ROM, padding the file size to a multiple of 1 MiB
// Writes the N64 ROM
static void write_rom_file(const char *filename, int cicType)
{
size_t fileSize = round_up(g_romSize, 0x100000);
uint8_t *buffer = calloc(fileSize, 1);
uint8_t *buffer = calloc(g_romSize, 1);
int i;
uint32_t chksum[2];
@ -179,16 +172,13 @@ static void write_rom_file(const char *filename, int cicType)
memcpy(buffer + g_romSegments[i].romStart, g_romSegments[i].data, size);
}
// pad the remaining space with 0xFF
memset(buffer + g_romSize, 0xFF, fileSize - g_romSize);
// 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, fileSize);
util_write_whole_file(filename, buffer, g_romSize);
free(buffer);
}