diff options
Diffstat (limited to 'erts/emulator/drivers')
| -rw-r--r-- | erts/emulator/drivers/common/zlib_drv.c | 58 |
1 files changed, 43 insertions, 15 deletions
diff --git a/erts/emulator/drivers/common/zlib_drv.c b/erts/emulator/drivers/common/zlib_drv.c index 440ba956d8..066cf87c9d 100644 --- a/erts/emulator/drivers/common/zlib_drv.c +++ b/erts/emulator/drivers/common/zlib_drv.c @@ -44,30 +44,34 @@ #define INFLATE_INIT 8 #define INFLATE_INIT2 9 #define INFLATE_SETDICT 10 -#define INFLATE_SYNC 11 -#define INFLATE_RESET 12 -#define INFLATE_END 13 -#define INFLATE 14 +#define INFLATE_GETDICT 11 +#define INFLATE_SYNC 12 +#define INFLATE_RESET 13 +#define INFLATE_END 14 +#define INFLATE 15 -#define CRC32_0 15 -#define CRC32_1 16 -#define CRC32_2 17 +#define CRC32_0 16 +#define CRC32_1 17 +#define CRC32_2 18 -#define SET_BUFSZ 18 -#define GET_BUFSZ 19 -#define GET_QSIZE 20 +#define SET_BUFSZ 19 +#define GET_BUFSZ 20 +#define GET_QSIZE 21 -#define ADLER32_1 21 -#define ADLER32_2 22 +#define ADLER32_1 22 +#define ADLER32_2 23 -#define CRC32_COMBINE 23 -#define ADLER32_COMBINE 24 +#define CRC32_COMBINE 24 +#define ADLER32_COMBINE 25 -#define INFLATE_CHUNK 25 +#define INFLATE_CHUNK 26 #define DEFAULT_BUFSZ 4000 +/* According to zlib documentation, it can never exceed this */ +#define INFL_DICT_SZ 32768 + /* This flag is used in the same places, where zlib return codes * (Z_OK, Z_STREAM_END, Z_NEED_DICT) are. So, we need to set it to * relatively large value to avoid possible value clashes in future. @@ -248,6 +252,20 @@ static int zlib_output(ZLibData* d) return zlib_output_init(d); } +#ifdef HAVE_ZLIB_INFLATEGETDICTIONARY +static int zlib_inflate_get_dictionary(ZLibData* d) +{ + ErlDrvBinary* dbin = driver_alloc_binary(INFL_DICT_SZ); + uInt dlen = 0; + int res = inflateGetDictionary(&d->s, (unsigned char*)dbin->orig_bytes, &dlen); + if ((res == Z_OK) && (driver_output_binary(d->port, NULL, 0, dbin, 0, dlen) < 0)) { + res = Z_ERRNO; + } + driver_free_binary(dbin); + return res; +} +#endif + static int zlib_inflate(ZLibData* d, int flush) { int res = Z_OK; @@ -586,6 +604,16 @@ static ErlDrvSSizeT zlib_ctl(ErlDrvData drv_data, unsigned int command, char *bu res = inflateSetDictionary(&d->s, (unsigned char*)buf, len); return zlib_return(res, rbuf, rlen); + case INFLATE_GETDICT: +#ifdef HAVE_ZLIB_INFLATEGETDICTIONARY + if (d->state != ST_INFLATE) goto badarg; + res = zlib_inflate_get_dictionary(d); + return zlib_return(res, rbuf, rlen); +#else + errno = ENOTSUP; + return zlib_return(Z_ERRNO, rbuf, rlen); +#endif + case INFLATE_SYNC: if (d->state != ST_INFLATE) goto badarg; if (len != 0) goto badarg; |