10-19-2015
Reading binary content
Dear Gurus
I am stuck with the peice of work and do not know from where to start.
I get a machine generated file which is binary file contain binary data, i want to read binary data as it is without converting into any other format.
i want to read byte by byte.
Please let me know what unix command will show the content of the binary file in binary format itself.
when i do cat file name then the output looks like below content
zð cH$zp b$zp c$zð b$zð c*$zp b*$zp c¢$zð b¢$zð cF«$zp%+*$zp%*¼$zð%*Á$zð
I want to see in the binary format and read byte by byte.
any help will be greatly appriciated
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LEARN ABOUT PHP
pg_unescape_bytea
PG_UNESCAPE_BYTEA(3) PG_UNESCAPE_BYTEA(3)
pg_unescape_bytea - Unescape binary for bytea type
SYNOPSIS
string pg_unescape_bytea (string $data)
DESCRIPTION
pg_unescape_bytea(3) unescapes PostgreSQL bytea data values. It returns the unescaped string, possibly containing binary data.
Note
When you SELECT a bytea type, PostgreSQL returns octal byte values prefixed with '' (e.g. 32). Users are supposed to convert
back to binary format manually.
This function requires PostgreSQL 7.2 or later. With PostgreSQL 7.2.0 and 7.2.1, bytea values must be cast when you enable multi-
byte support. i.e. INSERT INTO test_table (image) VALUES ('$image_escaped'::bytea); PostgreSQL 7.2.2 or later does not need a cast.
The exception is when the client and backend character encoding does not match, and there may be multi-byte stream error. User must
then cast to bytea to avoid this error.
PARAMETERS
o $data
- A string containing PostgreSQL bytea data to be converted into a PHP binary string.
RETURN VALUES
A string containing the unescaped data.
EXAMPLES
Example #1
pg_unescape_bytea(3) example
<?php
// Connect to the database
$dbconn = pg_connect('dbname=foo');
// Get the bytea data
$res = pg_query("SELECT data FROM gallery WHERE name='Pine trees'");
$raw = pg_fetch_result($res, 'data');
// Convert to binary and send to the browser
header('Content-type: image/jpeg');
echo pg_unescape_bytea($raw);
?>
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.5.1 | |
| | |
| | A warning is thrown if the input string is |
| | invalid. |
| | |
+--------+---------------------------------------------------+
SEE ALSO
pg_escape_bytea(3), pg_escape_string(3).
PHP Documentation Group PG_UNESCAPE_BYTEA(3)