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reading continued and/or encoded extended filenames now works; writing extended does, but we need to deal with encoding the non-ASCII ones

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IOSAD-218
Krista Bennett 5 years ago
parent deaf46dae9
commit 2c30a2a885
2 changed files with 100 additions and 50 deletions
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8
src/low-level/mime/mailmime.c
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@ -227,12 +227,10 @@ hex_to_byte(char* retval_byte, const char* hex_bytes) {
static void
byte_to_hex(char* upper_hex_value, char* lower_hex_value, char byte) {
if (!upper_hex_value || !lower_hex_value) {
*upper_hex_value = F;
*lower_hex_value = F;
*upper_hex_value = 'F';
*lower_hex_value = 'F';
return;
}
char upper = 0;
char lower = 0;
char lower_byte = byte & 0xF;
char upper_byte = byte >> 4;
*lower_hex_value = ((lower_byte < 10) ? ('0' + lower_byte) : 'A' + (lower_byte - 10));
@ -255,7 +253,7 @@ void mailmime_parm_value_escape(char** dst, const char* src) {
const int ESCAPED_ENCODING_PREFIX_LENGTH = 7;
size_t retval_len = ESCAPED_ENCODING_PREFIX_LENGTH + (number_of_octets * 3);
char* unbroken_string = calloc(retval_len + 1); // 8 = utf-8'' + \0
char* unbroken_string = calloc(retval_len + 1, 1); // 8 = utf-8'' + \0
strncpy(unbroken_string, ESCAPED_ENCODING_PREFIX, retval_len);
char* srcend = src + number_of_octets;

142
src/low-level/mime/mailmime_write_generic.c
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@ -439,13 +439,14 @@ break_filename(char** extended_filename, const char* filename_str,
clist* line_list = clist_new();
// We'll be adding a lot of ";\r\n" into the output, so we make an initial educated guess on size
size_t filename_key_len = (is encoded ? 11 : 10); // " filename*0*=" | " filename*0="
size_t filename_key_len = (is_encoded ? 11 : 10); // " filename*0*=" | " filename*0="
size_t addl_chars_len = (is_encoded ? 3 : 5); // ";\r\n" + 2 quotes
const char* equals_str = (is_encoded ? "*=" : "=\"");
const char* end_str = (is_encoded ? ";\r\n" : "\";\r\n")
const char* end_str = (is_encoded ? ";\r\n" : "\";\r\n");
size_t key_buffer_size = filename_key_len + 5; // This is ridiculous, because 1000+ -part filenames??? But ok.
int curr_line_count, curr_char_count;
int curr_line_count = 0;
int curr_char_count = 0;
const char* curr_src_ptr = filename_str;
const char* curr_src_end = filename_str + strlen(filename_str);
@ -453,24 +454,26 @@ break_filename(char** extended_filename, const char* filename_str,
size_t end_string_size = (is_encoded ? 3 : 4);
char curr_line_buf[80];
char* temp_octet_buffer[80];
snprintf(curr_line_buf, key_buffer_size, "\r\n");
clist_append(line_list, strdup(curr_line_buf));
for (curr_line_count = 0, curr_char_count = 0; curr_src_ptr > curr_end_ptr; curr_line_count++) {
for (curr_char_count = 2; curr_src_ptr < curr_src_end; curr_line_count++) {
// Start line.
if (curr_line_count > 9999)
return; // FIXME - free stuff
char* curr_line_ptr = curr_line_buf;
snprintf(curr_line_buff, key_buffer_size, " filename*%d%s", curr_line_count, equals_str);
size_t curr_key_len = strlen(curr_line_buff);
snprintf(curr_line_buf, key_buffer_size, " filename*%d%s", curr_line_count, equals_str);
size_t curr_key_len = strlen(curr_line_buf);
curr_line_ptr += curr_key_len;
curr_char_count += curr_key_len;
size_t max_remaining_line_chars = length - curr_key_len - addl_chars_len;
int i;
unsigned int i;
if (!encoded) {
for (i = 0; i < max_remaining_line_chars && curr_src_ptr > curr_end_ptr; i++) {
if (!is_encoded) {
for (i = 0; i < max_remaining_line_chars && curr_src_ptr < curr_src_end; i++) {
*curr_line_ptr++ = *curr_src_ptr++;
curr_char_count++;
}
@ -480,26 +483,41 @@ break_filename(char** extended_filename, const char* filename_str,
// UTF-8 characters run between one and four octets. Thus, we
// should always be safe copying the first max_remaining - 3 of them
// and then finding a break either there or in the next 3 chars.
size_t max_safe = max_remaining - 3;
for (i = 0; i < max_safe && curr_src_ptr > curr_end_ptr; i++) {
// Copy in the first max - 3 chars
size_t max_safe = max_remaining_line_chars - 3;
for (i = 0; i < max_safe && curr_src_ptr < curr_src_end; i++) {
*curr_line_ptr++ = *curr_src_ptr++;
curr_char_count++;
}
if (curr_src_ptr != end_ptr) {
if (curr_src_ptr != curr_src_end) {
// Check last copied char
char tester = *(curr_line_ptr - 1);
if (!is_breakable(tester)) {
for (i = 0; i < 3 && curr_src_ptr > curr_end_ptr; i++) {
tester = *curr_str_ptr++;
unsigned char tester = (unsigned char) *(curr_line_ptr - 1);
// Check to see if it's the start of a four-byte char
if (tester >= 0xF0) {
// Add the next three
for (i = 0; i < 3 && curr_src_ptr < curr_src_end; i++) {
tester = (unsigned char) *curr_src_ptr++;
*curr_line_ptr++ = tester;
curr_char_count++;
if (is_breakable(tester))
break;
}
}
else if (tester >= 0x80) { // Ok, it's either two or three, or we're in the middle
// Find a break in the next 3 characters.
for (i = 0; i < 2 && curr_src_ptr < curr_src_end; i++) {
tester = (unsigned char) *(curr_src_ptr); // this advances it one to where the src starts for analysis
// Is this byte the start of a new character?
if (tester < 0x7F || tester > 0xC0)
break;
// Nope, check the next
*curr_line_ptr++ = tester;
curr_src_ptr++;
curr_char_count++;
}
}
}
}
if (curr_src_ptr >= curr_end_ptr) {
if (curr_src_ptr >= curr_src_end) {
strcpy(curr_line_ptr, (is_encoded ? "\r\n" : "\"\r\n"));
curr_char_count += (is_encoded ? 2 : 3);
clist_append(line_list, strdup(curr_line_buf));
@ -512,9 +530,26 @@ break_filename(char** extended_filename, const char* filename_str,
}
}
*extended_filename = calloc(curr_char_count + 1, 1);
size_t fname_size = curr_char_count + 1;
*extended_filename = calloc(fname_size, 1);
clistiter* cur;
// int start = 1;
if (line_list) {
for(cur = clist_begin(line_list) ; cur != NULL ; cur = clist_next(cur)) {
// if (start) {
// strcpy(*extended_filename, ((char*)(cur->data)));
// start = 0;
// }
// else {
strcat(*extended_filename, ((char*)(cur->data)));
// }
free(cur->data);
cur->data = NULL;
}
}
clist_free(line_list);
}
static int
@ -527,31 +562,34 @@ mailmime_disposition_param_write_driver(int (* do_write)(void *, const char *, s
int has_extended_filename = 0;
int has_encoded_filename = 0;
char* extended_filename = NULL;
const char* filename_key = "filename=";
size_t filename_key_len = strlen(filename_key);
char* fname = param->pa_data.pa_filename;
const int _MIME_LINE_LENGTH = 72;
const int _QUOTES_PLUS_SPACE_LEN = 3;
size_t filename_strlen;
switch (param->pa_type) {
case MAILMIME_DISPOSITION_PARM_FILENAME:
char* fname = param->pa_data.pa_filename;
const int _MIME_LINE_LENGTH = 72;
const int _QUOTES_PLUS_SPACE_LEN = 3;
size_t filename_strlen = strlen(fname);
size_t filename_key_len = strlen("filename=");
filename_strlen = strlen(fname);
if (strstr(fname, "utf-8''") == fname) {
// we're in for some fun here...
has_encoded_filename = true;
has_encoded_filename = 1;
filename_key_len++;
}
if ((filename_strlen + filename_keylen + _QUOTES_PLUS_SPACE_LEN) > _MIME_LINE_LENGTH)
if ((filename_strlen + filename_key_len + _QUOTES_PLUS_SPACE_LEN) > _MIME_LINE_LENGTH)
has_extended_filename = 1;
size_t filename_strlen = strlen(fname);
if (!has_extended_filename) {
if (has_encoded_filename)
len = strlen("filename=") + strlen(fname);
else
len = strlen("filename*=") + strlen(fname);
if (has_encoded_filename) {
filename_key = "filename*=";
}
len = filename_key_len + strlen(fname);
}
else {
extended_filename = break_filename(&extended_filename, fname, _MIME_LINE_LENGTH);
// This one contains all of the
break_filename(&extended_filename, fname, _MIME_LINE_LENGTH, has_encoded_filename);
len = (extended_filename ? strlen(extended_filename) : 0);
}
break;
@ -581,8 +619,10 @@ mailmime_disposition_param_write_driver(int (* do_write)(void *, const char *, s
default:
return MAILIMF_ERROR_INVAL;
}
if (* col > 1) {
// KG: FIXME - this could cause us trouble
if (* col > 1 && !extended_filename) {
if (* col + len > MAX_MAIL_COL) {
r = mailimf_string_write_driver(do_write, data, col, "\r\n ", 3);
@ -596,14 +636,26 @@ mailmime_disposition_param_write_driver(int (* do_write)(void *, const char *, s
switch (param->pa_type) {
case MAILMIME_DISPOSITION_PARM_FILENAME:
r = mailimf_string_write_driver(do_write, data, col, "filename=", 9);
if (r != MAILIMF_NO_ERROR)
return r;
r = mailimf_quoted_string_write_driver(do_write, data, col,
param->pa_data.pa_filename, strlen(param->pa_data.pa_filename));
if (r != MAILIMF_NO_ERROR)
return r;
if (extended_filename) {
r = mailimf_string_write_driver(do_write, data, col,
extended_filename,
strlen(extended_filename));
if (r != MAILIMF_NO_ERROR)
return r;
free(extended_filename);
}
else {
r = mailimf_string_write_driver(do_write, data, col,
filename_key, filename_key_len);
if (r != MAILIMF_NO_ERROR)
return r;
r = mailimf_string_write_driver(do_write, data, col,
param->pa_data.pa_filename, strlen(param->pa_data.pa_filename));
if (r != MAILIMF_NO_ERROR)
return r;
}
// param->pa_data.pa_filename, strlen(param->pa_data.pa_filename));
// r = mailimf_quoted_string_write_driver(do_write, data, col,
break;
case MAILMIME_DISPOSITION_PARM_CREATION_DATE:

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