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/// @file
#include <allocate.h>
#include <stdio.h>
#include "zlib.h"
#include "jets/q.h"
#include "jets/w.h"
#include "noun.h"
static void*
zlib_malloc(voidpf opaque, uInt items, uInt size)
{
size_t len = items * size;
void* result = u3a_malloc(len);
return result;
}
static void
zlib_free(voidpf opaque, voidpf address)
{
u3a_free(address);
}
u3_noun
_decompress(u3_atom pos, u3_noun octs, int window_bits)
{
u3_atom p_octs = u3h(octs);
u3_atom q_octs = u3t(octs);
c3_w p_octs_w, pos_w;
if ( c3n == u3r_safe_word(p_octs, &p_octs_w) ) {
return u3_none;
}
if (c3n == u3r_safe_word(pos, &pos_w)) {
return u3_none;
}
c3_w len_w = u3r_met(3, q_octs);
int leading_zeros = 0;
if (p_octs_w > len_w) {
leading_zeros = p_octs_w - len_w;
}
else {
len_w = p_octs_w;
}
// Bytestream exhausted
//
if (pos_w >= len_w) {
return u3_none;
}
c3_y* input;
if (c3y == u3a_is_cat(q_octs)) {
input = (c3_y*)&q_octs + pos_w;
}
else {
u3a_atom* vat_u = u3a_to_ptr(q_octs);
input = (c3_y*)vat_u->buf_w + pos_w;
}
int ret;
z_stream strm;
if (pos_w < len_w) {
strm.avail_in = (len_w - pos_w);
}
else {
strm.avail_in = 0;
}
strm.zalloc = zlib_malloc;
strm.zfree = zlib_free;
strm.opaque = Z_NULL;
strm.next_in = input;
ret = inflateInit2(&strm, window_bits);
if (ret != Z_OK) {
u3l_log("%i", ret);
u3l_log("%s", strm.msg);
return u3m_bail(c3__exit);
}
c3_w chunk_w = len_w / 10;
u3i_slab sab_u;
#define INIT_SZ 16384
strm.avail_out = INIT_SZ;
u3i_slab_init(&sab_u, 3, INIT_SZ);
strm.next_out = sab_u.buf_y;
void* this_address = strm.next_out;
#define ZEROS_SZ 256
c3_y zeros[ZEROS_SZ];
if (leading_zeros) {
memset(zeros, 0, ZEROS_SZ);
}
while ((ret = inflate(&strm, Z_FINISH)) == Z_BUF_ERROR) {
// Output exhausted: reallocate
//
if (strm.avail_out == 0) {
strm.avail_out = chunk_w;
u3i_slab_grow(&sab_u, 3, strm.total_out + chunk_w);
strm.next_out = sab_u.buf_y + strm.total_out;
}
// Input exhausted: input leading zeros?
//
if (strm.avail_in == 0) {
if (leading_zeros) {
// Position in the stream exceeded atom bytes,
// but is still below stream length
//
if (strm.total_in + pos_w >= len_w
&& strm.total_in + pos_w < p_octs_w) {
c3_w rem_w = p_octs_w - (strm.total_in + pos_w);
strm.next_in = zeros;
if (rem_w > ZEROS_SZ) {
strm.avail_in = ZEROS_SZ;
}
else {
strm.avail_in = rem_w;
}
}
else {
u3l_log("%i", ret);
u3l_log("%s", strm.msg);
inflateEnd(&strm);
u3i_slab_free(&sab_u);
return u3m_bail(c3__exit);
}
}
else {
u3l_log("%i", ret);
u3l_log("%s", strm.msg);
inflateEnd(&strm);
u3i_slab_free(&sab_u);
return u3m_bail(c3__exit);
}
}
}
if (ret != Z_STREAM_END) {
u3l_log("%i", ret);
u3l_log("%s", strm.msg);
inflateEnd(&strm);
u3i_slab_free(&sab_u);
return u3m_bail(c3__exit);
}
ret = inflateEnd(&strm);
if (ret != Z_OK) {
u3l_log("%i", ret);
u3l_log("%s", strm.msg);
u3i_slab_free(&sab_u);
return u3m_bail(c3__exit);
}
u3_noun decompressed_octs = u3nc(strm.total_out, u3i_slab_mint(&sab_u));
u3_noun new_pos = pos_w + strm.total_in;
u3_noun new_stream = u3nc(u3i_word(new_pos), u3k(octs));
return u3nc(decompressed_octs, new_stream);
}
u3_noun
u3qe_decompress_gzip(u3_atom pos, u3_noun octs)
{
return _decompress(pos, octs, 31);
}
u3_noun
u3qe_decompress_zlib(u3_atom pos, u3_noun octs)
{
return _decompress(pos, octs, 15);
}
u3_noun
u3we_decompress_gzip(u3_noun cor)
{
u3_atom pos;
u3_noun octs;
u3_noun a = u3r_at(u3x_sam, cor);
u3x_cell(a, &pos, &octs);
if(_(u3a_is_atom(pos)) && _(u3a_is_cell(octs))) {
return u3qe_decompress_gzip(pos, octs);
}
else {
return u3m_bail(c3__exit);
}
}
u3_noun
u3we_decompress_zlib(u3_noun cor)
{
u3_atom pos;
u3_noun octs;
u3_noun a = u3r_at(u3x_sam, cor);
u3x_cell(a, &pos, &octs);
if(_(u3a_is_atom(pos)) && _(u3a_is_cell(octs))) {
return u3qe_decompress_zlib(pos, octs);
}
else {
return u3m_bail(c3__exit);
}
}
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