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// ================================================================================================
// Basic RIFF/WAVE file traversal. Does not do any real parsing.
//
// ref: https://mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Docs/riffmci.pdf
//
// Changelog:
// 9/20/2026: Initial release
// 9/22/2026: Can now accept multiple files
//
// License:
// SPDX-License-Identifier: 0BSD
// Copyright (c) 2026 Hunter Kvalevog
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE.
// ================================================================================================
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef __GNUC__
# define ATTR_NORETURN __attribute__((noreturn))
# define ATTR_PRINTF(A1, A2) __attribute__((format(printf, A1, A2)))
#else
# define ATTR_NORETURN
# define ATTR_PRINTF(A1, A2)
#endif
ATTR_NORETURN
ATTR_PRINTF(1, 2)
static void die(const char *fmt, ...)
{
va_list va; va_start(va, fmt);
vprintf(fmt, va);
va_end(va);
exit(1);
}
static const char *unfourcc(uint32_t id)
{
static char b[5] = { 0 };
b[0] = (id) & 0xFF;
b[1] = (id >> 8) & 0xFF;
b[2] = (id >> 16) & 0xFF;
b[3] = (id >> 24) & 0xFF;
return b;
}
int main(int argc, const char **argv)
{
if (argc < 2)
die("no file");
for (int i = 1; i < argc; ++i)
{
printf("%s:\n", argv[i]);
FILE* fp = fopen(argv[i], "rb");
if (!fp)
die("failed to open file: %s", strerror(errno));
uint8_t buf[256];
if (fread(buf, 1, 12, fp) != 12)
return 1;
if (memcmp(buf, "RIFF", 4) || memcmp(buf + 8, "WAVE", 4))
die("Invalid file");
while (!feof(fp))
{
if (fread(buf, 1, 8, fp) != 8)
break;
uint32_t tag = *(uint32_t *)buf;
uint32_t size = *(uint32_t *)(buf + 4);
printf(" %s\n", unfourcc(tag));
fseek(fp, size, SEEK_CUR);
}
}
return 0;
}
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