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-rw-r--r--src/isa-l/igzip/igzip_base.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/src/isa-l/igzip/igzip_base.c b/src/isa-l/igzip/igzip_base.c
new file mode 100644
index 000000000..bcc965f6d
--- /dev/null
+++ b/src/isa-l/igzip/igzip_base.c
@@ -0,0 +1,236 @@
+#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_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_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_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_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_u32(next_in);
+ hash = compute_hash(literal) & hash_mask;
+ hash_table[hash] = index;
+ index++;
+ next_in++;
+ }
+}
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