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MINOR: samples: adds the bytes converter.

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bytes(<offset>[,<length>])
  Extracts a some bytes from an input binary sample. The result is a
  binary sample starting at an offset (in bytes) of the original sample
  and optionnaly truncated at the given length.
This commit is contained in:
Emeric Brun 2014-11-03 15:32:43 +01:00 committed by Willy Tarreau
parent 0f30d26dbf
commit 54c4ac8417
2 changed files with 27 additions and 0 deletions
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5
doc/configuration.txt
View File

@ -10036,6 +10036,11 @@ base64
transfer binary content in a way that can be reliably transferred (eg:
an SSL ID can be copied in a header).
bytes(<offset>[,<length>])
Extracts some bytes from an input binary sample. The result is a binary
sample starting at an offset (in bytes) of the original sample and
optionnaly truncated at the given length.
djb2([<avalanche>])
Hashes a binary input sample into an unsigned 32-bit quantity using the DJB2
hash function. Optionally, it is possible to apply a full avalanche hash

22
src/sample.c
View File

@ -1562,6 +1562,27 @@ static int sample_conv_json(const struct arg *arg_p, struct sample *smp)
return 1;
}
/* This sample function is designed to extract some bytes from an input buffer.
* First arg is the offset.
* Optional second arg is the length to truncate */
static int sample_conv_bytes(const struct arg *arg_p, struct sample *smp)
{
if (smp->data.str.len <= arg_p[0].data.uint) {
smp->data.str.len = 0;
return 1;
}
if (smp->data.str.size)
smp->data.str.size -= arg_p[0].data.uint;
smp->data.str.len -= arg_p[0].data.uint;
smp->data.str.str += arg_p[0].data.uint;
if ((arg_p[1].type == ARGT_UINT) && (arg_p[1].data.uint < smp->data.str.len))
smp->data.str.len = arg_p[1].data.uint;
return 1;
}
/************************************************************************/
/* All supported sample fetch functions must be declared here */
/************************************************************************/
@ -1703,6 +1724,7 @@ static struct sample_conv_kw_list sample_conv_kws = {ILH, {
{ "sdbm", sample_conv_sdbm, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ "wt6", sample_conv_wt6, ARG1(0,UINT), NULL, SMP_T_BIN, SMP_T_UINT },
{ "json", sample_conv_json, ARG1(1,STR), sample_conv_json_check, SMP_T_STR, SMP_T_STR },
{ "bytes", sample_conv_bytes, ARG2(1,UINT,UINT), NULL, SMP_T_BIN, SMP_T_BIN },
{ NULL, NULL, 0, 0, 0 },
}};