0 + l4( (  fB- _I|+? /* * XZ decompressor * * Authors: Lasse Collin * Igor Pavlov * * This file has been put into the public domain. * You can do whatever you want with this file. */ #ifndef XZ_H #define XZ_H #ifdef __KERNEL__ # include # include #else # include # include #endif /* In Linux, this is used to make extern functions static when needed. */ #ifndef XZ_EXTERN # define XZ_EXTERN extern #endif /** * enum xz_mode - Operation mode * * @XZ_SINGLE: Single-call mode. This uses less RAM than * multi-call modes, because the LZMA2 * dictionary doesn't need to be allocated as * part of the decoder state. All required data * structures are allocated at initialization, * so xz_dec_run() cannot return XZ_MEM_ERROR. * @XZ_PREALLOC: Multi-call mode with preallocated LZMA2 * dictionary buffer. All data structures are * allocated at initialization, so xz_dec_run() * cannot return XZ_MEM_ERROR. * @XZ_DYNALLOC: Multi-call mode. The LZMA2 dictionary is * allocated once the required size has been * parsed from the stream headers. If the * allocation fails, xz_dec_run() will return * XZ_MEM_ERROR. * * It is possible to enable support only for a subset of the above * modes at compile time by defining XZ_DEC_SINGLE, XZ_DEC_PREALLOC, * or XZ_DEC_DYNALLOC. The xz_dec kernel module is always compiled * with support for all operation modes, but the preboot code may * be built with fewer features to minimize code size. */ enum xz_mode { XZ_SINGLE, XZ_PREALLOC, XZ_DYNALLOC }; /** * enum xz_ret - Return codes * @XZ_OK: Everything is OK so far. More input or more * output space is required to continue. This * return code is possible only in multi-call mode * (XZ_PREALLOC or XZ_DYNALLOC). * @XZ_STREAM_END: Operation finished successfully. * @XZ_UNSUPPORTED_CHECK: Integrity check type is not supported. Decoding * is still possible in multi-call mode by simply * calling xz_dec_run() again. * Note that this return value is used only if * XZ_DEC_ANY_CHECK was defined at build time, * which is not used in the kernel. Unsupported * check types return XZ_OPTIONS_ERROR if * XZ_DEC_ANY_CHECK was not defined at build time. * @XZ_MEM_ERROR: Allocating memory failed. This return code is * possible only if the decoder was initialized * with XZ_DYNALLOC. The amount of memory that was * tried to be allocated was no more than the * dict_max argument given to xz_dec_init(). * @XZ_MEMLIMIT_ERROR: A bigger LZMA2 dictionary would be needed than * allowed by the dict_max argument given to * xz_dec_init(). This return value is possible * only in multi-call mode (XZ_PREALLOC or * XZ_DYNALLOC); the single-call mode (XZ_SINGLE) * ignores the dict_max argument. * @XZ_FORMAT_ERROR: File format was not recognized (wrong magic * bytes). * @XZ_OPTIONS_ERROR: This implementation doesn't support the requested * compression options. In the decoder this means * that the header CRC32 matches, but the header * i