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#include <stdint.h>
#include "igzip_lib.h"
#include "huffman.h"
#include "huff_codes.h"
#include "bitbuf2.h"
extern const struct isal_hufftables hufftables_default;
static inline void
update_state(struct isal_zstream *stream, uint8_t *start_in, uint8_t *next_in, uint8_t *end_in)
{
struct isal_zstate *state = &stream->internal_state;
uint32_t bytes_written;
if (next_in - start_in > 0)
state->has_hist = IGZIP_HIST;
stream->next_in = next_in;
stream->total_in += next_in - start_in;
stream->avail_in = end_in - next_in;
bytes_written = buffer_used(&state->bitbuf);
stream->total_out += bytes_written;
stream->next_out += bytes_written;
stream->avail_out -= bytes_written;
}
void
isal_deflate_body_base(struct isal_zstream *stream)
{
uint32_t literal, hash;
uint8_t *start_in, *next_in, *end_in, *end, *next_hash;
uint16_t match_length;
uint32_t dist;
uint64_t code, code_len, code2, code_len2;
struct isal_zstate *state = &stream->internal_state;
uint16_t *last_seen = state->head;
uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
uint32_t hist_size = state->dist_mask;
uint32_t hash_mask = state->hash_mask;
if (stream->avail_in == 0) {
if (stream->end_of_stream || stream->flush != NO_FLUSH)
state->state = ZSTATE_FLUSH_READ_BUFFER;
return;
}
set_buf(&state->bitbuf, stream->next_out, stream->avail_out);
start_in = stream->next_in;
end_in = start_in + stream->avail_in;
next_in = start_in;
while (next_in + ISAL_LOOK_AHEAD < end_in) {
if (is_full(&state->bitbuf)) {
update_state(stream, start_in, next_in, end_in);
return;
}
literal = load_le_u32(next_in);
hash = compute_hash(literal) & hash_mask;
dist = (next_in - file_start - last_seen[hash]) & 0xFFFF;
last_seen[hash] = (uint64_t) (next_in - file_start);
/* The -1 are to handle the case when dist = 0 */
if (dist - 1 < hist_size) {
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 = load_le_u32(next_hash);
hash = compute_hash(literal) & hash_mask;
last_seen[hash] = (uint64_t) (next_hash - file_start);
}
get_len_code(stream->hufftables, match_length, &code, &code_len);
get_dist_code(stream->hufftables, dist, &code2, &code_len2);
code |= code2 << code_len;
code_len += code_len2;
write_bits(&state->bitbuf, code, code_len);
next_in += match_length;
continue;
}
}
get_lit_code(stream->hufftables, literal & 0xFF, &code, &code_len);
write_bits(&state->bitbuf, code, code_len);
next_in++;
}
update_state(stream, start_in, next_in, end_in);
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_finish_base(struct isal_zstream *stream)
{
uint32_t literal = 0, hash;
uint8_t *start_in, *next_in, *end_in, *end, *next_hash;
uint16_t match_length;
uint32_t dist;
uint64_t code, code_len, code2, code_len2;
struct isal_zstate *state = &stream->internal_state;
uint16_t *last_seen = state->head;
uint8_t *file_start = (uint8_t *) ((uintptr_t) stream->next_in - stream->total_in);
uint32_t hist_size = state->dist_mask;
uint32_t hash_mask = state->hash_mask;
set_buf(&state->bitbuf, stream->next_out, stream->avail_out);
start_in = stream->next_in;
end_in = start_in + stream->avail_in;
next_in = start_in;
if (stream->avail_in != 0) {
while (next_in + 3 < end_in) {
if (is_full(&state->bitbuf)) {
update_state(stream, start_in, next_in, end_in);
return;
}
literal = load_le_u32(next_in);
hash = compute_hash(literal) & hash_mask;
dist = (next_in - file_start - last_seen[hash]) & 0xFFFF;
last_seen[hash] = (uint64_t) (next_in - file_start);
if (dist - 1 <
hist_size) { /* 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 = load_le_u32(next_hash);
hash = compute_hash(literal) & hash_mask;
last_seen[hash] =
(uint64_t) (next_hash - file_start);
}
get_len_code(stream->hufftables, match_length, &code,
&code_len);
get_dist_code(stream->hufftables, dist, &code2, &code_len2);
code |= code2 << code_len;
code_len += code_len2;
write_bits(&state->bitbuf, code, code_len);
next_in += match_length;
continue;
}
}
get_lit_code(stream->hufftables, literal & 0xFF, &code, &code_len);
write_bits(&state->bitbuf, code, code_len);
next_in++;
}
while (next_in < end_in) {
if (is_full(&state->bitbuf)) {
update_state(stream, start_in, next_in, end_in);
return;
}
literal = *next_in;
get_lit_code(stream->hufftables, literal & 0xFF, &code, &code_len);
write_bits(&state->bitbuf, code, code_len);
next_in++;
}
}
if (!is_full(&state->bitbuf)) {
get_lit_code(stream->hufftables, 256, &code, &code_len);
write_bits(&state->bitbuf, code, code_len);
state->has_eob = 1;
if (stream->end_of_stream == 1)
state->state = ZSTATE_TRL;
else
state->state = ZSTATE_SYNC_FLUSH;
}
update_state(stream, start_in, next_in, end_in);
return;
}
void
isal_deflate_hash_base(uint16_t *hash_table, uint32_t hash_mask, uint32_t current_index,
uint8_t *dict, uint32_t dict_len)
{
uint8_t *next_in = dict;
uint8_t *end_in = dict + dict_len - SHORTEST_MATCH;
uint32_t literal;
uint32_t hash;
uint16_t index = current_index - dict_len;
while (next_in <= end_in) {
literal = load_le_u32(next_in);
hash = compute_hash(literal) & hash_mask;
hash_table[hash] = index;
index++;
next_in++;
}
}
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