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opusdec: Write WAV size up to 4 GiB

The WAV size fields are unsigned 32-bit integers.  Fill them in if
the size would be less than 0xffffffff; otherwise use 0xffffffff to
indicate that the chunk continues until end of file (an unofficial
convention to allow WAV files larger than 4 GiB, when no chunks
follow the audio data).

--- a/src/wav_io.c

+++ b/src/wav_io.c

@@ -83,7 +83,7 @@

    extensible |= fp;

    ret = fprintf(file, "RIFF") >= 0;

-   ret &= fwrite_le32(0x7fffffff, file);

+   ret &= fwrite_le32(0xffffffff, file);

    ret &= fprintf(file, "WAVEfmt ") >= 0;

    ret &= fwrite_le32(extensible ? 40 : 16, file);

@@ -135,7 +135,7 @@

    }

    ret &= fprintf(file, "data") >= 0;

-   ret &= fwrite_le32(0x7fffffff, file);

+   ret &= fwrite_le32(0xffffffff, file);

    return !ret ? -1 : extensible ? 40 : 16;

 }

@@ -147,12 +147,18 @@

 {

    opus_int32 write_val;

-   if (format <= 0 || audio_size >= 0x7fffffff) return 0;

-   if (fseek(file, 4, SEEK_SET) != 0) return -1;

-   write_val = le_int((opus_int32)(audio_size + 20 + format));

-   if (fwrite(&write_val, 4, 1, file) != 1) return -1;

-   if (fseek(file, 16 + format, SEEK_CUR) != 0) return -1;

-   write_val = le_int((opus_int32)audio_size);

-   if (fwrite(&write_val, 4, 1, file) != 1) return -1;

+   if (format <= 0 || audio_size < 0) return 0;

+   if (audio_size < (opus_int64)0xffffffffU - 20 - format)

+   {

+      if (fseek(file, 4, SEEK_SET) != 0) return -1;

+      write_val = le_int((opus_int32)(audio_size + 20 + format));

+      if (fwrite(&write_val, 4, 1, file) != 1) return -1;

+   }

+   if (audio_size < (opus_int64)0xffffffffU)

+   {

+      if (fseek(file, 24 + format, SEEK_SET) != 0) return -1;

+      write_val = le_int((opus_int32)audio_size);

+      if (fwrite(&write_val, 4, 1, file) != 1) return -1;

+   }

    return 0;

 }