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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
* This Original Code has been modified by IBM Corporation. Modifications made
* by IBM described herein are Copyright (c) International Business Machines
* Corporation, 2000. Modifications to Mozilla code or documentation identified
* per MPL Section 3.3
*
* Date Modified by Description of modification
* 04/20/2000 IBM Corp. OS/2 VisualAge build.
*/
/*
* mimebuf.c - libmsg like buffer handling routines for libmime
*/
#include "prmem.h"
#include "plstr.h"
#include "prlog.h"
#include "msgCore.h"
#include "nsMimeStringResources.h"
extern "C" int mime_GrowBuffer(uint32_t desired_size, uint32_t element_size,
uint32_t quantum, char** buffer, int32_t* size) {
if ((uint32_t)*size <= desired_size) {
char* new_buf;
uint32_t increment = desired_size - *size;
if (increment < quantum) /* always grow by a minimum of N bytes */
increment = quantum;
new_buf =
(*buffer ? (char*)PR_Realloc(*buffer, (*size + increment) *
(element_size / sizeof(char)))
: (char*)PR_MALLOC((*size + increment) *
(element_size / sizeof(char))));
if (!new_buf) return MIME_OUT_OF_MEMORY;
*buffer = new_buf;
*size += increment;
}
return 0;
}
/* The opposite of mime_LineBuffer(): takes small buffers and packs them
up into bigger buffers before passing them along.
Pass in a desired_buffer_size 0 to tell it to flush (for example, in
in the very last call to this function.)
*/
extern "C" int mime_ReBuffer(const char* net_buffer, int32_t net_buffer_size,
uint32_t desired_buffer_size, char** bufferP,
int32_t* buffer_sizeP, uint32_t* buffer_fpP,
int32_t (*per_buffer_fn)(char* buffer,
uint32_t buffer_size,
void* closure),
void* closure) {
int status = 0;
if (desired_buffer_size >= (uint32_t)(*buffer_sizeP)) {
status = mime_GrowBuffer(desired_buffer_size, sizeof(char), 1024, bufferP,
buffer_sizeP);
if (status < 0) return status;
}
do {
int32_t size = *buffer_sizeP - *buffer_fpP;
if (size > net_buffer_size) size = net_buffer_size;
if (size > 0) {
memcpy((*bufferP) + (*buffer_fpP), net_buffer, size);
(*buffer_fpP) += size;
net_buffer += size;
net_buffer_size -= size;
}
if (*buffer_fpP > 0 && *buffer_fpP >= desired_buffer_size) {
status = (*per_buffer_fn)((*bufferP), (*buffer_fpP), closure);
*buffer_fpP = 0;
if (status < 0) return status;
}
} while (net_buffer_size > 0);
return 0;
}
static int convert_and_send_buffer(
char* buf, int length, bool convert_newlines_p,
int32_t (*per_line_fn)(char* line, uint32_t line_length, void* closure),
void* closure) {
/* Convert the line terminator to the native form.
*/
char* newline;
#if (MSG_LINEBREAK_LEN == 2)
/*
* This is a patch to support a mail DB corruption cause by earlier version
* that lead to a crash. What happened is that the line terminator is
* CR+NULL+LF. Therefore, we first process a line terminated by CR then a
* second line that contains only NULL+LF. We need to ignore this second line.
* See bug http://bugzilla.mozilla.org/show_bug.cgi?id=61412 for more
* information.
*/
if (length == 2 && buf[0] == 0x00 && buf[1] == '\n') return 0;
#endif
NS_ASSERTION(buf && length > 0, "1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
if (!buf || length <= 0) return -1;
newline = buf + length;
NS_ASSERTION(newline[-1] == '\r' || newline[-1] == '\n',
"1.1 <rhp@netscape.com> 19 Mar 1999 12:00");
if (newline[-1] != '\r' && newline[-1] != '\n') return -1;
if (!convert_newlines_p) {
}
#if (MSG_LINEBREAK_LEN == 1)
else if ((newline - buf) >= 2 && newline[-2] == '\r' && newline[-1] == '\n') {
/* CRLF -> CR or LF */
buf[length - 2] = MSG_LINEBREAK[0];
length--;
} else if (newline > buf + 1 && newline[-1] != MSG_LINEBREAK[0]) {
/* CR -> LF or LF -> CR */
buf[length - 1] = MSG_LINEBREAK[0];
}
#else
else if (((newline - buf) >= 2 && newline[-2] != '\r') ||
((newline - buf) >= 1 && newline[-1] != '\n')) {
/* LF -> CRLF or CR -> CRLF */
length++;
buf[length - 2] = MSG_LINEBREAK[0];
buf[length - 1] = MSG_LINEBREAK[1];
}
#endif
return (*per_line_fn)(buf, length, closure);
}
extern "C" int mime_LineBuffer(
const char* net_buffer, int32_t net_buffer_size, char** bufferP,
int32_t* buffer_sizeP, uint32_t* buffer_fpP, bool convert_newlines_p,
int32_t (*per_line_fn)(char* line, uint32_t line_length, void* closure),
void* closure) {
int status = 0;
if (*buffer_fpP > 0 && *bufferP && (*buffer_fpP < (uint32_t)*buffer_sizeP) &&
(*bufferP)[*buffer_fpP - 1] == '\r' && net_buffer_size > 0 &&
net_buffer[0] != '\n') {
/* The last buffer ended with a CR. The new buffer does not start
with a LF. This old buffer should be shipped out and discarded. */
if ((uint32_t)*buffer_sizeP <= *buffer_fpP) return -1;
status = convert_and_send_buffer(*bufferP, *buffer_fpP, convert_newlines_p,
per_line_fn, closure);
if (status < 0) return status;
*buffer_fpP = 0;
}
while (net_buffer_size > 0) {
const char* net_buffer_end = net_buffer + net_buffer_size;
const char* newline = 0;
const char* s;
for (s = net_buffer; s < net_buffer_end; s++) {
/* Move forward in the buffer until the first newline.
Stop when we see CRLF, CR, or LF, or the end of the buffer.
*But*, if we see a lone CR at the *very end* of the buffer,
treat this as if we had reached the end of the buffer without
seeing a line terminator. This is to catch the case of the
buffers splitting a CRLF pair, as in "FOO\r\nBAR\r" "\nBAZ\r\n".
*/
if (*s == '\r' || *s == '\n') {
newline = s;
if (newline[0] == '\r') {
if (s == net_buffer_end - 1) {
/* CR at end - wait for the next character. */
newline = 0;
break;
} else if (newline[1] == '\n')
/* CRLF seen; swallow both. */
newline++;
}
newline++;
break;
}
}
/* Ensure room in the net_buffer and append some or all of the current
chunk of data to it. */
{
const char* end = (newline ? newline : net_buffer_end);
uint32_t desired_size = (end - net_buffer) + (*buffer_fpP) + 1;
if (desired_size >= (uint32_t)(*buffer_sizeP)) {
status = mime_GrowBuffer(desired_size, sizeof(char), 1024, bufferP,
buffer_sizeP);
if (status < 0) return status;
}
memcpy((*bufferP) + (*buffer_fpP), net_buffer, (end - net_buffer));
(*buffer_fpP) += (end - net_buffer);
(*bufferP)[*buffer_fpP] = '\0';
}
/* Now *bufferP contains either a complete line, or as complete
a line as we have read so far.
If we have a line, process it, and then remove it from `*bufferP'.
Then go around the loop again, until we drain the incoming data.
*/
if (!newline) return 0;
status = convert_and_send_buffer(*bufferP, *buffer_fpP, convert_newlines_p,
per_line_fn, closure);
if (status < 0) return status;
net_buffer_size -= (newline - net_buffer);
net_buffer = newline;
(*buffer_fpP) = 0;
}
return 0;
}
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