Function inflateBack

extlibs/minizip/src/infback.c:253–674

strm provides the memory allocation functions and window buffer on input, and provides information on the unused input on return. For Z_DATA_ERROR returns, strm will also provide an error message. in() and out() are the call-back input and output functions. When inflateBack() needs more input, it calls in(). When inflateBack() has filled the window with output, or when it comple

(strm, in, in_desc, out, out_desc)

   are not correct, i.e. strm is Z_NULL or the state was not initialized.
 */
int ZEXPORT inflateBack(strm, in, in_desc, out, out_desc)
z_streamp strm;
in_func in;
void FAR * in_desc;
out_func out;

void FAR * out_desc;
{
    struct inflate_state FAR * state;
    z_const unsigned char FAR * next; /* next input */
    unsigned char FAR * put; /* next output */
    unsigned have, left; /* available input and output */
    unsigned long hold; /* bit buffer */
    unsigned bits; /* bits in bit buffer */
    unsigned copy; /* number of stored or match bytes to copy */
    unsigned char FAR * from; /* where to copy match bytes from */
    code here; /* current decoding table entry */
    code last; /* parent table entry */
    unsigned len; /* length to copy for repeats, bits to drop */
    int ret; /* return code */
    static const unsigned short order[19] = /* permutation of code lengths */
        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};

    /* Check that the strm exists and that the state was initialized */
    if (strm == Z_NULL || strm->state == Z_NULL)
        return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;

    /* Reset the state */
    strm->msg = Z_NULL;
    state->mode = TYPE;
    state->last = 0;
    state->whave = 0;
    next = strm->next_in;
    have = next != Z_NULL ? strm->avail_in : 0;
    hold = 0;
    bits = 0;
    put = state->window;
    left = state->wsize;

    /* Inflate until end of block marked as last */
    for (;;)
        switch (state->mode)
        {
        case TYPE:
            /* determine and dispatch block type */
            if (state->last)
            {
                BYTEBITS();
                state->mode = DONE;
                break;
            }
            NEEDBITS(3);
            state->last = BITS(1);
            DROPBITS(1);
            switch (BITS(2))
            {
            case 0: /* stored block */