835 lines
19 KiB
Diff
835 lines
19 KiB
Diff
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--- /dev/null
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+++ b/crypto/unlzma.c
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@@ -0,0 +1,723 @@
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+/*
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+ * LZMA uncompresion module for pcomp
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+ * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
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+ *
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+ * Based on:
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+ * Initial Linux kernel adaptation
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+ * Copyright (C) 2006 Alain < alain@knaff.lu >
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+ *
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+ * Based on small lzma deflate implementation/Small range coder
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+ * implementation for lzma.
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+ * Copyright (C) 2006 Aurelien Jacobs < aurel@gnuage.org >
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+ *
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+ * Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
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+ * Copyright (C) 1999-2005 Igor Pavlov
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * FIXME: the current implementation assumes that the caller will
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+ * not free any output buffers until the whole decompression has been
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+ * completed. This is necessary, because LZMA looks back at old output
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+ * instead of doing a separate dictionary allocation, which saves RAM.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/vmalloc.h>
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+#include <linux/interrupt.h>
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+#include <linux/mm.h>
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+#include <linux/net.h>
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+#include <linux/slab.h>
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+#include <linux/kthread.h>
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+
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+#include <crypto/internal/compress.h>
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+#include "unlzma.h"
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+
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+static int instance = 0;
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+
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+struct unlzma_buffer {
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+ struct unlzma_buffer *last;
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+ int offset;
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+ int size;
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+ u8 *ptr;
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+};
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+
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+struct unlzma_ctx {
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+ struct task_struct *thread;
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+ wait_queue_head_t next_req;
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+ struct mutex mutex;
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+ bool active;
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+ bool cancel;
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+
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+ const u8 *next_in;
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+ int avail_in;
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+
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+ u8 *next_out;
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+ int avail_out;
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+
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+ /* reader state */
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+ u32 code;
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+ u32 range;
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+ u32 bound;
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+
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+ /* writer state */
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+ u8 previous_byte;
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+ ssize_t pos;
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+ struct unlzma_buffer *head;
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+ int buf_full;
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+
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+ /* cstate */
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+ int state;
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+ u32 rep0, rep1, rep2, rep3;
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+
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+ u32 dict_size;
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+
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+ void *workspace;
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+ int workspace_size;
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+};
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+
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+static inline bool
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+unlzma_should_stop(struct unlzma_ctx *ctx)
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+{
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+ return unlikely(kthread_should_stop() || ctx->cancel);
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+}
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+
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+static void
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+get_buffer(struct unlzma_ctx *ctx)
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+{
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+ struct unlzma_buffer *bh;
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+
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+ bh = kzalloc(sizeof(struct unlzma_buffer), GFP_KERNEL);
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+ bh->ptr = ctx->next_out;
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+ bh->offset = ctx->pos;
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+ bh->last = ctx->head;
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+ bh->size = ctx->avail_out;
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+ ctx->head = bh;
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+ ctx->buf_full = 0;
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+}
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+
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+static void
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+unlzma_request_buffer(struct unlzma_ctx *ctx, int *avail)
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+{
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+ do {
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+ mutex_unlock(&ctx->mutex);
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+ if (wait_event_interruptible(ctx->next_req,
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+ unlzma_should_stop(ctx) || (*avail > 0)))
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+ schedule();
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+ mutex_lock(&ctx->mutex);
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+ } while (*avail <= 0 && !unlzma_should_stop(ctx));
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+
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+ if (!unlzma_should_stop(ctx) && ctx->buf_full)
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+ get_buffer(ctx);
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+}
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+
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+static u8
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+rc_read(struct unlzma_ctx *ctx)
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+{
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+ if (unlikely(ctx->avail_in <= 0))
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+ unlzma_request_buffer(ctx, &ctx->avail_in);
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+
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+ if (unlzma_should_stop(ctx))
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+ return 0;
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+
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+ ctx->avail_in--;
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+ return *(ctx->next_in++);
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+}
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+
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+
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+static inline void
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+rc_get_code(struct unlzma_ctx *ctx)
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+{
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+ ctx->code = (ctx->code << 8) | rc_read(ctx);
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+}
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+
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+static void
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+rc_normalize(struct unlzma_ctx *ctx)
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+{
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+ if (ctx->range < (1 << RC_TOP_BITS)) {
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+ ctx->range <<= 8;
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+ rc_get_code(ctx);
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+ }
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+}
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+
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+static int
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+rc_is_bit_0(struct unlzma_ctx *ctx, u16 *p)
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+{
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+ rc_normalize(ctx);
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+ ctx->bound = *p * (ctx->range >> RC_MODEL_TOTAL_BITS);
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+ return ctx->code < ctx->bound;
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+}
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+
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+static void
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+rc_update_bit_0(struct unlzma_ctx *ctx, u16 *p)
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+{
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+ ctx->range = ctx->bound;
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+ *p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
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+}
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+
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+static void
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+rc_update_bit_1(struct unlzma_ctx *ctx, u16 *p)
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+{
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+ ctx->range -= ctx->bound;
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+ ctx->code -= ctx->bound;
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+ *p -= *p >> RC_MOVE_BITS;
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+}
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+
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+static bool
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+rc_get_bit(struct unlzma_ctx *ctx, u16 *p, int *symbol)
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+{
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+ if (rc_is_bit_0(ctx, p)) {
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+ rc_update_bit_0(ctx, p);
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+ *symbol *= 2;
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+ return 0;
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+ } else {
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+ rc_update_bit_1(ctx, p);
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+ *symbol = *symbol * 2 + 1;
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+ return 1;
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+ }
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+}
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+
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+static int
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+rc_direct_bit(struct unlzma_ctx *ctx)
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+{
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+ rc_normalize(ctx);
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+ ctx->range >>= 1;
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+ if (ctx->code >= ctx->range) {
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+ ctx->code -= ctx->range;
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+ return 1;
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+ }
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+ return 0;
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+}
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+
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+static void
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+rc_bit_tree_decode(struct unlzma_ctx *ctx, u16 *p, int num_levels, int *symbol)
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+{
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+ int i = num_levels;
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+
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+ *symbol = 1;
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+ while (i--)
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+ rc_get_bit(ctx, p + *symbol, symbol);
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+ *symbol -= 1 << num_levels;
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+}
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+
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+static u8
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+peek_old_byte(struct unlzma_ctx *ctx, u32 offs)
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+{
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+ struct unlzma_buffer *bh = ctx->head;
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+ u32 pos;
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+
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+ pos = ctx->pos - offs;
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+ if (pos >= ctx->dict_size) {
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+ pos = (~pos % ctx->dict_size);
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+ }
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+
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+ while (bh->offset > pos) {
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+ bh = bh->last;
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+ BUG_ON(!bh);
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+ }
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+
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+ pos -= bh->offset;
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+ BUG_ON(pos >= bh->size);
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+
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+ return bh->ptr[pos];
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+}
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+
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+static void
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+write_byte(struct unlzma_ctx *ctx, u8 byte)
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+{
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+ if (unlikely(ctx->avail_out <= 0)) {
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+ unlzma_request_buffer(ctx, &ctx->avail_out);
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+ }
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+
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+ if (!ctx->avail_out)
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+ return;
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+
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+ ctx->previous_byte = byte;
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+ *(ctx->next_out++) = byte;
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+ ctx->avail_out--;
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+ if (ctx->avail_out == 0)
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+ ctx->buf_full = 1;
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+ ctx->pos++;
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+}
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+
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+
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+static inline void
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+copy_byte(struct unlzma_ctx *ctx, u32 offs)
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+{
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+ write_byte(ctx, peek_old_byte(ctx, offs));
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+}
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+
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+static void
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+copy_bytes(struct unlzma_ctx *ctx, u32 rep0, int len)
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+{
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+ do {
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+ copy_byte(ctx, rep0);
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+ len--;
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+ if (unlzma_should_stop(ctx))
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+ break;
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+ } while (len != 0);
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+}
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+
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+static void
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+process_bit0(struct unlzma_ctx *ctx, u16 *p, int pos_state, u16 *prob,
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+ int lc, u32 literal_pos_mask)
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+{
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+ int mi = 1;
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+ rc_update_bit_0(ctx, prob);
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+ prob = (p + LZMA_LITERAL +
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+ (LZMA_LIT_SIZE
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+ * (((ctx->pos & literal_pos_mask) << lc)
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+ + (ctx->previous_byte >> (8 - lc))))
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+ );
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+
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+ if (ctx->state >= LZMA_NUM_LIT_STATES) {
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+ int match_byte = peek_old_byte(ctx, ctx->rep0);
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+ do {
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+ u16 bit;
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+ u16 *prob_lit;
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+
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+ match_byte <<= 1;
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+ bit = match_byte & 0x100;
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+ prob_lit = prob + 0x100 + bit + mi;
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+ if (rc_get_bit(ctx, prob_lit, &mi) != !!bit)
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+ break;
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+ } while (mi < 0x100);
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+ }
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+ while (mi < 0x100) {
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+ u16 *prob_lit = prob + mi;
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+ rc_get_bit(ctx, prob_lit, &mi);
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+ }
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+ write_byte(ctx, mi);
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+ if (ctx->state < 4)
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+ ctx->state = 0;
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+ else if (ctx->state < 10)
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+ ctx->state -= 3;
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+ else
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+ ctx->state -= 6;
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+}
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+
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+static void
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+process_bit1(struct unlzma_ctx *ctx, u16 *p, int pos_state, u16 *prob)
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+{
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+ int offset;
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+ u16 *prob_len;
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+ int num_bits;
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+ int len;
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+
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+ rc_update_bit_1(ctx, prob);
|
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+ prob = p + LZMA_IS_REP + ctx->state;
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+ if (rc_is_bit_0(ctx, prob)) {
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+ rc_update_bit_0(ctx, prob);
|
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+ ctx->rep3 = ctx->rep2;
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+ ctx->rep2 = ctx->rep1;
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+ ctx->rep1 = ctx->rep0;
|
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+ ctx->state = ctx->state < LZMA_NUM_LIT_STATES ? 0 : 3;
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+ prob = p + LZMA_LEN_CODER;
|
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|
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+ } else {
|
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|
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+ rc_update_bit_1(ctx, prob);
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|
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+ prob = p + LZMA_IS_REP_G0 + ctx->state;
|
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+ if (rc_is_bit_0(ctx, prob)) {
|
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+ rc_update_bit_0(ctx, prob);
|
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|
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+ prob = (p + LZMA_IS_REP_0_LONG
|
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|
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+ + (ctx->state <<
|
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|
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+ LZMA_NUM_POS_BITS_MAX) +
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+ pos_state);
|
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|
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+ if (rc_is_bit_0(ctx, prob)) {
|
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|
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+ rc_update_bit_0(ctx, prob);
|
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|
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+
|
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|
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+ ctx->state = ctx->state < LZMA_NUM_LIT_STATES ?
|
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+ 9 : 11;
|
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+ copy_byte(ctx, ctx->rep0);
|
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+ return;
|
||
|
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+ } else {
|
||
|
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+ rc_update_bit_1(ctx, prob);
|
||
|
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+ }
|
||
|
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+ } else {
|
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|
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+ u32 distance;
|
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|
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+
|
||
|
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+ rc_update_bit_1(ctx, prob);
|
||
|
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+ prob = p + LZMA_IS_REP_G1 + ctx->state;
|
||
|
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+ if (rc_is_bit_0(ctx, prob)) {
|
||
|
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+ rc_update_bit_0(ctx, prob);
|
||
|
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+ distance = ctx->rep1;
|
||
|
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+ } else {
|
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|
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+ rc_update_bit_1(ctx, prob);
|
||
|
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+ prob = p + LZMA_IS_REP_G2 + ctx->state;
|
||
|
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+ if (rc_is_bit_0(ctx, prob)) {
|
||
|
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+ rc_update_bit_0(ctx, prob);
|
||
|
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+ distance = ctx->rep2;
|
||
|
|
+ } else {
|
||
|
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+ rc_update_bit_1(ctx, prob);
|
||
|
|
+ distance = ctx->rep3;
|
||
|
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+ ctx->rep3 = ctx->rep2;
|
||
|
|
+ }
|
||
|
|
+ ctx->rep2 = ctx->rep1;
|
||
|
|
+ }
|
||
|
|
+ ctx->rep1 = ctx->rep0;
|
||
|
|
+ ctx->rep0 = distance;
|
||
|
|
+ }
|
||
|
|
+ ctx->state = ctx->state < LZMA_NUM_LIT_STATES ? 8 : 11;
|
||
|
|
+ prob = p + LZMA_REP_LEN_CODER;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ prob_len = prob + LZMA_LEN_CHOICE;
|
||
|
|
+ if (rc_is_bit_0(ctx, prob_len)) {
|
||
|
|
+ rc_update_bit_0(ctx, prob_len);
|
||
|
|
+ prob_len = (prob + LZMA_LEN_LOW
|
||
|
|
+ + (pos_state <<
|
||
|
|
+ LZMA_LEN_NUM_LOW_BITS));
|
||
|
|
+ offset = 0;
|
||
|
|
+ num_bits = LZMA_LEN_NUM_LOW_BITS;
|
||
|
|
+ } else {
|
||
|
|
+ rc_update_bit_1(ctx, prob_len);
|
||
|
|
+ prob_len = prob + LZMA_LEN_CHOICE_2;
|
||
|
|
+ if (rc_is_bit_0(ctx, prob_len)) {
|
||
|
|
+ rc_update_bit_0(ctx, prob_len);
|
||
|
|
+ prob_len = (prob + LZMA_LEN_MID
|
||
|
|
+ + (pos_state <<
|
||
|
|
+ LZMA_LEN_NUM_MID_BITS));
|
||
|
|
+ offset = 1 << LZMA_LEN_NUM_LOW_BITS;
|
||
|
|
+ num_bits = LZMA_LEN_NUM_MID_BITS;
|
||
|
|
+ } else {
|
||
|
|
+ rc_update_bit_1(ctx, prob_len);
|
||
|
|
+ prob_len = prob + LZMA_LEN_HIGH;
|
||
|
|
+ offset = ((1 << LZMA_LEN_NUM_LOW_BITS)
|
||
|
|
+ + (1 << LZMA_LEN_NUM_MID_BITS));
|
||
|
|
+ num_bits = LZMA_LEN_NUM_HIGH_BITS;
|
||
|
|
+ }
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ rc_bit_tree_decode(ctx, prob_len, num_bits, &len);
|
||
|
|
+ len += offset;
|
||
|
|
+
|
||
|
|
+ if (ctx->state < 4) {
|
||
|
|
+ int pos_slot;
|
||
|
|
+
|
||
|
|
+ ctx->state += LZMA_NUM_LIT_STATES;
|
||
|
|
+ prob =
|
||
|
|
+ p + LZMA_POS_SLOT +
|
||
|
|
+ ((len <
|
||
|
|
+ LZMA_NUM_LEN_TO_POS_STATES ? len :
|
||
|
|
+ LZMA_NUM_LEN_TO_POS_STATES - 1)
|
||
|
|
+ << LZMA_NUM_POS_SLOT_BITS);
|
||
|
|
+ rc_bit_tree_decode(ctx, prob,
|
||
|
|
+ LZMA_NUM_POS_SLOT_BITS,
|
||
|
|
+ &pos_slot);
|
||
|
|
+ if (pos_slot >= LZMA_START_POS_MODEL_INDEX) {
|
||
|
|
+ int i, mi;
|
||
|
|
+ num_bits = (pos_slot >> 1) - 1;
|
||
|
|
+ ctx->rep0 = 2 | (pos_slot & 1);
|
||
|
|
+ if (pos_slot < LZMA_END_POS_MODEL_INDEX) {
|
||
|
|
+ ctx->rep0 <<= num_bits;
|
||
|
|
+ prob = p + LZMA_SPEC_POS +
|
||
|
|
+ ctx->rep0 - pos_slot - 1;
|
||
|
|
+ } else {
|
||
|
|
+ num_bits -= LZMA_NUM_ALIGN_BITS;
|
||
|
|
+ while (num_bits--)
|
||
|
|
+ ctx->rep0 = (ctx->rep0 << 1) |
|
||
|
|
+ rc_direct_bit(ctx);
|
||
|
|
+ prob = p + LZMA_ALIGN;
|
||
|
|
+ ctx->rep0 <<= LZMA_NUM_ALIGN_BITS;
|
||
|
|
+ num_bits = LZMA_NUM_ALIGN_BITS;
|
||
|
|
+ }
|
||
|
|
+ i = 1;
|
||
|
|
+ mi = 1;
|
||
|
|
+ while (num_bits--) {
|
||
|
|
+ if (rc_get_bit(ctx, prob + mi, &mi))
|
||
|
|
+ ctx->rep0 |= i;
|
||
|
|
+ i <<= 1;
|
||
|
|
+ }
|
||
|
|
+ } else
|
||
|
|
+ ctx->rep0 = pos_slot;
|
||
|
|
+ if (++(ctx->rep0) == 0)
|
||
|
|
+ return;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ len += LZMA_MATCH_MIN_LEN;
|
||
|
|
+
|
||
|
|
+ copy_bytes(ctx, ctx->rep0, len);
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+
|
||
|
|
+static int
|
||
|
|
+do_unlzma(struct unlzma_ctx *ctx)
|
||
|
|
+{
|
||
|
|
+ u8 hdr_buf[sizeof(struct lzma_header)];
|
||
|
|
+ struct lzma_header *header = (struct lzma_header *)hdr_buf;
|
||
|
|
+ u32 pos_state_mask;
|
||
|
|
+ u32 literal_pos_mask;
|
||
|
|
+ int lc, pb, lp;
|
||
|
|
+ int num_probs;
|
||
|
|
+ int i, mi;
|
||
|
|
+ u16 *p;
|
||
|
|
+
|
||
|
|
+ for (i = 0; i < sizeof(struct lzma_header); i++) {
|
||
|
|
+ hdr_buf[i] = rc_read(ctx);
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ ctx->pos = 0;
|
||
|
|
+ get_buffer(ctx);
|
||
|
|
+ ctx->active = true;
|
||
|
|
+ ctx->state = 0;
|
||
|
|
+ ctx->rep0 = ctx->rep1 = ctx->rep2 = ctx->rep3 = 1;
|
||
|
|
+
|
||
|
|
+ ctx->previous_byte = 0;
|
||
|
|
+ ctx->code = 0;
|
||
|
|
+ ctx->range = 0xFFFFFFFF;
|
||
|
|
+
|
||
|
|
+ ctx->dict_size = le32_to_cpu(header->dict_size);
|
||
|
|
+
|
||
|
|
+ if (header->pos >= (9 * 5 * 5))
|
||
|
|
+ return -1;
|
||
|
|
+
|
||
|
|
+ mi = 0;
|
||
|
|
+ lc = header->pos;
|
||
|
|
+ while (lc >= 9) {
|
||
|
|
+ mi++;
|
||
|
|
+ lc -= 9;
|
||
|
|
+ }
|
||
|
|
+ pb = 0;
|
||
|
|
+ lp = mi;
|
||
|
|
+ while (lp >= 5) {
|
||
|
|
+ pb++;
|
||
|
|
+ lp -= 5;
|
||
|
|
+ }
|
||
|
|
+ pos_state_mask = (1 << pb) - 1;
|
||
|
|
+ literal_pos_mask = (1 << lp) - 1;
|
||
|
|
+
|
||
|
|
+ if (ctx->dict_size == 0)
|
||
|
|
+ ctx->dict_size = 1;
|
||
|
|
+
|
||
|
|
+ num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp));
|
||
|
|
+ if (ctx->workspace_size < num_probs * sizeof(*p)) {
|
||
|
|
+ if (ctx->workspace)
|
||
|
|
+ vfree(ctx->workspace);
|
||
|
|
+ ctx->workspace_size = num_probs * sizeof(*p);
|
||
|
|
+ ctx->workspace = vmalloc(ctx->workspace_size);
|
||
|
|
+ }
|
||
|
|
+ p = (u16 *) ctx->workspace;
|
||
|
|
+ if (!p)
|
||
|
|
+ return -1;
|
||
|
|
+
|
||
|
|
+ num_probs = LZMA_LITERAL + (LZMA_LIT_SIZE << (lc + lp));
|
||
|
|
+ for (i = 0; i < num_probs; i++)
|
||
|
|
+ p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
|
||
|
|
+
|
||
|
|
+ for (i = 0; i < 5; i++)
|
||
|
|
+ rc_get_code(ctx);
|
||
|
|
+
|
||
|
|
+ while (1) {
|
||
|
|
+ int pos_state = ctx->pos & pos_state_mask;
|
||
|
|
+ u16 *prob = p + LZMA_IS_MATCH +
|
||
|
|
+ (ctx->state << LZMA_NUM_POS_BITS_MAX) + pos_state;
|
||
|
|
+ if (rc_is_bit_0(ctx, prob))
|
||
|
|
+ process_bit0(ctx, p, pos_state, prob,
|
||
|
|
+ lc, literal_pos_mask);
|
||
|
|
+ else {
|
||
|
|
+ process_bit1(ctx, p, pos_state, prob);
|
||
|
|
+ if (ctx->rep0 == 0)
|
||
|
|
+ break;
|
||
|
|
+ }
|
||
|
|
+ if (unlzma_should_stop(ctx))
|
||
|
|
+ break;
|
||
|
|
+ }
|
||
|
|
+ if (likely(!unlzma_should_stop(ctx)))
|
||
|
|
+ rc_normalize(ctx);
|
||
|
|
+
|
||
|
|
+ return ctx->pos;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+
|
||
|
|
+static void
|
||
|
|
+unlzma_reset_buf(struct unlzma_ctx *ctx)
|
||
|
|
+{
|
||
|
|
+ ctx->avail_in = 0;
|
||
|
|
+ ctx->next_in = NULL;
|
||
|
|
+ ctx->avail_out = 0;
|
||
|
|
+ ctx->next_out = NULL;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static int
|
||
|
|
+unlzma_thread(void *data)
|
||
|
|
+{
|
||
|
|
+ struct unlzma_ctx *ctx = data;
|
||
|
|
+
|
||
|
|
+ mutex_lock(&ctx->mutex);
|
||
|
|
+ do {
|
||
|
|
+ if (do_unlzma(ctx) < 0)
|
||
|
|
+ ctx->pos = 0;
|
||
|
|
+ unlzma_reset_buf(ctx);
|
||
|
|
+ ctx->cancel = false;
|
||
|
|
+ ctx->active = false;
|
||
|
|
+ while (ctx->head) {
|
||
|
|
+ struct unlzma_buffer *bh = ctx->head;
|
||
|
|
+ ctx->head = bh->last;
|
||
|
|
+ kfree(bh);
|
||
|
|
+ }
|
||
|
|
+ } while (!kthread_should_stop());
|
||
|
|
+ mutex_unlock(&ctx->mutex);
|
||
|
|
+ return 0;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+
|
||
|
|
+static int
|
||
|
|
+unlzma_init(struct crypto_tfm *tfm)
|
||
|
|
+{
|
||
|
|
+ return 0;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static void
|
||
|
|
+unlzma_cancel(struct unlzma_ctx *ctx)
|
||
|
|
+{
|
||
|
|
+ unlzma_reset_buf(ctx);
|
||
|
|
+
|
||
|
|
+ if (!ctx->active)
|
||
|
|
+ return;
|
||
|
|
+
|
||
|
|
+ ctx->cancel = true;
|
||
|
|
+ do {
|
||
|
|
+ mutex_unlock(&ctx->mutex);
|
||
|
|
+ wake_up(&ctx->next_req);
|
||
|
|
+ schedule();
|
||
|
|
+ mutex_lock(&ctx->mutex);
|
||
|
|
+ } while (ctx->cancel);
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+
|
||
|
|
+static void
|
||
|
|
+unlzma_exit(struct crypto_tfm *tfm)
|
||
|
|
+{
|
||
|
|
+ struct unlzma_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
+
|
||
|
|
+ if (ctx->thread) {
|
||
|
|
+ unlzma_cancel(ctx);
|
||
|
|
+ kthread_stop(ctx->thread);
|
||
|
|
+ ctx->thread = NULL;
|
||
|
|
+ }
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static int
|
||
|
|
+unlzma_decompress_setup(struct crypto_pcomp *tfm, void *p, unsigned int len)
|
||
|
|
+{
|
||
|
|
+ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
|
||
|
|
+ int ret = 0;
|
||
|
|
+
|
||
|
|
+ if (ctx->thread)
|
||
|
|
+ return 0;
|
||
|
|
+
|
||
|
|
+ mutex_init(&ctx->mutex);
|
||
|
|
+ init_waitqueue_head(&ctx->next_req);
|
||
|
|
+ ctx->thread = kthread_run(unlzma_thread, ctx, "unlzma/%d", instance++);
|
||
|
|
+ if (IS_ERR(ctx->thread)) {
|
||
|
|
+ ret = PTR_ERR(ctx->thread);
|
||
|
|
+ ctx->thread = NULL;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ return ret;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static int
|
||
|
|
+unlzma_decompress_init(struct crypto_pcomp *tfm)
|
||
|
|
+{
|
||
|
|
+ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
|
||
|
|
+
|
||
|
|
+ ctx->pos = 0;
|
||
|
|
+ return 0;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static void
|
||
|
|
+unlzma_wait_complete(struct unlzma_ctx *ctx, bool finish)
|
||
|
|
+{
|
||
|
|
+ do {
|
||
|
|
+ mutex_unlock(&ctx->mutex);
|
||
|
|
+ wake_up(&ctx->next_req);
|
||
|
|
+ schedule();
|
||
|
|
+ mutex_lock(&ctx->mutex);
|
||
|
|
+ } while (ctx->active && (ctx->avail_in > 0) && (ctx->avail_out > 0));
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static int
|
||
|
|
+unlzma_decompress_update(struct crypto_pcomp *tfm, struct comp_request *req)
|
||
|
|
+{
|
||
|
|
+ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
|
||
|
|
+ size_t pos = 0;
|
||
|
|
+
|
||
|
|
+ mutex_lock(&ctx->mutex);
|
||
|
|
+ if (!ctx->active && !req->avail_in)
|
||
|
|
+ goto out;
|
||
|
|
+
|
||
|
|
+ pos = ctx->pos;
|
||
|
|
+ ctx->next_in = req->next_in;
|
||
|
|
+ ctx->avail_in = req->avail_in;
|
||
|
|
+ ctx->next_out = req->next_out;
|
||
|
|
+ ctx->avail_out = req->avail_out;
|
||
|
|
+
|
||
|
|
+ unlzma_wait_complete(ctx, false);
|
||
|
|
+
|
||
|
|
+ req->next_in = ctx->next_in;
|
||
|
|
+ req->avail_in = ctx->avail_in;
|
||
|
|
+ req->next_out = ctx->next_out;
|
||
|
|
+ req->avail_out = ctx->avail_out;
|
||
|
|
+ ctx->next_in = 0;
|
||
|
|
+ ctx->avail_in = 0;
|
||
|
|
+ pos = ctx->pos - pos;
|
||
|
|
+
|
||
|
|
+out:
|
||
|
|
+ mutex_unlock(&ctx->mutex);
|
||
|
|
+ return pos;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static int
|
||
|
|
+unlzma_decompress_final(struct crypto_pcomp *tfm, struct comp_request *req)
|
||
|
|
+{
|
||
|
|
+ struct unlzma_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
|
||
|
|
+ int ret = 0;
|
||
|
|
+
|
||
|
|
+ /* cancel pending operation */
|
||
|
|
+ mutex_lock(&ctx->mutex);
|
||
|
|
+ if (ctx->active) {
|
||
|
|
+ // ret = -EINVAL;
|
||
|
|
+ unlzma_cancel(ctx);
|
||
|
|
+ }
|
||
|
|
+ ctx->pos = 0;
|
||
|
|
+ mutex_unlock(&ctx->mutex);
|
||
|
|
+ return ret;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+
|
||
|
|
+static struct pcomp_alg unlzma_alg = {
|
||
|
|
+ .decompress_setup = unlzma_decompress_setup,
|
||
|
|
+ .decompress_init = unlzma_decompress_init,
|
||
|
|
+ .decompress_update = unlzma_decompress_update,
|
||
|
|
+ .decompress_final = unlzma_decompress_final,
|
||
|
|
+
|
||
|
|
+ .base = {
|
||
|
|
+ .cra_name = "lzma",
|
||
|
|
+ .cra_flags = CRYPTO_ALG_TYPE_PCOMPRESS,
|
||
|
|
+ .cra_ctxsize = sizeof(struct unlzma_ctx),
|
||
|
|
+ .cra_module = THIS_MODULE,
|
||
|
|
+ .cra_init = unlzma_init,
|
||
|
|
+ .cra_exit = unlzma_exit,
|
||
|
|
+ }
|
||
|
|
+};
|
||
|
|
+
|
||
|
|
+static int __init
|
||
|
|
+unlzma_mod_init(void)
|
||
|
|
+{
|
||
|
|
+ return crypto_register_pcomp(&unlzma_alg);
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static void __exit
|
||
|
|
+unlzma_mod_exit(void)
|
||
|
|
+{
|
||
|
|
+ crypto_unregister_pcomp(&unlzma_alg);
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+module_init(unlzma_mod_init);
|
||
|
|
+module_exit(unlzma_mod_exit);
|
||
|
|
+
|
||
|
|
+MODULE_LICENSE("GPL");
|
||
|
|
+MODULE_DESCRIPTION("LZMA Decompression Algorithm");
|
||
|
|
+MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
|
||
|
|
--- a/crypto/Kconfig
|
||
|
|
+++ b/crypto/Kconfig
|
||
|
|
@@ -768,6 +768,12 @@ config CRYPTO_ZLIB
|
||
|
|
help
|
||
|
|
This is the zlib algorithm.
|
||
|
|
|
||
|
|
+config CRYPTO_UNLZMA
|
||
|
|
+ tristate "LZMA decompression"
|
||
|
|
+ select CRYPTO_PCOMP
|
||
|
|
+ help
|
||
|
|
+ This is the lzma decompression module.
|
||
|
|
+
|
||
|
|
config CRYPTO_LZO
|
||
|
|
tristate "LZO compression algorithm"
|
||
|
|
select CRYPTO_ALGAPI
|
||
|
|
--- a/crypto/Makefile
|
||
|
|
+++ b/crypto/Makefile
|
||
|
|
@@ -75,6 +75,7 @@ obj-$(CONFIG_CRYPTO_SEED) += seed.o
|
||
|
|
obj-$(CONFIG_CRYPTO_SALSA20) += salsa20_generic.o
|
||
|
|
obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
|
||
|
|
obj-$(CONFIG_CRYPTO_ZLIB) += zlib.o
|
||
|
|
+obj-$(CONFIG_CRYPTO_UNLZMA) += unlzma.o
|
||
|
|
obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
|
||
|
|
obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
|
||
|
|
obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.o
|
||
|
|
--- /dev/null
|
||
|
|
+++ b/crypto/unlzma.h
|
||
|
|
@@ -0,0 +1,80 @@
|
||
|
|
+/* LZMA uncompresion module for pcomp
|
||
|
|
+ * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
|
||
|
|
+ *
|
||
|
|
+ * Based on:
|
||
|
|
+ * Initial Linux kernel adaptation
|
||
|
|
+ * Copyright (C) 2006 Alain < alain@knaff.lu >
|
||
|
|
+ *
|
||
|
|
+ * Based on small lzma deflate implementation/Small range coder
|
||
|
|
+ * implementation for lzma.
|
||
|
|
+ * Copyright (C) 2006 Aurelien Jacobs < aurel@gnuage.org >
|
||
|
|
+ *
|
||
|
|
+ * Based on LzmaDecode.c from the LZMA SDK 4.22 (http://www.7-zip.org/)
|
||
|
|
+ * Copyright (C) 1999-2005 Igor Pavlov
|
||
|
|
+ *
|
||
|
|
+ * This program is free software; you can redistribute it and/or modify it
|
||
|
|
+ * under the terms of the GNU General Public License version 2 as published
|
||
|
|
+ * by the Free Software Foundation.
|
||
|
|
+ */
|
||
|
|
+#ifndef __UNLZMA_H
|
||
|
|
+#define __UNLZMA_H
|
||
|
|
+
|
||
|
|
+struct lzma_header {
|
||
|
|
+ __u8 pos;
|
||
|
|
+ __le32 dict_size;
|
||
|
|
+} __attribute__ ((packed)) ;
|
||
|
|
+
|
||
|
|
+
|
||
|
|
+#define RC_TOP_BITS 24
|
||
|
|
+#define RC_MOVE_BITS 5
|
||
|
|
+#define RC_MODEL_TOTAL_BITS 11
|
||
|
|
+
|
||
|
|
+#define LZMA_BASE_SIZE 1846
|
||
|
|
+#define LZMA_LIT_SIZE 768
|
||
|
|
+
|
||
|
|
+#define LZMA_NUM_POS_BITS_MAX 4
|
||
|
|
+
|
||
|
|
+#define LZMA_LEN_NUM_LOW_BITS 3
|
||
|
|
+#define LZMA_LEN_NUM_MID_BITS 3
|
||
|
|
+#define LZMA_LEN_NUM_HIGH_BITS 8
|
||
|
|
+
|
||
|
|
+#define LZMA_LEN_CHOICE 0
|
||
|
|
+#define LZMA_LEN_CHOICE_2 (LZMA_LEN_CHOICE + 1)
|
||
|
|
+#define LZMA_LEN_LOW (LZMA_LEN_CHOICE_2 + 1)
|
||
|
|
+#define LZMA_LEN_MID (LZMA_LEN_LOW \
|
||
|
|
+ + (1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_LOW_BITS)))
|
||
|
|
+#define LZMA_LEN_HIGH (LZMA_LEN_MID \
|
||
|
|
+ +(1 << (LZMA_NUM_POS_BITS_MAX + LZMA_LEN_NUM_MID_BITS)))
|
||
|
|
+#define LZMA_NUM_LEN_PROBS (LZMA_LEN_HIGH + (1 << LZMA_LEN_NUM_HIGH_BITS))
|
||
|
|
+
|
||
|
|
+#define LZMA_NUM_STATES 12
|
||
|
|
+#define LZMA_NUM_LIT_STATES 7
|
||
|
|
+
|
||
|
|
+#define LZMA_START_POS_MODEL_INDEX 4
|
||
|
|
+#define LZMA_END_POS_MODEL_INDEX 14
|
||
|
|
+#define LZMA_NUM_FULL_DISTANCES (1 << (LZMA_END_POS_MODEL_INDEX >> 1))
|
||
|
|
+
|
||
|
|
+#define LZMA_NUM_POS_SLOT_BITS 6
|
||
|
|
+#define LZMA_NUM_LEN_TO_POS_STATES 4
|
||
|
|
+
|
||
|
|
+#define LZMA_NUM_ALIGN_BITS 4
|
||
|
|
+
|
||
|
|
+#define LZMA_MATCH_MIN_LEN 2
|
||
|
|
+
|
||
|
|
+#define LZMA_IS_MATCH 0
|
||
|
|
+#define LZMA_IS_REP (LZMA_IS_MATCH + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX))
|
||
|
|
+#define LZMA_IS_REP_G0 (LZMA_IS_REP + LZMA_NUM_STATES)
|
||
|
|
+#define LZMA_IS_REP_G1 (LZMA_IS_REP_G0 + LZMA_NUM_STATES)
|
||
|
|
+#define LZMA_IS_REP_G2 (LZMA_IS_REP_G1 + LZMA_NUM_STATES)
|
||
|
|
+#define LZMA_IS_REP_0_LONG (LZMA_IS_REP_G2 + LZMA_NUM_STATES)
|
||
|
|
+#define LZMA_POS_SLOT (LZMA_IS_REP_0_LONG \
|
||
|
|
+ + (LZMA_NUM_STATES << LZMA_NUM_POS_BITS_MAX))
|
||
|
|
+#define LZMA_SPEC_POS (LZMA_POS_SLOT \
|
||
|
|
+ +(LZMA_NUM_LEN_TO_POS_STATES << LZMA_NUM_POS_SLOT_BITS))
|
||
|
|
+#define LZMA_ALIGN (LZMA_SPEC_POS \
|
||
|
|
+ + LZMA_NUM_FULL_DISTANCES - LZMA_END_POS_MODEL_INDEX)
|
||
|
|
+#define LZMA_LEN_CODER (LZMA_ALIGN + (1 << LZMA_NUM_ALIGN_BITS))
|
||
|
|
+#define LZMA_REP_LEN_CODER (LZMA_LEN_CODER + LZMA_NUM_LEN_PROBS)
|
||
|
|
+#define LZMA_LITERAL (LZMA_REP_LEN_CODER + LZMA_NUM_LEN_PROBS)
|
||
|
|
+
|
||
|
|
+#endif
|