libcruft-util/zlib.cpp
Danny Robson f6056153e3 rename root namespace from util to cruft
This places, at long last, the core library code into the same namespace
as the extended library code.
2018-08-05 14:42:02 +10:00

97 lines
2.0 KiB
C++

/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright:
* 2013-2015, Danny Robson <danny@nerdcruft.net>
*/
#include "zlib.hpp"
#include "debug.hpp"
const char *
cruft::zlib::version (void) {
return zlibVersion ();
}
const char*
cruft::zlib::code_to_string (int code) {
static const int MIN_CODE = -6;
static const int MAX_CODE = 2;
if (code > MAX_CODE || code < MIN_CODE) {
unreachable ();
}
static const char* CODES[] = {
"OK",
"STREAM_END",
"NEED_DICT",
"ERRNO",
"STREAM_ERROR",
"DATA_ERROR",
"MEM_ERROR",
"BUF_ERROR",
"VERSION_ERROR",
};
return CODES[code + MIN_CODE];
}
size_t
cruft::zlib::uncompress (uint8_t *dst, size_t dst_len,
const uint8_t *src, size_t src_len) {
size_t actual_len = dst_len;
uLongf zlib_actual = actual_len;
int err = ::uncompress (dst, &zlib_actual, src, src_len);
error::try_code (err);
actual_len = zlib_actual;
return actual_len;
}
void
cruft::zlib::error::try_code (int code) {
if (Z_OK == code)
return;
throw_code(code);
}
cruft::zlib::error::error (const std::string &_what):
runtime_error (_what)
{ ; }
void
cruft::zlib::error::throw_code (int code) {
CHECK_NEQ (code, Z_OK);
switch (code) {
#define do_code(c) case c: throw code_error<c> ();
do_code(Z_STREAM_ERROR);
do_code(Z_DATA_ERROR);
do_code(Z_MEM_ERROR);
do_code(Z_BUF_ERROR);
do_code(Z_VERSION_ERROR);
default:
panic ("Unknown code");
}
}
template class cruft::zlib::code_error<Z_STREAM_ERROR>;
template class cruft::zlib::code_error<Z_DATA_ERROR>;
template class cruft::zlib::code_error<Z_MEM_ERROR>;
template class cruft::zlib::code_error<Z_BUF_ERROR>;
template class cruft::zlib::code_error<Z_VERSION_ERROR>;