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389 lines (322 loc) · 10.1 KB
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/* mz_strm_zlib.c -- Stream for zlib inflate/deflate
part of the minizip-ng project
Copyright (C) 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_strm.h"
#include "mz_strm_zlib.h"
#if !defined(ZLIB_COMPAT)
# include "zlib-ng.h"
#else
# include "zlib.h"
#endif
/***************************************************************************/
#if !defined(ZLIB_COMPAT)
# define ZLIB_PREFIX(x) zng_ ## x
typedef zng_stream zlib_stream;
#else
# define ZLIB_PREFIX(x) x
typedef z_stream zlib_stream;
#endif
#if !defined(DEF_MEM_LEVEL)
# if MAX_MEM_LEVEL >= 8
# define DEF_MEM_LEVEL 8
# else
# define DEF_MEM_LEVEL MAX_MEM_LEVEL
# endif
#endif
/***************************************************************************/
static mz_stream_vtbl mz_stream_zlib_vtbl = {
mz_stream_zlib_open,
mz_stream_zlib_is_open,
mz_stream_zlib_read,
mz_stream_zlib_write,
mz_stream_zlib_tell,
mz_stream_zlib_seek,
mz_stream_zlib_close,
mz_stream_zlib_error,
mz_stream_zlib_create,
mz_stream_zlib_delete,
mz_stream_zlib_get_prop_int64,
mz_stream_zlib_set_prop_int64
};
/***************************************************************************/
typedef struct mz_stream_zlib_s {
mz_stream stream;
zlib_stream zstream;
uint8_t buffer[INT16_MAX];
int32_t buffer_len;
int64_t total_in;
int64_t total_out;
int64_t max_total_in;
int8_t initialized;
int16_t level;
int32_t window_bits;
int32_t mode;
int32_t error;
} mz_stream_zlib;
/***************************************************************************/
int32_t mz_stream_zlib_open(void *stream, const char *path, int32_t mode) {
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
MZ_UNUSED(path);
zlib->zstream.data_type = Z_BINARY;
zlib->zstream.zalloc = Z_NULL;
zlib->zstream.zfree = Z_NULL;
zlib->zstream.opaque = Z_NULL;
zlib->zstream.total_in = 0;
zlib->zstream.total_out = 0;
zlib->total_in = 0;
zlib->total_out = 0;
if (mode & MZ_OPEN_MODE_WRITE) {
#ifdef MZ_ZIP_NO_COMPRESSION
return MZ_SUPPORT_ERROR;
#else
zlib->zstream.next_out = zlib->buffer;
zlib->zstream.avail_out = sizeof(zlib->buffer);
zlib->error = ZLIB_PREFIX(deflateInit2)(&zlib->zstream, (int8_t)zlib->level, Z_DEFLATED,
zlib->window_bits, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
#endif
} else if (mode & MZ_OPEN_MODE_READ) {
#ifdef MZ_ZIP_NO_DECOMPRESSION
return MZ_SUPPORT_ERROR;
#else
zlib->zstream.next_in = zlib->buffer;
zlib->zstream.avail_in = 0;
zlib->error = ZLIB_PREFIX(inflateInit2)(&zlib->zstream, zlib->window_bits);
#endif
}
if (zlib->error != Z_OK)
return MZ_OPEN_ERROR;
zlib->initialized = 1;
zlib->mode = mode;
return MZ_OK;
}
int32_t mz_stream_zlib_is_open(void *stream) {
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
if (zlib->initialized != 1)
return MZ_OPEN_ERROR;
return MZ_OK;
}
int32_t mz_stream_zlib_read(void *stream, void *buf, int32_t size) {
#ifdef MZ_ZIP_NO_DECOMPRESSION
MZ_UNUSED(stream);
MZ_UNUSED(buf);
MZ_UNUSED(size);
return MZ_SUPPORT_ERROR;
#else
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
uint64_t total_in_before = 0;
uint64_t total_in_after = 0;
uint64_t total_out_before = 0;
uint64_t total_out_after = 0;
uint32_t total_in = 0;
uint32_t total_out = 0;
uint32_t in_bytes = 0;
uint32_t out_bytes = 0;
int32_t bytes_to_read = sizeof(zlib->buffer);
int32_t read = 0;
int32_t err = Z_OK;
zlib->zstream.next_out = (Bytef *)buf;
zlib->zstream.avail_out = (uInt)size;
do {
if (zlib->zstream.avail_in == 0) {
if (zlib->max_total_in > 0) {
if ((int64_t)bytes_to_read > (zlib->max_total_in - zlib->total_in))
bytes_to_read = (int32_t)(zlib->max_total_in - zlib->total_in);
}
read = mz_stream_read(zlib->stream.base, zlib->buffer, bytes_to_read);
if (read < 0)
return read;
zlib->zstream.next_in = zlib->buffer;
zlib->zstream.avail_in = read;
}
total_in_before = zlib->zstream.avail_in;
total_out_before = zlib->zstream.total_out;
err = ZLIB_PREFIX(inflate)(&zlib->zstream, Z_SYNC_FLUSH);
if ((err >= Z_OK) && (zlib->zstream.msg)) {
zlib->error = Z_DATA_ERROR;
break;
}
total_in_after = zlib->zstream.avail_in;
total_out_after = zlib->zstream.total_out;
in_bytes = (uint32_t)(total_in_before - total_in_after);
out_bytes = (uint32_t)(total_out_after - total_out_before);
total_in += in_bytes;
total_out += out_bytes;
zlib->total_in += in_bytes;
zlib->total_out += out_bytes;
if (err == Z_STREAM_END)
break;
if (err != Z_OK) {
zlib->error = err;
break;
}
} while (zlib->zstream.avail_out > 0);
MZ_UNUSED(total_in);
if (zlib->error != 0) {
/* Zlib errors are compatible with MZ */
return zlib->error;
}
return total_out;
#endif
}
#ifndef MZ_ZIP_NO_COMPRESSION
static int32_t mz_stream_zlib_flush(void *stream) {
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
if (mz_stream_write(zlib->stream.base, zlib->buffer, zlib->buffer_len) != zlib->buffer_len)
return MZ_WRITE_ERROR;
return MZ_OK;
}
static int32_t mz_stream_zlib_deflate(void *stream, int flush) {
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
uint64_t total_out_before = 0;
uint64_t total_out_after = 0;
int32_t out_bytes = 0;
int32_t err = Z_OK;
do {
if (zlib->zstream.avail_out == 0) {
err = mz_stream_zlib_flush(zlib);
if (err != MZ_OK)
return err;
zlib->zstream.avail_out = sizeof(zlib->buffer);
zlib->zstream.next_out = zlib->buffer;
zlib->buffer_len = 0;
}
total_out_before = zlib->zstream.total_out;
err = ZLIB_PREFIX(deflate)(&zlib->zstream, flush);
total_out_after = zlib->zstream.total_out;
out_bytes = (uint32_t)(total_out_after - total_out_before);
zlib->buffer_len += out_bytes;
zlib->total_out += out_bytes;
if (err == Z_STREAM_END)
break;
if (err != Z_OK) {
zlib->error = err;
return MZ_DATA_ERROR;
}
} while ((zlib->zstream.avail_in > 0) || (flush == Z_FINISH && err == Z_OK));
return MZ_OK;
}
#endif
int32_t mz_stream_zlib_write(void *stream, const void *buf, int32_t size) {
#ifdef MZ_ZIP_NO_COMPRESSION
MZ_UNUSED(stream);
MZ_UNUSED(buf);
MZ_UNUSED(size);
return MZ_SUPPORT_ERROR;
#else
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
int32_t err = MZ_OK;
zlib->zstream.next_in = (Bytef *)(intptr_t)buf;
zlib->zstream.avail_in = (uInt)size;
err = mz_stream_zlib_deflate(stream, Z_NO_FLUSH);
if (err != MZ_OK) {
return err;
}
zlib->total_in += size;
return size;
#endif
}
int64_t mz_stream_zlib_tell(void *stream) {
MZ_UNUSED(stream);
return MZ_TELL_ERROR;
}
int32_t mz_stream_zlib_seek(void *stream, int64_t offset, int32_t origin) {
MZ_UNUSED(stream);
MZ_UNUSED(offset);
MZ_UNUSED(origin);
return MZ_SEEK_ERROR;
}
int32_t mz_stream_zlib_close(void *stream) {
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
if (zlib->mode & MZ_OPEN_MODE_WRITE) {
#ifdef MZ_ZIP_NO_COMPRESSION
return MZ_SUPPORT_ERROR;
#else
mz_stream_zlib_deflate(stream, Z_FINISH);
mz_stream_zlib_flush(stream);
ZLIB_PREFIX(deflateEnd)(&zlib->zstream);
#endif
} else if (zlib->mode & MZ_OPEN_MODE_READ) {
#ifdef MZ_ZIP_NO_DECOMPRESSION
return MZ_SUPPORT_ERROR;
#else
ZLIB_PREFIX(inflateEnd)(&zlib->zstream);
#endif
}
zlib->initialized = 0;
if (zlib->error != Z_OK)
return MZ_CLOSE_ERROR;
return MZ_OK;
}
int32_t mz_stream_zlib_error(void *stream) {
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
return zlib->error;
}
int32_t mz_stream_zlib_get_prop_int64(void *stream, int32_t prop, int64_t *value) {
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
switch (prop) {
case MZ_STREAM_PROP_TOTAL_IN:
*value = zlib->total_in;
break;
case MZ_STREAM_PROP_TOTAL_IN_MAX:
*value = zlib->max_total_in;
break;
case MZ_STREAM_PROP_TOTAL_OUT:
*value = zlib->total_out;
break;
case MZ_STREAM_PROP_HEADER_SIZE:
*value = 0;
break;
case MZ_STREAM_PROP_COMPRESS_WINDOW:
*value = zlib->window_bits;
break;
default:
return MZ_EXIST_ERROR;
}
return MZ_OK;
}
int32_t mz_stream_zlib_set_prop_int64(void *stream, int32_t prop, int64_t value) {
mz_stream_zlib *zlib = (mz_stream_zlib *)stream;
switch (prop) {
case MZ_STREAM_PROP_COMPRESS_LEVEL:
if (value == MZ_COMPRESS_LEVEL_DEFAULT)
zlib->level = Z_DEFAULT_COMPRESSION;
else
zlib->level = (int16_t)value;
break;
case MZ_STREAM_PROP_TOTAL_IN_MAX:
zlib->max_total_in = value;
break;
case MZ_STREAM_PROP_COMPRESS_WINDOW:
zlib->window_bits = (int32_t)value;
break;
default:
return MZ_EXIST_ERROR;
}
return MZ_OK;
}
void *mz_stream_zlib_create(void) {
mz_stream_zlib *zlib = zlib = (mz_stream_zlib *)calloc(1, sizeof(mz_stream_zlib));
if (zlib) {
zlib->stream.vtbl = &mz_stream_zlib_vtbl;
zlib->level = Z_DEFAULT_COMPRESSION;
zlib->window_bits = -MAX_WBITS;
}
return zlib;
}
void mz_stream_zlib_delete(void **stream) {
mz_stream_zlib *zlib = NULL;
if (!stream)
return;
zlib = (mz_stream_zlib *)*stream;
if (zlib)
free(zlib);
*stream = NULL;
}
void *mz_stream_zlib_get_interface(void) {
return (void *)&mz_stream_zlib_vtbl;
}