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-rw-r--r--erts/emulator/nifs/common/zlib_nif.c127
-rw-r--r--erts/preloaded/ebin/zlib.beambin19120 -> 19492 bytes
-rw-r--r--erts/preloaded/src/zlib.erl36
-rw-r--r--lib/kernel/test/zlib_SUITE.erl23
4 files changed, 94 insertions, 92 deletions
diff --git a/erts/emulator/nifs/common/zlib_nif.c b/erts/emulator/nifs/common/zlib_nif.c
index a1a65e1946..a9c5b05e47 100644
--- a/erts/emulator/nifs/common/zlib_nif.c
+++ b/erts/emulator/nifs/common/zlib_nif.c
@@ -69,11 +69,27 @@ typedef enum {
ST_DEFLATE = 1,
ST_INFLATE = 2,
ST_CLOSED = 3
-} zlib_state;
+} zlib_state_t;
+
+/* Controls what to do when the user attempts to decompress more data after
+ * Z_STREAM_END has been returned:
+ *
+ * - 'cut' wipes all further input and returns empty results until reset by
+ * the user. This is the default behavior, matching that of the old driver.
+ * - 'reset' resets the state without discarding any input, making it possible
+ * to decompress blindly concatenated streams.
+ * - 'error' crashes with a data error. */
+typedef enum {
+ EOS_BEHAVIOR_ERROR = 0,
+ EOS_BEHAVIOR_RESET = 1,
+ EOS_BEHAVIOR_CUT = 2
+} zlib_eos_behavior_t;
typedef struct {
z_stream s;
- zlib_state state;
+ zlib_state_t state;
+
+ zlib_eos_behavior_t eos_behavior;
/* These refer to the plaintext CRC, and are only needed for zlib:crc32/1
* which is deprecated. */
@@ -102,7 +118,6 @@ typedef struct {
static ERL_NIF_TERM zlib_open(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_close(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_deflateInit(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
-static ERL_NIF_TERM zlib_deflateInit2(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_deflateSetDictionary(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_deflateReset(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_deflateEnd(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
@@ -110,7 +125,6 @@ static ERL_NIF_TERM zlib_deflateParams(ErlNifEnv *env, int argc, const ERL_NIF_T
static ERL_NIF_TERM zlib_deflate(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_inflateInit(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
-static ERL_NIF_TERM zlib_inflateInit2(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_inflateSetDictionary(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_inflateGetDictionary(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM zlib_inflateReset(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
@@ -130,8 +144,7 @@ static ERL_NIF_TERM zlib_enqueue_input(ErlNifEnv *env, int argc, const ERL_NIF_T
static ErlNifFunc nif_funcs[] = {
/* deflate */
- {"deflateInit_nif", 2, zlib_deflateInit},
- {"deflateInit_nif", 6, zlib_deflateInit2},
+ {"deflateInit_nif", 6, zlib_deflateInit},
{"deflateSetDictionary_nif", 2, zlib_deflateSetDictionary},
{"deflateReset_nif", 1, zlib_deflateReset},
{"deflateEnd_nif", 1, zlib_deflateEnd},
@@ -139,8 +152,7 @@ static ErlNifFunc nif_funcs[] = {
{"deflate_nif", 4, zlib_deflate},
/* inflate */
- {"inflateInit_nif", 1, zlib_inflateInit},
- {"inflateInit_nif", 2, zlib_inflateInit2},
+ {"inflateInit_nif", 3, zlib_inflateInit},
{"inflateSetDictionary_nif", 2, zlib_inflateSetDictionary},
{"inflateGetDictionary_nif", 1, zlib_inflateGetDictionary},
{"inflateReset_nif", 1, zlib_inflateReset},
@@ -509,9 +521,11 @@ static ERL_NIF_TERM zlib_open(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[
d->s.opaque = d;
d->s.data_type = Z_BINARY;
- d->state = ST_NONE;
+ d->eos_behavior = EOS_BEHAVIOR_CUT;
d->eos_seen = 0;
+ d->state = ST_NONE;
+
d->want_output_crc = 0;
d->want_input_crc = 0;
d->is_raw_stream = 0;
@@ -551,42 +565,6 @@ static ERL_NIF_TERM zlib_close(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv
static ERL_NIF_TERM zlib_deflateInit(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
zlib_data_t *d;
- int level, res;
-
- if(argc != 2 || !get_zlib_data(env, argv[0], &d) ||
- !enif_get_int(env, argv[1], &level)) {
- return enif_make_badarg(env);
- } else if(!zlib_process_check(env, d)) {
- return enif_raise_exception(env, am_not_on_controlling_process);
- } else if(d->state != ST_NONE) {
- return enif_raise_exception(env, am_already_initialized);
- }
-
- res = deflateInit(&d->s, level);
-
- if(res == Z_OK) {
- d->state = ST_DEFLATE;
- d->eos_seen = 0;
-
- /* FIXME: crc32/1 is documented as returning "the current calculated
- * checksum," but failed to mention that the old implementation only
- * calculated it when WindowBits < 0 (See zlib_deflateInit2).
- *
- * We could fix this behavior by setting d->want_input_crc to 1 here,
- * but we've decided to retain this quirk since the performance hit is
- * quite significant. */
- d->want_output_crc = 0;
- d->want_input_crc = 0;
-
- d->output_crc = crc32(0L, Z_NULL, 0);
- d->input_crc = crc32(0L, Z_NULL, 0);
- }
-
- return zlib_return(env, res);
-}
-
-static ERL_NIF_TERM zlib_deflateInit2(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
- zlib_data_t *d;
int level, method, windowBits, memLevel, strategy, res;
if(argc != 6 || !get_zlib_data(env, argv[0], &d)
@@ -741,39 +719,12 @@ static ERL_NIF_TERM zlib_deflate(ErlNifEnv *env, int argc, const ERL_NIF_TERM ar
static ERL_NIF_TERM zlib_inflateInit(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
zlib_data_t *d;
- int res;
- if(argc != 1 || !get_zlib_data(env, argv[0], &d)) {
- return enif_make_badarg(env);
- } else if(!zlib_process_check(env, d)) {
- return enif_raise_exception(env, am_not_on_controlling_process);
- } else if(d->state != ST_NONE) {
- return enif_raise_exception(env, am_already_initialized);
- }
-
- res = inflateInit(&d->s);
-
- if(res == Z_OK) {
- d->state = ST_INFLATE;
- d->eos_seen = 0;
-
- d->want_output_crc = 0;
- d->want_input_crc = 0;
- d->is_raw_stream = 0;
-
- d->output_crc = crc32(0L, Z_NULL, 0);
- d->input_crc = crc32(0L, Z_NULL, 0);
- }
-
- return zlib_return(env, res);
-}
+ int windowBits, eosBehavior, res;
-static ERL_NIF_TERM zlib_inflateInit2(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
- zlib_data_t *d;
- int windowBits, res;
-
- if(argc != 2 || !get_zlib_data(env, argv[0], &d)
- || !enif_get_int(env, argv[1], &windowBits)) {
+ if(argc != 3 || !get_zlib_data(env, argv[0], &d)
+ || !enif_get_int(env, argv[1], &windowBits)
+ || !enif_get_int(env, argv[2], &eosBehavior)) {
return enif_make_badarg(env);
} else if(!zlib_process_check(env, d)) {
return enif_raise_exception(env, am_not_on_controlling_process);
@@ -785,6 +736,8 @@ static ERL_NIF_TERM zlib_inflateInit2(ErlNifEnv *env, int argc, const ERL_NIF_TE
if(res == Z_OK) {
d->state = ST_INFLATE;
+
+ d->eos_behavior = eosBehavior;
d->eos_seen = 0;
d->is_raw_stream = (windowBits < 0);
@@ -934,6 +887,28 @@ static ERL_NIF_TERM zlib_inflate(ErlNifEnv *env, int argc, const ERL_NIF_TERM ar
return enif_raise_exception(env, am_not_initialized);
}
+ if(d->eos_seen) {
+ int res;
+
+ switch(d->eos_behavior) {
+ case EOS_BEHAVIOR_ERROR:
+ return zlib_return(env, Z_DATA_ERROR);
+ case EOS_BEHAVIOR_RESET:
+ res = inflateReset(&d->s);
+
+ if(res != Z_OK) {
+ return zlib_return(env, res);
+ }
+
+ d->eos_seen = 0;
+ break;
+ case EOS_BEHAVIOR_CUT:
+ zlib_reset_input(d);
+
+ return enif_make_tuple2(env, am_finished, enif_make_list(env, 0));
+ }
+ }
+
return zlib_codec(&inflate, env, d, input_chunk_size, output_chunk_size, flush);
}
diff --git a/erts/preloaded/ebin/zlib.beam b/erts/preloaded/ebin/zlib.beam
index 267b5cb0a8..5048bdb846 100644
--- a/erts/preloaded/ebin/zlib.beam
+++ b/erts/preloaded/ebin/zlib.beam
Binary files differ
diff --git a/erts/preloaded/src/zlib.erl b/erts/preloaded/src/zlib.erl
index dca5a42779..611010550f 100644
--- a/erts/preloaded/src/zlib.erl
+++ b/erts/preloaded/src/zlib.erl
@@ -23,7 +23,7 @@
-export([open/0,close/1,deflateInit/1,deflateInit/2,deflateInit/6,
deflateSetDictionary/2,deflateReset/1,deflateParams/3,
deflate/2,deflate/3,deflateEnd/1,
- inflateInit/1,inflateInit/2,
+ inflateInit/1,inflateInit/2,inflateInit/3,
inflateSetDictionary/2,inflateGetDictionary/1, inflateReset/1,
inflate/2,inflate/3,inflateEnd/1,
inflateChunk/2,inflateChunk/1,
@@ -68,6 +68,13 @@
-define(MAX_WBITS, 15).
+-define(DEFAULT_MEMLEVEL, 8).
+-define(DEFAULT_WBITS, 15).
+
+-define(EOS_BEHAVIOR_ERROR, 0).
+-define(EOS_BEHAVIOR_RESET, 1).
+-define(EOS_BEHAVIOR_CUT, 2).
+
%% Chunk sizes are hardcoded on account of them screwing with the
%% predictability of the system. zlib is incapable of trapping so we need to
%% ensure that it never operates on any significant amount of data.
@@ -130,10 +137,7 @@ deflateInit(Z) ->
Z :: zstream(),
Level :: zlevel().
deflateInit(Z, Level) ->
- deflateInit_nif(Z, arg_level(Level)).
-
-deflateInit_nif(_Z, _Level) ->
- erlang:nif_error(undef).
+ deflateInit(Z, Level, deflated, ?DEFAULT_WBITS, ?DEFAULT_MEMLEVEL, default).
-spec deflateInit(Z, Level, Method, WindowBits, MemLevel, Strategy) -> 'ok' when
Z :: zstream(),
@@ -225,16 +229,21 @@ deflateEnd_nif(_Z) ->
-spec inflateInit(Z) -> 'ok' when
Z :: zstream().
inflateInit(Z) ->
- inflateInit_nif(Z).
-inflateInit_nif(_Z) ->
- erlang:nif_error(undef).
+ inflateInit(Z, ?DEFAULT_WBITS).
-spec inflateInit(Z, WindowBits) -> 'ok' when
Z :: zstream(),
WindowBits :: zwindowbits().
inflateInit(Z, WindowBits) ->
- inflateInit_nif(Z, WindowBits).
-inflateInit_nif(_Z, _WindowBits) ->
+ inflateInit(Z, WindowBits, cut).
+
+-spec inflateInit(Z, WindowBits, EoSBehavior) -> 'ok' when
+ Z :: zstream(),
+ WindowBits :: zwindowbits(),
+ EoSBehavior :: error | reset | cut.
+inflateInit(Z, WindowBits, EoSBehavior) ->
+ inflateInit_nif(Z, arg_bitsz(WindowBits), arg_eos_behavior(EoSBehavior)).
+inflateInit_nif(_Z, _WindowBits, _EoSBehavior) ->
erlang:nif_error(undef).
-spec inflateSetDictionary(Z, Dictionary) -> 'ok' when
@@ -532,7 +541,7 @@ gzip(Data) ->
gunzip(Data) ->
Z = open(),
Bs = try
- inflateInit(Z, 16+?MAX_WBITS),
+ inflateInit(Z, 16+?MAX_WBITS, reset),
B = inflate(Z, Data),
inflateEnd(Z),
B
@@ -652,6 +661,11 @@ arg_strategy(_) -> erlang:error(bad_compression_strategy).
arg_method(deflated) -> ?Z_DEFLATED;
arg_method(_) -> erlang:error(bad_compression_method).
+arg_eos_behavior(error) -> ?EOS_BEHAVIOR_ERROR;
+arg_eos_behavior(reset) -> ?EOS_BEHAVIOR_RESET;
+arg_eos_behavior(cut) -> ?EOS_BEHAVIOR_CUT;
+arg_eos_behavior(_) -> erlang:error(bad_eos_behavior).
+
-spec arg_bitsz(zwindowbits()) -> zwindowbits().
arg_bitsz(Bits) when is_integer(Bits) andalso
((8 =< Bits andalso Bits < 48) orelse
diff --git a/lib/kernel/test/zlib_SUITE.erl b/lib/kernel/test/zlib_SUITE.erl
index e246276262..d17eded811 100644
--- a/lib/kernel/test/zlib_SUITE.erl
+++ b/lib/kernel/test/zlib_SUITE.erl
@@ -276,10 +276,10 @@ api_inflateInit(Config) when is_list(Config) ->
?m(ok,zlib:close(Z12))
end, lists:seq(8,15)),
?m(?EXIT(badarg), zlib:inflateInit(gurka, -15)),
- ?m(?EXIT(already_initialized), zlib:inflateInit(Z1, 7)),
- ?m(?EXIT(already_initialized), zlib:inflateInit(Z1, -7)),
- ?m(?EXIT(already_initialized), zlib:inflateInit(Z1, 48)),
- ?m(?EXIT(already_initialized), zlib:inflateInit(Z1, -16)),
+ ?m(?EXIT(bad_windowbits), zlib:inflateInit(Z1, 7)),
+ ?m(?EXIT(bad_windowbits), zlib:inflateInit(Z1, -7)),
+ ?m(?EXIT(bad_windowbits), zlib:inflateInit(Z1, 48)),
+ ?m(?EXIT(bad_windowbits), zlib:inflateInit(Z1, -16)),
?m(ok, zlib:close(Z1)).
%% Test inflateSetDictionary.
@@ -416,6 +416,9 @@ api_inflateChunk(Config) when is_list(Config) ->
{more, Part1AsIOList} = zlib:inflateChunk(Z1, Compressed),
{more, Part2AsIOList} = zlib:inflateChunk(Z1),
{more, Part3AsIOList} = zlib:inflateChunk(Z1),
+
+ [] = zlib:inflateChunk(Z1),
+ [] = zlib:inflateChunk(Z1),
[] = zlib:inflateChunk(Z1),
?m(Part1, iolist_to_binary(Part1AsIOList)),
@@ -483,7 +486,8 @@ api_safeInflate(Config) when is_list(Config) ->
SafeInflateLoop(zlib:safeInflate(Z1, Compressed), []),
- ?m(?EXIT(data_error), zlib:safeInflate(Z1, Compressed)),
+ ?m({finished, []}, zlib:safeInflate(Z1, Compressed)),
+ ?m({finished, []}, zlib:safeInflate(Z1, Compressed)),
?m(ok, zlib:inflateReset(Z1)),
?m(?EXIT(badarg), zlib:safeInflate(gurka, Compressed)),
@@ -632,6 +636,7 @@ api_g_un_zip(Config) when is_list(Config) ->
?m(?EXIT(badarg),zlib:gzip(not_a_binary)),
Bin = <<1,11,1,23,45>>,
Comp = zlib:gzip(Bin),
+
?m(Comp, zlib:gzip(binary_to_list(Bin))),
?m(?EXIT(badarg), zlib:gunzip(not_a_binary)),
?m(?EXIT(data_error), zlib:gunzip(<<171,171,171,171,171>>)),
@@ -639,6 +644,14 @@ api_g_un_zip(Config) when is_list(Config) ->
?m(Bin, zlib:gunzip(Comp)),
?m(Bin, zlib:gunzip(binary_to_list(Comp))),
+ %% RFC 1952:
+ %%
+ %% "A gzip file consists of a series of "members" (compressed data
+ %% sets). [...] The members simply appear one after another in the file,
+ %% with no additional information before, between, or after them."
+ Concatenated = <<Bin/binary, Bin/binary>>,
+ ?m(Concatenated, zlib:gunzip([Comp, Comp])),
+
%% Bad CRC; bad length.
BadCrc = bad_crc_data(),
?m(?EXIT(data_error),(catch zlib:gunzip(BadCrc))),
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 08:55:53 +0000