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#include <stdint.h>
#include "igzip_lib.h"
#include "huffman.h"
#include "huff_codes.h"
#include "encode_df.h"
#include "igzip_level_buf_structs.h"
static inline void write_deflate_icf(struct deflate_icf *icf, uint32_t lit_len,
uint32_t lit_dist, uint32_t extra_bits)
{
icf->lit_len = lit_len;
icf->lit_dist = lit_dist;
icf->dist_extra = extra_bits;
}
static inline void update_state(struct isal_zstream *stream, uint8_t * start_in,
uint8_t * next_in, uint8_t * end_in,
struct deflate_icf *start_out, struct deflate_icf *next_out,
struct deflate_icf *end_out)
{
stream->next_in = next_in;
stream->total_in += next_in - start_in;
stream->avail_in = end_in - next_in;
((struct level_2_buf *)stream->level_buf)->icf_buf_next = next_out;
((struct level_2_buf *)stream->level_buf)->icf_buf_avail_out = end_out - next_out;
}
void isal_deflate_icf_body_base(struct isal_zstream *stream)
{
uint32_t literal, hash;
uint8_t *start_in, *next_in, *end_in, *end, *next_hash;
struct deflate_icf *start_out, *next_out, *end_out;
uint16_t match_length;
uint32_t dist;
uint32_t code, code2, extra_bits;
struct isal_zstate *state = &stream->internal_state;
uint16_t *last_seen = state->head;
if (stream->avail_in == 0) {
if (stream->end_of_stream || stream->flush != NO_FLUSH)
state->state = ZSTATE_FLUSH_READ_BUFFER;
return;
}
start_in = stream->next_in;
end_in = start_in + stream->avail_in;
next_in = start_in;
start_out = ((struct level_2_buf *)stream->level_buf)->icf_buf_next;
end_out =
start_out + ((struct level_2_buf *)stream->level_buf)->icf_buf_avail_out /
sizeof(struct deflate_icf);
next_out = start_out;
while (next_in + ISAL_LOOK_AHEAD < end_in) {
if (next_out >= end_out) {
state->state = ZSTATE_CREATE_HDR;
update_state(stream, start_in, next_in, end_in, start_out, next_out,
end_out);
return;
}
literal = *(uint32_t *) next_in;
hash = compute_hash(literal) & HASH_MASK;
dist = (next_in - state->file_start - last_seen[hash]) & 0xFFFF;
last_seen[hash] = (uint64_t) (next_in - state->file_start);
/* The -1 are to handle the case when dist = 0 */
if (dist - 1 < IGZIP_HIST_SIZE - 1) {
assert(dist != 0);
match_length = compare258(next_in - dist, next_in, 258);
if (match_length >= SHORTEST_MATCH) {
next_hash = next_in;
#ifdef ISAL_LIMIT_HASH_UPDATE
end = next_hash + 3;
#else
end = next_hash + match_length;
#endif
next_hash++;
for (; next_hash < end; next_hash++) {
literal = *(uint32_t *) next_hash;
hash = compute_hash(literal) & HASH_MASK;
last_seen[hash] =
(uint64_t) (next_hash - state->file_start);
}
get_len_icf_code(match_length, &code);
get_dist_icf_code(dist, &code2, &extra_bits);
state->hist.ll_hist[code]++;
state->hist.d_hist[code2]++;
write_deflate_icf(next_out, code, code2, extra_bits);
next_out++;
next_in += match_length;
continue;
}
}
get_lit_icf_code(literal & 0xFF, &code);
state->hist.ll_hist[code]++;
write_deflate_icf(next_out, code, NULL_DIST_SYM, 0);
next_out++;
next_in++;
}
update_state(stream, start_in, next_in, end_in, start_out, next_out, end_out);
assert(stream->avail_in <= ISAL_LOOK_AHEAD);
if (stream->end_of_stream || stream->flush != NO_FLUSH)
state->state = ZSTATE_FLUSH_READ_BUFFER;
return;
}
void isal_deflate_icf_finish_base(struct isal_zstream *stream)
{
uint32_t literal = 0, hash;
uint8_t *start_in, *next_in, *end_in, *end, *next_hash;
struct deflate_icf *start_out, *next_out, *end_out;
uint16_t match_length;
uint32_t dist;
uint32_t code, code2, extra_bits;
struct isal_zstate *state = &stream->internal_state;
uint16_t *last_seen = state->head;
start_in = stream->next_in;
end_in = start_in + stream->avail_in;
next_in = start_in;
start_out = ((struct level_2_buf *)stream->level_buf)->icf_buf_next;
end_out = start_out + ((struct level_2_buf *)stream->level_buf)->icf_buf_avail_out /
sizeof(struct deflate_icf);
next_out = start_out;
while (next_in + 3 < end_in) {
if (next_out >= end_out) {
state->state = ZSTATE_CREATE_HDR;
update_state(stream, start_in, next_in, end_in, start_out, next_out,
end_out);
return;
}
literal = *(uint32_t *) next_in;
hash = compute_hash(literal) & HASH_MASK;
dist = (next_in - state->file_start - last_seen[hash]) & 0xFFFF;
last_seen[hash] = (uint64_t) (next_in - state->file_start);
if (dist - 1 < IGZIP_HIST_SIZE - 1) { /* The -1 are to handle the case when dist = 0 */
match_length = compare258(next_in - dist, next_in, end_in - next_in);
if (match_length >= SHORTEST_MATCH) {
next_hash = next_in;
#ifdef ISAL_LIMIT_HASH_UPDATE
end = next_hash + 3;
#else
end = next_hash + match_length;
#endif
next_hash++;
for (; next_hash < end - 3; next_hash++) {
literal = *(uint32_t *) next_hash;
hash = compute_hash(literal) & HASH_MASK;
last_seen[hash] =
(uint64_t) (next_hash - state->file_start);
}
get_len_icf_code(match_length, &code);
get_dist_icf_code(dist, &code2, &extra_bits);
state->hist.ll_hist[code]++;
state->hist.d_hist[code2]++;
write_deflate_icf(next_out, code, code2, extra_bits);
next_out++;
next_in += match_length;
continue;
}
}
get_lit_icf_code(literal & 0xFF, &code);
state->hist.ll_hist[code]++;
write_deflate_icf(next_out, code, NULL_DIST_SYM, 0);
next_out++;
next_in++;
}
while (next_in < end_in) {
if (next_out >= end_out) {
state->state = ZSTATE_CREATE_HDR;
update_state(stream, start_in, next_in, end_in, start_out, next_out,
end_out);
return;
}
literal = *next_in;
get_lit_icf_code(literal & 0xFF, &code);
state->hist.ll_hist[code]++;
write_deflate_icf(next_out, code, NULL_DIST_SYM, 0);
next_out++;
next_in++;
}
if (next_in == end_in) {
if (stream->end_of_stream || stream->flush != NO_FLUSH)
state->state = ZSTATE_CREATE_HDR;
}
update_state(stream, start_in, next_in, end_in, start_out, next_out, end_out);
return;
}
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