v/vlib/compress/zlib/zlib.v

61 lines
1.7 KiB
V

module zlib
#flag -I @VEXEROOT/thirdparty/zip
#include "miniz.h"
pub const max_size = u64(1 << 31)
fn C.tdefl_compress_mem_to_heap(source_buf voidptr, source_buf_len usize, out_len &usize, flags int) voidptr
fn C.tinfl_decompress_mem_to_heap(source_buf voidptr, source_buf_len usize, out_len &usize, flags int) voidptr
// compresses an array of bytes using zlib and returns the compressed bytes in a new array
// Example: compressed := zlib.compress(b) ?
[manualfree]
pub fn compress(data []byte) ?[]byte {
if u64(data.len) > zlib.max_size {
return error('data too large ($data.len > $zlib.max_size)')
}
mut out_len := usize(0)
// flags = TDEFL_WRITE_ZLIB_HEADER (0x01000)
address := C.tdefl_compress_mem_to_heap(data.data, data.len, &out_len, 0x01000)
if address == 0 {
return error('compression failed')
}
if u64(out_len) > zlib.max_size {
return error('compressed data is too large ($out_len > $zlib.max_size)')
}
compressed := unsafe {
address.vbytes(int(out_len))
}
copy := compressed.clone()
unsafe {
free(address)
}
return copy
}
// decompresses an array of bytes using zlib and returns the decompressed bytes in a new array
// Example: decompressed := zlib.decompress(b) ?
[manualfree]
pub fn decompress(data []byte) ?[]byte {
mut out_len := usize(0)
// flags = TINFL_FLAG_PARSE_ZLIB_HEADER (0x1)
address := C.tinfl_decompress_mem_to_heap(data.data, data.len, &out_len, 0x1)
if address == 0 {
return error('decompression failed')
}
if u64(out_len) > zlib.max_size {
return error('decompressed data is too large ($out_len > $zlib.max_size)')
}
decompressed := unsafe {
address.vbytes(int(out_len))
}
copy := decompressed.clone()
unsafe {
free(address)
}
return copy
}