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Implement a stateful variant if the ZLIB compression method. The old
[openssl.git] / crypto / comp / c_zlib.c
diff --git a/crypto/comp/c_zlib.c b/crypto/comp/c_zlib.c
index 8c0876151ac7feff30760102dc0a19ef3dab7582..d31ab63ad2fe6248ce3ca40d067f0dc0af6205b2 100644 (file)
--- a/crypto/comp/c_zlib.c
+++ b/crypto/comp/c_zlib.c
@@ -23,6 +23,13 @@ static COMP_METHOD zlib_method_nozlib={
 
 #include <zlib.h>
 
 
 #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);
+
 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,
 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,
@@ -31,7 +38,7 @@ static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
 static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
        uLong sourceLen);
 
 static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
        uLong sourceLen);
 
-static COMP_METHOD zlib_method={
+static COMP_METHOD zlib_stateless_method={
        NID_zlib_compression,
        LN_zlib_compression,
        NULL,
        NID_zlib_compression,
        LN_zlib_compression,
        NULL,
@@ -42,6 +49,17 @@ static COMP_METHOD zlib_method={
        NULL,
        };
 
        NULL,
        };
 
+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,
+       NULL,
+       NULL,
+       };
+
 /* 
  * 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
 /* 
  * 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
@@ -75,10 +93,17 @@ typedef int (Z_CALLCONV *inflateEnd_ft)(z_streamp strm);
 typedef int (Z_CALLCONV *inflate_ft)(z_streamp strm, int flush);
 typedef int (Z_CALLCONV *inflateInit__ft)(z_streamp strm,
        const char * version, int stream_size);
 typedef int (Z_CALLCONV *inflate_ft)(z_streamp strm, int flush);
 typedef int (Z_CALLCONV *inflateInit__ft)(z_streamp strm,
        const char * version, int stream_size);
+typedef int (Z_CALLCONV *deflateEnd_ft)(z_streamp strm);
+typedef int (Z_CALLCONV *deflate_ft)(z_streamp strm, int flush);
+typedef int (Z_CALLCONV *deflateInit__ft)(z_streamp strm, int level,
+       const char * version, int stream_size);
 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 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 int zlib_loaded = 0;     /* only attempt to init func pts once */
 static DSO *zlib_dso = NULL;
 
 static int zlib_loaded = 0;     /* only attempt to init func pts once */
 static DSO *zlib_dso = NULL;
@@ -86,11 +111,130 @@ static DSO *zlib_dso = NULL;
 #define compress                stub_compress
 #define inflateEnd              stub_inflateEnd
 #define inflate                 stub_inflate
 #define compress                stub_compress
 #define inflateEnd              stub_inflateEnd
 #define inflate                 stub_inflate
+#define inflateInit             stub_inflateInit
 #define inflateInit_            stub_inflateInit_
 #define inflateInit_            stub_inflateInit_
+#define deflateEnd              stub_deflateEnd
+#define deflate                 stub_deflate
+#define deflateInit             stub_deflateInit
+#define deflateInit_            stub_deflateInit_
 #endif /* ZLIB_SHARED */
 
 #endif /* ZLIB_SHARED */
 
+struct zlib_state
+       {
+       z_stream istream;
+       z_stream ostream;
+       };
+
+static int zlib_stateful_ex_idx = -1;
+
+static void zlib_stateful_free_ex_data(void *obj, void *item,
+       CRYPTO_EX_DATA *ad, int ind,long argl, void *argp)
+       {
+       struct zlib_state *state = (struct zlib_state *)item;
+       inflateEnd(&state->istream);
+       deflateEnd(&state->ostream);
+       OPENSSL_free(state);
+       }
+
+static int zlib_stateful_init(COMP_CTX *ctx)
+       {
+       int err;
+       struct zlib_state *state =
+               (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
+
+       if (state == NULL)
+               goto err;
+
+       state->istream.zalloc = Z_NULL;
+       state->istream.zfree = Z_NULL;
+       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);
+       if (err != Z_OK)
+               goto err;
+
+       state->ostream.zalloc = Z_NULL;
+       state->ostream.zfree = Z_NULL;
+       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);
+       if (err != Z_OK)
+               goto err;
+
+       CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
+       if (zlib_stateful_ex_idx == -1)
+               {
+               zlib_stateful_ex_idx =
+                       CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
+                               0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
+               if (zlib_stateful_ex_idx == -1)
+                       goto err;
+               }
+       CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
+       return 1;
+ err:
+       if (state) OPENSSL_free(state);
+       return 0;
+       }
+
+static void zlib_stateful_finish(COMP_CTX *ctx)
+       {
+       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;
+       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;
+       return olen - state->istream.avail_out;
+       }
+
 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
-            unsigned int olen, unsigned char *in, unsigned int ilen)
+       unsigned int olen, unsigned char *in, unsigned int ilen)
        {
        unsigned long l;
        int i;
        {
        unsigned long l;
        int i;
@@ -123,7 +267,7 @@ static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
        }
 
 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
        }
 
 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
-            unsigned int olen, unsigned char *in, unsigned int ilen)
+       unsigned int olen, unsigned char *in, unsigned int ilen)
        {
        unsigned long l;
        int i;
        {
        unsigned long l;
        int i;
@@ -207,13 +351,22 @@ COMP_METHOD *COMP_zlib(void)
                        p_inflateInit_
                                = (inflateInit__ft) DSO_bind_func(zlib_dso,
                                        "inflateInit_");
                        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_");
                        zlib_loaded++;
                        }
                }
 
 #endif
 #if defined(ZLIB) || defined(ZLIB_SHARED)
                        zlib_loaded++;
                        }
                }
 
 #endif
 #if defined(ZLIB) || defined(ZLIB_SHARED)
-       meth = &zlib_method;
+       meth = &zlib_stateful_method;
 #endif
 
        return(meth);
 #endif
 
        return(meth);
@@ -257,4 +410,32 @@ stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
                return(Z_MEM_ERROR);
        }
 
                return(Z_MEM_ERROR);
        }
 
+static int
+stub_deflateEnd(z_streamp strm)
+       {
+       if ( p_deflateEnd )
+               return(p_deflateEnd(strm));
+       else
+               return(Z_MEM_ERROR);
+       }
+
+static int
+stub_deflate(z_streamp strm, int flush)
+       {
+       if ( p_deflate )
+               return(p_deflate(strm,flush));
+       else
+               return(Z_MEM_ERROR);
+       }
+
+static int
+stub_deflateInit_(z_streamp strm, int level,
+       const char * version, int stream_size)
+       {
+       if ( p_deflateInit_ )
+               return(p_deflateInit_(strm,version,stream_size));
+       else
+               return(Z_MEM_ERROR);
+       }
+
 #endif /* ZLIB_SHARED */
 #endif /* ZLIB_SHARED */
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