mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-27 16:58:09 +01:00
441 lines
10 KiB
C
441 lines
10 KiB
C
/* ntfscomp.c - compression support for the NTFS filesystem */
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/*
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* Copyright (C) 2007 Free Software Foundation, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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#include <grub/ntfs.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static grub_err_t
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decomp_nextvcn (struct grub_ntfs_comp *cc)
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{
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if (cc->comp_head >= cc->comp_tail)
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return grub_error (GRUB_ERR_BAD_FS, "compression block overflown");
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if (grub_disk_read
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(cc->disk,
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(cc->comp_table[cc->comp_head].next_lcn -
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(cc->comp_table[cc->comp_head].next_vcn - cc->cbuf_vcn)) << cc->log_spc,
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0,
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1 << (cc->log_spc + GRUB_NTFS_BLK_SHR), cc->cbuf))
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return grub_errno;
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cc->cbuf_vcn++;
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if ((cc->cbuf_vcn >= cc->comp_table[cc->comp_head].next_vcn))
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cc->comp_head++;
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cc->cbuf_ofs = 0;
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return 0;
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}
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static grub_err_t
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decomp_getch (struct grub_ntfs_comp *cc, grub_uint8_t *res)
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{
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if (cc->cbuf_ofs >= (1U << (cc->log_spc + GRUB_NTFS_BLK_SHR)))
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{
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if (decomp_nextvcn (cc))
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return grub_errno;
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}
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*res = cc->cbuf[cc->cbuf_ofs++];
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return 0;
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}
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static grub_err_t
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decomp_get16 (struct grub_ntfs_comp *cc, grub_uint16_t * res)
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{
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grub_uint8_t c1 = 0, c2 = 0;
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if ((decomp_getch (cc, &c1)) || (decomp_getch (cc, &c2)))
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return grub_errno;
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*res = ((grub_uint16_t) c2) * 256 + ((grub_uint16_t) c1);
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return 0;
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}
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/* Decompress a block (4096 bytes) */
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static grub_err_t
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decomp_block (struct grub_ntfs_comp *cc, grub_uint8_t *dest)
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{
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grub_uint16_t flg, cnt;
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if (decomp_get16 (cc, &flg))
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return grub_errno;
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cnt = (flg & 0xFFF) + 1;
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if (dest)
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{
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if (flg & 0x8000)
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{
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grub_uint8_t tag;
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grub_uint32_t bits, copied;
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bits = copied = tag = 0;
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while (cnt > 0)
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{
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if (copied > GRUB_NTFS_COM_LEN)
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return grub_error (GRUB_ERR_BAD_FS,
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"compression block too large");
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if (!bits)
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{
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if (decomp_getch (cc, &tag))
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return grub_errno;
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bits = 8;
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cnt--;
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if (cnt <= 0)
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break;
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}
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if (tag & 1)
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{
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grub_uint32_t i, len, delta, code, lmask, dshift;
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grub_uint16_t word;
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if (decomp_get16 (cc, &word))
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return grub_errno;
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code = word;
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cnt -= 2;
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if (!copied)
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{
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grub_error (GRUB_ERR_BAD_FS, "nontext window empty");
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return 0;
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}
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for (i = copied - 1, lmask = 0xFFF, dshift = 12; i >= 0x10;
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i >>= 1)
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{
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lmask >>= 1;
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dshift--;
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}
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delta = code >> dshift;
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len = (code & lmask) + 3;
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for (i = 0; i < len; i++)
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{
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dest[copied] = dest[copied - delta - 1];
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copied++;
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}
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}
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else
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{
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grub_uint8_t ch = 0;
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if (decomp_getch (cc, &ch))
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return grub_errno;
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dest[copied++] = ch;
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cnt--;
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}
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tag >>= 1;
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bits--;
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}
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return 0;
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}
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else
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{
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if (cnt != GRUB_NTFS_COM_LEN)
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return grub_error (GRUB_ERR_BAD_FS,
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"invalid compression block size");
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}
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}
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while (cnt > 0)
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{
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int n;
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n = (1 << (cc->log_spc + GRUB_NTFS_BLK_SHR)) - cc->cbuf_ofs;
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if (n > cnt)
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n = cnt;
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if ((dest) && (n))
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{
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grub_memcpy (dest, &cc->cbuf[cc->cbuf_ofs], n);
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dest += n;
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}
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cnt -= n;
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cc->cbuf_ofs += n;
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if ((cnt) && (decomp_nextvcn (cc)))
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return grub_errno;
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}
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return 0;
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}
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static grub_err_t
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read_block (struct grub_ntfs_rlst *ctx, grub_uint8_t *buf, grub_size_t num)
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{
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int log_cpb = GRUB_NTFS_LOG_COM_SEC - ctx->comp.log_spc;
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while (num)
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{
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grub_size_t nn;
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if ((ctx->target_vcn & 0xF) == 0)
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{
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if (ctx->comp.comp_head != ctx->comp.comp_tail
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&& !(ctx->flags & GRUB_NTFS_RF_BLNK))
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return grub_error (GRUB_ERR_BAD_FS, "invalid compression block");
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ctx->comp.comp_head = ctx->comp.comp_tail = 0;
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ctx->comp.cbuf_vcn = ctx->target_vcn;
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ctx->comp.cbuf_ofs = (1 << (ctx->comp.log_spc + GRUB_NTFS_BLK_SHR));
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if (ctx->target_vcn >= ctx->next_vcn)
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{
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if (grub_ntfs_read_run_list (ctx))
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return grub_errno;
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}
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while (ctx->target_vcn + 16 > ctx->next_vcn)
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{
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if (ctx->flags & GRUB_NTFS_RF_BLNK)
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break;
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ctx->comp.comp_table[ctx->comp.comp_tail].next_vcn = ctx->next_vcn;
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ctx->comp.comp_table[ctx->comp.comp_tail].next_lcn =
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ctx->curr_lcn + ctx->next_vcn - ctx->curr_vcn;
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ctx->comp.comp_tail++;
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if (grub_ntfs_read_run_list (ctx))
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return grub_errno;
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}
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}
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nn = (16 - (unsigned) (ctx->target_vcn & 0xF)) >> log_cpb;
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if (nn > num)
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nn = num;
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num -= nn;
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if (ctx->flags & GRUB_NTFS_RF_BLNK)
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{
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ctx->target_vcn += nn << log_cpb;
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if (ctx->comp.comp_tail == 0)
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{
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if (buf)
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{
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grub_memset (buf, 0, nn * GRUB_NTFS_COM_LEN);
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buf += nn * GRUB_NTFS_COM_LEN;
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if (grub_file_progress_hook && ctx->file)
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grub_file_progress_hook (0, 0, nn * GRUB_NTFS_COM_LEN,
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ctx->file);
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}
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}
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else
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{
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while (nn)
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{
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if (decomp_block (&ctx->comp, buf))
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return grub_errno;
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if (buf)
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buf += GRUB_NTFS_COM_LEN;
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if (grub_file_progress_hook && ctx->file)
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grub_file_progress_hook (0, 0, GRUB_NTFS_COM_LEN,
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ctx->file);
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nn--;
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}
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}
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}
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else
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{
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nn <<= log_cpb;
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while ((ctx->comp.comp_head < ctx->comp.comp_tail) && (nn))
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{
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grub_disk_addr_t tt;
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tt =
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ctx->comp.comp_table[ctx->comp.comp_head].next_vcn -
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ctx->target_vcn;
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if (tt > nn)
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tt = nn;
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ctx->target_vcn += tt;
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if (buf)
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{
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if (grub_disk_read
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(ctx->comp.disk,
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(ctx->comp.comp_table[ctx->comp.comp_head].next_lcn -
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(ctx->comp.comp_table[ctx->comp.comp_head].next_vcn -
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ctx->target_vcn)) << ctx->comp.log_spc, 0,
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tt << (ctx->comp.log_spc + GRUB_NTFS_BLK_SHR), buf))
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return grub_errno;
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if (grub_file_progress_hook && ctx->file)
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grub_file_progress_hook (0, 0,
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tt << (ctx->comp.log_spc
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+ GRUB_NTFS_BLK_SHR),
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ctx->file);
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buf += tt << (ctx->comp.log_spc + GRUB_NTFS_BLK_SHR);
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}
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nn -= tt;
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if (ctx->target_vcn >=
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ctx->comp.comp_table[ctx->comp.comp_head].next_vcn)
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ctx->comp.comp_head++;
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}
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if (nn)
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{
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if (buf)
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{
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if (grub_disk_read
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(ctx->comp.disk,
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(ctx->target_vcn - ctx->curr_vcn +
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ctx->curr_lcn) << ctx->comp.log_spc, 0,
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nn << (ctx->comp.log_spc + GRUB_NTFS_BLK_SHR), buf))
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return grub_errno;
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buf += nn << (ctx->comp.log_spc + GRUB_NTFS_BLK_SHR);
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if (grub_file_progress_hook && ctx->file)
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grub_file_progress_hook (0, 0,
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nn << (ctx->comp.log_spc
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+ GRUB_NTFS_BLK_SHR),
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ctx->file);
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}
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ctx->target_vcn += nn;
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}
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}
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}
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return 0;
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}
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static grub_err_t
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ntfscomp (grub_uint8_t *dest, grub_disk_addr_t ofs,
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grub_size_t len, struct grub_ntfs_rlst *ctx)
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{
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grub_err_t ret;
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grub_disk_addr_t vcn;
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if (ctx->attr->sbuf)
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{
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if ((ofs & (~(GRUB_NTFS_COM_LEN - 1))) == ctx->attr->save_pos)
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{
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grub_disk_addr_t n;
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n = GRUB_NTFS_COM_LEN - (ofs - ctx->attr->save_pos);
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if (n > len)
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n = len;
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grub_memcpy (dest, ctx->attr->sbuf + ofs - ctx->attr->save_pos, n);
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if (grub_file_progress_hook && ctx->file)
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grub_file_progress_hook (0, 0, n, ctx->file);
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if (n == len)
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return 0;
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dest += n;
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len -= n;
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ofs += n;
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}
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}
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else
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{
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ctx->attr->sbuf = grub_malloc (GRUB_NTFS_COM_LEN);
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if (ctx->attr->sbuf == NULL)
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return grub_errno;
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ctx->attr->save_pos = 1;
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}
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vcn = ctx->target_vcn = (ofs >> GRUB_NTFS_COM_LOG_LEN) * (GRUB_NTFS_COM_SEC >> ctx->comp.log_spc);
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ctx->target_vcn &= ~0xFULL;
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while (ctx->next_vcn <= ctx->target_vcn)
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{
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if (grub_ntfs_read_run_list (ctx))
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return grub_errno;
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}
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ctx->comp.comp_head = ctx->comp.comp_tail = 0;
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ctx->comp.cbuf = grub_malloc (1 << (ctx->comp.log_spc + GRUB_NTFS_BLK_SHR));
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if (!ctx->comp.cbuf)
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return 0;
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ret = 0;
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//ctx->comp.disk->read_hook = read_hook;
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//ctx->comp.disk->read_hook_data = read_hook_data;
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if ((vcn > ctx->target_vcn) &&
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(read_block
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(ctx, NULL, (vcn - ctx->target_vcn) >> (GRUB_NTFS_LOG_COM_SEC - ctx->comp.log_spc))))
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{
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ret = grub_errno;
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goto quit;
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}
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if (ofs % GRUB_NTFS_COM_LEN)
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{
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grub_uint32_t t, n, o;
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void *file = ctx->file;
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ctx->file = 0;
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t = ctx->target_vcn << (ctx->comp.log_spc + GRUB_NTFS_BLK_SHR);
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if (read_block (ctx, ctx->attr->sbuf, 1))
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{
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ret = grub_errno;
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goto quit;
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}
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ctx->file = file;
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ctx->attr->save_pos = t;
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o = ofs % GRUB_NTFS_COM_LEN;
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n = GRUB_NTFS_COM_LEN - o;
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if (n > len)
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n = len;
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grub_memcpy (dest, &ctx->attr->sbuf[o], n);
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if (grub_file_progress_hook && ctx->file)
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grub_file_progress_hook (0, 0, n, ctx->file);
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if (n == len)
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goto quit;
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dest += n;
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len -= n;
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}
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if (read_block (ctx, dest, len / GRUB_NTFS_COM_LEN))
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{
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ret = grub_errno;
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goto quit;
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}
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dest += (len / GRUB_NTFS_COM_LEN) * GRUB_NTFS_COM_LEN;
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len = len % GRUB_NTFS_COM_LEN;
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if (len)
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{
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grub_uint32_t t;
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void *file = ctx->file;
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ctx->file = 0;
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t = ctx->target_vcn << (ctx->comp.log_spc + GRUB_NTFS_BLK_SHR);
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if (read_block (ctx, ctx->attr->sbuf, 1))
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{
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ret = grub_errno;
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goto quit;
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}
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ctx->attr->save_pos = t;
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grub_memcpy (dest, ctx->attr->sbuf, len);
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if (grub_file_progress_hook && file)
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grub_file_progress_hook (0, 0, len, file);
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}
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quit:
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//ctx->comp.disk->read_hook = 0;
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if (ctx->comp.cbuf)
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grub_free (ctx->comp.cbuf);
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return ret;
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}
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grub_err_t
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grub_ntfscomp_func (grub_uint8_t *dest, grub_disk_addr_t ofs,
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grub_size_t len, struct grub_ntfs_rlst *ctx)
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{
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return ntfscomp(dest, ofs, len, ctx);
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}
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