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/* <!-- copyright */
/*
* aria2 - a simple utility for downloading files faster
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* copyright --> */
#include "ChunkedEncoding.h"
#include "DlAbortEx.h"
#include "message.h"
#include <string.h>
#include <strings.h>
#include <errno.h>
#define MAX_BUFSIZE (1024*1024)
ChunkedEncoding::ChunkedEncoding() {
strbufSize = 4096;
strbuf = new char[strbufSize];
strbufTail = strbuf;
state = READ_SIZE;
chunkSize = 0;
}
ChunkedEncoding::~ChunkedEncoding() {
if(strbuf != NULL) {
delete [] strbuf;
}
}
void ChunkedEncoding::init() {
}
bool ChunkedEncoding::finished() {
return state == FINISH ? true : false;
}
void ChunkedEncoding::end() {}
void ChunkedEncoding::inflate(char* outbuf, int& outlen, const char* inbuf, int inlen) {
addBuffer(inbuf, inlen);
char* p = strbuf;
int clen = 0;
while(1) {
if(state == READ_SIZE) {
if(readChunkSize(&p) == 0) {
if(chunkSize == 0) {
state = FINISH;
} else {
state = READ_DATA;
}
} else {
// chunk size is not fully received.
break;
}
} else if(state == READ_DATA) {
if(readData(&p, outbuf, clen, outlen) == 0) {
state = READ_SIZE;
} else {
break;
}
} else {
break;
}
// all bytes in strbuf were examined?
if(strbufTail <= p) {
break;
}
}
if(strbufTail <= p) {
strbufTail = strbuf;
} else {
// copy string between [p, strbufTail]
int unreadSize = strbufTail-p;
char* temp = new char[strbufSize];
memcpy(temp, p, unreadSize);
delete [] strbuf;
strbuf = temp;
strbufTail = strbuf+unreadSize;
}
outlen = clen;
}
int ChunkedEncoding::readData(char** pp, char* buf, int& len, int maxlen) {
if(buf+len == buf+maxlen) {
return -1;
}
if(chunkSize == 0) {
return readDataEOL(pp);
}
int wsize;
if(strbufTail-*pp < chunkSize) {
wsize = strbufTail-*pp <= maxlen-len ? strbufTail-*pp : maxlen-len;
} else {
wsize = chunkSize <= maxlen-len ? chunkSize : maxlen-len;
}
memcpy(buf+len, *pp, wsize);
chunkSize -= wsize;
len += wsize;
*pp += wsize;
if(chunkSize == 0) {
return readDataEOL(pp);
} else {
return -1;
}
}
int ChunkedEncoding::readDataEOL(char** pp) {
char* np = (char*)memchr(*pp, '\n', strbufTail-*pp);
char* rp = (char*)memchr(*pp, '\r', strbufTail-*pp);
if(np != NULL && rp != NULL && np-rp == 1 && *pp == rp) {
*pp += 2;
return 0;
} else if(strbufTail-*pp < 2) {
return -1;
} else {
throw new DlAbortEx(EX_INVALID_CHUNK_SIZE);
}
}
int ChunkedEncoding::readChunkSize(char** pp) {
// we read chunk-size from *pp
char* p;
char* np = (char*)memchr(*pp, '\n', strbufTail-*pp);
char* rp = (char*)memchr(*pp, '\r', strbufTail-*pp);
if(np == NULL || rp == NULL || np-rp != 1) {
// \r\n is not found. Return -1
return -1;
}
p = rp;
// We ignore chunk-extension
char* exsp = (char*)memchr(*pp, ';', strbufTail-*pp);
if(exsp == NULL) {
exsp = p;
}
// TODO check invalid characters in buffer
char* temp = new char[exsp-*pp+1];
memcpy(temp, *pp, exsp-*pp);
temp[exsp-*pp] = '\0';
chunkSize = strtol(temp, NULL, 16);
delete [] temp;
if(chunkSize < 0) {
throw new DlAbortEx(EX_INVALID_CHUNK_SIZE);
} else if(errno == ERANGE && (chunkSize == LONG_MAX || chunkSize == LONG_MIN)) {
throw new DlAbortEx(strerror(errno));
}
*pp = p+2;
return 0;
}
void ChunkedEncoding::addBuffer(const char* inbuf, int inlen) {
int realbufSize = strbufTail-strbuf;
if(realbufSize+inlen >= strbufSize) {
if(realbufSize+inlen > MAX_BUFSIZE) {
throw new DlAbortEx(EX_TOO_LARGE_CHUNK, realbufSize+inlen);
}
strbufSize = realbufSize+inlen;
char* temp = new char[strbufSize];
memcpy(temp, strbuf, realbufSize);
delete [] strbuf;
strbuf = temp;
strbufTail = strbuf+realbufSize;
}
memcpy(strbufTail, inbuf, inlen);
strbufTail += inlen;
}
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