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290 lines (234 loc) · 6.82 KB
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/* mz_strm_mem.c -- Stream for memory access
Version 2.5.2, August 27, 2018
part of the MiniZip project
This interface is designed to access memory rather than files.
We do use a region of memory to put data in to and take it out of.
Based on Unzip ioapi.c version 0.22, May 19th, 2003
Copyright (C) 2010-2018 Nathan Moinvaziri
https://github.com/nmoinvaz/minizip
Copyright (C) 2003 Justin Fletcher
Copyright (C) 1998-2003 Gilles Vollant
http://www.winimage.com/zLibDll/minizip.html
This program is distributed under the terms of the same license as zlib.
See the accompanying LICENSE file for the full text of the license.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mz.h"
#include "mz_strm.h"
#include "mz_strm_mem.h"
/***************************************************************************/
static mz_stream_vtbl mz_stream_mem_vtbl = {
mz_stream_mem_open,
mz_stream_mem_is_open,
mz_stream_mem_read,
mz_stream_mem_write,
mz_stream_mem_tell,
mz_stream_mem_seek,
mz_stream_mem_close,
mz_stream_mem_error,
mz_stream_mem_create,
mz_stream_mem_delete,
NULL,
NULL
};
/***************************************************************************/
typedef struct mz_stream_mem_s {
mz_stream stream;
int32_t mode;
uint8_t *buffer; // Memory buffer pointer
int32_t size; // Size of the memory buffer
int32_t limit; // Furthest we've written
int32_t position; // Current position in the memory
int32_t grow_size; // Size to grow when full
} mz_stream_mem;
/***************************************************************************/
static void mz_stream_mem_set_size(void *stream, int32_t size)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
int32_t new_size = size;
uint8_t *new_buf = NULL;
new_buf = (uint8_t *)MZ_ALLOC(new_size);
if (mem->buffer)
{
memcpy(new_buf, mem->buffer, mem->size);
MZ_FREE(mem->buffer);
}
mem->buffer = new_buf;
mem->size = new_size;
}
int32_t mz_stream_mem_open(void *stream, const char *path, int32_t mode)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
MZ_UNUSED(path);
mem->mode = mode;
mem->limit = 0;
mem->position = 0;
if (mem->mode & MZ_OPEN_MODE_CREATE)
mz_stream_mem_set_size(stream, mem->grow_size);
else
mem->limit = mem->size;
return MZ_OK;
}
int32_t mz_stream_mem_is_open(void *stream)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
if (mem->buffer == NULL)
return MZ_STREAM_ERROR;
return MZ_OK;
}
int32_t mz_stream_mem_read(void *stream, void *buf, int32_t size)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
if (size > mem->size - mem->position)
size = mem->size - mem->position;
if (mem->position + size > mem->limit)
return 0;
memcpy(buf, mem->buffer + mem->position, size);
mem->position += size;
return size;
}
int32_t mz_stream_mem_write(void *stream, const void *buf, int32_t size)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
int32_t new_size = 0;
if (size == 0)
return size;
if (size > mem->size - mem->position)
{
if (mem->mode & MZ_OPEN_MODE_CREATE)
{
new_size = mem->size;
if (size < mem->grow_size)
new_size += mem->grow_size;
else
new_size += size;
mz_stream_mem_set_size(stream, new_size);
}
else
{
size = mem->size - mem->position;
}
}
memcpy(mem->buffer + mem->position, buf, size);
mem->position += size;
if (mem->position > mem->limit)
mem->limit = mem->position;
return size;
}
int64_t mz_stream_mem_tell(void *stream)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
return mem->position;
}
int32_t mz_stream_mem_seek(void *stream, int64_t offset, int32_t origin)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
int64_t new_pos = 0;
switch (origin)
{
case MZ_SEEK_CUR:
new_pos = mem->position + offset;
break;
case MZ_SEEK_END:
new_pos = mem->limit + offset;
break;
case MZ_SEEK_SET:
new_pos = offset;
break;
default:
return MZ_STREAM_ERROR;
}
if (new_pos > mem->size)
{
if ((mem->mode & MZ_OPEN_MODE_CREATE) == 0)
return MZ_STREAM_ERROR;
mz_stream_mem_set_size(stream, (int32_t)new_pos);
}
mem->position = (uint32_t)new_pos;
return MZ_OK;
}
int32_t mz_stream_mem_close(void *stream)
{
MZ_UNUSED(stream);
// We never return errors
return MZ_OK;
}
int32_t mz_stream_mem_error(void *stream)
{
MZ_UNUSED(stream);
// We never return errors
return MZ_OK;
}
void mz_stream_mem_set_buffer(void *stream, void *buf, int32_t size)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
mem->buffer = (uint8_t *)buf;
mem->size = size;
mem->limit = size;
}
int32_t mz_stream_mem_get_buffer(void *stream, const void **buf)
{
return mz_stream_mem_get_buffer_at(stream, 0, buf);
}
int32_t mz_stream_mem_get_buffer_at(void *stream, int64_t position, const void **buf)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
if (buf == NULL || position < 0 || mem->size < position || mem->buffer == NULL)
return MZ_STREAM_ERROR;
*buf = mem->buffer + position;
return MZ_OK;
}
int32_t mz_stream_mem_get_buffer_at_current(void *stream, const void **buf)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
return mz_stream_mem_get_buffer_at(stream, mem->position, buf);
}
void mz_stream_mem_get_buffer_length(void *stream, int32_t *length)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
*length = mem->limit;
}
void mz_stream_mem_set_buffer_limit(void *stream, int32_t limit)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
mem->limit = limit;
}
void mz_stream_mem_set_grow_size(void *stream, int32_t grow_size)
{
mz_stream_mem *mem = (mz_stream_mem *)stream;
mem->grow_size = grow_size;
}
void *mz_stream_mem_create(void **stream)
{
mz_stream_mem *mem = NULL;
mem = (mz_stream_mem *)MZ_ALLOC(sizeof(mz_stream_mem));
if (mem != NULL)
{
memset(mem, 0, sizeof(mz_stream_mem));
mem->stream.vtbl = &mz_stream_mem_vtbl;
mem->grow_size = 4096;
}
if (stream != NULL)
*stream = mem;
return mem;
}
void mz_stream_mem_delete(void **stream)
{
mz_stream_mem *mem = NULL;
if (stream == NULL)
return;
mem = (mz_stream_mem *)*stream;
if (mem != NULL)
{
if ((mem->mode & MZ_OPEN_MODE_CREATE) && (mem->buffer != NULL))
MZ_FREE(mem->buffer);
MZ_FREE(mem);
}
*stream = NULL;
}
void *mz_stream_mem_get_interface(void)
{
return (void *)&mz_stream_mem_vtbl;
}