842_compress.c (01b944fe1cd4e21a2a9ed51adbdbafe2d5e905ba) 842_compress.c (ea0b3984c1cc8b28de27a3bec285102b4e366a4c)
1/*
2 * 842 Software Compression
3 *
4 * Copyright (C) 2015 Dan Streetman, IBM Corp
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or

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485 */
486int sw842_compress(const u8 *in, unsigned int ilen,
487 u8 *out, unsigned int *olen, void *wmem)
488{
489 struct sw842_param *p = (struct sw842_param *)wmem;
490 int ret;
491 u64 last, next, pad, total;
492 u8 repeat_count = 0;
1/*
2 * 842 Software Compression
3 *
4 * Copyright (C) 2015 Dan Streetman, IBM Corp
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or

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485 */
486int sw842_compress(const u8 *in, unsigned int ilen,
487 u8 *out, unsigned int *olen, void *wmem)
488{
489 struct sw842_param *p = (struct sw842_param *)wmem;
490 int ret;
491 u64 last, next, pad, total;
492 u8 repeat_count = 0;
493 u32 crc;
493
494 BUILD_BUG_ON(sizeof(*p) > SW842_MEM_COMPRESS);
495
496 init_hashtable_nodes(p, 8);
497 init_hashtable_nodes(p, 4);
498 init_hashtable_nodes(p, 2);
499
500 p->in = (u8 *)in;

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575 p->in += p->ilen;
576 p->ilen = 0;
577 }
578
579 ret = add_end_template(p);
580 if (ret)
581 return ret;
582
494
495 BUILD_BUG_ON(sizeof(*p) > SW842_MEM_COMPRESS);
496
497 init_hashtable_nodes(p, 8);
498 init_hashtable_nodes(p, 4);
499 init_hashtable_nodes(p, 2);
500
501 p->in = (u8 *)in;

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576 p->in += p->ilen;
577 p->ilen = 0;
578 }
579
580 ret = add_end_template(p);
581 if (ret)
582 return ret;
583
584 /*
585 * crc(0:31) is appended to target data starting with the next
586 * bit after End of stream template.
587 * nx842 calculates CRC for data in big-endian format. So doing
588 * same here so that sw842 decompression can be used for both
589 * compressed data.
590 */
591 crc = crc32_be(0, in, ilen);
592 ret = add_bits(p, crc, CRC_BITS);
593 if (ret)
594 return ret;
595
583 if (p->bit) {
584 p->out++;
585 p->olen--;
586 p->bit = 0;
587 }
588
589 /* pad compressed length to multiple of 8 */
590 pad = (8 - ((total - p->olen) % 8)) % 8;

--- 36 unchanged lines hidden --- 		596 if (p->bit) {
597 p->out++;
598 p->olen--;
599 p->bit = 0;
600 }
601
602 /* pad compressed length to multiple of 8 */
603 pad = (8 - ((total - p->olen) % 8)) % 8;

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