LZMA压缩库使用记录工具使用

使用原因：
使用py2,.7版本，对应有pylzma支持库，但是发现支持库对于参数设置好像不是很全面，如字典大小支持范围较小，于是重新下载自己编译调用
7Z包含的算法有：
LZMA 改良与优化后的 LZ77 算法
LZMA2 改良的 LZMA 算法
PPMD 基于 Dmitry Shkarin 的 PPMdH 算法
BCJ 32 位 x86 可执行文件转换程序
BCJ2 32 位 x86 可执行文件转换程序
BZip2 标准 BWT 算法
Deflate 标准 LZ77-based 算法
LZMA算法介绍：
LZMA是7z格式默认的压缩算法，它的主要特征有：
● 高压缩比率；
● 可变的字典大小（高达4GB）；
● 压缩速度：在 2 GHz CPU上，大约 1 MB/s；
● 解压缩速度：在 2 GHz CPU上，大约10-20 MB/s ；
● 较小解压缩内存（依赖于所选的字典大小）；
● 较小的解压缩代码，大约5KB；
● 支持多线程；
下载链接：
http://www.7-zip.org/sdk.html
下载后编译为对应使用平台动态库，导出LzmaLib.h中的相关加解压函数接口
MY_STDAPI LzmaCompress(unsigned char *dest, size_t *destLen, const unsigned char *src, size_t srcLen,
unsigned char outProps, size_t *outPropsSize, / outPropsSize must be = 5 /
int level, /* 0 <= level <= 9, default = 5 */
unsigned dictSize, /* default = (1 << 24) */
int lc, /* 0 <= lc <= 8, default = 3 */
int lp, /* 0 <= lp <= 4, default = 0 */
int pb, /* 0 <= pb <= 4, default = 2 */
int fb, /* 5 <= fb <= 273, default = 32 */
int numThreads /* 1 or 2, default = 2 */
);
MY_STDAPI LzmaUncompress(unsigned char *dest, size_t *destLen, const unsigned char *src, SizeT *srcLen,
const unsigned char *props, size_t propsSize);
附上简单封装调用的python脚本：

# -*-coding:utf-8-*- from ctypes import *class lzmaLib1604: SZ_OK = 0 #- OK SZ_ERROR_DATA = https://www.it610.com/article/1 #- Data error SZ_ERROR_MEM = 2 #- Memory allocation error SZ_ERROR_UNSUPPORTED = 4#- Unsupported properties SZ_ERROR_PARAM = 5 #- Incorrect paramater SZ_ERROR_INPUT_EOF = 6 #- it needs more bytes in input buffer (src) SZ_ERROR_OUTPUT_EOF = 7 #- output buffer overflow SZ_ERROR_THREAD = 12 #- errors in multithreading functions(only for Mt version) LZMA_PROPS_SIZE = 5def __init__(self): self.Lzma1604LibPath ="Lzma1604" self.Objdll = CDLL(self.Lzma1604LibPath)# int LzmaCompress(unsigned char * dest, size_t * destLen, const unsigned char * src, size_t srcLen,unsigned char * outProps, size_t * outPropsSize, # int level, / *0 <= level <= 9, default = 5 * / # unsigneddictSize, / *use(1 << N) or (3 << N).4KB < dictSize <= 128MB * / # int lc, / *0 <= lc <= 8, default = 3 * / # int lp, / *0 <= lp <= 4, default = 0 * / # int pb, / *0 <= pb <= 4, default = 2 * / # int fb, / *5 <= fb <= 273, default = 32 * / # int numThreads / * 1 or 2, default = 2 * / def LzmaCompress(self,uncompressData,uncompressLen,compressLen): outPropsSize = c_uint(self.LZMA_PROPS_SIZE) outProps = create_string_buffer('/0' * self.LZMA_PROPS_SIZE) level = c_int(9) dictSize = c_uint(1 << 24) lc = c_int(3) lp = c_int(0) pb = c_int(2) fb = c_int(32) numThreads = c_int(1)srcBuf = c_char_p() srcBuf.value = https://www.it610.com/article/uncompressData srcBufLen = c_uint(uncompressLen)destBuf = create_string_buffer('/0' * compressLen) destLen = c_uint(compressLen)result = -1 try: result = self.Objdll.LzmaCompress(byref(destBuf),byref(destLen),srcBuf,srcBufLen,byref(outProps),byref(outPropsSize),level,dictSize,lc,lp,pb,fb,numThreads) except: print "lzmaLib1604_LzmaCompress : compress failed."if result == self.SZ_OK: return outProps[:outPropsSize.value] + destBuf[:destLen.value] elif result == self.SZ_ERROR_MEM: print "lzmaLib1604_LzmaCompress : memory malloc failed." elif result == self.SZ_ERROR_PARAM: print "lzmaLib1604_LzmaCompress : parameters wrong." elif result == self.SZ_ERROR_OUTPUT_EOF: print "lzmaLib1604_LzmaCompress : output memory too little." elif result == self.SZ_ERROR_THREAD: print "lzmaLib1604_LzmaCompress : thread error." else: print "lzmaLib1604_LzmaCompress : unknown error."return ""def LzmaUnCompress(self,compressData,compressLen,uncompressLen): outPropsSize = c_uint(self.LZMA_PROPS_SIZE) outProps = c_char_p() outProps.value = https://www.it610.com/article/compressData[:self.LZMA_PROPS_SIZE]srcBuf = c_char_p() srcBuf.value = compressData[self.LZMA_PROPS_SIZE:] srcBufLen = c_uint(compressLen - self.LZMA_PROPS_SIZE)destBuf = create_string_buffer('/0' * uncompressLen) destLen = c_uint(uncompressLen)result = -1 try: result = self.Objdll.LzmaUncompress(byref(destBuf),byref(destLen),srcBuf,byref(srcBufLen),outProps,outPropsSize) except: print "lzmaLib1604_LzmaUnCompress : uncompress failed."if result == self.SZ_OK: return destBuf.raw[:uncompressLen] elif result == self.SZ_ERROR_MEM: print "lzmaLib1604_LzmaUnCompress : memory malloc failed." elif result == self.SZ_ERROR_DATA: print "lzmaLib1604_LzmaUnCompress : Data error." elif result == self.SZ_ERROR_UNSUPPORTED: print "lzmaLib1604_LzmaUnCompress : Unsupported properties." elif result == self.SZ_ERROR_INPUT_EOF: print "lzmaLib1604_LzmaUnCompress : it needs more bytes in input buffer (src)." else: print "lzmaLib1604_LzmaUnCompress : unknown error."return ""

【LZMA压缩库使用记录】参考：
http://velep.com/archives/368.html