[thirdparty/openssl.git] / crypto / comp / c_zlib.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "objects.h"
#include "comp.h"

COMP_METHOD *COMP_zlib(void );

#ifndef ZLIB

static COMP_METHOD zlib_method={
	NID_undef,
	"(null)",
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	};

#else

#include <zlib.h>

static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
	unsigned int olen, unsigned char *in, unsigned int ilen);
static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
	unsigned int olen, unsigned char *in, unsigned int ilen);

static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
	uLong sourceLen);

static COMP_METHOD zlib_method={
	NID_zlib_compression,
	LN_zlib_compression,
	NULL,
	NULL,
	zlib_compress_block,
	zlib_expand_block,
	NULL,
	};

static int zlib_compress_block(ctx,out,olen,in,ilen)
COMP_CTX *ctx;
unsigned char *out;
unsigned int olen;
unsigned char *in;
unsigned int ilen;
	{
	unsigned long l;
	int i;
	int clear=1;

	if (ilen > 128)
		{
		out[0]=1;
		l=olen-1;
		i=compress(&(out[1]),&l,in,(unsigned long)ilen);
		if (i != Z_OK)
			return(-1);
		if (ilen > l)
			{
			clear=0;
			l++;
			}
		}
	if (clear)
		{
		out[0]=0;
		memcpy(&(out[1]),in,ilen);
		l=ilen+1;
		}
fprintf(stderr,"compress(%4d)->%4d %s\n",ilen,(int)l,(clear)?"clear":"zlib");
	return((int)l);
	}

static int zlib_expand_block(ctx,out,olen,in,ilen)
COMP_CTX *ctx;
unsigned char *out;
unsigned int olen;
unsigned char *in;
unsigned int ilen;
	{
	unsigned long l;
	int i;

	if (in[0])
		{
		l=olen;
		i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
		if (i != Z_OK)
			return(-1);
		}
	else
		{
		memcpy(out,&(in[1]),ilen-1);
		l=ilen-1;
		}
        fprintf(stderr,"expand  (%4d)->%4d %s\n",ilen,(int)l,in[0]?"zlib":"clear");
	return((int)l);
	}

static int zz_uncompress (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
    const Bytef *source;
    uLong sourceLen;
{
    z_stream stream;
    int err;

    stream.next_in = (Bytef*)source;
    stream.avail_in = (uInt)sourceLen;
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;

    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;

    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;

    err = inflateInit(&stream);
    if (err != Z_OK) return err;

    err = inflate(&stream, Z_FINISH);
    if (err != Z_STREAM_END) {
        inflateEnd(&stream);
        return err;
    }
    *destLen = stream.total_out;

    err = inflateEnd(&stream);
    return err;
}

#endif

COMP_METHOD *COMP_zlib()
	{
	return(&zlib_method);
	}
Commit	Line	Data
dfeab068 RE	1	#include <stdio.h>
	2	#include <stdlib.h>
	3	#include <string.h>
	4	#include "objects.h"
	5	#include "comp.h"
	6
	7	COMP_METHOD *COMP_zlib(void );
	8
	9	#ifndef ZLIB
	10
	11	static COMP_METHOD zlib_method={
	12	NID_undef,
	13	"(null)",
	14	NULL,
	15	NULL,
	16	NULL,
	17	NULL,
	18	NULL,
	19	};
	20
	21	#else
	22
	23	#include <zlib.h>
	24
	25	static int zlib_compress_block(COMP_CTX ctx, unsigned char out,
	26	unsigned int olen, unsigned char *in, unsigned int ilen);
	27	static int zlib_expand_block(COMP_CTX ctx, unsigned char out,
	28	unsigned int olen, unsigned char *in, unsigned int ilen);
	29
	30	static int zz_uncompress(Bytef dest, uLongf destLen, const Bytef *source,
	31	uLong sourceLen);
	32
	33	static COMP_METHOD zlib_method={
	34	NID_zlib_compression,
	35	LN_zlib_compression,
	36	NULL,
	37	NULL,
	38	zlib_compress_block,
	39	zlib_expand_block,
	40	NULL,
	41	};
	42
	43	static int zlib_compress_block(ctx,out,olen,in,ilen)
	44	COMP_CTX *ctx;
	45	unsigned char *out;
	46	unsigned int olen;
	47	unsigned char *in;
	48	unsigned int ilen;
	49	{
	50	unsigned long l;
	51	int i;
	52	int clear=1;
	53
	54	if (ilen > 128)
	55	{
	56	out[0]=1;
	57	l=olen-1;
	58	i=compress(&(out[1]),&l,in,(unsigned long)ilen);
	59	if (i != Z_OK)
	60	return(-1);
	61	if (ilen > l)
	62	{
	63	clear=0;
	64	l++;
65	}
66	}
67	if (clear)
68	{
69	out[0]=0;
70	memcpy(&(out[1]),in,ilen);
71	l=ilen+1;
72	}
73	fprintf(stderr,"compress(%4d)->%4d %s\n",ilen,(int)l,(clear)?"clear":"zlib");
74	return((int)l);
75	}
76
77	static int zlib_expand_block(ctx,out,olen,in,ilen)
78	COMP_CTX *ctx;
79	unsigned char *out;
80	unsigned int olen;
81	unsigned char *in;
82	unsigned int ilen;
83	{
84	unsigned long l;
85	int i;
86
87	if (in[0])
88	{
89	l=olen;
90	i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
91	if (i != Z_OK)
92	return(-1);
93	}
94	else
95	{
96	memcpy(out,&(in[1]),ilen-1);
97	l=ilen-1;
98	}
99	fprintf(stderr,"expand (%4d)->%4d %s\n",ilen,(int)l,in[0]?"zlib":"clear");
100	return((int)l);
101	}
102
103	static int zz_uncompress (dest, destLen, source, sourceLen)
104	Bytef *dest;
105	uLongf *destLen;
106	const Bytef *source;
107	uLong sourceLen;
108	{
109	z_stream stream;
110	int err;
111
112	stream.next_in = (Bytef*)source;
113	stream.avail_in = (uInt)sourceLen;
114	/* Check for source > 64K on 16-bit machine: */
115	if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
116
117	stream.next_out = dest;
118	stream.avail_out = (uInt)*destLen;
119	if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
120
121	stream.zalloc = (alloc_func)0;
122	stream.zfree = (free_func)0;
123
124	err = inflateInit(&stream);
125	if (err != Z_OK) return err;
126
127	err = inflate(&stream, Z_FINISH);
128	if (err != Z_STREAM_END) {
129	inflateEnd(&stream);
130	return err;
131	}
132	*destLen = stream.total_out;
133
134	err = inflateEnd(&stream);
135	return err;
136	}
137
138	#endif
139
140	COMP_METHOD *COMP_zlib()
141	{
142	return(&zlib_method);
143	}
144