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293 lines
7.5 KiB
C
293 lines
7.5 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/* mimepbuf.c --- utilities for buffering a MIME part for later display.
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Created: Jamie Zawinski <jwz@netscape.com>, 24-Sep-96.
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*/
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#include "rosetta.h"
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#include "mimepbuf.h"
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#include "xp_file.h"
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/* See mimepbuf.h for a description of the mission of this file.
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Implementation:
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When asked to buffer an object, we first try to malloc() a buffer to
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hold the upcoming part. First we try to allocate a 50k buffer, and
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then back off by 5k until we are able to complete the allocation,
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or are unable to allocate anything.
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As data is handed to us, we store it in the memory buffer, until the
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size of the memory buffer is exceeded (including the case where no
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memory buffer was able to be allocated at all.)
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Once we've filled the memory buffer, we open a temp file on disk.
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Anything that is currently in the memory buffer is then flushed out
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to the disk file (and the memory buffer is discarded.) Subsequent
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data that is passed in is appended to the file.
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Thus only one of the memory buffer or the disk buffer ever exist at
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the same time; and small parts tend to live completely in memory
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while large parts tend to live on disk.
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When we are asked to read the data back out of the buffer, we call
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the provided read-function with either: the contents of the memory
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buffer; or blocks read from the disk file.
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*/
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extern int MK_UNABLE_TO_OPEN_TMP_FILE;
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#define TARGET_MEMORY_BUFFER_SIZE (1024 * 50) /* try for 50k mem buffer */
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#define TARGET_MEMORY_BUFFER_QUANTUM (1024 * 5) /* decrease in steps of 5k */
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#define DISK_BUFFER_SIZE (1024 * 10) /* read disk in 10k chunks */
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struct MimePartBufferData
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{
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char *part_buffer; /* Buffer used for part-lookahead. */
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int32 part_buffer_fp; /* Active length. */
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int32 part_buffer_size; /* How big it is. */
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char *file_buffer_name; /* The name of a temp file used when we
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run out of room in the part_buffer. */
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XP_File file_stream; /* A stream to it. */
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};
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MimePartBufferData *
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MimePartBufferCreate (void)
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{
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MimePartBufferData *data = XP_NEW(MimePartBufferData);
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if (!data) return 0;
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XP_MEMSET(data, 0, sizeof(*data));
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return data;
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}
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void
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MimePartBufferClose (MimePartBufferData *data)
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{
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XP_ASSERT(data);
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if (!data) return;
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if (data->file_stream)
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{
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XP_FileClose(data->file_stream);
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data->file_stream = 0;
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}
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}
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void
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MimePartBufferReset (MimePartBufferData *data)
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{
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XP_ASSERT(data);
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if (!data) return;
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FREEIF(data->part_buffer);
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data->part_buffer_fp = 0;
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if (data->file_stream)
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{
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XP_FileClose(data->file_stream);
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data->file_stream = 0;
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}
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if (data->file_buffer_name)
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{
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XP_FileRemove(data->file_buffer_name, xpTemporary);
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XP_FREE(data->file_buffer_name);
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data->file_buffer_name = 0;
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}
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}
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void
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MimePartBufferDestroy (MimePartBufferData *data)
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{
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XP_ASSERT(data);
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if (!data) return;
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MimePartBufferReset (data);
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XP_FREE(data);
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}
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int
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MimePartBufferWrite (MimePartBufferData *data,
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const char *buf, int32 size)
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{
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int status = 0;
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XP_ASSERT(data && buf && size > 0);
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if (!data || !buf || size <= 0)
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return -1;
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/* If we don't yet have a buffer (either memory or file) try and make a
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memory buffer.
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*/
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if (!data->part_buffer &&
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!data->file_buffer_name)
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{
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int target_size = TARGET_MEMORY_BUFFER_SIZE;
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while (target_size > 0)
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{
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data->part_buffer = (char *) XP_ALLOC(target_size);
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if (data->part_buffer) break; /* got it! */
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target_size -= TARGET_MEMORY_BUFFER_QUANTUM; /* decrease it and try
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again */
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}
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if (data->part_buffer)
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data->part_buffer_size = target_size;
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else
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data->part_buffer_size = 0;
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data->part_buffer_fp = 0;
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}
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/* Ok, if at this point we still don't have either kind of buffer, try and
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make a file buffer. */
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if (!data->part_buffer &&
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!data->file_buffer_name)
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{
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data->file_buffer_name = WH_TempName(xpTemporary, "nsma");
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if (!data->file_buffer_name) return MK_OUT_OF_MEMORY;
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data->file_stream = XP_FileOpen(data->file_buffer_name, xpTemporary,
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XP_FILE_WRITE_BIN);
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if (!data->file_stream)
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return MK_UNABLE_TO_OPEN_TMP_FILE;
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}
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XP_ASSERT(data->part_buffer || data->file_stream);
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/* If this buf will fit in the memory buffer, put it there.
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*/
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if (data->part_buffer &&
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data->part_buffer_fp + size < data->part_buffer_size)
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{
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XP_MEMCPY(data->part_buffer + data->part_buffer_fp,
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buf, size);
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data->part_buffer_fp += size;
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}
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/* Otherwise it won't fit; write it to the file instead. */
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else
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{
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/* If the file isn't open yet, open it, and dump the memory buffer
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to it. */
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if (!data->file_stream)
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{
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if (!data->file_buffer_name)
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data->file_buffer_name =
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WH_TempName (xpTemporary, "nsma");
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if (!data->file_buffer_name) return MK_OUT_OF_MEMORY;
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data->file_stream = XP_FileOpen(data->file_buffer_name, xpTemporary,
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XP_FILE_WRITE_BIN);
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if (!data->file_stream)
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return MK_UNABLE_TO_OPEN_TMP_FILE;
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if (data->part_buffer && data->part_buffer_fp)
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{
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status = XP_FileWrite (data->part_buffer,
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data->part_buffer_fp,
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data->file_stream);
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if (status < 0) return status;
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}
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FREEIF(data->part_buffer);
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data->part_buffer_fp = 0;
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data->part_buffer_size = 0;
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}
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/* Dump this buf to the file. */
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status = XP_FileWrite (buf, size, data->file_stream);
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if (status < 0) return status;
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}
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return 0;
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}
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int
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MimePartBufferRead (MimePartBufferData *data,
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int (*read_fn) (char *buf, int32 size, void *closure),
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void *closure)
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{
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int status = 0;
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XP_ASSERT(data);
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if (!data) return -1;
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if (data->part_buffer)
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{
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/* Read it out of memory.
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*/
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XP_ASSERT(!data->file_buffer_name && !data->file_stream);
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status = read_fn(data->part_buffer, data->part_buffer_fp, closure);
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}
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else if (data->file_buffer_name)
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{
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/* Read it off disk.
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*/
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char *buf;
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int32 buf_size = DISK_BUFFER_SIZE;
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XP_ASSERT(data->part_buffer_size == 0 && data->part_buffer_fp == 0);
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XP_ASSERT(!data->file_stream);
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XP_ASSERT(data->file_buffer_name);
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if (!data->file_buffer_name) return -1;
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buf = (char *) XP_ALLOC(buf_size);
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if (!buf) return MK_OUT_OF_MEMORY;
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if (data->file_stream)
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XP_FileClose(data->file_stream);
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data->file_stream = XP_FileOpen(data->file_buffer_name, xpTemporary,
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XP_FILE_READ_BIN);
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if (!data->file_stream)
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{
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XP_FREE(buf);
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return MK_UNABLE_TO_OPEN_TMP_FILE;
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}
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while(1)
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{
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int32 rstatus = XP_FileRead(buf, buf_size - 1, data->file_stream);
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if (rstatus <= 0)
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{
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status = rstatus;
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break;
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}
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else
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{
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/* It would be really nice to be able to yield here, and let
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some user events and other input sources get processed.
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Oh well. */
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status = read_fn (buf, rstatus, closure);
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if (status < 0) break;
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}
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}
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XP_FREE(buf);
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}
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return 0;
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}
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