pineapple-src/externals/libressl/crypto/comp/c_zlib.c

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2020-12-28 15:15:37 +00:00
/* $OpenBSD: c_zlib.c,v 1.20 2018/03/17 16:20:01 beck Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/objects.h>
#include <openssl/comp.h>
#include <openssl/err.h>
COMP_METHOD *COMP_zlib(void );
static COMP_METHOD zlib_method_nozlib = {
.type = NID_undef,
.name = "(undef)"
};
#ifdef ZLIB
#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 intialization */
static void*
zlib_zalloc(void* opaque, unsigned int no, unsigned int size)
{
return calloc(no, size);
}
static void
zlib_zfree(void* opaque, void* address)
{
free(address);
}
static COMP_METHOD zlib_stateful_method = {
.type = NID_zlib_compression,
.name = LN_zlib_compression,
.init = zlib_stateful_init,
.finish = zlib_stateful_finish,
.compress = zlib_stateful_compress_block,
.expand = zlib_stateful_expand_block
};
struct zlib_state {
z_stream istream;
z_stream ostream;
};
static int zlib_stateful_ex_idx = -1;
static int
zlib_stateful_init(COMP_CTX *ctx)
{
int err;
struct zlib_state *state = malloc(sizeof(struct zlib_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;
state->istream.avail_in = 0;
state->istream.avail_out = 0;
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;
state->ostream.avail_in = 0;
state->ostream.avail_out = 0;
err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION,
ZLIB_VERSION, sizeof(z_stream));
if (err != Z_OK)
goto err;
CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP, ctx, &ctx->ex_data);
CRYPTO_set_ex_data(&ctx->ex_data, zlib_stateful_ex_idx, state);
return 1;
err:
free(state);
return 0;
}
static void
zlib_stateful_finish(COMP_CTX *ctx)
{
struct zlib_state *state =
(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
zlib_stateful_ex_idx);
inflateEnd(&state->istream);
deflateEnd(&state->ostream);
free(state);
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP, ctx, &ctx->ex_data);
}
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 =
(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
zlib_stateful_ex_idx);
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;
#ifdef DEBUG_ZLIB
fprintf(stderr, "compress(%4d)->%4d %s\n",
ilen, olen - state->ostream.avail_out,
(ilen != olen - state->ostream.avail_out)?"zlib":"clear");
#endif
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 =
(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
zlib_stateful_ex_idx);
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;
#ifdef DEBUG_ZLIB
fprintf(stderr, "expand(%4d)->%4d %s\n",
ilen, olen - state->istream.avail_out,
(ilen != olen - state->istream.avail_out)?"zlib":"clear");
#endif
return olen - state->istream.avail_out;
}
#endif
COMP_METHOD *
COMP_zlib(void)
{
COMP_METHOD *meth = &zlib_method_nozlib;
#ifdef ZLIB
{
/* init zlib_stateful_ex_idx here so that in a multi-process
* application it's enough to intialize openssl before forking
* (idx will be inherited in all the children) */
if (zlib_stateful_ex_idx == -1) {
CRYPTO_w_lock(CRYPTO_LOCK_COMP);
if (zlib_stateful_ex_idx == -1)
zlib_stateful_ex_idx =
CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
0, NULL, NULL, NULL, NULL);
CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
if (zlib_stateful_ex_idx == -1)
goto err;
}
if (!OPENSSL_init_crypto(0, NULL))
goto err;
meth = &zlib_stateful_method;
}
err:
#endif
return (meth);
}
void
COMP_zlib_cleanup(void)
{
}
#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 BIO_METHOD bio_meth_zlib = {
.type = BIO_TYPE_COMP,
.name = "zlib",
.bwrite = bio_zlib_write,
.bread = bio_zlib_read,
.ctrl = bio_zlib_ctrl,
.create = bio_zlib_new,
.destroy = bio_zlib_free,
.callback_ctrl = bio_zlib_callback_ctrl
};
BIO_METHOD *
BIO_f_zlib(void)
{
return &bio_meth_zlib;
}
static int
bio_zlib_new(BIO *bi)
{
BIO_ZLIB_CTX *ctx;
ctx = malloc(sizeof(BIO_ZLIB_CTX));
if (!ctx) {
COMPerror(ERR_R_MALLOC_FAILURE);
return 0;
}
ctx->ibuf = NULL;
ctx->obuf = NULL;
ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
ctx->zin.zalloc = Z_NULL;
ctx->zin.zfree = Z_NULL;
ctx->zin.next_in = NULL;
ctx->zin.avail_in = 0;
ctx->zin.next_out = NULL;
ctx->zin.avail_out = 0;
ctx->zout.zalloc = Z_NULL;
ctx->zout.zfree = Z_NULL;
ctx->zout.next_in = NULL;
ctx->zout.avail_in = 0;
ctx->zout.next_out = NULL;
ctx->zout.avail_out = 0;
ctx->odone = 0;
ctx->comp_level = Z_DEFAULT_COMPRESSION;
bi->init = 1;
bi->ptr = (char *)ctx;
bi->flags = 0;
return 1;
}
static int
bio_zlib_free(BIO *bi)
{
BIO_ZLIB_CTX *ctx;
if (!bi)
return 0;
ctx = (BIO_ZLIB_CTX *)bi->ptr;
if (ctx->ibuf) {
/* Destroy decompress context */
inflateEnd(&ctx->zin);
free(ctx->ibuf);
}
if (ctx->obuf) {
/* Destroy compress context */
deflateEnd(&ctx->zout);
free(ctx->obuf);
}
free(ctx);
bi->ptr = NULL;
bi->init = 0;
bi->flags = 0;
return 1;
}
static int
bio_zlib_read(BIO *b, char *out, int outl)
{
BIO_ZLIB_CTX *ctx;
int ret;
z_stream *zin;
if (!out || !outl)
return 0;
ctx = (BIO_ZLIB_CTX *)b->ptr;
zin = &ctx->zin;
BIO_clear_retry_flags(b);
if (!ctx->ibuf) {
ctx->ibuf = malloc(ctx->ibufsize);
if (!ctx->ibuf) {
COMPerror(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)) {
COMPerror(COMP_R_ZLIB_INFLATE_ERROR);
ERR_asprintf_error_data("zlib error:%s",
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(b->next_bio, 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;
if (!in || !inl)
return 0;
ctx = (BIO_ZLIB_CTX *)b->ptr;
if (ctx->odone)
return 0;
zout = &ctx->zout;
BIO_clear_retry_flags(b);
if (!ctx->obuf) {
ctx->obuf = malloc(ctx->obufsize);
/* Need error here */
if (!ctx->obuf) {
COMPerror(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(b->next_bio, 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) {
COMPerror(COMP_R_ZLIB_DEFLATE_ERROR);
ERR_asprintf_error_data("zlib error:%s", 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;
ctx = (BIO_ZLIB_CTX *)b->ptr;
/* 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(b->next_bio, 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) {
COMPerror(COMP_R_ZLIB_DEFLATE_ERROR);
ERR_asprintf_error_data("zlib error:%s", 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;
if (!b->next_bio)
return 0;
ctx = (BIO_ZLIB_CTX *)b->ptr;
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(b->next_bio);
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) {
free(ctx->ibuf);
ctx->ibuf = NULL;
ctx->ibufsize = ibs;
}
if (obs != -1) {
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(b->next_bio, cmd, num, ptr);
BIO_copy_next_retry(b);
break;
default:
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
}
return ret;
}
static long
bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
{
if (!b->next_bio)
return 0;
return BIO_callback_ctrl(b->next_bio, cmd, fp);
}
#endif