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#include "MCDataDecoderUtils.h"
#include <libetpan/libetpan.h>
#include <string.h>
#include <strings.h>
namespace mailcore {
static size_t uudecode(const char * text, size_t size, char * dst, size_t dst_buf_size)
{
unsigned int count = 0;
const char *b = text; /* beg */
const char *s = b; /* src */
const char *e = b+size; /* end */
char *d = dst;
int out = (*s++ & 0x7f) - 0x20;
/* don't process lines without leading count character */
if (out < 0)
return size;
/* dummy check. user must allocate buffer with appropriate length */
if (dst_buf_size < out)
return size;
/* don't process begin and end lines */
if ((strncasecmp((const char *)b, "begin ", 6) == 0) ||
(strncasecmp((const char *)b, "end", 3) == 0))
return size;
while (s < e && count < out)
{
int v = 0;
int i;
for (i = 0; i < 4; i += 1) {
char c = *s++;
v = v << 6 | ((c - 0x20) & 0x3F);
}
for (i = 2; i >= 0; i -= 1) {
char c = (char) (v & 0xFF);
d[i] = c;
v = v >> 8;
}
d += 3;
count += 3;
}
return count;
}
static void decodedPartDeallocator(char * decoded, unsigned int decoded_length) {
mailmime_decoded_part_free(decoded);
}
Data * MCDecodeData(Data * encodedData, Encoding encoding, bool partialContent, Data ** pRemainingData)
{
const char * text;
size_t text_length;
text = encodedData->bytes();
text_length = encodedData->length();
* pRemainingData = NULL;
switch (encoding) {
case Encoding7Bit:
case Encoding8Bit:
case EncodingBinary:
case EncodingOther:
default:
{
return encodedData;
}
case EncodingBase64:
case EncodingQuotedPrintable:
{
char * decoded;
size_t decoded_length;
size_t cur_token;
int mime_encoding;
switch (encoding) {
default: //disable warning
case EncodingBase64:
mime_encoding = MAILMIME_MECHANISM_BASE64;
break;
case EncodingQuotedPrintable:
mime_encoding = MAILMIME_MECHANISM_QUOTED_PRINTABLE;
break;
}
cur_token = 0;
if (partialContent) {
mailmime_part_parse_partial(text, text_length, &cur_token,
mime_encoding, &decoded, &decoded_length);
}
else {
mailmime_part_parse(text, text_length, &cur_token,
mime_encoding, &decoded, &decoded_length);
}
if (cur_token < text_length) {
* pRemainingData = Data::dataWithBytes(text + cur_token, (unsigned int)(text_length - cur_token));
}
Data * data = Data::data();
data->takeBytesOwnership(decoded, (unsigned int) decoded_length, decodedPartDeallocator);
return data;
}
case EncodingUUEncode:
{
Data * data;
const char * current_p;
data = Data::dataWithCapacity((unsigned int) text_length);
current_p = text;
while (1) {
/* In uuencoded files each data line usually have 45 bytes of decoded data.
Maximum possible length is limited by (0x7f-0x20) bytes.
So 256-bytes buffer is enough. */
char decoded_buf[256];
size_t decoded_length;
size_t length;
const char * p;
const char * p1;
const char * p2;
const char * end_line;
p1 = strchr(current_p, '\n');
p2 = strchr(current_p, '\r');
if (p1 == NULL) {
p = p2;
}
else if (p2 == NULL) {
p = p1;
}
else {
if (p1 - current_p < p2 - current_p) {
p = p1;
}
else {
p = p2;
}
}
end_line = p;
if (partialContent && (p1 == NULL || p2 == NULL) &&
((end_line == NULL) || (end_line - text) == (text_length - 1))) {
// possibly partial content detected
* pRemainingData = Data::dataWithBytes(current_p, (unsigned int)(text_length - (current_p - text)));
break;
}
if (p != NULL) {
while ((size_t) (p - text) < text_length) {
if ((* p != '\r') && (* p != '\n')) {
break;
}
p ++;
}
}
if (p == NULL) {
length = text_length - (current_p - text);
}
else {
length = end_line - current_p;
}
if (length == 0) {
break;
}
decoded_length = uudecode(current_p, length, decoded_buf, sizeof(decoded_buf));
if (decoded_length != 0 && decoded_length < length) {
data->appendBytes(decoded_buf, (unsigned int) decoded_length);
}
if (p == NULL)
break;
current_p = p;
while ((size_t) (current_p - text) < text_length) {
if ((* current_p != '\r') && (* current_p != '\n')) {
break;
}
current_p ++;
}
}
return data;
}
}
}
}
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