/src/openssl111/crypto/comp/c_zlib.c

Source (jump to first uncovered line)
/*
 * Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/objects.h>
#include "internal/comp.h"
#include <openssl/err.h>
#include "crypto/cryptlib.h"
#include "internal/bio.h"
#include "comp_local.h"

COMP_METHOD *COMP_zlib(void);

static COMP_METHOD zlib_method_nozlib = {
    NID_undef,
    "(undef)",
    NULL,
    NULL,
    NULL,
    NULL,
};

#ifndef ZLIB
# undef ZLIB_SHARED
#else

# include <zlib.h>

static int zlib_stateful_init(COMP_CTX *ctx);
static void zlib_stateful_finish(COMP_CTX *ctx);
static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
                                        unsigned int olen, unsigned char *in,
                                        unsigned int ilen);
static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
                                      unsigned int olen, unsigned char *in,
                                      unsigned int ilen);

/* memory allocations functions for zlib initialisation */
static void *zlib_zalloc(void *opaque, unsigned int no, unsigned int size)
{
    void *p;

    p = OPENSSL_zalloc(no * size);
    return p;
}

static void zlib_zfree(void *opaque, void *address)
{
    OPENSSL_free(address);
}


static COMP_METHOD zlib_stateful_method = {
    NID_zlib_compression,
    LN_zlib_compression,
    zlib_stateful_init,
    zlib_stateful_finish,
    zlib_stateful_compress_block,
    zlib_stateful_expand_block
};

/*
 * When OpenSSL is built on Windows, we do not want to require that
 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
 * work.  Therefore, all ZLIB routines are loaded at run time
 * and we do not link to a .LIB file when ZLIB_SHARED is set.
 */
# if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
#  include <windows.h>
# endif                         /* !(OPENSSL_SYS_WINDOWS ||
                                 * OPENSSL_SYS_WIN32) */

# ifdef ZLIB_SHARED
#  include "internal/dso.h"

/* Function pointers */
typedef int (*compress_ft) (Bytef *dest, uLongf * destLen,
                            const Bytef *source, uLong sourceLen);
typedef int (*inflateEnd_ft) (z_streamp strm);
typedef int (*inflate_ft) (z_streamp strm, int flush);
typedef int (*inflateInit__ft) (z_streamp strm,
                                const char *version, int stream_size);
typedef int (*deflateEnd_ft) (z_streamp strm);
typedef int (*deflate_ft) (z_streamp strm, int flush);
typedef int (*deflateInit__ft) (z_streamp strm, int level,
                                const char *version, int stream_size);
typedef const char *(*zError__ft) (int err);
static compress_ft p_compress = NULL;
static inflateEnd_ft p_inflateEnd = NULL;
static inflate_ft p_inflate = NULL;
static inflateInit__ft p_inflateInit_ = NULL;
static deflateEnd_ft p_deflateEnd = NULL;
static deflate_ft p_deflate = NULL;
static deflateInit__ft p_deflateInit_ = NULL;
static zError__ft p_zError = NULL;

static int zlib_loaded = 0;     /* only attempt to init func pts once */
static DSO *zlib_dso = NULL;

#  define compress                p_compress
#  define inflateEnd              p_inflateEnd
#  define inflate                 p_inflate
#  define inflateInit_            p_inflateInit_
#  define deflateEnd              p_deflateEnd
#  define deflate                 p_deflate
#  define deflateInit_            p_deflateInit_
#  define zError                  p_zError
# endif                         /* ZLIB_SHARED */

struct zlib_state {
    z_stream istream;
    z_stream ostream;
};

static int zlib_stateful_init(COMP_CTX *ctx)
{
    int err;
    struct zlib_state *state = OPENSSL_zalloc(sizeof(*state));

    if (state == NULL)
        goto err;

    state->istream.zalloc = zlib_zalloc;
    state->istream.zfree = zlib_zfree;
    state->istream.opaque = Z_NULL;
    state->istream.next_in = Z_NULL;
    state->istream.next_out = Z_NULL;
    err = inflateInit_(&state->istream, ZLIB_VERSION, sizeof(z_stream));
    if (err != Z_OK)
        goto err;

    state->ostream.zalloc = zlib_zalloc;
    state->ostream.zfree = zlib_zfree;
    state->ostream.opaque = Z_NULL;
    state->ostream.next_in = Z_NULL;
    state->ostream.next_out = Z_NULL;
    err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION,
                       ZLIB_VERSION, sizeof(z_stream));
    if (err != Z_OK)
        goto err;

    ctx->data = state;
    return 1;
 err:
    OPENSSL_free(state);
    return 0;
}

static void zlib_stateful_finish(COMP_CTX *ctx)
{
    struct zlib_state *state = ctx->data;
    inflateEnd(&state->istream);
    deflateEnd(&state->ostream);
    OPENSSL_free(state);
}

static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
                                        unsigned int olen, unsigned char *in,
                                        unsigned int ilen)
{
    int err = Z_OK;
    struct zlib_state *state = ctx->data;

    if (state == NULL)
        return -1;

    state->ostream.next_in = in;
    state->ostream.avail_in = ilen;
    state->ostream.next_out = out;
    state->ostream.avail_out = olen;
    if (ilen > 0)
        err = deflate(&state->ostream, Z_SYNC_FLUSH);
    if (err != Z_OK)
        return -1;
    return olen - state->ostream.avail_out;
}

static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
                                      unsigned int olen, unsigned char *in,
                                      unsigned int ilen)
{
    int err = Z_OK;
    struct zlib_state *state = ctx->data;

    if (state == NULL)
        return 0;

    state->istream.next_in = in;
    state->istream.avail_in = ilen;
    state->istream.next_out = out;
    state->istream.avail_out = olen;
    if (ilen > 0)
        err = inflate(&state->istream, Z_SYNC_FLUSH);
    if (err != Z_OK)
        return -1;
    return olen - state->istream.avail_out;
}

#endif

COMP_METHOD *COMP_zlib(void)
{
    COMP_METHOD *meth = &zlib_method_nozlib;

#ifdef ZLIB_SHARED
    /* LIBZ may be externally defined, and we should respect that value */
# ifndef LIBZ
#  if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
#   define LIBZ "ZLIB1"
#  elif defined(OPENSSL_SYS_VMS)
#   define LIBZ "LIBZ"
#  else
#   define LIBZ "z"
#  endif
# endif

    if (!zlib_loaded) {
        zlib_dso = DSO_load(NULL, LIBZ, NULL, 0);
        if (zlib_dso != NULL) {
            p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress");
            p_inflateEnd
                = (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd");
            p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate");
            p_inflateInit_
                = (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_");
            p_deflateEnd
                = (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd");
            p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate");
            p_deflateInit_
                = (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_");
            p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError");

            if (p_compress && p_inflateEnd && p_inflate
                && p_inflateInit_ && p_deflateEnd
                && p_deflate && p_deflateInit_ && p_zError)
                zlib_loaded++;

            if (!OPENSSL_init_crypto(OPENSSL_INIT_ZLIB, NULL)) {
                comp_zlib_cleanup_int();
                return meth;
            }
            if (zlib_loaded)
                meth = &zlib_stateful_method;
        }
    }
#endif
#if defined(ZLIB)
    meth = &zlib_stateful_method;
#endif

    return meth;
}

void comp_zlib_cleanup_int(void)
{
#ifdef ZLIB_SHARED
    DSO_free(zlib_dso);
    zlib_dso = NULL;
#endif
}

#ifdef ZLIB

/* Zlib based compression/decompression filter BIO */

typedef struct {
    unsigned char *ibuf;        /* Input buffer */
    int ibufsize;               /* Buffer size */
    z_stream zin;               /* Input decompress context */
    unsigned char *obuf;        /* Output buffer */
    int obufsize;               /* Output buffer size */
    unsigned char *optr;        /* Position in output buffer */
    int ocount;                 /* Amount of data in output buffer */
    int odone;                  /* deflate EOF */
    int comp_level;             /* Compression level to use */
    z_stream zout;              /* Output compression context */
} BIO_ZLIB_CTX;

# define ZLIB_DEFAULT_BUFSIZE 1024

static int bio_zlib_new(BIO *bi);
static int bio_zlib_free(BIO *bi);
static int bio_zlib_read(BIO *b, char *out, int outl);
static int bio_zlib_write(BIO *b, const char *in, int inl);
static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp);

static const BIO_METHOD bio_meth_zlib = {
    BIO_TYPE_COMP,
    "zlib",
    /* TODO: Convert to new style write function */
    bwrite_conv,
    bio_zlib_write,
    /* TODO: Convert to new style read function */
    bread_conv,
    bio_zlib_read,
    NULL,                      /* bio_zlib_puts, */
    NULL,                      /* bio_zlib_gets, */
    bio_zlib_ctrl,
    bio_zlib_new,
    bio_zlib_free,
    bio_zlib_callback_ctrl
};

const BIO_METHOD *BIO_f_zlib(void)
{
    return &bio_meth_zlib;
}

static int bio_zlib_new(BIO *bi)
{
    BIO_ZLIB_CTX *ctx;
# ifdef ZLIB_SHARED
    (void)COMP_zlib();
    if (!zlib_loaded) {
        COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
        return 0;
    }
# endif
    ctx = OPENSSL_zalloc(sizeof(*ctx));
    if (ctx == NULL) {
        COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
        return 0;
    }
    ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
    ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
    ctx->zin.zalloc = Z_NULL;
    ctx->zin.zfree = Z_NULL;
    ctx->zout.zalloc = Z_NULL;
    ctx->zout.zfree = Z_NULL;
    ctx->comp_level = Z_DEFAULT_COMPRESSION;
    BIO_set_init(bi, 1);
    BIO_set_data(bi, ctx);

    return 1;
}

static int bio_zlib_free(BIO *bi)
{
    BIO_ZLIB_CTX *ctx;
    if (!bi)
        return 0;
    ctx = BIO_get_data(bi);
    if (ctx->ibuf) {
        /* Destroy decompress context */
        inflateEnd(&ctx->zin);
        OPENSSL_free(ctx->ibuf);
    }
    if (ctx->obuf) {
        /* Destroy compress context */
        deflateEnd(&ctx->zout);
        OPENSSL_free(ctx->obuf);
    }
    OPENSSL_free(ctx);
    BIO_set_data(bi, NULL);
    BIO_set_init(bi, 0);

    return 1;
}

static int bio_zlib_read(BIO *b, char *out, int outl)
{
    BIO_ZLIB_CTX *ctx;
    int ret;
    z_stream *zin;
    BIO *next = BIO_next(b);

    if (!out || !outl)
        return 0;
    ctx = BIO_get_data(b);
    zin = &ctx->zin;
    BIO_clear_retry_flags(b);
    if (!ctx->ibuf) {
        ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
        if (ctx->ibuf == NULL) {
            COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
            return 0;
        }
        inflateInit(zin);
        zin->next_in = ctx->ibuf;
        zin->avail_in = 0;
    }

    /* Copy output data directly to supplied buffer */
    zin->next_out = (unsigned char *)out;
    zin->avail_out = (unsigned int)outl;
    for (;;) {
        /* Decompress while data available */
        while (zin->avail_in) {
            ret = inflate(zin, 0);
            if ((ret != Z_OK) && (ret != Z_STREAM_END)) {
                COMPerr(COMP_F_BIO_ZLIB_READ, COMP_R_ZLIB_INFLATE_ERROR);
                ERR_add_error_data(2, "zlib error:", zError(ret));
                return 0;
            }
            /* If EOF or we've read everything then return */
            if ((ret == Z_STREAM_END) || !zin->avail_out)
                return outl - zin->avail_out;
        }

        /*
         * No data in input buffer try to read some in, if an error then
         * return the total data read.
         */
        ret = BIO_read(next, ctx->ibuf, ctx->ibufsize);
        if (ret <= 0) {
            /* Total data read */
            int tot = outl - zin->avail_out;
            BIO_copy_next_retry(b);
            if (ret < 0)
                return (tot > 0) ? tot : ret;
            return tot;
        }
        zin->avail_in = ret;
        zin->next_in = ctx->ibuf;
    }
}

static int bio_zlib_write(BIO *b, const char *in, int inl)
{
    BIO_ZLIB_CTX *ctx;
    int ret;
    z_stream *zout;
    BIO *next = BIO_next(b);

    if (!in || !inl)
        return 0;
    ctx = BIO_get_data(b);
    if (ctx->odone)
        return 0;
    zout = &ctx->zout;
    BIO_clear_retry_flags(b);
    if (!ctx->obuf) {
        ctx->obuf = OPENSSL_malloc(ctx->obufsize);
        /* Need error here */
        if (ctx->obuf == NULL) {
            COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
            return 0;
        }
        ctx->optr = ctx->obuf;
        ctx->ocount = 0;
        deflateInit(zout, ctx->comp_level);
        zout->next_out = ctx->obuf;
        zout->avail_out = ctx->obufsize;
    }
    /* Obtain input data directly from supplied buffer */
    zout->next_in = (void *)in;
    zout->avail_in = inl;
    for (;;) {
        /* If data in output buffer write it first */
        while (ctx->ocount) {
            ret = BIO_write(next, ctx->optr, ctx->ocount);
            if (ret <= 0) {
                /* Total data written */
                int tot = inl - zout->avail_in;
                BIO_copy_next_retry(b);
                if (ret < 0)
                    return (tot > 0) ? tot : ret;
                return tot;
            }
            ctx->optr += ret;
            ctx->ocount -= ret;
        }

        /* Have we consumed all supplied data? */
        if (!zout->avail_in)
            return inl;

        /* Compress some more */

        /* Reset buffer */
        ctx->optr = ctx->obuf;
        zout->next_out = ctx->obuf;
        zout->avail_out = ctx->obufsize;
        /* Compress some more */
        ret = deflate(zout, 0);
        if (ret != Z_OK) {
            COMPerr(COMP_F_BIO_ZLIB_WRITE, COMP_R_ZLIB_DEFLATE_ERROR);
            ERR_add_error_data(2, "zlib error:", zError(ret));
            return 0;
        }
        ctx->ocount = ctx->obufsize - zout->avail_out;
    }
}

static int bio_zlib_flush(BIO *b)
{
    BIO_ZLIB_CTX *ctx;
    int ret;
    z_stream *zout;
    BIO *next = BIO_next(b);

    ctx = BIO_get_data(b);
    /* If no data written or already flush show success */
    if (!ctx->obuf || (ctx->odone && !ctx->ocount))
        return 1;
    zout = &ctx->zout;
    BIO_clear_retry_flags(b);
    /* No more input data */
    zout->next_in = NULL;
    zout->avail_in = 0;
    for (;;) {
        /* If data in output buffer write it first */
        while (ctx->ocount) {
            ret = BIO_write(next, ctx->optr, ctx->ocount);
            if (ret <= 0) {
                BIO_copy_next_retry(b);
                return ret;
            }
            ctx->optr += ret;
            ctx->ocount -= ret;
        }
        if (ctx->odone)
            return 1;

        /* Compress some more */

        /* Reset buffer */
        ctx->optr = ctx->obuf;
        zout->next_out = ctx->obuf;
        zout->avail_out = ctx->obufsize;
        /* Compress some more */
        ret = deflate(zout, Z_FINISH);
        if (ret == Z_STREAM_END)
            ctx->odone = 1;
        else if (ret != Z_OK) {
            COMPerr(COMP_F_BIO_ZLIB_FLUSH, COMP_R_ZLIB_DEFLATE_ERROR);
            ERR_add_error_data(2, "zlib error:", zError(ret));
            return 0;
        }
        ctx->ocount = ctx->obufsize - zout->avail_out;
    }
}

static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
{
    BIO_ZLIB_CTX *ctx;
    int ret, *ip;
    int ibs, obs;
    BIO *next = BIO_next(b);

    if (next == NULL)
        return 0;
    ctx = BIO_get_data(b);
    switch (cmd) {

    case BIO_CTRL_RESET:
        ctx->ocount = 0;
        ctx->odone = 0;
        ret = 1;
        break;

    case BIO_CTRL_FLUSH:
        ret = bio_zlib_flush(b);
        if (ret > 0)
            ret = BIO_flush(next);
        break;

    case BIO_C_SET_BUFF_SIZE:
        ibs = -1;
        obs = -1;
        if (ptr != NULL) {
            ip = ptr;
            if (*ip == 0)
                ibs = (int)num;
            else
                obs = (int)num;
        } else {
            ibs = (int)num;
            obs = ibs;
        }

        if (ibs != -1) {
            OPENSSL_free(ctx->ibuf);
            ctx->ibuf = NULL;
            ctx->ibufsize = ibs;
        }

        if (obs != -1) {
            OPENSSL_free(ctx->obuf);
            ctx->obuf = NULL;
            ctx->obufsize = obs;
        }
        ret = 1;
        break;

    case BIO_C_DO_STATE_MACHINE:
        BIO_clear_retry_flags(b);
        ret = BIO_ctrl(next, cmd, num, ptr);
        BIO_copy_next_retry(b);
        break;

    case BIO_CTRL_WPENDING:
        if (ctx->obuf == NULL)
            return 0;

        if (ctx->odone) {
            ret = ctx->ocount;
        } else {
            ret = ctx->ocount;
            if (ret == 0)
                /* Unknown amount pending but we are not finished */
                ret = 1;
        }
        if (ret == 0)
            ret = BIO_ctrl(next, cmd, num, ptr);
        break;

    case BIO_CTRL_PENDING:
        ret = ctx->zin.avail_in;
        if (ret == 0)
            ret = BIO_ctrl(next, cmd, num, ptr);
        break;

    default:
        ret = BIO_ctrl(next, cmd, num, ptr);
        break;

    }

    return ret;
}

static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
    BIO *next = BIO_next(b);
    if (next == NULL)
        return 0;
    return BIO_callback_ctrl(next, cmd, fp);
}

#endif

Coverage Report

Created: 2023-09-25 06:45

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the OpenSSL license (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#include <stdio.h>
11		#include <stdlib.h>
12		#include <string.h>
13		#include <openssl/objects.h>
14		#include "internal/comp.h"
15		#include <openssl/err.h>
16		#include "crypto/cryptlib.h"
17		#include "internal/bio.h"
18		#include "comp_local.h"
19
20		COMP_METHOD *COMP_zlib(void);
21
22		static COMP_METHOD zlib_method_nozlib = {
23		NID_undef,
24		"(undef)",
25		NULL,
26		NULL,
27		NULL,
28		NULL,
29		};
30
31		#ifndef ZLIB
32		# undef ZLIB_SHARED
33		#else
34
35		# include <zlib.h>
36
37		static int zlib_stateful_init(COMP_CTX *ctx);
38		static void zlib_stateful_finish(COMP_CTX *ctx);
39		static int zlib_stateful_compress_block(COMP_CTX ctx, unsigned char out,
40		unsigned int olen, unsigned char *in,
41		unsigned int ilen);
42		static int zlib_stateful_expand_block(COMP_CTX ctx, unsigned char out,
43		unsigned int olen, unsigned char *in,
44		unsigned int ilen);
45
46		/* memory allocations functions for zlib initialisation */
47		static void zlib_zalloc(void opaque, unsigned int no, unsigned int size)
48		{
49		void *p;
50
51		p = OPENSSL_zalloc(no * size);
52		return p;
53		}
54
55		static void zlib_zfree(void opaque, void address)
56		{
57		OPENSSL_free(address);
58		}
59
60
61		static COMP_METHOD zlib_stateful_method = {
62		NID_zlib_compression,
63		LN_zlib_compression,
64		zlib_stateful_init,
65		zlib_stateful_finish,
66		zlib_stateful_compress_block,
67		zlib_stateful_expand_block
68		};
69
70		/*
71		* When OpenSSL is built on Windows, we do not want to require that
72		* the ZLIB.DLL be available in order for the OpenSSL DLLs to
73		* work. Therefore, all ZLIB routines are loaded at run time
74		* and we do not link to a .LIB file when ZLIB_SHARED is set.
75		*/
76		# if defined(OPENSSL_SYS_WINDOWS) \|\| defined(OPENSSL_SYS_WIN32)
77		# include <windows.h>
78		# endif /* !(OPENSSL_SYS_WINDOWS \|\|
79		* OPENSSL_SYS_WIN32) */
80
81		# ifdef ZLIB_SHARED
82		# include "internal/dso.h"
83
84		/* Function pointers */
85		typedef int (compress_ft) (Bytef dest, uLongf * destLen,
86		const Bytef *source, uLong sourceLen);
87		typedef int (*inflateEnd_ft) (z_streamp strm);
88		typedef int (*inflate_ft) (z_streamp strm, int flush);
89		typedef int (*inflateInit__ft) (z_streamp strm,
90		const char *version, int stream_size);
91		typedef int (*deflateEnd_ft) (z_streamp strm);
92		typedef int (*deflate_ft) (z_streamp strm, int flush);
93		typedef int (*deflateInit__ft) (z_streamp strm, int level,
94		const char *version, int stream_size);
95		typedef const char (zError__ft) (int err);
96		static compress_ft p_compress = NULL;
97		static inflateEnd_ft p_inflateEnd = NULL;
98		static inflate_ft p_inflate = NULL;
99		static inflateInit__ft p_inflateInit_ = NULL;
100		static deflateEnd_ft p_deflateEnd = NULL;
101		static deflate_ft p_deflate = NULL;
102		static deflateInit__ft p_deflateInit_ = NULL;
103		static zError__ft p_zError = NULL;
104
105		static int zlib_loaded = 0; /* only attempt to init func pts once */
106		static DSO *zlib_dso = NULL;
107
108		# define compress p_compress
109		# define inflateEnd p_inflateEnd
110		# define inflate p_inflate
111		# define inflateInit_ p_inflateInit_
112		# define deflateEnd p_deflateEnd
113		# define deflate p_deflate
114		# define deflateInit_ p_deflateInit_
115		# define zError p_zError
116		# endif /* ZLIB_SHARED */
117
118		struct zlib_state {
119		z_stream istream;
120		z_stream ostream;
121		};
122
123		static int zlib_stateful_init(COMP_CTX *ctx)
124		{
125		int err;
126		struct zlib_state state = OPENSSL_zalloc(sizeof(state));
127
128		if (state == NULL)
129		goto err;
130
131		state->istream.zalloc = zlib_zalloc;
132		state->istream.zfree = zlib_zfree;
133		state->istream.opaque = Z_NULL;
134		state->istream.next_in = Z_NULL;
135		state->istream.next_out = Z_NULL;
136		err = inflateInit_(&state->istream, ZLIB_VERSION, sizeof(z_stream));
137		if (err != Z_OK)
138		goto err;
139
140		state->ostream.zalloc = zlib_zalloc;
141		state->ostream.zfree = zlib_zfree;
142		state->ostream.opaque = Z_NULL;
143		state->ostream.next_in = Z_NULL;
144		state->ostream.next_out = Z_NULL;
145		err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION,
146		ZLIB_VERSION, sizeof(z_stream));
147		if (err != Z_OK)
148		goto err;
149
150		ctx->data = state;
151		return 1;
152		err:
153		OPENSSL_free(state);
154		return 0;
155		}
156
157		static void zlib_stateful_finish(COMP_CTX *ctx)
158		{
159		struct zlib_state *state = ctx->data;
160		inflateEnd(&state->istream);
161		deflateEnd(&state->ostream);
162		OPENSSL_free(state);
163		}
164
165		static int zlib_stateful_compress_block(COMP_CTX ctx, unsigned char out,
166		unsigned int olen, unsigned char *in,
167		unsigned int ilen)
168		{
169		int err = Z_OK;
170		struct zlib_state *state = ctx->data;
171
172		if (state == NULL)
173		return -1;
174
175		state->ostream.next_in = in;
176		state->ostream.avail_in = ilen;
177		state->ostream.next_out = out;
178		state->ostream.avail_out = olen;
179		if (ilen > 0)
180		err = deflate(&state->ostream, Z_SYNC_FLUSH);
181		if (err != Z_OK)
182		return -1;
183		return olen - state->ostream.avail_out;
184		}
185
186		static int zlib_stateful_expand_block(COMP_CTX ctx, unsigned char out,
187		unsigned int olen, unsigned char *in,
188		unsigned int ilen)
189		{
190		int err = Z_OK;
191		struct zlib_state *state = ctx->data;
192
193		if (state == NULL)
194		return 0;
195
196		state->istream.next_in = in;
197		state->istream.avail_in = ilen;
198		state->istream.next_out = out;
199		state->istream.avail_out = olen;
200		if (ilen > 0)
201		err = inflate(&state->istream, Z_SYNC_FLUSH);
202		if (err != Z_OK)
203		return -1;
204		return olen - state->istream.avail_out;
205		}
206
207		#endif
208
209		COMP_METHOD *COMP_zlib(void)
210	18	{
211	18	COMP_METHOD *meth = &zlib_method_nozlib;
212
213		#ifdef ZLIB_SHARED
214		/* LIBZ may be externally defined, and we should respect that value */
215		# ifndef LIBZ
216		# if defined(OPENSSL_SYS_WINDOWS) \|\| defined(OPENSSL_SYS_WIN32)
217		# define LIBZ "ZLIB1"
218		# elif defined(OPENSSL_SYS_VMS)
219		# define LIBZ "LIBZ"
220		# else
221		# define LIBZ "z"
222		# endif
223		# endif
224
225		if (!zlib_loaded) {
226		zlib_dso = DSO_load(NULL, LIBZ, NULL, 0);
227		if (zlib_dso != NULL) {
228		p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress");
229		p_inflateEnd
230		= (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd");
231		p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate");
232		p_inflateInit_
233		= (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_");
234		p_deflateEnd
235		= (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd");
236		p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate");
237		p_deflateInit_
238		= (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_");
239		p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError");
240
241		if (p_compress && p_inflateEnd && p_inflate
242		&& p_inflateInit_ && p_deflateEnd
243		&& p_deflate && p_deflateInit_ && p_zError)
244		zlib_loaded++;
245
246		if (!OPENSSL_init_crypto(OPENSSL_INIT_ZLIB, NULL)) {
247		comp_zlib_cleanup_int();
248		return meth;
249		}
250		if (zlib_loaded)
251		meth = &zlib_stateful_method;
252		}
253		}
254		#endif
255		#if defined(ZLIB)
256		meth = &zlib_stateful_method;
257		#endif
258
259	18	return meth;
260	18	}
261
262		void comp_zlib_cleanup_int(void)
263	0	{
264		#ifdef ZLIB_SHARED
265		DSO_free(zlib_dso);
266		zlib_dso = NULL;
267		#endif
268	0	}
269
270		#ifdef ZLIB
271
272		/* Zlib based compression/decompression filter BIO */
273
274		typedef struct {
275		unsigned char ibuf; / Input buffer */
276		int ibufsize; /* Buffer size */
277		z_stream zin; /* Input decompress context */
278		unsigned char obuf; / Output buffer */
279		int obufsize; /* Output buffer size */
280		unsigned char optr; / Position in output buffer */
281		int ocount; /* Amount of data in output buffer */
282		int odone; /* deflate EOF */
283		int comp_level; /* Compression level to use */
284		z_stream zout; /* Output compression context */
285		} BIO_ZLIB_CTX;
286
287		# define ZLIB_DEFAULT_BUFSIZE 1024
288
289		static int bio_zlib_new(BIO *bi);
290		static int bio_zlib_free(BIO *bi);
291		static int bio_zlib_read(BIO b, char out, int outl);
292		static int bio_zlib_write(BIO b, const char in, int inl);
293		static long bio_zlib_ctrl(BIO b, int cmd, long num, void ptr);
294		static long bio_zlib_callback_ctrl(BIO b, int cmd, BIO_info_cb fp);
295
296		static const BIO_METHOD bio_meth_zlib = {
297		BIO_TYPE_COMP,
298		"zlib",
299		/* TODO: Convert to new style write function */
300		bwrite_conv,
301		bio_zlib_write,
302		/* TODO: Convert to new style read function */
303		bread_conv,
304		bio_zlib_read,
305		NULL, /* bio_zlib_puts, */
306		NULL, /* bio_zlib_gets, */
307		bio_zlib_ctrl,
308		bio_zlib_new,
309		bio_zlib_free,
310		bio_zlib_callback_ctrl
311		};
312
313		const BIO_METHOD *BIO_f_zlib(void)
314		{
315		return &bio_meth_zlib;
316		}
317
318		static int bio_zlib_new(BIO *bi)
319		{
320		BIO_ZLIB_CTX *ctx;
321		# ifdef ZLIB_SHARED
322		(void)COMP_zlib();
323		if (!zlib_loaded) {
324		COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
325		return 0;
326		}
327		# endif
328		ctx = OPENSSL_zalloc(sizeof(*ctx));
329		if (ctx == NULL) {
330		COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
331		return 0;
332		}
333		ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
334		ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
335		ctx->zin.zalloc = Z_NULL;
336		ctx->zin.zfree = Z_NULL;
337		ctx->zout.zalloc = Z_NULL;
338		ctx->zout.zfree = Z_NULL;
339		ctx->comp_level = Z_DEFAULT_COMPRESSION;
340		BIO_set_init(bi, 1);
341		BIO_set_data(bi, ctx);
342
343		return 1;
344		}
345
346		static int bio_zlib_free(BIO *bi)
347		{
348		BIO_ZLIB_CTX *ctx;
349		if (!bi)
350		return 0;
351		ctx = BIO_get_data(bi);
352		if (ctx->ibuf) {
353		/* Destroy decompress context */
354		inflateEnd(&ctx->zin);
355		OPENSSL_free(ctx->ibuf);
356		}
357		if (ctx->obuf) {
358		/* Destroy compress context */
359		deflateEnd(&ctx->zout);
360		OPENSSL_free(ctx->obuf);
361		}
362		OPENSSL_free(ctx);
363		BIO_set_data(bi, NULL);
364		BIO_set_init(bi, 0);
365
366		return 1;
367		}
368
369		static int bio_zlib_read(BIO b, char out, int outl)
370		{
371		BIO_ZLIB_CTX *ctx;
372		int ret;
373		z_stream *zin;
374		BIO *next = BIO_next(b);
375
376		if (!out \|\| !outl)
377		return 0;
378		ctx = BIO_get_data(b);
379		zin = &ctx->zin;
380		BIO_clear_retry_flags(b);
381		if (!ctx->ibuf) {
382		ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
383		if (ctx->ibuf == NULL) {
384		COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
385		return 0;
386		}
387		inflateInit(zin);
388		zin->next_in = ctx->ibuf;
389		zin->avail_in = 0;
390		}
391
392		/* Copy output data directly to supplied buffer */
393		zin->next_out = (unsigned char *)out;
394		zin->avail_out = (unsigned int)outl;
395		for (;;) {
396		/* Decompress while data available */
397		while (zin->avail_in) {
398		ret = inflate(zin, 0);
399		if ((ret != Z_OK) && (ret != Z_STREAM_END)) {
400		COMPerr(COMP_F_BIO_ZLIB_READ, COMP_R_ZLIB_INFLATE_ERROR);
401		ERR_add_error_data(2, "zlib error:", zError(ret));
402		return 0;
403		}
404		/* If EOF or we've read everything then return */
405		if ((ret == Z_STREAM_END) \|\| !zin->avail_out)
406		return outl - zin->avail_out;
407		}
408
409		/*
410		* No data in input buffer try to read some in, if an error then
411		* return the total data read.
412		*/
413		ret = BIO_read(next, ctx->ibuf, ctx->ibufsize);
414		if (ret <= 0) {
415		/* Total data read */
416		int tot = outl - zin->avail_out;
417		BIO_copy_next_retry(b);
418		if (ret < 0)
419		return (tot > 0) ? tot : ret;
420		return tot;
421		}
422		zin->avail_in = ret;
423		zin->next_in = ctx->ibuf;
424		}
425		}
426
427		static int bio_zlib_write(BIO b, const char in, int inl)
428		{
429		BIO_ZLIB_CTX *ctx;
430		int ret;
431		z_stream *zout;
432		BIO *next = BIO_next(b);
433
434		if (!in \|\| !inl)
435		return 0;
436		ctx = BIO_get_data(b);
437		if (ctx->odone)
438		return 0;
439		zout = &ctx->zout;
440		BIO_clear_retry_flags(b);
441		if (!ctx->obuf) {
442		ctx->obuf = OPENSSL_malloc(ctx->obufsize);
443		/* Need error here */
444		if (ctx->obuf == NULL) {
445		COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
446		return 0;
447		}
448		ctx->optr = ctx->obuf;
449		ctx->ocount = 0;
450		deflateInit(zout, ctx->comp_level);
451		zout->next_out = ctx->obuf;
452		zout->avail_out = ctx->obufsize;
453		}
454		/* Obtain input data directly from supplied buffer */
455		zout->next_in = (void *)in;
456		zout->avail_in = inl;
457		for (;;) {
458		/* If data in output buffer write it first */
459		while (ctx->ocount) {
460		ret = BIO_write(next, ctx->optr, ctx->ocount);
461		if (ret <= 0) {
462		/* Total data written */
463		int tot = inl - zout->avail_in;
464		BIO_copy_next_retry(b);
465		if (ret < 0)
466		return (tot > 0) ? tot : ret;
467		return tot;
468		}
469		ctx->optr += ret;
470		ctx->ocount -= ret;
471		}
472
473		/* Have we consumed all supplied data? */
474		if (!zout->avail_in)
475		return inl;
476
477		/* Compress some more */
478
479		/* Reset buffer */
480		ctx->optr = ctx->obuf;
481		zout->next_out = ctx->obuf;
482		zout->avail_out = ctx->obufsize;
483		/* Compress some more */
484		ret = deflate(zout, 0);
485		if (ret != Z_OK) {
486		COMPerr(COMP_F_BIO_ZLIB_WRITE, COMP_R_ZLIB_DEFLATE_ERROR);
487		ERR_add_error_data(2, "zlib error:", zError(ret));
488		return 0;
489		}
490		ctx->ocount = ctx->obufsize - zout->avail_out;
491		}
492		}
493
494		static int bio_zlib_flush(BIO *b)
495		{
496		BIO_ZLIB_CTX *ctx;
497		int ret;
498		z_stream *zout;
499		BIO *next = BIO_next(b);
500
501		ctx = BIO_get_data(b);
502		/* If no data written or already flush show success */
503		if (!ctx->obuf \|\| (ctx->odone && !ctx->ocount))
504		return 1;
505		zout = &ctx->zout;
506		BIO_clear_retry_flags(b);
507		/* No more input data */
508		zout->next_in = NULL;
509		zout->avail_in = 0;
510		for (;;) {
511		/* If data in output buffer write it first */
512		while (ctx->ocount) {
513		ret = BIO_write(next, ctx->optr, ctx->ocount);
514		if (ret <= 0) {
515		BIO_copy_next_retry(b);
516		return ret;
517		}
518		ctx->optr += ret;
519		ctx->ocount -= ret;
520		}
521		if (ctx->odone)
522		return 1;
523
524		/* Compress some more */
525
526		/* Reset buffer */
527		ctx->optr = ctx->obuf;
528		zout->next_out = ctx->obuf;
529		zout->avail_out = ctx->obufsize;
530		/* Compress some more */
531		ret = deflate(zout, Z_FINISH);
532		if (ret == Z_STREAM_END)
533		ctx->odone = 1;
534		else if (ret != Z_OK) {
535		COMPerr(COMP_F_BIO_ZLIB_FLUSH, COMP_R_ZLIB_DEFLATE_ERROR);
536		ERR_add_error_data(2, "zlib error:", zError(ret));
537		return 0;
538		}
539		ctx->ocount = ctx->obufsize - zout->avail_out;
540		}
541		}
542
543		static long bio_zlib_ctrl(BIO b, int cmd, long num, void ptr)
544		{
545		BIO_ZLIB_CTX *ctx;
546		int ret, *ip;
547		int ibs, obs;
548		BIO *next = BIO_next(b);
549
550		if (next == NULL)
551		return 0;
552		ctx = BIO_get_data(b);
553		switch (cmd) {
554
555		case BIO_CTRL_RESET:
556		ctx->ocount = 0;
557		ctx->odone = 0;
558		ret = 1;
559		break;
560
561		case BIO_CTRL_FLUSH:
562		ret = bio_zlib_flush(b);
563		if (ret > 0)
564		ret = BIO_flush(next);
565		break;
566
567		case BIO_C_SET_BUFF_SIZE:
568		ibs = -1;
569		obs = -1;
570		if (ptr != NULL) {
571		ip = ptr;
572		if (*ip == 0)
573		ibs = (int)num;
574		else
575		obs = (int)num;
576		} else {
577		ibs = (int)num;
578		obs = ibs;
579		}
580
581		if (ibs != -1) {
582		OPENSSL_free(ctx->ibuf);
583		ctx->ibuf = NULL;
584		ctx->ibufsize = ibs;
585		}
586
587		if (obs != -1) {
588		OPENSSL_free(ctx->obuf);
589		ctx->obuf = NULL;
590		ctx->obufsize = obs;
591		}
592		ret = 1;
593		break;
594
595		case BIO_C_DO_STATE_MACHINE:
596		BIO_clear_retry_flags(b);
597		ret = BIO_ctrl(next, cmd, num, ptr);
598		BIO_copy_next_retry(b);
599		break;
600
601		case BIO_CTRL_WPENDING:
602		if (ctx->obuf == NULL)
603		return 0;
604
605		if (ctx->odone) {
606		ret = ctx->ocount;
607		} else {
608		ret = ctx->ocount;
609		if (ret == 0)
610		/* Unknown amount pending but we are not finished */
611		ret = 1;
612		}
613		if (ret == 0)
614		ret = BIO_ctrl(next, cmd, num, ptr);
615		break;
616
617		case BIO_CTRL_PENDING:
618		ret = ctx->zin.avail_in;
619		if (ret == 0)
620		ret = BIO_ctrl(next, cmd, num, ptr);
621		break;
622
623		default:
624		ret = BIO_ctrl(next, cmd, num, ptr);
625		break;
626
627		}
628
629		return ret;
630		}
631
632		static long bio_zlib_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
633		{
634		BIO *next = BIO_next(b);
635		if (next == NULL)
636		return 0;
637		return BIO_callback_ctrl(next, cmd, fp);
638		}
639
640		#endif