| // Copyright 2022 The Wuffs Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "bzlib.h" |
| |
| const char* // |
| mimic_bzip2_decode(wuffs_base__io_buffer* dst, |
| wuffs_base__io_buffer* src, |
| uint32_t wuffs_initialize_flags, |
| uint64_t wlimit, |
| uint64_t rlimit) { |
| if (wuffs_base__io_buffer__writer_length(dst) > 0x7FFFFFFF) { |
| return "dst length is too large"; |
| } else if (wuffs_base__io_buffer__reader_length(src) > 0x7FFFFFFF) { |
| return "src length is too large"; |
| } else if ((wlimit < UINT64_MAX) || (rlimit < UINT64_MAX)) { |
| // Supporting this would probably mean using BZ2_bzDecompress instead of |
| // the simpler BZ2_bzBuffToBuffDecompress function. |
| return "unsupported I/O limit"; |
| } |
| unsigned int dlen = wuffs_base__io_buffer__writer_length(dst); |
| unsigned int slen = wuffs_base__io_buffer__reader_length(src); |
| int err = BZ2_bzBuffToBuffDecompress( |
| ((char*)wuffs_base__io_buffer__writer_pointer(dst)), &dlen, |
| ((char*)wuffs_base__io_buffer__reader_pointer(src)), slen, 0, 0); |
| if (err != BZ_OK) { |
| return "libbz2: an error occurred"; |
| } else if (dlen > wuffs_base__io_buffer__writer_length(dst)) { |
| return "libbz2: dst buffer overflow"; |
| } |
| dst->meta.wi += dlen; |
| return NULL; |
| } |