diff options
Diffstat (limited to 'grub-core/lib/xzembed/xz_private.h')
| -rw-r--r-- | grub-core/lib/xzembed/xz_private.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/grub-core/lib/xzembed/xz_private.h b/grub-core/lib/xzembed/xz_private.h new file mode 100644 index 0000000..fc845c9 --- /dev/null +++ b/grub-core/lib/xzembed/xz_private.h @@ -0,0 +1,96 @@ +/* xz_private.h - Private includes and definitions */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2010 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ +/* + * This file is based on code from XZ embedded project + * http://tukaani.org/xz/embedded.html + */ + +#ifndef XZ_PRIVATE_H +#define XZ_PRIVATE_H + +/* + * For userspace builds, use a separate header to define the required + * macros and functions. This makes it easier to adapt the code into + * different environments and avoids clutter in the Linux kernel tree. + */ +#include "xz_config.h" + +/* + * If any of the BCJ filter decoders are wanted, define XZ_DEC_BCJ. + * XZ_DEC_BCJ is used to enable generic support for BCJ decoders. + */ +#ifndef XZ_DEC_BCJ +# if defined(XZ_DEC_X86) || defined(XZ_DEC_POWERPC) \ + || defined(XZ_DEC_IA64) || defined(XZ_DEC_ARM) \ + || defined(XZ_DEC_ARM) || defined(XZ_DEC_ARMTHUMB) \ + || defined(XZ_DEC_SPARC) +# define XZ_DEC_BCJ +# endif +#endif + +/* + * Allocate memory for LZMA2 decoder. xz_dec_lzma2_reset() must be used + * before calling xz_dec_lzma2_run(). + */ +struct xz_dec_lzma2 * xz_dec_lzma2_create( + uint32_t dict_max); + +/* + * Decode the LZMA2 properties (one byte) and reset the decoder. Return + * XZ_OK on success, XZ_MEMLIMIT_ERROR if the preallocated dictionary is not + * big enough, and XZ_OPTIONS_ERROR if props indicates something that this + * decoder doesn't support. + */ +enum xz_ret xz_dec_lzma2_reset( + struct xz_dec_lzma2 *s, uint8_t props); + +/* Decode raw LZMA2 stream from b->in to b->out. */ +enum xz_ret xz_dec_lzma2_run( + struct xz_dec_lzma2 *s, struct xz_buf *b); + +/* Free the memory allocated for the LZMA2 decoder. */ +void xz_dec_lzma2_end(struct xz_dec_lzma2 *s); + +/* + * Allocate memory for BCJ decoders. xz_dec_bcj_reset() must be used before + * calling xz_dec_bcj_run(). + */ +struct xz_dec_bcj * xz_dec_bcj_create(bool single_call); + +/* + * Decode the Filter ID of a BCJ filter. This implementation doesn't + * support custom start offsets, so no decoding of Filter Properties + * is needed. Returns XZ_OK if the given Filter ID is supported. + * Otherwise XZ_OPTIONS_ERROR is returned. + */ +enum xz_ret xz_dec_bcj_reset( + struct xz_dec_bcj *s, uint8_t id); + +/* + * Decode raw BCJ + LZMA2 stream. This must be used only if there actually is + * a BCJ filter in the chain. If the chain has only LZMA2, xz_dec_lzma2_run() + * must be called directly. + */ +enum xz_ret xz_dec_bcj_run(struct xz_dec_bcj *s, + struct xz_dec_lzma2 *lzma2, struct xz_buf *b); + +/* Free the memory allocated for the BCJ filters. */ +#define xz_dec_bcj_end(s) kfree(s) + +#endif |