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1034: NEWS, comments, and tests

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Kalle Olavi Niemitalo 2008-07-20 14:30:18 +03:00 committed by Kalle Olavi Niemitalo
parent b9d48ad7e8
commit 327fc1e46e
4 changed files with 47 additions and 5 deletions
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2
NEWS
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@ -38,6 +38,8 @@ Bugs that should be removed from NEWS before the 0.12.0 release:
was the first release that had these bugs.
* bug 1033: Fix memory leak in ECMAScript window.open. ELinks 0.12pre1
was the first release that had this bug.
* bug 1034: ``Content-Encoding: deflate'' allows a zlib header as
specified in RFC 2616.
* Global ECMAScript functions alert, open, and setTimeout again work
with SEE. ELinks 0.12pre1 was the first release that supported SEE
at all.

20
src/encoding/deflate.c
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@ -125,6 +125,26 @@ deflate_read(struct stream_encoded *stream, unsigned char *buf, int len)
restart:
err = inflate(&data->deflate_stream, Z_SYNC_FLUSH);
if (err == Z_DATA_ERROR && !data->after_first_read) {
/* RFC 2616 requires a zlib header for
* "Content-Encoding: deflate", but some HTTP
* servers (Microsoft-IIS/6.0 at blogs.msdn.com,
* and reportedly Apache with mod_deflate) omit
* that, causing Z_DATA_ERROR. Clarification of
* the term "deflate" has been requested for the
* next version of HTTP:
* http://www3.tools.ietf.org/wg/httpbis/trac/ticket/73
*
* Try to recover by telling zlib not to expect
* the header. If the error does not happen on
* the first inflate() call, then it is too late
* to recover because ELinks may already have
* discarded part of the input data.
*
* TODO: This fallback to raw DEFLATE is currently
* enabled for "Content-Encoding: gzip" too. It
* might be better to fall back to no compression
* at all, because Apache can send that header for
* uncompressed *.gz.md5 files. */
data->after_first_read = 1;
inflateEnd(&data->deflate_stream);
data->deflate_stream.avail_out = len;

8
test/cgi/chunked_deflate.py
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@ -1,11 +1,9 @@
#!/usr/bin/env python
import os, time
from zlib import *
import os, time, zlib
data1 = '<html><body>Two lines should be visible.<br/>The second line.</body></html>'
ob = compressobj(Z_DEFAULT_COMPRESSION, DEFLATED, -MAX_WBITS)
cd1 = ob.compress(data1)
cd1 += ob.flush()
cd1 = zlib.compress(data1)
length = len(cd1)
next_chunk = hex(length - 10)[2:]

22
test/cgi/chunked_raw_deflate.py Executable file
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@ -0,0 +1,22 @@
#!/usr/bin/env python
import os, time
from zlib import *
# According to section 3.5 of RFC 2616, "Content-Encoding: deflate"
# requires a ZLIB header. However, Microsoft-IIS/6.0 sends a raw
# DEFLATE stream instead. This CGI tests how ELinks handles that.
data1 = '<html><body>Two lines should be visible.<br/>The second line.</body></html>'
ob = compressobj(Z_DEFAULT_COMPRESSION, DEFLATED, -MAX_WBITS)
cd1 = ob.compress(data1)
cd1 += ob.flush()
length = len(cd1)
next_chunk = hex(length - 10)[2:]
os.write(1, "Date: Sun, 20 Jan 2008 15:24:00 GMT\r\nServer: ddd\r\nTransfer-Encoding: chunked\r\nContent-Encoding: deflate\r\nConnection: close\r\nContent-Type: text/html; charset=ISO-8859-1\r\n")
os.write(1, "\r\na\r\n")
os.write(1, cd1[:10])
time.sleep(2)
os.write(1, "\r\n%s\r\n" % next_chunk)
os.write(1, cd1[10:])
os.write(1, "\r\n0\r\n")