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zip.cc
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/*
* This file is part of the Advance project.
*
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004 Andrea Mazzoleni
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "portable.h"
#include "zip.h"
#include "siglock.h"
#include "file.h"
#include "data.h"
#include "lib/endianrw.h"
#include <zlib.h>
#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
#include <set>
using namespace std;
/**
* Enable pendantic checks on the zip integrity.
*/
bool zip::pedantic = false;
bool ecd_compare_sig(const unsigned char *buffer)
{
static char ecdsig[] = { 'P', 'K', 0x05, 0x06 };
return memcmp(buffer, ecdsig, 4) == 0;
}
/**
* Locate end-of-central-dir sig in buffer and return offset
* \param offset Resulting offset of cent dir start in buffer.
* \reutn If the end-of-central-dir is found.
*/
bool ecd_find_sig (const unsigned char *buffer, unsigned buflen, unsigned& offset)
{
for (int i=buflen-22; i>=0; i--) {
if (ecd_compare_sig(buffer+i)) {
offset = i;
return true;
}
}
return false;
}
#define ECD_READ_BUFFER_SIZE 4096
/**
* Read cent dir and end cent dir data
* \param f File to read.
* \param length Length of the file.
*/
bool cent_read(FILE* f, unsigned length, unsigned char*& data, unsigned& size)
{
unsigned buf_length;
if (length <= ECD_READ_BUFFER_SIZE) {
buf_length = length;
} else {
// align the read
buf_length = length - ((length - ECD_READ_BUFFER_SIZE) & ~(ECD_READ_BUFFER_SIZE-1));
}
while (true) {
if (buf_length > length)
buf_length = length;
if (fseek(f, length - buf_length, SEEK_SET) != 0) {
return false;
}
// allocate buffer
unsigned char* buf = data_alloc(buf_length);
assert(buf);
if (fread(buf, buf_length, 1, f) != 1) {
data_free(buf);
return false;
}
unsigned offset = 0;
if (ecd_find_sig(buf, buf_length, offset)) {
unsigned start_of_cent_dir = le_uint32_read(buf + offset + ZIP_EO_offset_to_start_of_cent_dir);
unsigned buf_pos = length - buf_length;
if (start_of_cent_dir >= length) {
data_free(buf);
return false;
}
size = length - start_of_cent_dir;
data = data_alloc(size);
assert(data);
if (buf_pos <= start_of_cent_dir) {
memcpy(data, buf + (start_of_cent_dir - buf_pos), size);
data_free(buf);
} else {
data_free(buf);
if (fseek(f, start_of_cent_dir, SEEK_SET) != 0) {
data_free(data);
data = 0;
return false;
}
if (fread(data, size, 1, f) != 1) {
data_free(data);
data = 0;
return false;
}
}
return true;
}
data_free(buf);
if (buf_length < 8 * ECD_READ_BUFFER_SIZE && buf_length < length) {
// grow buffer
buf_length += ECD_READ_BUFFER_SIZE;
} else {
// aborting
return false;
}
}
}
/** Code used for disk entry. */
#define ZIP_UNIQUE_DISK 0
/** Convert time_t to zip format. */
void time2zip(time_t tod, unsigned& date, unsigned& time)
{
struct tm* tm = gmtime(&tod);
assert(tm);
unsigned day = tm->tm_mday; // 1-31
unsigned mon = tm->tm_mon + 1; // 1-12
unsigned year = tm->tm_year - 80; // since 1980
date = (day & 0x1F) | ((mon & 0xF) << 5) | ((year & 0x7F) << 9);
unsigned sec = tm->tm_sec / 2; // 0-29, double to get real seconds
unsigned min = tm->tm_min; // 0-59
unsigned hour = tm->tm_hour; // 0-23
time = (sec & 0x1F) | ((min & 0x3F) << 5) | ((hour & 0x1F) << 11);
}
/** Convert zip time to to time_t. */
time_t zip2time(unsigned date, unsigned time)
{
struct tm tm;
// reset all entry
memset(&tm, 0, sizeof(tm));
// set know entry
tm.tm_mday = date & 0x1F; // 1-31
tm.tm_mon = ((date >> 5) & 0xF) - 1; // 0-11
tm.tm_year = ((date >> 9) & 0x7f) + 80; // since 1900
tm.tm_sec = (time & 0x1F) * 2; // 0-59
tm.tm_min = (time >> 5) & 0x3F; // 0-59
tm.tm_hour = (time >> 11) & 0x1F; // 0-23
return mktime(&tm);
}
zip_entry::zip_entry(const zip& Aparent)
{
memset(&info, 0xFF, sizeof(info));
parent_name = Aparent.file_get();
info.filename_length = 0;
file_name = 0;
info.local_extra_field_length = 0;
local_extra_field = 0;
info.central_extra_field_length = 0;
central_extra_field = 0;
info.file_comment_length = 0;
file_comment = 0;
info.compressed_size = 0;
data = 0;
}
zip_entry::zip_entry(const zip_entry& A)
{
info = A.info;
parent_name = A.parent_name;
file_name = data_dup(A.file_name, info.filename_length);
local_extra_field = data_dup(A.local_extra_field, info.local_extra_field_length);
central_extra_field = data_dup(A.central_extra_field, info.central_extra_field_length);
file_comment = data_dup(A.file_comment, info.file_comment_length);
data = data_dup(A.data, A.info.compressed_size);
}
zip_entry::~zip_entry()
{
data_free(file_name);
data_free(local_extra_field);
data_free(central_extra_field);
data_free(file_comment);
data_free(data);
}
zip_entry::method_t zip_entry::method_get() const
{
switch (info.compression_method) {
case ZIP_METHOD_STORE :
return store;
case ZIP_METHOD_SHRUNK :
return shrunk;
case ZIP_METHOD_REDUCE1 :
return reduce1;
case ZIP_METHOD_REDUCE2 :
return reduce2;
case ZIP_METHOD_REDUCE3 :
return reduce3;
case ZIP_METHOD_REDUCE4 :
return reduce4;
case ZIP_METHOD_IMPLODE :
switch (info.general_purpose_bit_flag & ZIP_GEN_FLAGS_IMPLODE_MASK) {
case ZIP_GEN_FLAGS_IMPLODE_4KD2T :
return implode_4kdict_2tree;
case ZIP_GEN_FLAGS_IMPLODE_8KD2T :
return implode_8kdict_2tree;
case ZIP_GEN_FLAGS_IMPLODE_4KD3T :
return implode_4kdict_3tree;
case ZIP_GEN_FLAGS_IMPLODE_8KD3T :
return implode_8kdict_3tree;
}
return unknown;
case ZIP_METHOD_DEFLATE :
switch (info.general_purpose_bit_flag & ZIP_GEN_FLAGS_DEFLATE_MASK) {
case ZIP_GEN_FLAGS_DEFLATE_NORMAL :
return deflate6;
case ZIP_GEN_FLAGS_DEFLATE_MAXIMUM :
return deflate9;
case ZIP_GEN_FLAGS_DEFLATE_FAST :
return deflate3;
case ZIP_GEN_FLAGS_DEFLATE_SUPERFAST :
return deflate1;
}
return unknown;
case ZIP_METHOD_BZIP2 :
return bzip2;
case ZIP_METHOD_LZMA :
return lzma;
}
return unknown;
}
bool zip_entry::is_text() const
{
return (info.internal_file_attrib & ZIP_INT_ATTR_TEXT) != 0;
}
void zip_entry::compressed_seek(FILE* f) const
{
// seek to local header
if (fseek(f, offset_get(), SEEK_SET) != 0) {
throw error_invalid() << "Failed seek " << parentname_get();
}
// read local header
unsigned char buf[ZIP_LO_FIXED];
if (fread(buf, ZIP_LO_FIXED, 1, f) != 1) {
throw error() << "Failed read " << parentname_get();
}
check_local(buf);
// use the local extra_field_length. It may be different than the
// central directory version in some zips.
unsigned local_extra_field_length = le_uint16_read(buf+ZIP_LO_extra_field_length);
// seek to data
if (fseek(f, info.filename_length + local_extra_field_length, SEEK_CUR) != 0) {
throw error_invalid() << "Failed seek " << parentname_get();
}
}
void zip_entry::compressed_read(unsigned char* outdata) const
{
if (data) {
memcpy(outdata, data, compressed_size_get());
} else {
FILE* f = fopen(parentname_get().c_str(), "rb");
if (!f) {
throw error() << "Failed open for reading " << parentname_get();
}
try {
compressed_seek(f);
if (compressed_size_get() > 0) {
if (fread(outdata, compressed_size_get(), 1, f) != 1) {
throw error() << "Failed read " << parentname_get();
}
}
} catch (...) {
fclose(f);
throw;
}
fclose(f);
}
}
time_t zip_entry::time_get() const
{
return zip2time(info.last_mod_file_date, info.last_mod_file_time);
}
void zip_entry::time_set(time_t tod)
{
time2zip(tod, info.last_mod_file_date, info.last_mod_file_time);
}
void zip_entry::set(method_t method, const string& Aname, const unsigned char* compdata, unsigned compsize, unsigned size, unsigned crc, unsigned date, unsigned time, bool is_text)
{
info.version_needed_to_extract = 20; // version 2.0
info.os_needed_to_extract = 0;
info.version_made_by = 20; // version 2.0
info.host_os = 0;
info.general_purpose_bit_flag = 0; // default
info.last_mod_file_date = date;
info.last_mod_file_time = time;
info.crc32 = crc;
info.compressed_size = compsize;
info.uncompressed_size = size;
info.internal_file_attrib = is_text ? ZIP_INT_ATTR_TEXT : 0;
info.external_file_attrib = 0;
switch (method) {
case store :
if (size != compsize) {
throw error_invalid() << "Zip entry size mismatch";
}
info.compression_method = ZIP_METHOD_STORE;
info.version_needed_to_extract = 10; // Version 1.0
break;
case shrunk :
info.compression_method = ZIP_METHOD_SHRUNK;
break;
case reduce1 :
info.compression_method = ZIP_METHOD_REDUCE1;
break;
case reduce2 :
info.compression_method = ZIP_METHOD_REDUCE2;
break;
case reduce3 :
info.compression_method = ZIP_METHOD_REDUCE3;
break;
case reduce4 :
info.compression_method = ZIP_METHOD_REDUCE4;
break;
case deflate1 :
case deflate2 :
info.compression_method = ZIP_METHOD_DEFLATE;
info.general_purpose_bit_flag |= ZIP_GEN_FLAGS_DEFLATE_SUPERFAST;
break;
case deflate3 :
case deflate4 :
case deflate5 :
info.compression_method = ZIP_METHOD_DEFLATE;
info.general_purpose_bit_flag |= ZIP_GEN_FLAGS_DEFLATE_FAST;
break;
case deflate6 :
case deflate7 :
case deflate8 :
info.compression_method = ZIP_METHOD_DEFLATE;
info.general_purpose_bit_flag |= ZIP_GEN_FLAGS_DEFLATE_NORMAL;
break;
case deflate9 :
info.compression_method = ZIP_METHOD_DEFLATE;
info.general_purpose_bit_flag |= ZIP_GEN_FLAGS_DEFLATE_MAXIMUM;
break;
case implode_4kdict_2tree :
info.compression_method = ZIP_METHOD_IMPLODE;
info.general_purpose_bit_flag |= ZIP_GEN_FLAGS_IMPLODE_4KD2T;
break;
case implode_8kdict_2tree :
info.compression_method = ZIP_METHOD_IMPLODE;
info.general_purpose_bit_flag |= ZIP_GEN_FLAGS_IMPLODE_8KD2T;
break;
case implode_4kdict_3tree :
info.compression_method = ZIP_METHOD_IMPLODE;
info.general_purpose_bit_flag |= ZIP_GEN_FLAGS_IMPLODE_4KD3T;
break;
case implode_8kdict_3tree :
info.compression_method = ZIP_METHOD_IMPLODE;
info.general_purpose_bit_flag |= ZIP_GEN_FLAGS_IMPLODE_8KD3T;
break;
case bzip2 :
info.compression_method = ZIP_METHOD_BZIP2;
break;
case lzma :
info.compression_method = ZIP_METHOD_LZMA;
break;
default :
throw error_invalid() << "Compression method not supported";
}
data_free(data);
info.compressed_size = compsize;
data = data_dup(compdata, info.compressed_size);
name_set(Aname);
data_free(local_extra_field);
info.local_extra_field_length = 0;
local_extra_field = 0;
data_free(central_extra_field);
info.central_extra_field_length = 0;
central_extra_field = 0;
data_free(file_comment);
info.file_comment_length = 0;
file_comment = 0;
}
void zip_entry::name_set(const string& Aname)
{
data_free(file_name);
info.filename_length = Aname.length();
file_name = data_alloc(info.filename_length);
memcpy(file_name, Aname.c_str(), info.filename_length);
}
string zip_entry::name_get() const
{
return string(file_name, file_name + info.filename_length);
}
/** Check central directory entry. */
void zip_entry::check_cent(const unsigned char* buf, unsigned buf_size) const
{
if (buf_size < ZIP_CO_FIXED) {
throw error_invalid() << "Invalid central directory data";
}
// check signature
if (le_uint32_read(buf+ZIP_CO_central_file_header_signature) != ZIP_C_signature) {
throw error_invalid() << "Invalid central directory signature";
}
// check filename_length > 0, can't exist a file without a name
if (le_uint16_read(buf+ZIP_CO_filename_length) == 0) {
throw error_invalid() << "Empty filename in central directory";
}
}
/** Check local file header comparing with internal information. */
void zip_entry::check_local(const unsigned char* buf) const
{
if (le_uint32_read(buf+ZIP_LO_local_file_header_signature) != ZIP_L_signature) {
throw error_invalid() << "Invalid signature in local header";
}
if (info.general_purpose_bit_flag != le_uint16_read(buf+ZIP_LO_general_purpose_bit_flag)) {
throw error_invalid() << "Invalid local purpose bit flag " << info.general_purpose_bit_flag << "/" << le_uint16_read(buf+ZIP_LO_general_purpose_bit_flag);
}
if (info.compression_method != le_uint16_read(buf+ZIP_LO_compression_method)) {
throw error_invalid() << "Invalid method on local header";
}
if ((le_uint16_read(buf+ZIP_LO_general_purpose_bit_flag) & ZIP_GEN_FLAGS_DEFLATE_ZERO) != 0) {
if (zip::pedantic) {
if (le_uint32_read(buf+ZIP_LO_crc32) != 0) {
throw error_invalid() << "Not zero crc on local header " << le_uint32_read(buf+ZIP_LO_crc32);
}
if (le_uint32_read(buf+ZIP_LO_compressed_size) != 0) {
throw error_invalid() << "Not zero compressed size in local header " << le_uint32_read(buf+ZIP_LO_compressed_size);
}
if (le_uint32_read(buf+ZIP_LO_uncompressed_size) != 0) {
throw error_invalid() << "Not zero uncompressed size in local header " << le_uint32_read(buf+ZIP_LO_uncompressed_size);
}
} else {
// allow the entries to have the correct value instead of 0
if (le_uint32_read(buf+ZIP_LO_crc32) != 0 && info.crc32 != le_uint32_read(buf+ZIP_LO_crc32)) {
throw error_invalid() << "Not zero crc on local header " << le_uint32_read(buf+ZIP_LO_crc32);
}
if (le_uint32_read(buf+ZIP_LO_compressed_size) != 0 && info.compressed_size != le_uint32_read(buf+ZIP_LO_compressed_size)) {
throw error_invalid() << "Not zero compressed size in local header " << le_uint32_read(buf+ZIP_LO_compressed_size);
}
if (le_uint32_read(buf+ZIP_LO_uncompressed_size) != 0 && info.uncompressed_size != le_uint32_read(buf+ZIP_LO_uncompressed_size)) {
throw error_invalid() << "Not zero uncompressed size in local header " << le_uint32_read(buf+ZIP_LO_uncompressed_size);
}
}
} else {
if (info.crc32 != le_uint32_read(buf+ZIP_LO_crc32)) {
throw error_invalid() << "Invalid crc on local header " << info.crc32 << "/" << le_uint32_read(buf+ZIP_LO_crc32);
}
if (info.compressed_size != le_uint32_read(buf+ZIP_LO_compressed_size)) {
throw error_invalid() << "Invalid compressed size in local header " << info.compressed_size << "/" << le_uint32_read(buf+ZIP_LO_compressed_size);
}
if (info.uncompressed_size != le_uint32_read(buf+ZIP_LO_uncompressed_size)) {
throw error_invalid() << "Invalid uncompressed size in local header " << info.uncompressed_size << "/" << le_uint32_read(buf+ZIP_LO_uncompressed_size);
}
}
if (info.filename_length != le_uint16_read(buf+ZIP_LO_filename_length)) {
throw error_invalid() << "Invalid filename in local header";
}
if (info.local_extra_field_length != le_uint16_read(buf+ZIP_LO_extra_field_length)
&& info.local_extra_field_length != 0 // the .zip generated with the info-zip program have the extra field only on the local header
) {
throw error_invalid() << "Invalid extra field length in local header " << info.local_extra_field_length << "/" << le_uint16_read(buf+ZIP_LO_extra_field_length);
}
}
void zip_entry::check_descriptor(const unsigned char* buf) const
{
if (0x08074b50 != le_uint32_read(buf+ZIP_DO_header_signature)) {
throw error_invalid() << "Invalid header signature on data descriptor " << le_uint32_read(buf+ZIP_DO_crc32);
}
if (info.crc32 != le_uint32_read(buf+ZIP_DO_crc32)) {
throw error_invalid() << "Invalid crc on data descriptor " << info.crc32 << "/" << le_uint32_read(buf+ZIP_DO_crc32);
}
if (info.compressed_size != le_uint32_read(buf+ZIP_DO_compressed_size)
// allow a 0 size, GNU unzip also allow it
&& 0 != le_uint32_read(buf+ZIP_DO_compressed_size)) {
throw error_invalid() << "Invalid compressed size in data descriptor " << info.compressed_size << "/" << le_uint32_read(buf+ZIP_DO_compressed_size);
}
if (info.uncompressed_size != le_uint32_read(buf+ZIP_DO_uncompressed_size)
// allow a 0 size, GNU unzip also allow it
&& 0 != le_uint32_read(buf+ZIP_DO_uncompressed_size)) {
throw error_invalid() << "Invalid uncompressed size in data descriptor " << info.uncompressed_size << "/" << le_uint32_read(buf+ZIP_DO_uncompressed_size);
}
}
/** Unload compressed/uncomressed data. */
void zip_entry::unload()
{
data_free(data);
data = 0;
}
/**
* Load local file header.
* \param buf Fixed size local header.
* \param f File seeked after the fixed size local header.
*/
void zip_entry::load_local(const unsigned char* buf, FILE* f, unsigned size)
{
check_local(buf);
// use the local extra_field_length. It may be different than the
// central directory version in some zips.
unsigned local_extra_field_length = le_uint16_read(buf+ZIP_LO_extra_field_length);
if (size < info.filename_length + local_extra_field_length) {
throw error_invalid() << "Overflow of filename";
}
size -= info.filename_length + local_extra_field_length;
// skip filename and extra field
if (fseek(f, info.filename_length + local_extra_field_length, SEEK_CUR) != 0) {
throw error_invalid() << "Failed seek";
}
data_free(data);
data = data_alloc(info.compressed_size);
if (size < info.compressed_size) {
throw error_invalid() << "Overflow of compressed data";
}
size -= info.compressed_size;
try {
if (info.compressed_size > 0) {
if (fread(data, info.compressed_size, 1, f) != 1) {
throw error() << "Failed read";
}
}
} catch (...) {
data_free(data);
data = 0;
throw;
}
// load the data descriptor
if ((le_uint16_read(buf+ZIP_LO_general_purpose_bit_flag) & ZIP_GEN_FLAGS_DEFLATE_ZERO) != 0) {
unsigned char data_desc[ZIP_DO_FIXED];
unsigned offset;
// handle the case of the ZIP_DO_header_signature missing
if (size == ZIP_DO_FIXED - 4) {
le_uint32_write(data_desc+ZIP_DO_header_signature, 0x08074b50);
offset = ZIP_DO_crc32;
} else {
offset = 0;
}
if (size < ZIP_DO_FIXED - offset) {
throw error_invalid() << "Overflow of data descriptor";
}
if (fread(data_desc + offset, ZIP_DO_FIXED - offset, 1, f) != 1) {
throw error() << "Failed read";
}
size -= ZIP_DO_FIXED - offset;
check_descriptor(data_desc);
}
}
/**
* Save local file header.
* \param f File seeked at correct position.
*/
void zip_entry::save_local(FILE* f)
{
long offset = ftell(f);
if (offset<0)
throw error() << "Failed tell";
info.relative_offset_of_local_header = offset;
// write header
unsigned char buf[ZIP_LO_FIXED];
le_uint32_write(buf+ZIP_LO_local_file_header_signature, ZIP_L_signature);
le_uint8_write(buf+ZIP_LO_version_needed_to_extract, info.version_needed_to_extract);
le_uint8_write(buf+ZIP_LO_os_needed_to_extract, info.os_needed_to_extract);
// clear the "data descriptor" bit
le_uint16_write(buf+ZIP_LO_general_purpose_bit_flag, info.general_purpose_bit_flag & ~ZIP_GEN_FLAGS_DEFLATE_ZERO);
le_uint16_write(buf+ZIP_LO_compression_method, info.compression_method);
le_uint16_write(buf+ZIP_LO_last_mod_file_time, info.last_mod_file_time);
le_uint16_write(buf+ZIP_LO_last_mod_file_date, info.last_mod_file_date);
le_uint32_write(buf+ZIP_LO_crc32, info.crc32);
le_uint32_write(buf+ZIP_LO_compressed_size, info.compressed_size);
le_uint32_write(buf+ZIP_LO_uncompressed_size, info.uncompressed_size);
le_uint16_write(buf+ZIP_LO_filename_length, info.filename_length);
le_uint16_write(buf+ZIP_LO_extra_field_length, info.local_extra_field_length);
if (fwrite(buf, ZIP_LO_FIXED, 1, f) != 1) {
throw error() << "Failed write";
}
// write filename
if (fwrite(file_name, info.filename_length, 1, f) != 1) {
throw error() << "Failed write";
}
// write the extra field
if (info.local_extra_field_length && fwrite(local_extra_field, info.local_extra_field_length, 1, f) != 1) {
throw error() << "Failed write";
}
// write data, directories don't have data
if (info.compressed_size) {
assert(data);
if (fwrite(data, info.compressed_size, 1, f) != 1) {
throw error() << "Failed write";
}
}
}
/**
* Load cent dir.
* \param buf Fixed size cent dir.
* \param f File seeked after the fixed size cent dir.
*/
void zip_entry::load_cent(const unsigned char* buf, unsigned buf_size, unsigned& skip)
{
const unsigned char* o_buf = buf;
check_cent(buf, buf_size);
// read header
info.version_made_by = le_uint8_read(buf+ZIP_CO_version_made_by);
info.host_os = le_uint8_read(buf+ZIP_CO_host_os);
info.version_needed_to_extract = le_uint8_read(buf+ZIP_CO_version_needed_to_extract);
info.os_needed_to_extract = le_uint8_read(buf+ZIP_CO_os_needed_to_extract);
info.general_purpose_bit_flag = le_uint16_read(buf+ZIP_CO_general_purpose_bit_flag);
info.compression_method = le_uint16_read(buf+ZIP_CO_compression_method);
info.last_mod_file_time = le_uint16_read(buf+ZIP_CO_last_mod_file_time);
info.last_mod_file_date = le_uint16_read(buf+ZIP_CO_last_mod_file_date);
info.crc32 = le_uint32_read(buf+ZIP_CO_crc32);
info.compressed_size = le_uint32_read(buf+ZIP_CO_compressed_size);
info.uncompressed_size = le_uint32_read(buf+ZIP_CO_uncompressed_size);
info.filename_length = le_uint16_read(buf+ZIP_CO_filename_length);
info.central_extra_field_length = le_uint16_read(buf+ZIP_CO_extra_field_length);
info.file_comment_length = le_uint16_read(buf+ZIP_CO_file_comment_length);
info.internal_file_attrib = le_uint16_read(buf+ZIP_CO_internal_file_attrib);
info.external_file_attrib = le_uint32_read(buf+ZIP_CO_external_file_attrib);
info.relative_offset_of_local_header = le_uint32_read(buf+ZIP_CO_relative_offset_of_local_header);
buf += ZIP_CO_FIXED;
if (buf_size < info.filename_length
|| buf_size < info.central_extra_field_length
|| buf_size < info.file_comment_length
|| buf_size < ZIP_CO_FIXED + info.filename_length + info.central_extra_field_length + info.file_comment_length
) {
throw error_invalid() << "Invalid central directory data";
}
// read filename
data_free(file_name);
file_name = data_alloc(info.filename_length);
memcpy(file_name, buf, info.filename_length);
buf += info.filename_length;
// read extra field
data_free(central_extra_field);
central_extra_field = data_dup(buf, info.central_extra_field_length);
buf += info.central_extra_field_length;
// read comment
data_free(file_comment);
file_comment = data_dup(buf, info.file_comment_length);
buf += info.file_comment_length;
skip = buf - o_buf;
}
/**
* Save cent dir.
* \param f File seeked at correct position.
*/
void zip_entry::save_cent(FILE* f)
{
unsigned char buf[ZIP_CO_FIXED];
le_uint32_write(buf+ZIP_CO_central_file_header_signature, ZIP_C_signature);
le_uint8_write(buf+ZIP_CO_version_made_by, info.version_made_by);
le_uint8_write(buf+ZIP_CO_host_os, info.host_os);
le_uint8_write(buf+ZIP_CO_version_needed_to_extract, info.version_needed_to_extract);
le_uint8_write(buf+ZIP_CO_os_needed_to_extract, info.os_needed_to_extract);
// clear the "data descriptor" bit
le_uint16_write(buf+ZIP_CO_general_purpose_bit_flag, info.general_purpose_bit_flag & ~ZIP_GEN_FLAGS_DEFLATE_ZERO);
le_uint16_write(buf+ZIP_CO_compression_method, info.compression_method);
le_uint16_write(buf+ZIP_CO_last_mod_file_time, info.last_mod_file_time);
le_uint16_write(buf+ZIP_CO_last_mod_file_date, info.last_mod_file_date);
le_uint32_write(buf+ZIP_CO_crc32, info.crc32);
le_uint32_write(buf+ZIP_CO_compressed_size, info.compressed_size);
le_uint32_write(buf+ZIP_CO_uncompressed_size, info.uncompressed_size);
le_uint16_write(buf+ZIP_CO_filename_length, info.filename_length);
le_uint16_write(buf+ZIP_CO_extra_field_length, info.central_extra_field_length);
le_uint16_write(buf+ZIP_CO_file_comment_length, info.file_comment_length);
le_uint16_write(buf+ZIP_CO_disk_number_start, ZIP_UNIQUE_DISK);
le_uint16_write(buf+ZIP_CO_internal_file_attrib, info.internal_file_attrib);
le_uint32_write(buf+ZIP_CO_external_file_attrib, info.external_file_attrib);
le_uint32_write(buf+ZIP_CO_relative_offset_of_local_header, info.relative_offset_of_local_header);
if (fwrite(buf, ZIP_CO_FIXED, 1, f) != 1) {
throw error() << "Failed write";
}
// write filename
if (fwrite(file_name, info.filename_length, 1, f) != 1) {
throw error() << "Failed write";
}
// write extra field
if (info.central_extra_field_length && fwrite(central_extra_field, info.central_extra_field_length, 1, f) != 1) {
throw error() << "Failed write";
}
// write comment
if (info.file_comment_length && fwrite(file_comment, info.file_comment_length, 1, f) != 1) {
throw error() << "Failed write";
}
}
zip::zip(const std::string& Apath) : path(Apath)
{
flag.open = false;
flag.read = false;
flag.modify = false;
zipfile_comment = 0;
}
zip::zip(const zip& A) : map(A.map), path(A.path)
{
flag = A.flag;
info = A.info;
zipfile_comment = data_dup(A.zipfile_comment, A.info.zipfile_comment_length);
}
zip::~zip()
{
if (is_open())
close();
}
void zip::create()
{
assert(!flag.open);
info.offset_to_start_of_cent_dir = 0;
info.zipfile_comment_length = 0;
data_free(zipfile_comment);
zipfile_comment = 0;
flag.read = true;
flag.open = true;
flag.modify = false;
}
void zip::open()
{
assert(!flag.open);
struct stat s;
if (stat(path.c_str(), &s) != 0) {
if (errno != ENOENT)
throw error() << "Failed stat";
// create the file if it's missing
create();
return;
}
unsigned length = s.st_size;
// open file
FILE* f = fopen(path.c_str(), "rb");
if (!f)
throw error() << "Failed open for reading";
unsigned char* data = 0;
unsigned data_size = 0;
try {
if (!cent_read(f, length, data, data_size))
throw error_invalid() << "Failed read end of central directory";
} catch (...) {
fclose(f);
throw;
}
fclose(f);
// position in data
unsigned data_pos = 0;
try {
// central dir
while (data_pos + 4 < data_size && le_uint32_read(data+data_pos) == ZIP_C_signature) {
iterator i = map.insert(map.end(), zip_entry(path));
unsigned skip = 0;
try {
i->load_cent(data + data_pos, data_size - data_pos, skip);
} catch (...) {
map.erase(i);
throw;
}
data_pos += skip;
}
if (data_pos+ZIP_EO_FIXED > data_size)
throw error_invalid() << "Truncated end of central dir";
// end of central dir
if (le_uint32_read(data+data_pos) != ZIP_E_signature)
throw error_invalid() << "Invalid end of central dir signature";
info.offset_to_start_of_cent_dir = le_uint32_read(data+data_pos+ZIP_EO_offset_to_start_of_cent_dir);
info.zipfile_comment_length = le_uint16_read(data+data_pos+ZIP_EO_zipfile_comment_length);
data_pos += ZIP_EO_FIXED;
if (info.offset_to_start_of_cent_dir != length - data_size)
throw error_invalid() << "Invalid end of central directory start address";
// comment
data_free(zipfile_comment);
if (data_pos+info.zipfile_comment_length > data_size)
throw error_invalid() << "Truncated end of central dir";
zipfile_comment = data_dup(data+data_pos, info.zipfile_comment_length);
data_pos += info.zipfile_comment_length;
} catch (...) {
data_free(data);
throw;
}
// delete cent data
data_free(data);
if (pedantic) {
// don't accept garbage at the end of file
if (data_pos != data_size)
throw error_invalid() << data_size - data_pos << " unused bytes at the end of the central directory";
}
flag.open = true;
flag.read = false;
flag.modify = false;
}
/**
* Close a zip file.
*/
void zip::close()
{
// deinizialize
flag.open = false;
flag.read = false;
flag.modify = false;
data_free(zipfile_comment);
zipfile_comment = 0;
path = "";
map.erase(map.begin(), map.end());
}
/**
* Discarge compressed data read.
* \note You cannot call unload() if zip is modified, you must call reopen().
*/
void zip::unload()
{
assert(flag.open && flag.read && !flag.modify);
for(iterator i=begin();i!=end();++i)
i->unload();
flag.read = false;
}
/**
* Reopen from zip on disk, lose any modify.
* \note Equivalent close and open.
*/
void zip::reopen()
{
assert(flag.open);
close();
open();
}
/**
* Load a zip file.
*/
void zip::load()
{
assert(flag.open && !flag.read);
flag.modify = false;
FILE* f = fopen(path.c_str(), "rb");
if (!f)
throw error() << "Failed open for reading";
try {
long offset = 0;
unsigned count = 0;
while (static_cast<unsigned long>(offset) < info.offset_to_start_of_cent_dir) {
unsigned char buf[ZIP_LO_FIXED];
// search the next item, assume entries in random order
iterator next;
bool next_set = false;
for(iterator i=begin();i!=end();++i) {
if (i->offset_get() >= static_cast<unsigned long>(offset)) {
if (!next_set || i->offset_get() < next->offset_get()) {
next_set = true;
next = i;
}
}
}
// if not found exit
if (!next_set) {
if (pedantic)
throw error_invalid() << info.offset_to_start_of_cent_dir - static_cast<unsigned long>(offset) << " unused bytes after the last local header at offset " << offset;
else
break;
}
// check for invalid start
if (next->offset_get() >= info.offset_to_start_of_cent_dir) {
throw error_invalid() << "Overflow in central directory";