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avoid having to include zlib.h in Pl_Flate.hh

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git-svn-id: svn+q:///qpdf/trunk@882 71b93d88-0707-0410-a8cf-f5a4172ac649
This commit is contained in:
Jay Berkenbilt 2009-10-23 14:58:09 +00:00
parent b84b698a17
commit 3c84d496f0
2 changed files with 29 additions and 18 deletions
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4
include/qpdf/Pl_Flate.hh
View File

@ -10,8 +10,6 @@
#include <qpdf/Pipeline.hh>
#include <zlib.h>
class Pl_Flate: public Pipeline
{
public:
@ -38,7 +36,7 @@ class Pl_Flate: public Pipeline
int out_bufsize;
action_e action;
bool initialized;
z_stream zstream;
void* zdata;
};
#endif // __PL_FLATE_HH__

43
libqpdf/Pl_Flate.cc
View File

@ -1,4 +1,5 @@
#include <qpdf/Pl_Flate.hh>
#include <zlib.h>
#include <qpdf/QUtil.hh>
@ -10,7 +11,14 @@ Pl_Flate::Pl_Flate(char const* identifier, Pipeline* next,
initialized(false)
{
this->outbuf = new unsigned char[out_bufsize];
// Indirect through zdata to reach the z_stream so we don't have
// to include zlib.h in Pl_Flate.hh. This means people using
// shared library versions of qpdf don't have to have zlib
// development files available, which particularly helps in a
// Windows environment.
this->zdata = new z_stream;
z_stream& zstream = *((z_stream*) this->zdata);
zstream.zalloc = (alloc_func)0;
zstream.zfree = (free_func)0;
zstream.opaque = (voidpf)0;
@ -27,6 +35,8 @@ Pl_Flate::~Pl_Flate()
delete [] this->outbuf;
this->outbuf = 0;
}
delete (z_stream*)this->zdata;
this->zdata = 0;
}
void
@ -44,19 +54,20 @@ Pl_Flate::write(unsigned char* data, int len)
void
Pl_Flate::handleData(unsigned char* data, int len, int flush)
{
this->zstream.next_in = data;
this->zstream.avail_in = len;
z_stream& zstream = *((z_stream*) this->zdata);
zstream.next_in = data;
zstream.avail_in = len;
if (! this->initialized)
{
int err = Z_OK;
if (this->action == a_deflate)
{
err = deflateInit(&this->zstream, Z_DEFAULT_COMPRESSION);
err = deflateInit(&zstream, Z_DEFAULT_COMPRESSION);
}
else
{
err = inflateInit(&this->zstream);
err = inflateInit(&zstream);
}
checkError("Init", err);
this->initialized = true;
@ -69,11 +80,11 @@ Pl_Flate::handleData(unsigned char* data, int len, int flush)
{
if (action == a_deflate)
{
err = deflate(&this->zstream, flush);
err = deflate(&zstream, flush);
}
else
{
err = inflate(&this->zstream, flush);
err = inflate(&zstream, flush);
}
switch (err)
{
@ -91,20 +102,20 @@ Pl_Flate::handleData(unsigned char* data, int len, int flush)
case Z_OK:
{
if ((this->zstream.avail_in == 0) &&
(this->zstream.avail_out > 0))
if ((zstream.avail_in == 0) &&
(zstream.avail_out > 0))
{
// There is nothing left to read, and there was
// sufficient buffer space to write everything we
// needed, so we're done for now.
done = true;
}
uLong ready = (this->out_bufsize - this->zstream.avail_out);
uLong ready = (this->out_bufsize - zstream.avail_out);
if (ready > 0)
{
this->getNext()->write(this->outbuf, ready);
this->zstream.next_out = this->outbuf;
this->zstream.avail_out = this->out_bufsize;
zstream.next_out = this->outbuf;
zstream.avail_out = this->out_bufsize;
}
}
break;
@ -123,17 +134,18 @@ Pl_Flate::finish()
{
if (this->initialized)
{
z_stream& zstream = *((z_stream*) this->zdata);
unsigned char buf[1];
buf[0] = '\0';
handleData(buf, 0, Z_FINISH);
int err = Z_OK;
if (action == a_deflate)
{
err = deflateEnd(&this->zstream);
err = deflateEnd(&zstream);
}
else
{
err = inflateEnd(&this->zstream);
err = inflateEnd(&zstream);
}
checkError("End", err);
}
@ -147,15 +159,16 @@ Pl_Flate::finish()
void
Pl_Flate::checkError(char const* prefix, int error_code)
{
z_stream& zstream = *((z_stream*) this->zdata);
if (error_code != Z_OK)
{
char const* action_str = (action == a_deflate ? "deflate" : "inflate");
std::string msg =
this->identifier + ": " + action_str + ": " + prefix + ": ";
if (this->zstream.msg)
if (zstream.msg)
{
msg += this->zstream.msg;
msg += zstream.msg;
}
else
{