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dolphin/Externals/minizip/mz_strm_split.c

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/* mz_strm_split.c -- Stream for split files
part of the minizip-ng project
Copyright (C) 2010-2021 Nathan Moinvaziri
https://github.com/zlib-ng/minizip-ng
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 "mz.h"
#include "mz_os.h"
#include "mz_strm.h"
#include "mz_strm_split.h"
#include <stdio.h> /* snprintf */
#if defined(_MSC_VER) && (_MSC_VER < 1900)
# define snprintf _snprintf
#endif
/***************************************************************************/
#define MZ_ZIP_MAGIC_DISKHEADER (0x08074b50)
/***************************************************************************/
static mz_stream_vtbl mz_stream_split_vtbl = {
mz_stream_split_open,
mz_stream_split_is_open,
mz_stream_split_read,
mz_stream_split_write,
mz_stream_split_tell,
mz_stream_split_seek,
mz_stream_split_close,
mz_stream_split_error,
mz_stream_split_create,
mz_stream_split_delete,
mz_stream_split_get_prop_int64,
mz_stream_split_set_prop_int64
};
/***************************************************************************/
typedef struct mz_stream_split_s {
mz_stream stream;
int32_t is_open;
int64_t disk_size;
int64_t total_in;
int64_t total_in_disk;
int64_t total_out;
int64_t total_out_disk;
int32_t mode;
char *path_cd;
uint32_t path_cd_size;
char *path_disk;
uint32_t path_disk_size;
int32_t number_disk;
int32_t current_disk;
int64_t current_disk_size;
int32_t reached_end;
} mz_stream_split;
/***************************************************************************/
#if 0
# define mz_stream_split_print printf
#else
# define mz_stream_split_print(fmt,...)
#endif
/***************************************************************************/
static int32_t mz_stream_split_open_disk(void *stream, int32_t number_disk) {
mz_stream_split *split = (mz_stream_split *)stream;
uint32_t magic = 0;
int64_t position = 0;
int32_t i = 0;
int32_t err = MZ_OK;
int16_t disk_part = 0;
/* Check if we are reading or writing a disk part or the cd disk */
if (number_disk >= 0) {
if ((split->mode & MZ_OPEN_MODE_WRITE) == 0)
disk_part = MZ_OPEN_MODE_READ;
else if (split->disk_size > 0)
disk_part = MZ_OPEN_MODE_WRITE;
}
/* Construct disk path */
if (disk_part > 0) {
for (i = (int32_t)strlen(split->path_disk) - 1; i >= 0; i -= 1) {
if (split->path_disk[i] != '.')
continue;
snprintf(&split->path_disk[i], split->path_disk_size - (uint32_t)i,
".z%02" PRId32, number_disk + 1);
break;
}
} else {
strncpy(split->path_disk, split->path_cd, split->path_disk_size - 1);
split->path_disk[split->path_disk_size - 1] = 0;
}
mz_stream_split_print("Split - Goto disk - %s (disk %" PRId32 ")\n", split->path_disk, number_disk);
/* If disk part doesn't exist during reading then return MZ_EXIST_ERROR */
if (disk_part == MZ_OPEN_MODE_READ)
err = mz_os_file_exists(split->path_disk);
if (err == MZ_OK)
err = mz_stream_open(split->stream.base, split->path_disk, split->mode);
if (err == MZ_OK) {
split->total_in_disk = 0;
split->total_out_disk = 0;
split->current_disk = number_disk;
if (split->mode & MZ_OPEN_MODE_WRITE) {
if ((split->current_disk == 0) && (split->disk_size > 0)) {
err = mz_stream_write_uint32(split->stream.base, MZ_ZIP_MAGIC_DISKHEADER);
split->total_out_disk += 4;
split->total_out += split->total_out_disk;
}
} else if (split->mode & MZ_OPEN_MODE_READ) {
if (split->current_disk == 0) {
err = mz_stream_read_uint32(split->stream.base, &magic);
if (magic != MZ_ZIP_MAGIC_DISKHEADER)
err = MZ_FORMAT_ERROR;
}
}
}
if (err == MZ_OK) {
/* Get the size of the current disk we are on */
position = mz_stream_tell(split->stream.base);
mz_stream_seek(split->stream.base, 0, MZ_SEEK_END);
split->current_disk_size = mz_stream_tell(split->stream.base);
mz_stream_seek(split->stream.base, position, MZ_SEEK_SET);
split->is_open = 1;
}
return err;
}
static int32_t mz_stream_split_close_disk(void *stream) {
mz_stream_split *split = (mz_stream_split *)stream;
if (mz_stream_is_open(split->stream.base) != MZ_OK)
return MZ_OK;
mz_stream_split_print("Split - Close disk\n");
return mz_stream_close(split->stream.base);
}
static int32_t mz_stream_split_goto_disk(void *stream, int32_t number_disk) {
mz_stream_split *split = (mz_stream_split *)stream;
int32_t err = MZ_OK;
int32_t err_is_open = MZ_OK;
err_is_open = mz_stream_is_open(split->stream.base);
if ((split->disk_size == 0) && (split->mode & MZ_OPEN_MODE_WRITE)) {
if (err_is_open != MZ_OK)
err = mz_stream_split_open_disk(stream, number_disk);
} else if ((number_disk != split->current_disk) || (err_is_open != MZ_OK)) {
err = mz_stream_split_close_disk(stream);
if (err == MZ_OK) {
err = mz_stream_split_open_disk(stream, number_disk);
if (err == MZ_OK)
split->number_disk = number_disk;
}
}
return err;
}
int32_t mz_stream_split_open(void *stream, const char *path, int32_t mode) {
mz_stream_split *split = (mz_stream_split *)stream;
int32_t number_disk = 0;
split->mode = mode;
split->path_cd_size = (uint32_t)strlen(path) + 1;
split->path_cd = (char *)MZ_ALLOC(split->path_cd_size);
if (split->path_cd == NULL)
return MZ_MEM_ERROR;
strncpy(split->path_cd, path, split->path_cd_size - 1);
split->path_cd[split->path_cd_size - 1] = 0;
mz_stream_split_print("Split - Open - %s (disk %" PRId32 ")\n", split->path_cd, number_disk);
split->path_disk_size = (uint32_t)strlen(path) + 10;
split->path_disk = (char *)MZ_ALLOC(split->path_disk_size);
if (split->path_disk == NULL) {
MZ_FREE(split->path_cd);
return MZ_MEM_ERROR;
}
strncpy(split->path_disk, path, split->path_disk_size - 1);
split->path_disk[split->path_disk_size - 1] = 0;
if ((mode & MZ_OPEN_MODE_WRITE) && ((mode & MZ_OPEN_MODE_APPEND) == 0)) {
number_disk = 0;
split->current_disk = -1;
} else {
number_disk = -1;
split->current_disk = 0;
}
return mz_stream_split_goto_disk(stream, number_disk);
}
int32_t mz_stream_split_is_open(void *stream) {
mz_stream_split *split = (mz_stream_split *)stream;
if (split->is_open != 1)
return MZ_OPEN_ERROR;
return MZ_OK;
}
int32_t mz_stream_split_read(void *stream, void *buf, int32_t size) {
mz_stream_split *split = (mz_stream_split *)stream;
int32_t bytes_left = size;
int32_t read = 0;
int32_t err = MZ_OK;
uint8_t *buf_ptr = (uint8_t *)buf;
err = mz_stream_split_goto_disk(stream, split->number_disk);
if (err != MZ_OK)
return err;
while (bytes_left > 0) {
read = mz_stream_read(split->stream.base, buf_ptr, bytes_left);
mz_stream_split_print("Split - Read disk - %" PRId32 "\n", read);
if (read < 0)
return read;
if (read == 0) {
if (split->current_disk < 0) /* No more disks to goto */
break;
err = mz_stream_split_goto_disk(stream, split->current_disk + 1);
if (err == MZ_EXIST_ERROR) {
split->current_disk = -1;
break;
}
if (err != MZ_OK)
return err;
}
bytes_left -= read;
buf_ptr += read;
split->total_in += read;
split->total_in_disk += read;
}
return size - bytes_left;
}
int32_t mz_stream_split_write(void *stream, const void *buf, int32_t size) {
mz_stream_split *split = (mz_stream_split *)stream;
int64_t position = 0;
int32_t written = 0;
int32_t bytes_left = size;
int32_t bytes_to_write = 0;
int32_t bytes_avail = 0;
int32_t number_disk = -1;
int32_t err = MZ_OK;
const uint8_t *buf_ptr = (const uint8_t *)buf;
position = mz_stream_tell(split->stream.base);
while (bytes_left > 0) {
bytes_to_write = bytes_left;
if (split->disk_size > 0) {
if ((split->total_out_disk == split->disk_size && split->total_out > 0) ||
(split->number_disk == -1 && split->number_disk != split->current_disk)) {
if (split->number_disk != -1)
number_disk = split->current_disk + 1;
err = mz_stream_split_goto_disk(stream, number_disk);
if (err != MZ_OK)
return err;
}
if (split->number_disk != -1) {
bytes_avail = (int32_t)(split->disk_size - split->total_out_disk);
if (bytes_to_write > bytes_avail)
bytes_to_write = bytes_avail;
}
}
written = mz_stream_write(split->stream.base, buf_ptr, bytes_to_write);
if (written != bytes_to_write)
return MZ_WRITE_ERROR;
mz_stream_split_print("Split - Write disk - %" PRId32 "\n", written);
bytes_left -= written;
buf_ptr += written;
split->total_out += written;
split->total_out_disk += written;
if (position == split->current_disk_size) {
split->current_disk_size += written;
position = split->current_disk_size;
}
}
return size - bytes_left;
}
int64_t mz_stream_split_tell(void *stream) {
mz_stream_split *split = (mz_stream_split *)stream;
int32_t err = MZ_OK;
err = mz_stream_split_goto_disk(stream, split->number_disk);
if (err != MZ_OK)
return err;
return mz_stream_tell(split->stream.base);
}
int32_t mz_stream_split_seek(void *stream, int64_t offset, int32_t origin) {
mz_stream_split *split = (mz_stream_split *)stream;
int64_t disk_left = 0;
int64_t position = 0;
int32_t err = MZ_OK;
err = mz_stream_split_goto_disk(stream, split->number_disk);
if (err != MZ_OK)
return err;
mz_stream_split_print("Split - Seek disk - %" PRId64 " (origin %" PRId32 ")\n", offset, origin);
if ((origin == MZ_SEEK_CUR) && (split->number_disk != -1)) {
position = mz_stream_tell(split->stream.base);
disk_left = split->current_disk_size - position;
while (offset > disk_left) {
err = mz_stream_split_goto_disk(stream, split->current_disk + 1);
if (err != MZ_OK)
return err;
offset -= disk_left;
disk_left = split->current_disk_size;
}
}
return mz_stream_seek(split->stream.base, offset, origin);
}
int32_t mz_stream_split_close(void *stream) {
mz_stream_split *split = (mz_stream_split *)stream;
int32_t err = MZ_OK;
err = mz_stream_split_close_disk(stream);
split->is_open = 0;
return err;
}
int32_t mz_stream_split_error(void *stream) {
mz_stream_split *split = (mz_stream_split *)stream;
return mz_stream_error(split->stream.base);
}
int32_t mz_stream_split_get_prop_int64(void *stream, int32_t prop, int64_t *value) {
mz_stream_split *split = (mz_stream_split *)stream;
switch (prop) {
case MZ_STREAM_PROP_TOTAL_OUT:
*value = split->total_out;
break;
case MZ_STREAM_PROP_DISK_NUMBER:
*value = split->number_disk;
break;
case MZ_STREAM_PROP_DISK_SIZE:
*value = split->disk_size;
break;
default:
return MZ_EXIST_ERROR;
}
return MZ_OK;
}
int32_t mz_stream_split_set_prop_int64(void *stream, int32_t prop, int64_t value) {
mz_stream_split *split = (mz_stream_split *)stream;
switch (prop) {
case MZ_STREAM_PROP_DISK_NUMBER:
split->number_disk = (int32_t)value;
break;
case MZ_STREAM_PROP_DISK_SIZE:
split->disk_size = value;
break;
default:
return MZ_EXIST_ERROR;
}
return MZ_OK;
}
void *mz_stream_split_create(void **stream) {
mz_stream_split *split = NULL;
split = (mz_stream_split *)MZ_ALLOC(sizeof(mz_stream_split));
if (split != NULL) {
memset(split, 0, sizeof(mz_stream_split));
split->stream.vtbl = &mz_stream_split_vtbl;
}
if (stream != NULL)
*stream = split;
return split;
}
void mz_stream_split_delete(void **stream) {
mz_stream_split *split = NULL;
if (stream == NULL)
return;
split = (mz_stream_split *)*stream;
if (split != NULL) {
if (split->path_cd)
MZ_FREE(split->path_cd);
if (split->path_disk)
MZ_FREE(split->path_disk);
MZ_FREE(split);
}
*stream = NULL;
}
void *mz_stream_split_get_interface(void) {
return (void *)&mz_stream_split_vtbl;
}
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