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pollymc/libraries/pack200/src/bands.cpp
Petr Mrázek bbb3b3e6f6 NOISSUE tabs -> spaces
2018-07-15 14:51:05 +02:00

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/*
* Copyright (c) 2002, 2009, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
// -*- C++ -*-
// Small program for unpacking specially compressed Java packages.
// John R. Rose
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
#include <stdint.h>
#include "defines.h"
#include "bytes.h"
#include "utils.h"
#include "coding.h"
#include "bands.h"
#include "constants.h"
#include "unpack.h"
void band::readData(int expectedLength)
{
assert(expectedLength >= 0);
assert(vs[0].cmk == cmk_ERROR);
if (expectedLength != 0)
{
assert(length == 0);
length = expectedLength;
}
if (length == 0)
{
assert((rplimit = cm.vs0.rp = u->rp) != nullptr);
return;
}
assert(length > 0);
bool is_BYTE1 = (defc->spec == BYTE1_spec);
if (is_BYTE1)
{
// No possibility of coding change. Sizing is exact.
u->ensure_input(length);
}
else
{
// Make a conservatively generous estimate of band size in bytes.
// Assume B == 5 everywhere.
// Assume awkward pop with all {U} values (2*5 per value)
int64_t generous = (int64_t)length * (B_MAX * 3 + 1) + C_SLOP;
u->ensure_input(generous);
}
// Read one value to see what it might be.
int XB = _meta_default;
if (!is_BYTE1)
{
// must be a variable-length coding
assert(defc->B() > 1 && defc->L() > 0);
value_stream xvs;
coding *valc = defc;
if (valc->D() != 0)
{
valc = coding::findBySpec(defc->B(), defc->H(), defc->S());
assert(!valc->isMalloc);
}
xvs.init(u->rp, u->rplimit, valc);
int X = xvs.getInt();
if (valc->S() != 0)
{
assert(valc->min <= -256);
XB = -1 - X;
}
else
{
int L = valc->L();
assert(valc->max >= L + 255);
XB = X - L;
}
if (0 <= XB && XB < 256)
{
// Skip over the escape value.
u->rp = xvs.rp;
}
else
{
// No, it's still default.
XB = _meta_default;
}
}
if (XB <= _meta_canon_max)
{
byte XB_byte = (byte)XB;
byte *XB_ptr = &XB_byte;
cm.init(u->rp, u->rplimit, XB_ptr, 0, defc, length, nullptr);
}
else
{
assert(u->meta_rp != nullptr);
// Scribble the initial byte onto the band.
byte *save_meta_rp = --u->meta_rp;
byte save_meta_xb = (*save_meta_rp);
(*save_meta_rp) = (byte)XB;
cm.init(u->rp, u->rplimit, u->meta_rp, 0, defc, length, nullptr);
(*save_meta_rp) = save_meta_xb; // put it back, just to be tidy
}
rplimit = u->rp;
rewind();
}
void band::setIndex(cpindex *ix_)
{
assert(ix_ == nullptr || ixTag == ix_->ixTag);
ix = ix_;
}
void band::setIndexByTag(byte tag)
{
setIndex(u->cp.getIndex(tag));
}
entry *band::getRefCommon(cpindex *ix_, bool nullOKwithCaller)
{
assert(ix_->ixTag == ixTag ||
(ixTag == CONSTANT_Literal && ix_->ixTag >= CONSTANT_Integer &&
ix_->ixTag <= CONSTANT_String));
int n = vs[0].getInt() - nullOK;
// Note: band-local nullOK means nullptr encodes as 0.
// But nullOKwithCaller means caller is willing to tolerate a nullptr.
entry *ref = ix_->get(n);
if (ref == nullptr && !(nullOKwithCaller && n == -1))
unpack_abort(n == -1 ? "nullptr ref" : "bad ref");
return ref;
}
int64_t band::getLong(band &lo_band, bool have_hi)
{
band &hi_band = (*this);
assert(lo_band.bn == hi_band.bn + 1);
uint32_t lo = lo_band.getInt();
if (!have_hi)
{
assert(hi_band.length == 0);
return makeLong(0, lo);
}
uint32_t hi = hi_band.getInt();
return makeLong(hi, lo);
}
int band::getIntTotal()
{
if (length == 0)
return 0;
if (total_memo > 0)
return total_memo - 1;
int total = getInt();
// overflow checks require that none of the addends are <0,
// and that the partial sums never overflow (wrap negative)
if (total < 0)
{
unpack_abort("overflow detected");
}
for (int k = length - 1; k > 0; k--)
{
int prev_total = total;
total += vs[0].getInt();
if (total < prev_total)
{
unpack_abort("overflow detected");
}
}
rewind();
total_memo = total + 1;
return total;
}
int band::getIntCount(int tag)
{
if (length == 0)
return 0;
if (tag >= HIST0_MIN && tag <= HIST0_MAX)
{
if (hist0 == nullptr)
{
// Lazily calculate an approximate histogram.
hist0 = U_NEW(int, (HIST0_MAX - HIST0_MIN) + 1);
for (int k = length; k > 0; k--)
{
int x = vs[0].getInt();
if (x >= HIST0_MIN && x <= HIST0_MAX)
hist0[x - HIST0_MIN] += 1;
}
rewind();
}
return hist0[tag - HIST0_MIN];
}
int total = 0;
for (int k = length; k > 0; k--)
{
total += (vs[0].getInt() == tag) ? 1 : 0;
}
rewind();
return total;
}
#define INDEX_INIT(tag, nullOK, subindex) ((tag) + (subindex) * SUBINDEX_BIT + (nullOK) * 256)
#define INDEX(tag) INDEX_INIT(tag, 0, 0)
#define NULL_OR_INDEX(tag) INDEX_INIT(tag, 1, 0)
#define SUB_INDEX(tag) INDEX_INIT(tag, 0, 1)
#define NO_INDEX 0
struct band_init
{
int defc;
int index;
};
#define BAND_INIT(name, cspec, ix) \
{ \
cspec, ix \
}
const band_init all_band_inits[] =
{
// BAND_INIT(archive_magic, BYTE1_spec, 0),
// BAND_INIT(archive_header, UNSIGNED5_spec, 0),
// BAND_INIT(band_headers, BYTE1_spec, 0),
BAND_INIT(cp_Utf8_prefix, DELTA5_spec, 0), BAND_INIT(cp_Utf8_suffix, UNSIGNED5_spec, 0),
BAND_INIT(cp_Utf8_chars, CHAR3_spec, 0), BAND_INIT(cp_Utf8_big_suffix, DELTA5_spec, 0),
BAND_INIT(cp_Utf8_big_chars, DELTA5_spec, 0), BAND_INIT(cp_Int, UDELTA5_spec, 0),
BAND_INIT(cp_Float, UDELTA5_spec, 0), BAND_INIT(cp_Long_hi, UDELTA5_spec, 0),
BAND_INIT(cp_Long_lo, DELTA5_spec, 0), BAND_INIT(cp_Double_hi, UDELTA5_spec, 0),
BAND_INIT(cp_Double_lo, DELTA5_spec, 0),
BAND_INIT(cp_String, UDELTA5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(cp_Class, UDELTA5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(cp_Signature_form, DELTA5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(cp_Signature_classes, UDELTA5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(cp_Descr_name, DELTA5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(cp_Descr_type, UDELTA5_spec, INDEX(CONSTANT_Signature)),
BAND_INIT(cp_Field_class, DELTA5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(cp_Field_desc, UDELTA5_spec, INDEX(CONSTANT_NameandType)),
BAND_INIT(cp_Method_class, DELTA5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(cp_Method_desc, UDELTA5_spec, INDEX(CONSTANT_NameandType)),
BAND_INIT(cp_Imethod_class, DELTA5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(cp_Imethod_desc, UDELTA5_spec, INDEX(CONSTANT_NameandType)),
BAND_INIT(attr_definition_headers, BYTE1_spec, 0),
BAND_INIT(attr_definition_name, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(attr_definition_layout, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(ic_this_class, UDELTA5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(ic_flags, UNSIGNED5_spec, 0),
BAND_INIT(ic_outer_class, DELTA5_spec, NULL_OR_INDEX(CONSTANT_Class)),
BAND_INIT(ic_name, DELTA5_spec, NULL_OR_INDEX(CONSTANT_Utf8)),
BAND_INIT(class_this, DELTA5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(class_super, DELTA5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(class_interface_count, DELTA5_spec, 0),
BAND_INIT(class_interface, DELTA5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(class_field_count, DELTA5_spec, 0),
BAND_INIT(class_method_count, DELTA5_spec, 0),
BAND_INIT(field_descr, DELTA5_spec, INDEX(CONSTANT_NameandType)),
BAND_INIT(field_flags_hi, UNSIGNED5_spec, 0),
BAND_INIT(field_flags_lo, UNSIGNED5_spec, 0),
BAND_INIT(field_attr_count, UNSIGNED5_spec, 0),
BAND_INIT(field_attr_indexes, UNSIGNED5_spec, 0),
BAND_INIT(field_attr_calls, UNSIGNED5_spec, 0),
BAND_INIT(field_ConstantValue_KQ, UNSIGNED5_spec, INDEX(CONSTANT_Literal)),
BAND_INIT(field_Signature_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
BAND_INIT(field_metadata_bands, -1, -1), BAND_INIT(field_attr_bands, -1, -1),
BAND_INIT(method_descr, MDELTA5_spec, INDEX(CONSTANT_NameandType)),
BAND_INIT(method_flags_hi, UNSIGNED5_spec, 0),
BAND_INIT(method_flags_lo, UNSIGNED5_spec, 0),
BAND_INIT(method_attr_count, UNSIGNED5_spec, 0),
BAND_INIT(method_attr_indexes, UNSIGNED5_spec, 0),
BAND_INIT(method_attr_calls, UNSIGNED5_spec, 0),
BAND_INIT(method_Exceptions_N, UNSIGNED5_spec, 0),
BAND_INIT(method_Exceptions_RC, UNSIGNED5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(method_Signature_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
BAND_INIT(method_metadata_bands, -1, -1), BAND_INIT(method_attr_bands, -1, -1),
BAND_INIT(class_flags_hi, UNSIGNED5_spec, 0),
BAND_INIT(class_flags_lo, UNSIGNED5_spec, 0),
BAND_INIT(class_attr_count, UNSIGNED5_spec, 0),
BAND_INIT(class_attr_indexes, UNSIGNED5_spec, 0),
BAND_INIT(class_attr_calls, UNSIGNED5_spec, 0),
BAND_INIT(class_SourceFile_RUN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Utf8)),
BAND_INIT(class_EnclosingMethod_RC, UNSIGNED5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(class_EnclosingMethod_RDN, UNSIGNED5_spec,
NULL_OR_INDEX(CONSTANT_NameandType)),
BAND_INIT(class_Signature_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
BAND_INIT(class_metadata_bands, -1, -1),
BAND_INIT(class_InnerClasses_N, UNSIGNED5_spec, 0),
BAND_INIT(class_InnerClasses_RC, UNSIGNED5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(class_InnerClasses_F, UNSIGNED5_spec, 0),
BAND_INIT(class_InnerClasses_outer_RCN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Class)),
BAND_INIT(class_InnerClasses_name_RUN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Utf8)),
BAND_INIT(class_ClassFile_version_minor_H, UNSIGNED5_spec, 0),
BAND_INIT(class_ClassFile_version_major_H, UNSIGNED5_spec, 0),
BAND_INIT(class_attr_bands, -1, -1), BAND_INIT(code_headers, BYTE1_spec, 0),
BAND_INIT(code_max_stack, UNSIGNED5_spec, 0),
BAND_INIT(code_max_na_locals, UNSIGNED5_spec, 0),
BAND_INIT(code_handler_count, UNSIGNED5_spec, 0),
BAND_INIT(code_handler_start_P, BCI5_spec, 0),
BAND_INIT(code_handler_end_PO, BRANCH5_spec, 0),
BAND_INIT(code_handler_catch_PO, BRANCH5_spec, 0),
BAND_INIT(code_handler_class_RCN, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Class)),
BAND_INIT(code_flags_hi, UNSIGNED5_spec, 0),
BAND_INIT(code_flags_lo, UNSIGNED5_spec, 0),
BAND_INIT(code_attr_count, UNSIGNED5_spec, 0),
BAND_INIT(code_attr_indexes, UNSIGNED5_spec, 0),
BAND_INIT(code_attr_calls, UNSIGNED5_spec, 0),
BAND_INIT(code_StackMapTable_N, UNSIGNED5_spec, 0),
BAND_INIT(code_StackMapTable_frame_T, BYTE1_spec, 0),
BAND_INIT(code_StackMapTable_local_N, UNSIGNED5_spec, 0),
BAND_INIT(code_StackMapTable_stack_N, UNSIGNED5_spec, 0),
BAND_INIT(code_StackMapTable_offset, UNSIGNED5_spec, 0),
BAND_INIT(code_StackMapTable_T, BYTE1_spec, 0),
BAND_INIT(code_StackMapTable_RC, UNSIGNED5_spec, INDEX(CONSTANT_Class)),
BAND_INIT(code_StackMapTable_P, BCI5_spec, 0),
BAND_INIT(code_LineNumberTable_N, UNSIGNED5_spec, 0),
BAND_INIT(code_LineNumberTable_bci_P, BCI5_spec, 0),
BAND_INIT(code_LineNumberTable_line, UNSIGNED5_spec, 0),
BAND_INIT(code_LocalVariableTable_N, UNSIGNED5_spec, 0),
BAND_INIT(code_LocalVariableTable_bci_P, BCI5_spec, 0),
BAND_INIT(code_LocalVariableTable_span_O, BRANCH5_spec, 0),
BAND_INIT(code_LocalVariableTable_name_RU, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(code_LocalVariableTable_type_RS, UNSIGNED5_spec, INDEX(CONSTANT_Signature)),
BAND_INIT(code_LocalVariableTable_slot, UNSIGNED5_spec, 0),
BAND_INIT(code_LocalVariableTypeTable_N, UNSIGNED5_spec, 0),
BAND_INIT(code_LocalVariableTypeTable_bci_P, BCI5_spec, 0),
BAND_INIT(code_LocalVariableTypeTable_span_O, BRANCH5_spec, 0),
BAND_INIT(code_LocalVariableTypeTable_name_RU, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(code_LocalVariableTypeTable_type_RS, UNSIGNED5_spec,
INDEX(CONSTANT_Signature)),
BAND_INIT(code_LocalVariableTypeTable_slot, UNSIGNED5_spec, 0),
BAND_INIT(code_attr_bands, -1, -1), BAND_INIT(bc_codes, BYTE1_spec, 0),
BAND_INIT(bc_case_count, UNSIGNED5_spec, 0), BAND_INIT(bc_case_value, DELTA5_spec, 0),
BAND_INIT(bc_byte, BYTE1_spec, 0), BAND_INIT(bc_short, DELTA5_spec, 0),
BAND_INIT(bc_local, UNSIGNED5_spec, 0), BAND_INIT(bc_label, BRANCH5_spec, 0),
BAND_INIT(bc_intref, DELTA5_spec, INDEX(CONSTANT_Integer)),
BAND_INIT(bc_floatref, DELTA5_spec, INDEX(CONSTANT_Float)),
BAND_INIT(bc_longref, DELTA5_spec, INDEX(CONSTANT_Long)),
BAND_INIT(bc_doubleref, DELTA5_spec, INDEX(CONSTANT_Double)),
BAND_INIT(bc_stringref, DELTA5_spec, INDEX(CONSTANT_String)),
BAND_INIT(bc_classref, UNSIGNED5_spec, NULL_OR_INDEX(CONSTANT_Class)),
BAND_INIT(bc_fieldref, DELTA5_spec, INDEX(CONSTANT_Fieldref)),
BAND_INIT(bc_methodref, UNSIGNED5_spec, INDEX(CONSTANT_Methodref)),
BAND_INIT(bc_imethodref, DELTA5_spec, INDEX(CONSTANT_InterfaceMethodref)),
BAND_INIT(bc_thisfield, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Fieldref)),
BAND_INIT(bc_superfield, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Fieldref)),
BAND_INIT(bc_thismethod, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Methodref)),
BAND_INIT(bc_supermethod, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Methodref)),
BAND_INIT(bc_initref, UNSIGNED5_spec, SUB_INDEX(CONSTANT_Methodref)),
BAND_INIT(bc_escref, UNSIGNED5_spec, INDEX(CONSTANT_All)),
BAND_INIT(bc_escrefsize, UNSIGNED5_spec, 0), BAND_INIT(bc_escsize, UNSIGNED5_spec, 0),
BAND_INIT(bc_escbyte, BYTE1_spec, 0),
BAND_INIT(file_name, UNSIGNED5_spec, INDEX(CONSTANT_Utf8)),
BAND_INIT(file_size_hi, UNSIGNED5_spec, 0), BAND_INIT(file_size_lo, UNSIGNED5_spec, 0),
BAND_INIT(file_modtime, DELTA5_spec, 0), BAND_INIT(file_options, UNSIGNED5_spec, 0),
// BAND_INIT(file_bits, BYTE1_spec, 0),
{0, 0}};
band *band::makeBands(unpacker *u)
{
band *tmp_all_bands = U_NEW(band, BAND_LIMIT);
for (int i = 0; i < BAND_LIMIT; i++)
{
assert((byte *)&all_band_inits[i + 1] <
(byte *)all_band_inits + sizeof(all_band_inits));
const band_init &bi = all_band_inits[i];
band &b = tmp_all_bands[i];
coding *defc = coding::findBySpec(bi.defc);
assert((defc == nullptr) == (bi.defc == -1)); // no garbage, please
assert(defc == nullptr || !defc->isMalloc);
b.init(u, i, defc);
if (bi.index > 0)
{
b.nullOK = ((bi.index >> 8) & 1);
b.ixTag = (bi.index & 0xFF);
}
}
return tmp_all_bands;
}
void band::initIndexes(unpacker *u)
{
band *tmp_all_bands = u->all_bands;
for (int i = 0; i < BAND_LIMIT; i++)
{
band *scan = &tmp_all_bands[i];
uint32_t tag = scan->ixTag; // Cf. #define INDEX(tag) above
if (tag != 0 && tag != CONSTANT_Literal && (tag & SUBINDEX_BIT) == 0)
{
scan->setIndex(u->cp.getIndex(tag));
}
}
}
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