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encoder.cpp
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encoder.cpp
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/* encoder.cpp -- various PostScript and PDF encoding filter implementations
* by [email protected] at Sun Mar 3 14:16:00 CET 2002
* --- Mon Mar 4 00:00:20 CET 2002
*/
/* Imp: make built-in FlateEncode DYNALLOC */
/* Imp: add lzw_codec */
/* Imp: add gzip */
/* Imp: add zlib */
#ifdef __GNUC__
#ifndef __clang__
#pragma implementation
#endif
#endif
#include "encoder.hpp"
#include "error.hpp"
#include "gensio.hpp"
#include <stdlib.h> /* getenv() */
#include <string.h>
/* --- */
/** Does output EOD (end-of-data) marker `>' */
class ASCIIHexEncode: public PSEncoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
ASCIIHexEncode(GenBuffer::Writable &out_, unsigned maxcpl_);
virtual void vi_write(char const*buf, slen_t len);
protected:
unsigned maxcpl;
/** Number of hex digits already printed. */
unsigned curcpl;
GenBuffer::Writable &out;
};
/** Does output EOD (end-of-data) marker `~>' */
class ASCII85Encode: public PSEncoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
ASCII85Encode(GenBuffer::Writable &out_, unsigned maxcpl_);
virtual void vi_write(char const*buf, slen_t len);
protected:
void wencoded(char const *encoded);
void wout(PTS_UINT32_T buf_);
unsigned maxcpl;
/** Number of digits available in this line */
GenBuffer::Writable &out;
unsigned ascii85breaklen;
unsigned ascii85left;
PTS_UINT32_T ascii85buf;
char *obuf, *obufend, *op;
char dscst; /* For converting `%%' to `% %' to avoid DSC parser errors */
};
/** Doesn't output EOD (end-of-data) marker `>' */
class RunLengthEncode: public PSEncoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
RunLengthEncode(GenBuffer::Writable &out_, slen_t RecordSize_);
virtual void vi_write(char const*buf, slen_t len);
protected:
slen_t recordsize;
GenBuffer::Writable &out;
// char *obuf, *obufend, *op;
slen_t record_left;
unsigned saved_c, saved_rep;
/** size == header+buffer+EOD */
char saved[130];
};
static int gen_write(char *block, unsigned len, void *zfile);
#if USE_BUILTIN_ZIP
#include "pts_defl.h" /* Imp: because pts_defl_interface :-( */
#if OBJDEP
# warning REQUIRES: pts_defl
#endif
class FlateEncode: public PSEncoder {
#if PTS_DEFL_RIPPED_ZLIB /* Dat: defined in pts_defl.h */
public:
/** @param level: 1..9: 9==highest compression */
FlateEncode(GenBuffer::Writable &out_, unsigned level_);
virtual ~FlateEncode() { zlib_deflateEnd(&zs); } /* Dat: ==Z_OK check (for unflushed buffers) omitted */
virtual void vi_write(char const*buf, slen_t len);
protected:
/** Formerly only one instance of FlateEncode was allowed.
* It exists <=> loced==true
*/
// static bool locked;
/** Writable that this filter writes to */
GenBuffer::Writable &out;
char workspace[ZLIB_DEFLATE_WORKSPACESIZE_MIN]; /* big, about 270k */
char obuf[4096];
/*struct*/ z_stream zs;
#else /* old, ripped from Info-ZIP 2.2 */
public:
/** @param level: 1..9: 9==highest compression */
FlateEncode(GenBuffer::Writable &out_, unsigned level_);
virtual ~FlateEncode() { if (fs!=NULLP) fs->delete2(fs); }
virtual void vi_write(char const*buf, slen_t len);
static void *gen_malloc(unsigned n);
static void gen_free(void *p);
protected:
/** Formerly only one instance of FlateEncode was allowed.
* It exists <=> loced==true
*/
// static bool locked;
/** Writable that this filter writes to */
GenBuffer::Writable &out;
#if SIZEOF_INT>2
typedef unsigned s_t;
#else
typedef unsigned short s_t;
#endif
/** Adler32 checksum */
s_t s1, s2;
bool had_header;
struct pts_defl_interface* fs;
#endif /* else PTS_DEFL_RIPPED_ZLIB */
};
#endif
/** Just store the data in Flate (ZLIB) format, no real compression. Adds
* about 3 bytes of overhead per 65535 bytes (compression ratio:
* 100.004578%)
*/
class FlateStoreEncode: public PSEncoder {
public:
/** @param level: 1..9: 9==highest compression */
FlateStoreEncode(GenBuffer::Writable &out_);
inline virtual ~FlateStoreEncode() {}
virtual void vi_write(char const*buf, slen_t len);
protected:
GenBuffer::Writable &out;
#if SIZEOF_INT>2
typedef unsigned s_t;
#else
typedef unsigned short s_t;
#endif
/** Adler32 checksum */
s_t s1, s2;
bool had_header;
/** Number of bytes already in buf */
unsigned abuflen;
/** Max: 65535 */
#if HAVE_STATIC_CONST
static const unsigned ABUFSIZE=65535;
#else
#define ABUFSIZE 65535
#endif
/** Should really not allocate a FlateStoreEncode on the stack. */
char abuf[ABUFSIZE+5];
};
#if USE_BUILTIN_FAXE
#include "pts_fax.h"
#if OBJDEP
# warning REQUIRES: pts_faxe
#endif
class CCITTFaxEncode: public PSEncoder {
public:
CCITTFaxEncode(GenBuffer::Writable &out_, slendiff_t K, slen_t Columns, bool EndOfLine, bool BlackIs1);
virtual void vi_write(char const*buf, slen_t len);
protected:
GenBuffer::Writable &out;
stream_CFE_state sCFEs;
unsigned char rbuf[4096];
unsigned char wbuf[4096];
stream_cursor_read r;
stream_cursor_write w;
unsigned char *hard, *rlimit;
static void*gen_xalloc(unsigned n);
static void gen_free(void *ptr);
static void gen_memset(void *s, int c, unsigned n);
static void gen_memcpy(void *dest, const void *src, unsigned n);
};
#endif
#if USE_BUILTIN_LZW
#include "pts_lzw.h" /* Imp: because pts_lzw_state :-( */
#if OBJDEP
# warning REQUIRES: pts_lzw
#endif
class LZWEncode: public PSEncoder {
public:
LZWEncode(GenBuffer::Writable &out_);
virtual void vi_write(char const*buf, slen_t len);
protected:
GenBuffer::Writable &out;
struct pts_lzw_state fs;
};
#endif
/**
* Reporting of GS errors is somewhat dump: the actual message isn't reported,
* only the fact that something went wrong.
* Imp: force a no-error trailer output by gs, and check that
*/
class GSEncode: public PSEncoder {
public:
/** @param filter_psname is a full-featured PostScript *Encode filter
* specification string, for example: "<</Effort 5>>/FlateEncode" or
* "0/RunLengthEncode" or "72 pop/ASCIIHexEncode"; will be surrounded as
* `currentfile ... filter'
*/
GSEncode(GenBuffer::Writable &out_, char const*filter_psname);
inline virtual ~GSEncode() {}
/* vvv Imp: correct these */
virtual void vi_write(char const*buf, slen_t len);
protected:
class P: public Filter::PipeE {
protected: virtual void vi_check();
public: P(GenBuffer::Writable &out_, char const*filter_psname);
};
/** We need this delegator because `delete ...' won't work with multiple
* inheritance. (?? )
*/
P p;
};
class CjpegEncode: public PSEncoder {
public:
/** @param filter_psname is a full-featured PostScript *Encode filter
* specification string, for example: "<</Effort 5>>/FlateEncode" or
* "0/RunLengthEncode" or "72 pop/ASCIIHexEncode"; will be surrounded as
* `currentfile ... filter'
*/
CjpegEncode(GenBuffer::Writable &out_, char const*filter_psname, slen_t Columns, slen_t Rows, bool rgbp_, unsigned char quality);
inline virtual ~CjpegEncode() {}
virtual void vi_write(char const*buf, slen_t len);
protected:
class P: public Filter::PipeE { public:
// protected: virtual void vi_check();
P(GenBuffer::Writable &out_, slen_t Columns, slen_t Rows, bool rgbp_, unsigned char quality);
protected: /* Not needed: protected -> public: pacify VC6.0 */
virtual void vi_copy(FILE *f);
bool rgbp;
};
/** We need this delegator because `delete ...' won't work with multiple
* inheritance. (?? )
*/
P p;
};
#if !USE_BUILTIN_LZW
class Lzw_codecEncode: public PSEncoder {
public:
/** @param filter_psname is a full-featured PostScript *Encode filter
* specification string, for example: "<</Effort 5>>/FlateEncode" or
* "0/RunLengthEncode" or "72 pop/ASCIIHexEncode"; will be surrounded as
* `currentfile ... filter'
*/
Lzw_codecEncode(GenBuffer::Writable &out_, char const*filter_psname);
inline virtual ~Lzw_codecEncode() {}
virtual void vi_write(char const*buf, slen_t len);
protected:
class P: public Filter::PipeE { public:
// protected: virtual void vi_check();
P(GenBuffer::Writable &out_);
protected:
// virtual void vi_copy(FILE *f);
};
/** We need this delegator because `delete ...' won't work with multiple
* inheritance. (?? )
*/
P p;
};
#endif
class TIFFPredictor2: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
TIFFPredictor2(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
PTS_UINT32_T h;
unsigned char *obuf, *op, bpc, cpp;
slen_t rlen;
GenBuffer::Writable &out;
};
class PNGPredictorNone: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
PNGPredictorNone(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
slen_t rlen, opleft;
GenBuffer::Writable &out;
};
class PNGPredictorSub: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
PNGPredictorSub(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
PTS_UINT32_T h;
unsigned char *obuf, *op;
slen_t rlen;
GenBuffer::Writable &out;
unsigned char bpccpp;
};
class PNGPredictorUp: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
PNGPredictorUp(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
unsigned char *obuf, *op, *oq;
slen_t rlen;
GenBuffer::Writable &out;
};
class PNGPredictorAverage: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
PNGPredictorAverage(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
PTS_UINT32_T h/*, g*/;
unsigned char *obuf, *op, *oq;
slen_t rlen;
GenBuffer::Writable &out;
unsigned char bpccpp;
};
class PNGPredictorPaeth: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
PNGPredictorPaeth(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
PTS_UINT32_T h, g;
unsigned char *obuf, *op, *oq;
slen_t rlen;
GenBuffer::Writable &out;
unsigned char bpccpp;
};
/** This class implements inferior predictor autoselection heuristics.
* Please use PNGPredictorAuto instead.
* Imp: code reuse with PNGPredictorAuto
*/
class PNGPredictorAutoBadSigned: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
PNGPredictorAutoBadSigned(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
PTS_UINT32_T h, g;
unsigned char *obuf, *o_prior, *o_0, *o_1, *o_2, *o_3, *o_4, *oo[5];
slen_t rlen;
GenBuffer::Writable &out;
unsigned char bpccpp;
slen_t opleft;
};
/** This class implements inferior predictor autoselection heuristics.
* Please use PNGPredictorAuto instead.
* Imp: code reuse with PNGPredictorAuto
*/
class PNGPredictorAutoBadUnsigned: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
PNGPredictorAutoBadUnsigned(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
PTS_UINT32_T h, g;
unsigned char *obuf, *o_prior, *o_0, *o_1, *o_2, *o_3, *o_4, *oo[5];
slen_t rlen;
GenBuffer::Writable &out;
unsigned char bpccpp;
slen_t opleft;
};
/** This class implements to so-called ``minimum sum of absolute differences''
* predictior autoselection heuristics, the same as what pngwutil.c
* contains in function png_write_find_filter() in libpng 1.2.20. (See that
* function for a discussion of other heuristics. A summary of this heuristics:
* we find which method provides the smallest value when summing the absolute
* values of the distances from zero, using anything >= 128 as negative
* numbers.
*/
class PNGPredictorAuto: public Encoder {
public:
/** @param maxcpl_: maximum # hex digits per line, should be even */
PNGPredictorAuto(GenBuffer::Writable &out_, unsigned char bpc_, slen_t columns_, unsigned char cpp_);
virtual void vi_write(char const*buf, slen_t len);
protected:
PTS_UINT32_T h, g;
unsigned char *obuf, *o_prior, *o_0, *o_1, *o_2, *o_3, *o_4, *oo[5];
slen_t rlen;
GenBuffer::Writable &out;
unsigned char bpccpp;
slen_t opleft;
};
/* --- */
FlateStoreEncode::FlateStoreEncode(GenBuffer::Writable &out_)
:out(out_)
,s1(1)
,s2(0)
,had_header(false)
,abuflen(0)
{}
#if 0
/** 0x7801: ZLIB header signaling fastest compression
* 0: 2 bits: DEFLATE block header signaling stored (uncompressed) block +
* 6 bits of padding.
*/
char FlateStoreEncode::header[3]= { 0x78, 1, 0 };
#endif
void FlateStoreEncode::vi_write(char const*buf, slen_t len) {
register s_t sold;
register char const*p=buf; char const*pend=p+len;
(void)sold;
if (len==0) { /* EOF: flush and send trailer */
/* Dat: Last block has to be written even if it's empty. */
if (!had_header) { out.vi_write("\x78\x01", 2); had_header=true; }
abuf[0]=(char)1; /* Last, stored block with padding */
abuf[1]=abuflen; abuf[2]=abuflen>>8;
abuf[3]=~(abuflen); abuf[4]=~(abuflen>>8);
out.vi_write(abuf, abuflen+5);
if (s1>=65521) s1-=65521;
if (s2>=65521) s2-=65521;
unsigned char trailer[4];
trailer[0]=s2>>8; trailer[1]=s2&255; trailer[2]=s1>>8; trailer[3]=s1&255;
out.vi_write((char const*)trailer,4);
out.vi_write(0,0); /* Signal EOF */
return;
}
/* From rfc1950.txt:
Adler-32 is composed of two sums accumulated per byte: s1 is
the sum of all bytes, s2 is the sum of all s1 values. Both sums
are done modulo 65521. s1 is initialized to 1, s2 to zero. The
Adler-32 checksum is stored as s2*65536 + s1 in most-
significant-byte first (network) order.
*/
/* Update Adler-32 checksum */
while (p!=pend) {
#if SIZEOF_INT>2
if ((s1+=*(unsigned char const*)p)>=65521) s1-=65521;
if ((s2+=s1)>=65521) s2-=65521;
#elif SIZEOF_SHORT==2
sold=s1;
if ((s1+=*(unsigned char const*)p))<sold) s1+=15; /* 15==65536-21 */
sold=s2;
s2=(s2+s1)&0xffff;
if ((s2+=s1)<sold) s2+=15;
#else
/* vvv 0xffff is needed since unsigned short may be > 0..65535 */
sold=s1;
s1=(s1+*(unsigned char const*)p)&0xffff;
if (s1<sold) s1+=15; /* 15==65536-21 */
sold=s2;
s2=(s2+s1)&0xffff;
if (s2<sold) s2+=15;
#endif
p++;
}
// fprintf(stderr, "len=%u\n", len);
unsigned abufleft;
while ((abufleft=ABUFSIZE-abuflen)<len) {
// putchar('.');
// fprintf(stderr, "ABUFSIZE=%u abuflen=%u\n", ABUFSIZE, abuflen);
memcpy(abuf+abuflen+5, buf, abufleft);
abuf[0]=0; /* Stored block with padding */
abuf[1]=(char)ABUFSIZE; abuf[2]=(char)(ABUFSIZE>>8);
abuf[3]=(char)~(ABUFSIZE); abuf[4]=(char)~(ABUFSIZE>>8);
if (!had_header) { out.vi_write("\x78\x01", 2); had_header=true; }
/* fprintf(stderr,"%02x %02x", abuf[1], abuf[2]); */
out.vi_write(abuf, ABUFSIZE+5); /* emit next stored block with header */
abuflen=0;
len-=abufleft;
buf+=abufleft;
}
// putchar('X');
memcpy(abuf+abuflen+5, buf, len);
abuflen+=len;
/* Now abuf is possibly full. That is intentional, so we will be able to
* emit a full last block instead of an empty one.
*/
}
/* --- */
ASCIIHexEncode::ASCIIHexEncode(GenBuffer::Writable &out_, unsigned maxcpl_)
:maxcpl(maxcpl_)
,curcpl(0)
,out(out_) {}
void ASCIIHexEncode::vi_write(char const*buf, slen_t len) {
/* Imp: buffering (1K etc.) */
static char const hextable []="0123456789abcdef";
char obuf[3];
obuf[0]='\n';
if (len==0) { out.vi_write(">",1); out.vi_write(0,0); }
else while (len--!=0) {
obuf[1]=hextable[(*(unsigned char const*)buf)>>4];
obuf[2]=hextable[(*(unsigned char const*)buf)&15];
if (curcpl>=maxcpl) { curcpl=2; out.vi_write(obuf, 3); }
else { curcpl+=2; out.vi_write(obuf+1, 2); }
buf++;
}
}
/* --- */
ASCII85Encode::ASCII85Encode(GenBuffer::Writable &out_, unsigned maxcpl_)
:maxcpl(maxcpl_)
,out(out_)
,ascii85breaklen(maxcpl_)
,ascii85left(4)
,dscst(1) {
obufend=(op=obuf=new char[4096])+4096;
}
void ASCII85Encode::wencoded(char const *cp) {
for (; *cp!='\0'; ) {
if (op==obufend) out.vi_write(op=obuf, obufend-obuf);
// if (*cp<='!') { fprintf(stderr, "e=%d.\n", cp-encoded); }
assert(*cp>='!');
assert(*cp<='~');
if (dscst) {
if (dscst == 1) {
dscst = (*cp == '%') ? 2 : 0;
} else { /* if (dscst == 2) { */
if (*cp == '%') {
if (--ascii85breaklen == 0) {
*op++ = '\n';
ascii85breaklen = maxcpl;
} else {
/* Add space for `% %' instead of `%%' at BOL. */
*op++ = ' ';
}
if (op==obufend) out.vi_write(op=obuf, obufend-obuf);
}
dscst = 0;
}
}
*op++=*cp++;
if (--ascii85breaklen == 0) {
if (op==obufend) out.vi_write(op=obuf, obufend-obuf);
*op++='\n';
ascii85breaklen = maxcpl;
dscst = 1;
}
} /* NEXT */
}
void ASCII85Encode::vi_write(char const*buf, slen_t len) {
if (len==0) {
char encoded[6];
assert(ascii85left<=4);
if (ascii85left!=4) {
PTS_UINT32_T buf_=ascii85buf<<8*ascii85left;
PTS_UINT32_T q;
unsigned w1;
q = buf_ / ((PTS_UINT32_T)85*85*85*85); /* actually only a byte */
assert(q<=85);
encoded[0] = q + '!';
buf_ -= q * ((PTS_UINT32_T)85*85*85*85); q = buf_ / ((PTS_UINT32_T)85*85*85);
encoded[1] = q + '!';
buf_ -= q * ((PTS_UINT32_T)85*85*85); q = buf_ / (85*85);
encoded[2] = q + '!';
w1 = (unsigned) (buf_ - q*(PTS_UINT32_T)(85*85));
assert(w1/85<85);
encoded[3] = (w1 / 85) + '!';
encoded[4] = (w1 % 85) + '!';
encoded[5-ascii85left] = '\0';
wencoded(encoded);
} /* IF */
if (op!=obuf) out.vi_write(obuf, op-obuf); /* flush buffer cache */
out.vi_write("~>",2); out.vi_write(0,0);
delete [] obuf;
obuf=(char*)NULLP;
} else {
assert(obuf!=NULLP);
register PTS_UINT32_T abuf=ascii85buf;
register unsigned aleft=ascii85left;
assert(aleft>=1 && aleft<=4);
do {
while (len!=0 && aleft!=0) {
abuf=(abuf<<8)+*(unsigned char const*)buf++; len--; aleft--;
}
if (aleft!=0) break;
wout(abuf);
aleft=4;
} while (len!=0);
ascii85buf=abuf; ascii85left=aleft;
}
}
void ASCII85Encode::wout(PTS_UINT32_T buf_) {
char encoded[6];
if (buf_ != (PTS_UINT32_T)0) {
PTS_UINT32_T q;
unsigned w1;
q = buf_ / ((PTS_UINT32_T)85*85*85*85); /* actually only a byte */
encoded[0] = q + '!';
buf_ -= q * ((PTS_UINT32_T)85*85*85*85); q = buf_ / ((PTS_UINT32_T)85*85*85);
encoded[1] = q + '!';
buf_ -= q * ((PTS_UINT32_T)85*85*85); q = buf_ / (85*85);
encoded[2] = q + '!';
w1 = (unsigned) (buf_ - q*(PTS_UINT32_T)(85*85));
encoded[3] = (w1 / 85) + '!';
encoded[4] = (w1 % 85) + '!';
encoded[5] = '\0';
} else {
encoded[0] = 'z', encoded[1] = '\0';
}
wencoded(encoded);
}
/* --- */
RunLengthEncode::RunLengthEncode(GenBuffer::Writable &out_, slen_t RecordSize_)
:recordsize(RecordSize_==0?(slen_t)-1:RecordSize_)
,out(out_) {
record_left=recordsize;
// obufend=(op=obuf=new char[4096])+4096; /* Imp: implement write buffering */
saved_c=saved_rep=0;
}
void RunLengthEncode::vi_write(char const*buf, slen_t len) {
unsigned j, umax;
char b;
if (len==0) { /* handle EOF */
if (saved_rep!=0) {
assert(saved_rep>=2);
(saved+1)[-1]=257-saved_rep;
(saved+1)[1]=(char)128; /* EOD */
out.vi_write((saved+1)-1,3);
// fprintf(stderr,"rd=%u\n",saved_rep);
} else if (saved_c!=0) {
(saved+1)[-1]=saved_c-1;
(saved+1)[saved_c]=(char)128; /* EOD */
out.vi_write((saved+1)-1, saved_c+2);
// fprintf(stderr,"re=%u\n",saved_c);
} else {
(saved+1)[-1]=(char)128;
out.vi_write((saved+1)-1, 1);
}
out.vi_write(0,0); /* propagate EOF */
record_left=0; /* signal that no further data will be accepted */
return;
}
again:
assert(record_left>=1);
assert(len>=1);
/* Imp: locally cache vars saved* */
j=0;
if (saved_c==0) {
saved_rep=0; saved_c=1; b=(saved+1)[0]=*buf++; len--;
if (0==--record_left) goto put_norep;
if (0==len) return;
goto yes;
}
if (saved_c==1 && saved_rep==0) { yes:
if (*buf++==(saved+1)[0]) {
saved_rep=2; len--;
if (0==--record_left) goto put_rep;
} else {
(saved+1)[1]=buf[-1]; saved_c=2; len--;
if (0==--record_left) goto put_norep;
}
if (0==len) return;
}
assert(record_left>=1);
assert(len>=1);
assert((saved_rep==0 && saved_c>=2) || (saved_rep>=2 && saved_c==1));
if (saved_rep!=0) { /* Try to increase the repeating sequence */
assert(saved_rep>=2);
assert(saved_c==1);
assert(len>=1);
b=(saved+1)[0];
umax=len>128?128:len; if (umax>record_left) umax=record_left;
/* fprintf(stderr,"um1=%u\n", umax); */
if (umax>128-saved_rep) umax=128-saved_rep;
assert(umax>=1);
j=0; while (j!=umax && buf[j]==b) { j++; saved_rep++; }
if (j!=len || saved_rep==128) {
put_rep: /* Found a maximal repeat width */
(saved+1)[-1]=257-saved_rep;
out.vi_write((saved+1)-1,2);
/* fprintf(stderr,"ra=%u\n",saved_rep); */
if ((record_left-=j)==0) record_left=recordsize;
buf+=j;
saved_c=saved_rep=0;
if (0==(len-=j)) return;
goto again;
} /* Current repeat width can be further increased */
} else { /* Try to increase the non-repeating sequence */
assert(saved_c>=2);
if (buf[0]==(saved+1)[saved_c-1]) { /* this decision might be sub-optimal */
saved_c--;
/* Now: saved_c: non-repeat length, >=1 */
(saved+1)[-1]=saved_c-1;
out.vi_write((saved+1)-1, saved_c+1);
/* fprintf(stderr,"rb=%u\n",saved_c); */
// record_left++; /* because of saved_c--; but we would increase it later anyway */
// buf+=saved_c;
(saved+1)[0]=buf[0]; /* first matching char-pair data */
saved_c=1; saved_rep=2; /* make the new block a >=2 repeat */
record_left--; buf++;
if (0==--len) return;
goto again;
}
(saved+1)[saved_c++]=buf[0];
//record_left--;
//buf++;
//len--;
//if (saved_c==128) goto put_norep;
//if (0==len) return;
umax=len>128?128:len; if (umax>record_left) umax=record_left;
if (umax>128-saved_c) umax=128-saved_c;
/* fprintf(stderr,"um2=%u\n", umax); */
assert(umax>=1);
j=1; while (j!=umax && buf[j]!=buf[j-1]) (saved+1)[saved_c++]=buf[j++];
if (j!=len || saved_c==128) {
put_norep: /* Found a maximal non-repeat width */
(saved+1)[-1]=saved_c-1;
out.vi_write((saved+1)-1, saved_c+1);
/* fprintf(stderr,"rc=%u\n",saved_c); */
if ((record_left-=j)==0) record_left=recordsize;
buf+=j;
saved_c=saved_rep=0;
if (0==(len-=j)) return;
goto again;
} /* Current non-repeat width can be further increased */
}
assert(j==len);
record_left-=j;
assert(saved_rep<128);
assert(saved_c<128);
}
/* --- */
#if USE_BUILTIN_ZIP
// bool FlateEncode::locked=false;
#if PTS_DEFL_RIPPED_ZLIB
FlateEncode::FlateEncode(GenBuffer::Writable &out_, unsigned level_)
:out(out_) {
// assert(!locked); locked /* locking is not necessary anymore */
// pts_deflate_init(&fs); /* obsolete */
zs.total_in=0;
zs.total_out=0;
zs.workspace=workspace;
zs.msg=(char*)0;
zs.state=(struct zlib_internal_state*)0;
zs.data_type=Z_UNKNOWN; /* Imp: do we have to initialize it? */
assert(zlib_deflate_workspacesize()+(unsigned)0<sizeof(workspace) && "Flate workspace too small");
if (Z_OK!=zlib_deflateInit(&zs, level_))
Error::sev(Error::EERROR) << "Flate init error (out of memory?)" << (Error*)0;
}
void FlateEncode::vi_write(char const*buf, slen_t len) {
slen_t got, zgot;
/* fprintf(stderr,"wcall\n"); */
zs.next_in=(unsigned char*)const_cast<char*>(buf); zs.avail_in=len;
if (len==0) { /* flush all output */
do { /* SUXX: C compiler should emit a warning: while (1) { ... } while(...); */
zs.next_out=(unsigned char*)obuf; zs.avail_out=sizeof(obuf);
/* fprintf(stderr,"wdone zai=%d zao=%d\n", zs.avail_in, zs.avail_out); */
if (Z_STREAM_END!=(zgot=zlib_deflate(&zs, Z_FINISH)) && Z_OK!=zgot)
Error::sev(Error::EERROR) << "Flate close error: " << zs.msg << (Error*)0;
got=sizeof(obuf)-zs.avail_out;
/* fprintf(stderr, "got=%u zgot=%d Z_OK=%d\n", got, zgot, Z_OK); */
if (got>0) out.vi_write(obuf, got);
} while (zgot==Z_OK);
/* Dat: zlib_deflateEnd() will be called in the destructur */
out.vi_write(0,0); /* Signal EOF */
/* Dat: zlib_deflate() adds RFC 1950 header and adler32 checksum automatically */
} else {
do {
/* fprintf(stderr,"writ\n"); */
zs.next_out=(unsigned char*)obuf; zs.avail_out=sizeof(obuf);
if (Z_OK!=zlib_deflate(&zs, 0))
Error::sev(Error::EERROR) << "Flate write error: " << zs.msg << (Error*)0;
if (0<(got=sizeof(obuf)-zs.avail_out)) out.vi_write(obuf, got);
} while (0!=zs.avail_in);
}
}
#else
FlateEncode::FlateEncode(GenBuffer::Writable &out_, unsigned level_)
:out(out_)
,s1(1)
,s2(0)
,had_header(false) {
// assert(!locked); locked /* locking is not necessary anymore */
// pts_deflate_init(&fs); /* obsolete */
fs=pts_defl_new(
/*zpfwrite=*/ gen_write,
/*zpfmalloc=*/ gen_malloc,
/*zpffree=*/ gen_free,
/*pack_level=*/ level_,
/*zfile=*/ (void*)&out_
);
if (fs==NULL) Error::sev(Error::EERROR) << "Flate init error (out of memory?)" << (Error*)0;
}
void *FlateEncode::gen_malloc(unsigned n) {
return operator new(n);
// return new char[n];
}
void FlateEncode::gen_free(void *p) {
/*return*/ operator delete(p);
// delete [] (char*)p;
}
void FlateEncode::vi_write(char const*buf, slen_t len) {
register s_t sold;
register char const*p=buf; char const*pend=p+len;
(void)sold;
if (!had_header) {
out.vi_write("\x78\xda",2); /* ZLIB (RFC 1950): max compression header */
had_header=true;
}
if (len==0) { /* EOF: send trailer */
fs->deflate2(0,0,fs); /* Let the compressor flush its buffers. */
if (fs->err!=0) Error::sev(Error::EERROR) << "Flate compression error" << (Error*)0;
fs->delete2(fs);
fs=(struct pts_defl_interface*)NULL;
if (s1>=65521) s1-=65521;
if (s2>=65521) s2-=65521;
unsigned char trailer[4];
trailer[0]=s2>>8; trailer[1]=s2&255; trailer[2]=s1>>8; trailer[3]=s1&255;
out.vi_write((char const*)trailer,4);
out.vi_write(0,0); /* Signal EOF */
return;
}
assert(fs!=NULL);
/* From rfc1950.txt:
Adler-32 is composed of two sums accumulated per byte: s1 is
the sum of all bytes, s2 is the sum of all s1 values. Both sums
are done modulo 65521. s1 is initialized to 1, s2 to zero. The
Adler-32 checksum is stored as s2*65536 + s1 in most-
significant-byte first (network) order.
*/
/* Update Adler-32 checksum */
while (p!=pend) {
#if SIZEOF_INT>2
if ((s1+=*(unsigned char const*)p)>=65521) s1-=65521;
if ((s2+=s1)>=65521) s2-=65521;
#elif SIZEOF_SHORT==2
sold=s1;
if ((s1+=*(unsigned char const*)p))<sold) s1+=15; /* 15==65536-21 */
sold=s2;
s2=(s2+s1)&0xffff;
if ((s2+=s1)<sold) s2+=15;
#else
/* vvv 0xffff is needed since unsigned short may be > 0..65535 */
sold=s1;
s1=(s1+*(unsigned char const*)p)&0xffff;
if (s1<sold) s1+=15; /* 15==65536-21 */
sold=s2;
s2=(s2+s1)&0xffff;
if (s2<sold) s2+=15;
#endif
p++;
}
while (len>=0x8000) { fs->deflate2(const_cast<char*>(buf),0x8000, fs); len-=0x8000; buf+=0x8000; }
if (len!=0) fs->deflate2(const_cast<char*>(buf),len, fs);
}
#endif /* PTS_DEFL_RIPPED_ZLIB */
#endif /* USE_BUILTIN_ZIP */
int /*FlateEncode::*/gen_write(char *block, unsigned len, void *zfile) {
static_cast<GenBuffer::Writable*>(zfile)->vi_write(block, len);
return 0;
}
/* --- */
#if USE_BUILTIN_FAXE
void* CCITTFaxEncode::gen_xalloc(unsigned n) {
return operator new(n);
// void *ret; if ((ret=malloc(n))==0) abort(); return ret;
}
void CCITTFaxEncode::gen_free(void *ptr) {
/*return*/ operator delete(ptr);
// free(ptr);
}
void CCITTFaxEncode::gen_memset(void *s, int c, unsigned n) {
/*return*/ memset(s,c,n);
}
void CCITTFaxEncode::gen_memcpy(void *dest, const void *src, unsigned n) {
/*return*/ memcpy(dest, src, n);
}
CCITTFaxEncode::CCITTFaxEncode(GenBuffer::Writable &out_, slendiff_t K, slen_t Columns, bool EndOfLine, bool BlackIs1): out(out_) {
sCFEs.memset_=gen_memset;
sCFEs.xalloc_=gen_xalloc;
sCFEs.free_=gen_free;
sCFEs.memcpy_=gen_memcpy;
s_CFE_template.set_defaults((stream_state*)&sCFEs);
sCFEs.K=K;
sCFEs.Columns=Columns;
sCFEs.EndOfLine=EndOfLine;
sCFEs.BlackIs1=BlackIs1;
const int cf_max_height=(unsigned)-1/2-100; /* Dat: was slen_t */
if (sCFEs.K < -cf_max_height || sCFEs.K > cf_max_height /* Dat: .K is an int */
|| sCFEs.Columns < 0 || sCFEs.Columns > cfe_max_width /* Dat: .Columns is an int */
|| sCFEs.Rows < 0 || sCFEs.Rows > cf_max_height /* Dat: .Rows is an int */
|| sCFEs.DamagedRowsBeforeError < 0
|| sCFEs.DamagedRowsBeforeError > cf_max_height /* Dat: .DamagedRowsBeforeError is an int */
|| sCFEs.DecodedByteAlign < 1 || sCFEs.DecodedByteAlign > 16
|| (sCFEs.DecodedByteAlign & (sCFEs.DecodedByteAlign - 1)) != 0
) Error::sev(Error::EERROR) << "pts_fax: invalid params" << (Error*)0;
if (0!=s_CFE_template.init((stream_state*)&sCFEs))
Error::sev(Error::EERROR) << "pts_fax: init failed" << (Error*)0;
#if __CHECKER__
memset(&r, 0, sizeof(r));
memset(&w, 0, sizeof(w));
#endif
r.ptr=rlimit=rbuf-1;
hard=rbuf+sizeof(rbuf)-1;
assert(hard-r.ptr>=(int)s_CFE_template.min_in_size);
}
void CCITTFaxEncode::vi_write(char const*buf, slen_t len) {
int pog;
// unsigned char *save_wptr;
if (len==0) {
r.limit=rlimit;
do {
w.ptr=wbuf-1;
w.limit=wbuf+sizeof(wbuf)-1;
assert(w.limit-w.ptr>=(int)s_CFE_template.min_out_size);
pog=s_CFE_template.process((stream_state*)&sCFEs, &r, &w, /*last:*/ true);
// fprintf(stderr, "pog=%d write=%d last=%d\n", pog, w.ptr-(wbuf-1), true);
assert(pog!=PTSFAX_ERRC); /* /CCITTFaxEncode filter must accept any input */
assert(pog!=PTSFAX_EOFC); /* /CCITTFaxEncode filter doesn't have EOD markers */
if (w.ptr!=wbuf-1) out.vi_write((char const*)wbuf, w.ptr-(wbuf-1));
} while (pog==1);
s_CFE_template.release((stream_state*)&sCFEs);
out.vi_write(0,0); /* propagate EOF */
return;
}
while (len!=0) {
assert(r.ptr==rbuf-1);
assert(hard>rlimit);
unsigned clen=hard-rlimit;
if (clen>len) clen=len;
assert(clen>0);
// fprintf(stderr, "clen=%u\n", clen);
memcpy(rlimit+1, buf, clen);
rlimit+=clen;
buf+=clen;
len-=clen;
/* if (r.ptr==rlimit) break; */
r.limit=rlimit;
do {
w.ptr=wbuf-1;
w.limit=wbuf+sizeof(wbuf)-1;
assert(w.limit-w.ptr>=(int)s_CFE_template.min_out_size);
pog=s_CFE_template.process((stream_state*)&sCFEs, &r, &w, /*last:*/ false);
// fprintf(stderr, "len=%d pog=%d write=%d last=%d\n", len, pog, w.ptr-(wbuf-1), false);
assert(pog!=PTSFAX_ERRC); /* /CCITTFaxEncode filter must accept any input */
assert(pog!=PTSFAX_EOFC); /* /CCITTFaxEncode filter doesn't have EOD markers */
if (w.ptr!=wbuf-1) out.vi_write((char const*)wbuf, w.ptr-(wbuf-1));
} while (pog==1);
// assert(pog!=1); /* not true: output space is enough (sizeof(wbuf)>min_out_size) */
assert(pog==0); /* more input is needed */
if (r.ptr!=rbuf-1) {
// fprintf(stderr, "limit=%d\n", rlimit-r.ptr);
memmove(rbuf, r.ptr+1, rlimit-r.ptr);
rlimit=rbuf-1+(rlimit-r.ptr);
r.ptr=rbuf-1;
}
}
// fprintf(stderr, "done\n");
}
#endif /* USE_BUILTIN_FAXE */
/* --- */