Class: Zlib::Inflate
Overview
Zlib:Inflate is the class for decompressing compressed data. Unlike Zlib::Deflate, an instance of this class is not able to duplicate (clone, dup) itself.
Class Method Summary collapse
-
.inflate ⇒ Object
call-seq: Zlib::Inflate.inflate(string).
Instance Method Summary collapse
-
#<<(string) ⇒ Object
Inputs
stringinto the inflate stream just like Zlib::Inflate#inflate, but returns the Zlib::Inflate object itself. -
#inflate ⇒ Object
call-seq: inflate(string).
-
#initialize ⇒ Object
constructor
call-seq: Zlib::Inflate.new(window_bits).
-
#set_dictionary ⇒ Object
Sets the preset dictionary and returns
string. -
#sync(string) ⇒ Object
Inputs
stringinto the end of input buffer and skips data until a full flush point can be found. -
#sync_point? ⇒ Boolean
Quoted verbatim from original documentation:.
Methods inherited from ZStream
#adler, #avail_in, #avail_out, #avail_out=, #close, #closed?, #data_type, #end, #ended?, #finish, #finished?, #flush_next_in, #flush_next_out, #reset, #stream_end?, #total_in, #total_out
Constructor Details
#initialize ⇒ Object
call-seq: Zlib::Inflate.new(window_bits)
Arguments
windowBits-
An Integer for the windowBits size. Should be in the range 8..15, larger values of this parameter result in better at the expense of memory usage.
Description
Creates a new inflate stream for decompression. See zlib.h for details of the argument. If window_bits is nil, the default value is used.
Example
cf = File.open("compressed.file")
ucf = File.open("uncompressed.file", "w+")
zi = Zlib::Inflate.new(Zlib::MAX_WBITS)
ucf << zi.inflate(cf.read)
ucf.close
zi.close
cf.close
or
File.open("compressed.file") {|cf|
zi = Zlib::Inflate.new
File.open("uncompressed.file", "w+") {|ucf|
ucf << zi.inflate(cf.read)
}
zi.close
}
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 |
# File 'zlib.c', line 1653
static VALUE
rb_inflate_initialize(int argc, VALUE *argv, VALUE obj)
{
struct zstream *z;
VALUE wbits;
int err;
rb_scan_args(argc, argv, "01", &wbits);
Data_Get_Struct(obj, struct zstream, z);
err = inflateInit2(&z->stream, ARG_WBITS(wbits));
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
ZSTREAM_READY(z);
return obj;
}
|
Class Method Details
.inflate ⇒ Object
call-seq: Zlib::Inflate.inflate(string)
Decompresses string. Raises a Zlib::NeedDict exception if a preset dictionary is needed for decompression.
This method is almost equivalent to the following code:
def inflate(string)
zstream = Zlib::Inflate.new
buf = zstream.inflate(string)
zstream.finish
zstream.close
buf
end
See also Zlib.deflate
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 |
# File 'zlib.c', line 1704
static VALUE
rb_inflate_s_inflate(VALUE obj, VALUE src)
{
struct zstream z;
VALUE dst, args[2];
int err;
StringValue(src);
zstream_init_inflate(&z);
err = inflateInit(&z.stream);
if (err != Z_OK) {
raise_zlib_error(err, z.stream.msg);
}
ZSTREAM_READY(&z);
args[0] = (VALUE)&z;
args[1] = src;
dst = rb_ensure(inflate_run, (VALUE)args, zstream_end, (VALUE)&z);
OBJ_INFECT(dst, src);
return dst;
}
|
Instance Method Details
#<<(string) ⇒ Object
Inputs string into the inflate stream just like Zlib::Inflate#inflate, but returns the Zlib::Inflate object itself. The output from the stream is preserved in output buffer.
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 |
# File 'zlib.c', line 1793
static VALUE
rb_inflate_addstr(VALUE obj, VALUE src)
{
struct zstream *z = get_zstream(obj);
OBJ_INFECT(obj, src);
if (ZSTREAM_IS_FINISHED(z)) {
if (!NIL_P(src)) {
StringValue(src);
zstream_append_buffer2(z, src);
}
}
else {
do_inflate(z, src);
if (ZSTREAM_IS_FINISHED(z)) {
zstream_passthrough_input(z);
}
}
return obj;
}
|
#inflate ⇒ Object
call-seq: inflate(string)
Inputs string into the inflate stream and returns the output from the stream. Calling this method, both the input and the output buffer of the stream are flushed. If string is nil, this method finishes the stream, just like Zlib::ZStream#finish.
Raises a Zlib::NeedDict exception if a preset dictionary is needed to decompress. Set the dictionary by Zlib::Inflate#set_dictionary and then call this method again with an empty string. (???)
See also Zlib::Inflate.new
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 |
# File 'zlib.c', line 1756
static VALUE
rb_inflate_inflate(VALUE obj, VALUE src)
{
struct zstream *z = get_zstream(obj);
VALUE dst;
OBJ_INFECT(obj, src);
if (ZSTREAM_IS_FINISHED(z)) {
if (NIL_P(src)) {
dst = zstream_detach_buffer(z);
}
else {
StringValue(src);
zstream_append_buffer2(z, src);
dst = rb_str_new(0, 0);
}
}
else {
do_inflate(z, src);
dst = zstream_detach_buffer(z);
if (ZSTREAM_IS_FINISHED(z)) {
zstream_passthrough_input(z);
}
}
OBJ_INFECT(dst, obj);
return dst;
}
|
#set_dictionary ⇒ Object
Sets the preset dictionary and returns string. This method is available just only after a Zlib::NeedDict exception was raised. See zlib.h for details.
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 |
# File 'zlib.c', line 1864
static VALUE
rb_inflate_set_dictionary(VALUE obj, VALUE dic)
{
struct zstream *z = get_zstream(obj);
VALUE src = dic;
int err;
OBJ_INFECT(obj, dic);
StringValue(src);
err = inflateSetDictionary(&z->stream,
(Bytef*)RSTRING_PTR(src), RSTRING_LENINT(src));
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
return dic;
}
|
#sync(string) ⇒ Object
Inputs string into the end of input buffer and skips data until a full flush point can be found. If the point is found in the buffer, this method flushes the buffer and returns false. Otherwise it returns true and the following data of full flush point is preserved in the buffer.
1824 1825 1826 1827 1828 1829 1830 1831 1832 |
# File 'zlib.c', line 1824
static VALUE
rb_inflate_sync(VALUE obj, VALUE src)
{
struct zstream *z = get_zstream(obj);
OBJ_INFECT(obj, src);
StringValue(src);
return zstream_sync(z, (Bytef*)RSTRING_PTR(src), RSTRING_LEN(src));
}
|
#sync_point? ⇒ Boolean
Quoted verbatim from original documentation:
What is this?
:)
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 |
# File 'zlib.c', line 1841
static VALUE
rb_inflate_sync_point_p(VALUE obj)
{
struct zstream *z = get_zstream(obj);
int err;
err = inflateSyncPoint(&z->stream);
if (err == 1) {
return Qtrue;
}
if (err != Z_OK) {
raise_zlib_error(err, z->stream.msg);
}
return Qfalse;
}
|