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Compression conditions adjustments #303

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Merged
sodabrew merged 2 commits into from
Jan 25, 2017
Merged

Compression conditions adjustments #303

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7283b11
test: compression edge case verification (#256)
dictcp Jun 10, 2016
c85f34c
Make sure that s_compress_value() will always leave a valid payload, …
sodabrew Jan 25, 2017
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Make sure that s_compress_value() will always leave a valid payload, … 
…even if it did not get compressed
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@sodabrew
sodabrew committed Jan 25, 2017
commit c85f34c01ba884987fa3ed4daf7846e503a89cdf
53 changes: 27 additions & 26 deletions php_memcached.c
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Original file line number Diff line number Diff line change
Expand Up @@ -830,6 +830,7 @@ zend_bool s_compress_value (php_memc_compression_type compression_type, zend_str
/* status */
zend_bool compress_status = 0;
zend_string *payload = *payload_in;
uint32_t compression_type_flag = 0;

/* Additional 5% for the data */
size_t buffer_size = (size_t) (((double) ZSTR_LEN(payload) * 1.05) + 1.0);
Expand All @@ -847,7 +848,7 @@ zend_bool s_compress_value (php_memc_compression_type compression_type, zend_str

if (compressed_size > 0) {
compress_status = 1;
MEMC_VAL_SET_FLAG(*flags, MEMC_VAL_COMPRESSION_FASTLZ);
compression_type_flag = MEMC_VAL_COMPRESSION_FASTLZ;
}
}
break;
Expand All @@ -859,7 +860,7 @@ zend_bool s_compress_value (php_memc_compression_type compression_type, zend_str

if (status == Z_OK) {
compress_status = 1;
MEMC_VAL_SET_FLAG(*flags, MEMC_VAL_COMPRESSION_ZLIB);
compression_type_flag = MEMC_VAL_COMPRESSION_ZLIB;
}
}
break;
Expand All @@ -869,31 +870,29 @@ zend_bool s_compress_value (php_memc_compression_type compression_type, zend_str
break;
}

if (!compress_status) {
php_error_docref(NULL, E_WARNING, "could not compress value");
efree (buffer);
return 0;
}

/* This means the value was too small to be compressed, still a success */
/* This means the value was too small to be compressed and ended up larger */
if (ZSTR_LEN(payload) <= (compressed_size * MEMC_G(compression_factor))) {
MEMC_VAL_DEL_FLAG(*flags, MEMC_VAL_COMPRESSION_FASTLZ | MEMC_VAL_COMPRESSION_ZLIB);
efree (buffer);
return 1;
compress_status = 0;
}

MEMC_VAL_SET_FLAG(*flags, MEMC_VAL_COMPRESSED);
/* Replace the payload with the compressed copy */
if (compress_status) {
MEMC_VAL_SET_FLAG(*flags, MEMC_VAL_COMPRESSED | compression_type_flag);
payload = zend_string_realloc(payload, compressed_size + sizeof(uint32_t), 0);

payload = zend_string_realloc(payload, compressed_size + sizeof(uint32_t), 0);
/* Copy the uin32_t at the beginning */
memcpy(ZSTR_VAL(payload), &original_size, sizeof(uint32_t));
memcpy(ZSTR_VAL(payload) + sizeof (uint32_t), buffer, compressed_size);
efree(buffer);

/* Copy the uin32_t at the beginning */
memcpy(ZSTR_VAL(payload), &original_size, sizeof(uint32_t));
memcpy(ZSTR_VAL(payload) + sizeof (uint32_t), buffer, compressed_size);
efree(buffer);
zend_string_forget_hash_val(payload);
*payload_in = payload;

zend_string_forget_hash_val(payload);
*payload_in = payload;
return 1;
return 1;
}

/* Original payload was not modified */
return 0;
}

static
Expand Down Expand Up @@ -1043,11 +1042,13 @@ zend_string *s_zval_to_payload(php_memc_object_t *intern, zval *value, uint32_t

/* If we have compression flag, compress the value */
if (should_compress) {
/* status */
if (!s_compress_value (memc_user_data->compression_type, &payload, flags)) {
zend_string_release(payload);
return NULL;
}
/* s_compress_value() will always leave a valid payload, even if that payload
* did not actually get compressed. The flags will be set according to the
* to the compression type or no compression.
*
* No need to check the return value because the payload is always valid.
*/
(void)s_compress_value (memc_user_data->compression_type, &payload, flags);
}

if (memc_user_data->set_udf_flags >= 0) {
Expand Down
2 changes: 0 additions & 2 deletions tests/compression_conditions.phpt
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Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,6 @@ bool(true)
len=[4877] set=[] factor=[1.3] threshold=[4]
bool(true)
len=[7] set=[zlib] factor=[1.3] threshold=[4]
Memcached::set(): could not compress value
bool(true)
len=[7] set=[fastlz] factor=[1.3] threshold=[4]
bool(true)
Expand All @@ -93,7 +92,6 @@ bool(true)
len=[4877] set=[] factor=[0.3] threshold=[4]
bool(true)
len=[7] set=[zlib] factor=[0.3] threshold=[4]
Memcached::set(): could not compress value
bool(true)
len=[7] set=[fastlz] factor=[0.3] threshold=[4]
bool(true)
Expand Down