compression

问题 Here is the situation: I get gzipped xml documents from Amazon S3 import boto from boto.s3.connection import S3Connection from boto.s3.key import Key conn = S3Connection('access Id', 'secret access key') b = conn.get_bucket('mydev.myorg') k = Key(b) k.key('documents/document.xml.gz') I read them in file as import gzip f = open('/tmp/p', 'w') k.get_file(f) f.close() r = gzip.open('/tmp/p', 'rb') file_content = r.read() r.close() Question How can I unzip the streams directly and read the

问题 Here is the situation: I get gzipped xml documents from Amazon S3 import boto from boto.s3.connection import S3Connection from boto.s3.key import Key conn = S3Connection('access Id', 'secret access key') b = conn.get_bucket('mydev.myorg') k = Key(b) k.key('documents/document.xml.gz') I read them in file as import gzip f = open('/tmp/p', 'w') k.get_file(f) f.close() r = gzip.open('/tmp/p', 'rb') file_content = r.read() r.close() Question How can I unzip the streams directly and read the

问题 Alternative Titles (to aid searches) Compressing PNGs Reduce the size of an iPhone Archive (.ipa) Adding a build rule to compress images in Xcode iOS Apps can only be downloaded via 3G if they are less than 100MB. What are the best strategies for reducing the size of an App? Areas I'd like to focus on are: Images Databases Code Static Libraries NB: The original question can be viewed in the revisions of this question 回答1: PNG is really the best option for lossless image compression. You can

问题 I have installed Static and dynamic compression for IIS7, as well as setting the two web.config values at my application Virtual Folder level. As I understand it, I don't need to enable compression at the server, or site level anymore, and I can manage it on a per folder basis using my web.config file. I have two settings in my .config file that I have set to customize gzip for my app: <httpCompression dynamicCompressionDisableCpuUsage="90" dynamicCompressionEnableCpuUsage="0"> <scheme name=

问题 I'm trying to create a ZIP archive with a simple demo text file using a MemoryStream as follows: using (var memoryStream = new MemoryStream()) using (var archive = new ZipArchive(memoryStream , ZipArchiveMode.Create)) { var demoFile = archive.CreateEntry("foo.txt"); using (var entryStream = demoFile.Open()) using (var streamWriter = new StreamWriter(entryStream)) { streamWriter.Write("Bar!"); } using (var fileStream = new FileStream(@"C:\Temp\test.zip", FileMode.Create)) { stream.CopyTo

问题 What advantages do either method offer for html, css and javascript files served by a LAMP server. Are there better alternatives? The server provides information to a map application using Json, so a high volume of small files. See also Is there any performance hit involved in choosing gzip over deflate for http compression? 回答1: Why use deflate instead of gzip for text files served by Apache? The simple answer is don't . RFC 2616 defines deflate as: deflate The "zlib" format defined in RFC

问题 I am using GZIP compression technique to compress various files in my application. All the files were getting Gzipped and compressed when I was using them on my local server (jBoss EAP 6.1--Standalone-Full profile) but when I tried to implement that on my server (Linux System) the same is not happening . I added this in my standalone -- > for windows system . <system-properties> <property name="org.apache.coyote.http11.Http11Protocol.COMPRESSION" value="on"/> <property name="org.apache.coyote

问题 I want to compress XML in Flex, send it to Java, decompress it in Java and recompress it in Java, resend it to Flex, decompress it and use it. How to do please ? thnx 回答1: Just use an AMF Gateway which is a binary format and gives much smaller transfer sizes for your data. Look into BlazeDS and/or LiveCycle. I believe it is possible to send XML over an AMF Gateway, although most of hte time I take advantage of the built in "Backend Object to AS Object" translation, 回答2: Just turn on gzip in

问题 I am using MiniLZO on a project for some really simple compression tasks. I am compressing with one program, and decompressing with another. I'd like to know how much space to allocate for the decompression buffer. I am fine with over-allocating space, if it can save me the trouble of having to annotate my output file with an integer declaring how much space the decompressed data should take. How would I figure out how much space it could possibly take? After some consideration, I think this

问题 I have file that consists of a sequence of real time unix timestamps with microsecond accuracy, i.e. the timestamps can never decrease. All the timestamps that need to be coded/decoded are from the same day. A sample entry in the file might be something like 1364281200.078739 that corresponds to 1364281200078739 usecs since epoch. Data is unevenly spaced and bounded. I need to achieve a compression of around 10 bits/timestamp. Currently I am able to compress to average of 31 bits/timestamp by