5056b238a2
using xz embedded (public domain code).
in order to be enable to use ordinary xz files, support for crc64
was activated. (if using crc32 only, one would need to use a command
like
xz --check=crc32 --lzma2=preset=6e,dict=64KiB
to create the files.
with crc64, one can use files that have been compressed with settings
up to -9 (however, those need 64+1MB for decompression).
since gb/gbc files are small anyway, using compression level 6-8 might
be preferable to keep client memory consumption down.
every step in xz compression level downwards decreases decomp mem usage
by 50% (so level 8 would need 32+1 MB, etc).
133 lines
3 KiB
C
133 lines
3 KiB
C
/*
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* Private includes and definitions for userspace use of XZ Embedded
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*
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* Author: Lasse Collin <lasse.collin@tukaani.org>
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*/
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#ifndef XZ_CONFIG_H
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#define XZ_CONFIG_H
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/* Uncomment to enable CRC64 support. */
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#define XZ_USE_CRC64
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/* Uncomment as needed to enable BCJ filter decoders. */
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#if 0
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#define XZ_DEC_X86
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#define XZ_DEC_POWERPC
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#define XZ_DEC_IA64
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#define XZ_DEC_ARM
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#define XZ_DEC_ARMTHUMB
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#define XZ_DEC_SPARC
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#endif
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/*
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* MSVC doesn't support modern C but XZ Embedded is mostly C89
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* so these are enough.
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*/
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#ifdef _MSC_VER
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typedef unsigned char bool;
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# define true 1
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# define false 0
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# define inline __inline
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#else
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# if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L
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# if defined(__GNUC__)
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# define inline __inline
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# else
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# define inline
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# endif
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# endif
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# include <stdbool.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include "xz.h"
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#define kmalloc(size, flags) malloc(size)
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#define kfree(ptr) free(ptr)
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#define vmalloc(size) malloc(size)
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#define vfree(ptr) free(ptr)
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#define memeq(a, b, size) (memcmp(a, b, size) == 0)
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#define memzero(buf, size) memset(buf, 0, size)
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#ifndef min
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# define min(x, y) ((x) < (y) ? (x) : (y))
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#endif
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#define min_t(type, x, y) min(x, y)
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/*
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* Some functions have been marked with __always_inline to keep the
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* performance reasonable even when the compiler is optimizing for
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* small code size. You may be able to save a few bytes by #defining
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* __always_inline to plain inline, but don't complain if the code
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* becomes slow.
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*
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* NOTE: System headers on GNU/Linux may #define this macro already,
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* so if you want to change it, you need to #undef it first.
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*/
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#ifndef __always_inline
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# ifdef __GNUC__
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# define __always_inline \
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inline __attribute__((__always_inline__))
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# else
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# define __always_inline inline
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# endif
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#endif
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/* Inline functions to access unaligned unsigned 32-bit integers */
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#ifndef get_unaligned_le32
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static inline uint32_t get_unaligned_le32(const uint8_t *buf)
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{
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return (uint32_t)buf[0]
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| ((uint32_t)buf[1] << 8)
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| ((uint32_t)buf[2] << 16)
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| ((uint32_t)buf[3] << 24);
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}
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#endif
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#ifndef get_unaligned_be32
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static inline uint32_t get_unaligned_be32(const uint8_t *buf)
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{
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return (uint32_t)(buf[0] << 24)
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| ((uint32_t)buf[1] << 16)
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| ((uint32_t)buf[2] << 8)
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| (uint32_t)buf[3];
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}
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#endif
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#ifndef put_unaligned_le32
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static inline void put_unaligned_le32(uint32_t val, uint8_t *buf)
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{
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buf[0] = (uint8_t)val;
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buf[1] = (uint8_t)(val >> 8);
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buf[2] = (uint8_t)(val >> 16);
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buf[3] = (uint8_t)(val >> 24);
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}
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#endif
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#ifndef put_unaligned_be32
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static inline void put_unaligned_be32(uint32_t val, uint8_t *buf)
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{
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buf[0] = (uint8_t)(val >> 24);
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buf[1] = (uint8_t)(val >> 16);
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buf[2] = (uint8_t)(val >> 8);
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buf[3] = (uint8_t)val;
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}
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#endif
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/*
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* Use get_unaligned_le32() also for aligned access for simplicity. On
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* little endian systems, #define get_le32(ptr) (*(const uint32_t *)(ptr))
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* could save a few bytes in code size.
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*/
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#ifndef get_le32
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# define get_le32 get_unaligned_le32
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#endif
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#endif
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