451 lines
11 KiB
C
451 lines
11 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/objects.h>
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#include <openssl/comp.h>
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COMP_METHOD *COMP_zlib(void );
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static COMP_METHOD zlib_method_nozlib={
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NID_undef,
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"(undef)",
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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};
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#ifndef ZLIB
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#undef ZLIB_SHARED
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#else
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#include <zlib.h>
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static int zlib_stateful_init(COMP_CTX *ctx);
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static void zlib_stateful_finish(COMP_CTX *ctx);
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static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen);
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static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen);
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static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen);
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static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen);
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static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
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uLong sourceLen);
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static COMP_METHOD zlib_stateless_method={
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NID_zlib_compression,
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LN_zlib_compression,
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NULL,
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NULL,
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zlib_compress_block,
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zlib_expand_block,
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NULL,
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NULL,
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};
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static COMP_METHOD zlib_stateful_method={
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NID_zlib_compression,
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LN_zlib_compression,
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zlib_stateful_init,
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zlib_stateful_finish,
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zlib_stateful_compress_block,
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zlib_stateful_expand_block,
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NULL,
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NULL,
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};
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/*
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* When OpenSSL is built on Windows, we do not want to require that
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* the ZLIB.DLL be available in order for the OpenSSL DLLs to
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* work. Therefore, all ZLIB routines are loaded at run time
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* and we do not link to a .LIB file.
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*/
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#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
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# include <windows.h>
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# define Z_CALLCONV _stdcall
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# define ZLIB_SHARED
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#else
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# define Z_CALLCONV
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#endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */
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#ifdef ZLIB_SHARED
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#include <openssl/dso.h>
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/* Prototypes for built in stubs */
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static int stub_compress(Bytef *dest,uLongf *destLen,
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const Bytef *source, uLong sourceLen);
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static int stub_inflateEnd(z_streamp strm);
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static int stub_inflate(z_streamp strm, int flush);
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static int stub_inflateInit_(z_streamp strm, const char * version,
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int stream_size);
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/* Function pointers */
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typedef int (Z_CALLCONV *compress_ft)(Bytef *dest,uLongf *destLen,
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const Bytef *source, uLong sourceLen);
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typedef int (Z_CALLCONV *inflateEnd_ft)(z_streamp strm);
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typedef int (Z_CALLCONV *inflate_ft)(z_streamp strm, int flush);
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typedef int (Z_CALLCONV *inflateInit__ft)(z_streamp strm,
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const char * version, int stream_size);
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typedef int (Z_CALLCONV *deflateEnd_ft)(z_streamp strm);
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typedef int (Z_CALLCONV *deflate_ft)(z_streamp strm, int flush);
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typedef int (Z_CALLCONV *deflateInit__ft)(z_streamp strm, int level,
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const char * version, int stream_size);
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static compress_ft p_compress=NULL;
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static inflateEnd_ft p_inflateEnd=NULL;
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static inflate_ft p_inflate=NULL;
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static inflateInit__ft p_inflateInit_=NULL;
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static deflateEnd_ft p_deflateEnd=NULL;
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static deflate_ft p_deflate=NULL;
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static deflateInit__ft p_deflateInit_=NULL;
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static int zlib_loaded = 0; /* only attempt to init func pts once */
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static DSO *zlib_dso = NULL;
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#define compress stub_compress
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#define inflateEnd stub_inflateEnd
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#define inflate stub_inflate
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#define inflateInit stub_inflateInit
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#define inflateInit_ stub_inflateInit_
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#define deflateEnd stub_deflateEnd
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#define deflate stub_deflate
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#define deflateInit stub_deflateInit
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#define deflateInit_ stub_deflateInit_
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#endif /* ZLIB_SHARED */
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struct zlib_state
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{
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z_stream istream;
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z_stream ostream;
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};
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static int zlib_stateful_ex_idx = -1;
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static void zlib_stateful_free_ex_data(void *obj, void *item,
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CRYPTO_EX_DATA *ad, int ind,long argl, void *argp)
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{
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struct zlib_state *state = (struct zlib_state *)item;
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inflateEnd(&state->istream);
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deflateEnd(&state->ostream);
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OPENSSL_free(state);
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}
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static int zlib_stateful_init(COMP_CTX *ctx)
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{
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int err;
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struct zlib_state *state =
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(struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
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if (state == NULL)
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goto err;
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state->istream.zalloc = Z_NULL;
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state->istream.zfree = Z_NULL;
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state->istream.opaque = Z_NULL;
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state->istream.next_in = Z_NULL;
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state->istream.next_out = Z_NULL;
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state->istream.avail_in = 0;
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state->istream.avail_out = 0;
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err = inflateInit(&state->istream);
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if (err != Z_OK)
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goto err;
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state->ostream.zalloc = Z_NULL;
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state->ostream.zfree = Z_NULL;
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state->ostream.opaque = Z_NULL;
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state->ostream.next_in = Z_NULL;
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state->ostream.next_out = Z_NULL;
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state->ostream.avail_in = 0;
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state->ostream.avail_out = 0;
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err = deflateInit(&state->ostream,Z_DEFAULT_COMPRESSION);
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if (err != Z_OK)
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goto err;
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CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
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if (zlib_stateful_ex_idx == -1)
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{
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zlib_stateful_ex_idx =
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CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
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0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
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if (zlib_stateful_ex_idx == -1)
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goto err;
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}
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CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
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return 1;
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err:
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if (state) OPENSSL_free(state);
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return 0;
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}
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static void zlib_stateful_finish(COMP_CTX *ctx)
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{
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CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
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}
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static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen)
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{
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int err = Z_OK;
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struct zlib_state *state =
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(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
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zlib_stateful_ex_idx);
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if (state == NULL)
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return -1;
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state->ostream.next_in = in;
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state->ostream.avail_in = ilen;
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state->ostream.next_out = out;
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state->ostream.avail_out = olen;
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if (ilen > 0)
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err = deflate(&state->ostream, Z_SYNC_FLUSH);
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if (err != Z_OK)
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return -1;
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#ifdef DEBUG_ZLIB
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fprintf(stderr,"compress(%4d)->%4d %s\n",
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ilen,olen - state->ostream.avail_out,
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(ilen != olen - state->ostream.avail_out)?"zlib":"clear");
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#endif
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return olen - state->ostream.avail_out;
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}
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static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen)
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{
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int err = Z_OK;
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struct zlib_state *state =
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(struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
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zlib_stateful_ex_idx);
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if (state == NULL)
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return 0;
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state->istream.next_in = in;
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state->istream.avail_in = ilen;
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state->istream.next_out = out;
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state->istream.avail_out = olen;
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if (ilen > 0)
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err = inflate(&state->istream, Z_SYNC_FLUSH);
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if (err != Z_OK)
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return -1;
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#ifdef DEBUG_ZLIB
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fprintf(stderr,"expand(%4d)->%4d %s\n",
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ilen,olen - state->istream.avail_out,
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(ilen != olen - state->istream.avail_out)?"zlib":"clear");
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#endif
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return olen - state->istream.avail_out;
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}
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static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen)
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{
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unsigned long l;
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int i;
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int clear=1;
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if (ilen > 128)
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{
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out[0]=1;
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l=olen-1;
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i=compress(&(out[1]),&l,in,(unsigned long)ilen);
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if (i != Z_OK)
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return(-1);
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if (ilen > l)
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{
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clear=0;
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l++;
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}
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}
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if (clear)
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{
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out[0]=0;
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memcpy(&(out[1]),in,ilen);
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l=ilen+1;
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}
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#ifdef DEBUG_ZLIB
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fprintf(stderr,"compress(%4d)->%4d %s\n",
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ilen,(int)l,(clear)?"clear":"zlib");
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#endif
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return((int)l);
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}
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static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
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unsigned int olen, unsigned char *in, unsigned int ilen)
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{
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unsigned long l;
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int i;
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if (in[0])
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{
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l=olen;
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i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
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if (i != Z_OK)
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return(-1);
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}
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else
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{
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memcpy(out,&(in[1]),ilen-1);
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l=ilen-1;
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}
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#ifdef DEBUG_ZLIB
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fprintf(stderr,"expand (%4d)->%4d %s\n",
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ilen,(int)l,in[0]?"zlib":"clear");
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#endif
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return((int)l);
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}
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static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
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uLong sourceLen)
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{
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z_stream stream;
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int err;
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stream.next_in = (Bytef*)source;
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stream.avail_in = (uInt)sourceLen;
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/* Check for source > 64K on 16-bit machine: */
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if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
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stream.next_out = dest;
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stream.avail_out = (uInt)*destLen;
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if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
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stream.zalloc = (alloc_func)0;
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stream.zfree = (free_func)0;
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err = inflateInit(&stream);
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if (err != Z_OK) return err;
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err = inflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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inflateEnd(&stream);
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return err;
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}
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*destLen = stream.total_out;
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err = inflateEnd(&stream);
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return err;
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}
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#endif
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COMP_METHOD *COMP_zlib(void)
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{
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COMP_METHOD *meth = &zlib_method_nozlib;
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#ifdef ZLIB_SHARED
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if (!zlib_loaded)
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{
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#if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
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zlib_dso = DSO_load(NULL, "ZLIB", NULL, 0);
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#else
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zlib_dso = DSO_load(NULL, "z", NULL, 0);
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#endif
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if (zlib_dso != NULL)
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{
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p_compress
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= (compress_ft) DSO_bind_func(zlib_dso,
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"compress");
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p_inflateEnd
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= (inflateEnd_ft) DSO_bind_func(zlib_dso,
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"inflateEnd");
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p_inflate
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= (inflate_ft) DSO_bind_func(zlib_dso,
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"inflate");
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p_inflateInit_
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= (inflateInit__ft) DSO_bind_func(zlib_dso,
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"inflateInit_");
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p_deflateEnd
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= (deflateEnd_ft) DSO_bind_func(zlib_dso,
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"deflateEnd");
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p_deflate
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= (deflate_ft) DSO_bind_func(zlib_dso,
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"deflate");
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p_deflateInit_
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= (deflateInit__ft) DSO_bind_func(zlib_dso,
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"deflateInit_");
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zlib_loaded++;
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}
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}
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#endif
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#if defined(ZLIB) || defined(ZLIB_SHARED)
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meth = &zlib_stateful_method;
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#endif
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return(meth);
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}
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#ifdef ZLIB_SHARED
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/* Stubs for each function to be dynamicly loaded */
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static int
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stub_compress(Bytef *dest,uLongf *destLen,const Bytef *source, uLong sourceLen)
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{
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if (p_compress)
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return(p_compress(dest,destLen,source,sourceLen));
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else
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return(Z_MEM_ERROR);
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}
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static int
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stub_inflateEnd(z_streamp strm)
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{
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if ( p_inflateEnd )
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return(p_inflateEnd(strm));
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else
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return(Z_MEM_ERROR);
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}
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static int
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stub_inflate(z_streamp strm, int flush)
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{
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if ( p_inflate )
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return(p_inflate(strm,flush));
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else
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return(Z_MEM_ERROR);
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}
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static int
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stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
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{
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if ( p_inflateInit_ )
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return(p_inflateInit_(strm,version,stream_size));
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else
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return(Z_MEM_ERROR);
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}
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static int
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stub_deflateEnd(z_streamp strm)
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{
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if ( p_deflateEnd )
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return(p_deflateEnd(strm));
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else
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return(Z_MEM_ERROR);
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}
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static int
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stub_deflate(z_streamp strm, int flush)
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{
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if ( p_deflate )
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return(p_deflate(strm,flush));
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else
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return(Z_MEM_ERROR);
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}
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static int
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stub_deflateInit_(z_streamp strm, int level,
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const char * version, int stream_size)
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{
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if ( p_deflateInit_ )
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return(p_deflateInit_(strm,version,stream_size));
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else
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return(Z_MEM_ERROR);
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}
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#endif /* ZLIB_SHARED */
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