Function BZ2_bzBuffToBuffDecompress 

pub unsafe extern "C" fn BZ2_bzBuffToBuffDecompress(
    dest: *mut c_char,
    destLen: *mut c_uint,
    source: *mut c_char,
    sourceLen: c_uint,
    small: c_int,
    verbosity: c_int,
) -> c_int

Decompress the input data into the destination buffer.

This function attempts to decompress the data in source[0 .. sourceLen] into dest[0 .. *destLen]. If the destination buffer is big enough, *destLen is set to the size of the decompressed data, and BZ_OK is returned. If the decompressed data won’t fit, *destLen is unchanged, and BZ_OUTBUFF_FULL is returned.

For the meaning of parameters small, verbosity, see BZ2_bzDecompressInit.

Because the compression ratio of the compressed data cannot be known in advance, there is no easy way to guarantee that the output buffer will be big enough. You may of course make arrangements in your code to record the size of the uncompressed data, but such a mechanism is beyond the scope of this library.

Returns

• BZ_PARAM_ERROR if any of
  • dest.is_null()
  • destLen.is_null()
  • source.is_null()
  • !(0..=1).contains(&small)
  • !(0..=4).contains(&verbosity)
• BZ_MEM_ERROR if insufficient memory is available
• BZ_OUTBUFF_FULL if the size of the compressed data exceeds *destLen
• BZ_DATA_ERROR if a data integrity error is detected in the compressed stream
• BZ_DATA_ERROR_MAGIC if the compressed stream doesn’t begin with the right magic bytes
• BZ_UNEXPECTED_EOF if the compressed data ends before the logical end-of-stream was detected
• BZ_OK otherwise

Safety

The caller must guarantee that

• destLen satisfies the requirements of pointer::as_mut
• Either
  • dest is NULL
  • dest is writable for *destLen bytes
• Either
  • source is NULL
  • source is readable for sourceLen