libcruft-util/zlib.cpp

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2013-07-13 15:28:29 +10:00
#include "zlib.hpp"
#include "debug.hpp"
const char *
util::zlib::version (void) {
return zlibVersion ();
}
const char*
util::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];
}
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size_t
util::zlib::uncompress (uint8_t *dst, size_t dst_len,
const uint8_t *src, size_t src_len) {
size_t actual_len = dst_len;
int err = ::uncompress (dst, &actual_len, src, src_len);
error::try_code (err);
return actual_len;
}
void
util::zlib::error::try_code (int code) {
if (Z_OK == code)
return;
throw_code(code);
}
util::zlib::error::error (const std::string &_what):
runtime_error (_what)
{ ; }
void
util::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 util::zlib::code_error<Z_STREAM_ERROR>;
template class util::zlib::code_error<Z_DATA_ERROR>;
template class util::zlib::code_error<Z_MEM_ERROR>;
template class util::zlib::code_error<Z_BUF_ERROR>;
template class util::zlib::code_error<Z_VERSION_ERROR>;