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llvm-project/llvm/lib/Support/Compressor.cpp

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//===- lib/Support/Compressor.cpp -------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the llvm::Compressor class, an abstraction for memory
// block compression.
//
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h"
#include "llvm/Support/Compressor.h"
#include "llvm/ADT/StringExtras.h"
#include <cassert>
#include <string>
#ifdef HAVE_BZIP2
#include <bzlib.h>
#endif
#ifdef HAVE_ZLIB
#include <zlib.h>
#endif
namespace {
inline int getdata(char*& buffer, unsigned& size,
llvm::Compressor::OutputDataCallback* cb, void* context) {
buffer = 0;
size = 0;
int result = (*cb)(buffer, size, context);
assert(buffer != 0 && "Invalid result from Compressor callback");
assert(size != 0 && "Invalid result from Compressor callback");
return result;
}
//===----------------------------------------------------------------------===//
//=== NULLCOMP - a compression like set of routines that just copies data
//=== without doing any compression. This is provided so that if the
//=== configured environment doesn't have a compression library the
//=== program can still work, albeit using more data/memory.
//===----------------------------------------------------------------------===//
struct NULLCOMP_stream {
// User provided fields
char* next_in;
unsigned avail_in;
char* next_out;
unsigned avail_out;
// Information fields
uint64_t output_count; // Total count of output bytes
};
void NULLCOMP_init(NULLCOMP_stream* s) {
s->output_count = 0;
}
bool NULLCOMP_compress(NULLCOMP_stream* s) {
assert(s && "Invalid NULLCOMP_stream");
assert(s->next_in != 0);
assert(s->next_out != 0);
assert(s->avail_in >= 1);
assert(s->avail_out >= 1);
if (s->avail_out >= s->avail_in) {
::memcpy(s->next_out, s->next_in, s->avail_in);
s->output_count += s->avail_in;
s->avail_out -= s->avail_in;
s->next_in += s->avail_in;
s->avail_in = 0;
return true;
} else {
::memcpy(s->next_out, s->next_in, s->avail_out);
s->output_count += s->avail_out;
s->avail_in -= s->avail_out;
s->next_in += s->avail_out;
s->avail_out = 0;
return false;
}
}
bool NULLCOMP_decompress(NULLCOMP_stream* s) {
assert(s && "Invalid NULLCOMP_stream");
assert(s->next_in != 0);
assert(s->next_out != 0);
assert(s->avail_in >= 1);
assert(s->avail_out >= 1);
if (s->avail_out >= s->avail_in) {
::memcpy(s->next_out, s->next_in, s->avail_in);
s->output_count += s->avail_in;
s->avail_out -= s->avail_in;
s->next_in += s->avail_in;
s->avail_in = 0;
return true;
} else {
::memcpy(s->next_out, s->next_in, s->avail_out);
s->output_count += s->avail_out;
s->avail_in -= s->avail_out;
s->next_in += s->avail_out;
s->avail_out = 0;
return false;
}
}
void NULLCOMP_end(NULLCOMP_stream* strm) {
}
}
namespace llvm {
// Compress in one of three ways
uint64_t Compressor::compress(char* in, unsigned size, OutputDataCallback* cb,
Algorithm hint, void* context ) {
assert(in && "Can't compress null buffer");
assert(size && "Can't compress empty buffer");
assert(cb && "Can't compress without a callback function");
uint64_t result = 0;
switch (hint) {
case COMP_TYPE_BZIP2: {
#if defined(HAVE_BZIP2)
// Set up the bz_stream
bz_stream bzdata;
bzdata.bzalloc = 0;
bzdata.bzfree = 0;
bzdata.opaque = 0;
bzdata.next_in = in;
bzdata.avail_in = size;
bzdata.next_out = 0;
bzdata.avail_out = 0;
switch ( BZ2_bzCompressInit(&bzdata, 9, 0, 100) ) {
case BZ_CONFIG_ERROR: throw std::string("bzip2 library mis-compiled");
case BZ_PARAM_ERROR: throw std::string("Compressor internal error");
case BZ_MEM_ERROR: throw std::string("Out of memory");
case BZ_OK:
default:
break;
}
// Get a block of memory
if (0 != getdata(bzdata.next_out, bzdata.avail_out,cb,context)) {
BZ2_bzCompressEnd(&bzdata);
throw std::string("Can't allocate output buffer");
}
// Put compression code in first byte
(*bzdata.next_out++) = COMP_TYPE_BZIP2;
bzdata.avail_out--;
// Compress it
int bzerr = BZ_FINISH_OK;
while (BZ_FINISH_OK == (bzerr = BZ2_bzCompress(&bzdata, BZ_FINISH))) {
if (0 != getdata(bzdata.next_out, bzdata.avail_out,cb,context)) {
BZ2_bzCompressEnd(&bzdata);
throw std::string("Can't allocate output buffer");
}
}
switch (bzerr) {
case BZ_SEQUENCE_ERROR:
case BZ_PARAM_ERROR: throw std::string("Param/Sequence error");
case BZ_FINISH_OK:
case BZ_STREAM_END: break;
default: throw std::string("Oops: ") + utostr(unsigned(bzerr));
}
// Finish
result = (static_cast<uint64_t>(bzdata.total_out_hi32) << 32) |
bzdata.total_out_lo32 + 1;
BZ2_bzCompressEnd(&bzdata);
break;
#else
// FALL THROUGH
#endif
}
case COMP_TYPE_ZLIB: {
#if defined(HAVE_ZLIB)
z_stream zdata;
zdata.zalloc = Z_NULL;
zdata.zfree = Z_NULL;
zdata.opaque = Z_NULL;
zdata.next_in = reinterpret_cast<Bytef*>(in);
zdata.avail_in = size;
if (Z_OK != deflateInit(&zdata,Z_BEST_COMPRESSION))
throw std::string(zdata.msg ? zdata.msg : "zlib error");
if (0 != getdata((char*&)(zdata.next_out), zdata.avail_out,cb,context)) {
deflateEnd(&zdata);
throw std::string("Can't allocate output buffer");
}
(*zdata.next_out++) = COMP_TYPE_ZLIB;
zdata.avail_out--;
int flush = 0;
while ( Z_OK == deflate(&zdata,0) && zdata.avail_out == 0) {
if (0 != getdata((char*&)zdata.next_out, zdata.avail_out, cb,context)) {
deflateEnd(&zdata);
throw std::string("Can't allocate output buffer");
}
}
while ( Z_STREAM_END != deflate(&zdata, Z_FINISH)) {
if (0 != getdata((char*&)zdata.next_out, zdata.avail_out, cb,context)) {
deflateEnd(&zdata);
throw std::string("Can't allocate output buffer");
}
}
result = static_cast<uint64_t>(zdata.total_out) + 1;
deflateEnd(&zdata);
break;
#else
// FALL THROUGH
#endif
}
case COMP_TYPE_SIMPLE: {
NULLCOMP_stream sdata;
sdata.next_in = in;
sdata.avail_in = size;
NULLCOMP_init(&sdata);
if (0 != getdata(sdata.next_out, sdata.avail_out,cb,context)) {
throw std::string("Can't allocate output buffer");
}
*(sdata.next_out++) = COMP_TYPE_SIMPLE;
sdata.avail_out--;
while (!NULLCOMP_compress(&sdata)) {
if (0 != getdata(sdata.next_out, sdata.avail_out,cb,context)) {
throw std::string("Can't allocate output buffer");
}
}
result = sdata.output_count + 1;
NULLCOMP_end(&sdata);
break;
}
default:
throw std::string("Invalid compression type hint");
}
return result;
}
// Decompress in one of three ways
uint64_t Compressor::decompress(char *in, unsigned size,
OutputDataCallback* cb, void* context) {
assert(in && "Can't decompress null buffer");
assert(size > 1 && "Can't decompress empty buffer");
assert(cb && "Can't decompress without a callback function");
uint64_t result = 0;
switch (*in++) {
case COMP_TYPE_BZIP2: {
#if !defined(HAVE_BZIP2)
throw std::string("Can't decompress BZIP2 data");
#else
// Set up the bz_stream
bz_stream bzdata;
bzdata.bzalloc = 0;
bzdata.bzfree = 0;
bzdata.opaque = 0;
bzdata.next_in = in;
bzdata.avail_in = size - 1;
bzdata.next_out = 0;
bzdata.avail_out = 0;
switch ( BZ2_bzDecompressInit(&bzdata, 0, 0) ) {
case BZ_CONFIG_ERROR: throw std::string("bzip2 library mis-compiled");
case BZ_PARAM_ERROR: throw std::string("Compressor internal error");
case BZ_MEM_ERROR: throw std::string("Out of memory");
case BZ_OK:
default:
break;
}
// Get a block of memory
if (0 != getdata(bzdata.next_out, bzdata.avail_out,cb,context)) {
BZ2_bzDecompressEnd(&bzdata);
throw std::string("Can't allocate output buffer");
}
// Decompress it
int bzerr = BZ_OK;
while (BZ_OK == (bzerr = BZ2_bzDecompress(&bzdata))) {
if (0 != getdata(bzdata.next_out, bzdata.avail_out,cb,context)) {
BZ2_bzDecompressEnd(&bzdata);
throw std::string("Can't allocate output buffer");
}
}
switch (bzerr) {
case BZ_PARAM_ERROR: throw std::string("Compressor internal error");
case BZ_MEM_ERROR: throw std::string("Out of memory");
case BZ_DATA_ERROR: throw std::string("Data integrity error");
case BZ_DATA_ERROR_MAGIC:throw std::string("Data is not BZIP2");
default: throw("Ooops");
case BZ_STREAM_END:
break;
}
// Finish
result = (static_cast<uint64_t>(bzdata.total_out_hi32) << 32) |
bzdata.total_out_lo32;
BZ2_bzDecompressEnd(&bzdata);
break;
#endif
}
case COMP_TYPE_ZLIB: {
#if !defined(HAVE_ZLIB)
throw std::string("Can't decompress ZLIB data");
#else
z_stream zdata;
zdata.zalloc = Z_NULL;
zdata.zfree = Z_NULL;
zdata.opaque = Z_NULL;
zdata.next_in = reinterpret_cast<Bytef*>(in);
zdata.avail_in = size - 1;
if ( Z_OK != inflateInit(&zdata))
throw std::string(zdata.msg ? zdata.msg : "zlib error");
if (0 != getdata((char*&)zdata.next_out, zdata.avail_out,cb,context)) {
inflateEnd(&zdata);
throw std::string("Can't allocate output buffer");
}
int zerr = Z_OK;
while (Z_OK == (zerr = inflate(&zdata,0))) {
if (0 != getdata((char*&)zdata.next_out, zdata.avail_out,cb,context)) {
inflateEnd(&zdata);
throw std::string("Can't allocate output buffer");
}
}
if (zerr != Z_STREAM_END)
throw std::string(zdata.msg?zdata.msg:"zlib error");
result = static_cast<uint64_t>(zdata.total_out);
inflateEnd(&zdata);
break;
#endif
}
case COMP_TYPE_SIMPLE: {
NULLCOMP_stream sdata;
sdata.next_in = in;
sdata.avail_in = size - 1;
NULLCOMP_init(&sdata);
if (0 != getdata(sdata.next_out, sdata.avail_out,cb,context)) {
throw std::string("Can't allocate output buffer");
}
while (!NULLCOMP_decompress(&sdata)) {
if (0 != getdata(sdata.next_out, sdata.avail_out,cb,context)) {
throw std::string("Can't allocate output buffer");
}
}
result = sdata.output_count;
NULLCOMP_end(&sdata);
break;
}
default:
throw std::string("Unknown type of compressed data");
}
return result;
}
}
// vim: sw=2 ai
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