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path: root/src/eyetil.cc
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-rw-r--r--src/eyetil.cc29
1 files changed, 28 insertions, 1 deletions
diff --git a/src/eyetil.cc b/src/eyetil.cc
index 2fbd687..fe816a6 100644
--- a/src/eyetil.cc
+++ b/src/eyetil.cc
@@ -1,23 +1,24 @@
1#include <stdlib.h> 1#include <stdlib.h>
2#include <sys/stat.h> 2#include <sys/stat.h>
3#include <syslog.h> 3#include <syslog.h>
4#include <iostream> 4#include <iostream>
5#include <cassert> 5#include <cassert>
6#include <stdexcept> 6#include <stdexcept>
7#include <algorithm>
8#include <numeric>
7#include <openssl/md5.h> 9#include <openssl/md5.h>
8#include "eyetil.h" 10#include "eyetil.h"
9 11
10binary_t& binary_t::from_hex(const std::string& h) { 12binary_t& binary_t::from_hex(const std::string& h) {
11 /* TODO: algorithmize */
12 std::string::size_type hs = h.length(); 13 std::string::size_type hs = h.length();
13 if(hs&1) 14 if(hs&1)
14 throw std::runtime_error("odd number of characters in hexadecimal number"); 15 throw std::runtime_error("odd number of characters in hexadecimal number");
15 int rvs = hs>>1; 16 int rvs = hs>>1;
16 resize(rvs); 17 resize(rvs);
17 const unsigned char *hp = (const unsigned char*)h.data(); 18 const unsigned char *hp = (const unsigned char*)h.data();
18 iterator oi=begin(); 19 iterator oi=begin();
19 char t[3] = { 0,0,0 }; 20 char t[3] = { 0,0,0 };
20 for(int i=0;i<rvs;++i) { 21 for(int i=0;i<rvs;++i) {
21 t[0]=*(hp++); t[1]=*(hp++); 22 t[0]=*(hp++); t[1]=*(hp++);
22 *(oi++) = strtol(t,0,16); 23 *(oi++) = strtol(t,0,16);
23 } 24 }
@@ -108,12 +109,38 @@ bool tarchive_t::read_next_header() {
108 return archive_read_next_header(a,&e)==ARCHIVE_OK; 109 return archive_read_next_header(a,&e)==ARCHIVE_OK;
109} 110}
110 111
111std::string tarchive_t::entry_pathname() { 112std::string tarchive_t::entry_pathname() {
112 assert(a); assert(e); 113 assert(a); assert(e);
113 return archive_entry_pathname(e); 114 return archive_entry_pathname(e);
114} 115}
115 116
116bool tarchive_t::read_data_into_fd(int fd) { 117bool tarchive_t::read_data_into_fd(int fd) {
117 assert(a); 118 assert(a);
118 return archive_read_data_into_fd(a,fd)==ARCHIVE_OK; 119 return archive_read_data_into_fd(a,fd)==ARCHIVE_OK;
119} 120}
121
122#pragma pack(1)
123struct block512_t {
124 enum { words = 512 / sizeof(uint16_t) };
125 uint16_t data[words];
126
127 static uint16_t tcpcksum(block512_t& data) {
128 uint32_t sum = std::accumulate(data.data,data.data+words,0);
129 while(uint32_t hw = sum>>16) sum = (sum&0xffff)+hw;
130 return ~sum;
131 }
132
133};
134#pragma pack()
135
136binary_t integrity_digest(const void *ptr,size_t size,const std::string& ukey) {
137 binary_t key; key.from_hex(ukey);
138 std::vector<uint16_t> blksums; blksums.reserve(size/sizeof(block512_t));
139 block512_t *db = (block512_t*)ptr,
140 *de = db + size/sizeof(block512_t);
141 std::transform( db, de, std::back_inserter(blksums), block512_t::tcpcksum );
142 binary_t subject;
143 subject.from_data((void*)&(blksums.front()),blksums.size()*sizeof(uint16_t));
144 std::copy( key.begin(), key.end(), std::back_inserter(subject) );
145 return subject.md5();
146}