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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 <errno.h>
#define MAX_BUFSIZE (1024*1024)
ChunkedEncoding::ChunkedEncoding() {
strbufSize = 4096;
strbuf = new char[strbufSize];
strbuf[0] = '\0';
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;
}
// Was all bytes in strbuf examined?
if(strbuf+strlen(strbuf) <= p) {
break;
}
}
if(strbuf+strlen(strbuf) <= p) {
// make strbuf NULL-string
strbuf[0] = '\0';
} else {
// copy string between [p, strbuf+strlen(strbuf)+1], +1 is for NULL
// character.
char* temp = new char[strbufSize];
memcpy(temp, p, strbuf+strlen(strbuf)-p+1);
delete [] strbuf;
strbuf = temp;
}
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(strlen(*pp) < (unsigned long int)chunkSize) {
wsize = strlen(*pp) <= (unsigned int)maxlen-len ? strlen(*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) {
if(strstr(*pp, "\r\n") == *pp) {
*pp += 2;
return 0;
} else if(strlen(*pp) < 2) {
return -1;
} else {
throw new DlAbortEx(EX_INVALID_CHUNK_SIZE);
}
}
// strbuf is NULL terminated string, and inlen is strlen(strbuf).
// therefore, strbuf[inlen] = '\0'
int ChunkedEncoding::readChunkSize(char** pp) {
// we read chunk-size from *pp
char* p = strstr(*pp, "\r\n");
// \r\n is not found. Return -1
if(p == NULL) {
return -1;
}
// We ignore chunk-extension
char* exsp = index(*pp, ';');
if(exsp == NULL) {
exsp = p;
}
// TODO check invalid characters in buffer
chunkSize = strtol(*pp, NULL, 16);
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) {
if(strlen(strbuf)+inlen >= (unsigned int)strbufSize) {
if(strlen(strbuf)+inlen+1 > MAX_BUFSIZE) {
throw new DlAbortEx(EX_TOO_LARGE_CHUNK, strlen(strbuf)+inlen+1);
}
strbufSize = strlen(strbuf)+inlen+1;
char* temp = new char[strbufSize];
memcpy(temp, strbuf, strlen(strbuf)+1);
delete [] strbuf;
strbuf = temp;
}
int origlen = strlen(strbuf);
memcpy(strbuf+origlen, inbuf, inlen);
strbuf[origlen+inlen] = '\0';
}
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