| // After editing this file, run "go generate" in the parent directory. |
| |
| // Copyright 2017 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. |
| |
| // ---------------- I/O |
| |
| struct wuffs_base__io_buffer__struct; |
| |
| typedef struct { |
| // Do not access the private_impl's fields directly. There is no API/ABI |
| // compatibility or safety guarantee if you do so. |
| struct { |
| struct wuffs_base__io_buffer__struct* buf; |
| // The bounds values are typically NULL, when created by the Wuffs public |
| // API. NULL means that the callee substitutes the implicit bounds derived |
| // from buf. |
| uint8_t* mark; |
| uint8_t* limit; |
| } private_impl; |
| } wuffs_base__io_reader; |
| |
| typedef struct { |
| // Do not access the private_impl's fields directly. There is no API/ABI |
| // compatibility or safety guarantee if you do so. |
| struct { |
| struct wuffs_base__io_buffer__struct* buf; |
| // The bounds values are typically NULL, when created by the Wuffs public |
| // API. NULL means that the callee substitutes the implicit bounds derived |
| // from buf. |
| uint8_t* mark; |
| uint8_t* limit; |
| } private_impl; |
| } wuffs_base__io_writer; |
| |
| // wuffs_base__io_buffer_meta is the metadata for a wuffs_base__io_buffer's |
| // data. |
| typedef struct { |
| size_t wi; // Write index. Invariant: wi <= len. |
| size_t ri; // Read index. Invariant: ri <= wi. |
| uint64_t pos; // Position of the buffer start relative to the stream start. |
| bool closed; // No further writes are expected. |
| } wuffs_base__io_buffer_meta; |
| |
| // wuffs_base__io_buffer is a 1-dimensional buffer (a pointer and length) plus |
| // additional metadata. |
| // |
| // A value with all fields zero is a valid, empty buffer. |
| typedef struct wuffs_base__io_buffer__struct { |
| wuffs_base__slice_u8 data; |
| wuffs_base__io_buffer_meta meta; |
| |
| #ifdef __cplusplus |
| inline void compact(); |
| inline wuffs_base__io_reader reader(); |
| inline wuffs_base__io_writer writer(); |
| inline uint64_t reader_available() const; |
| inline uint64_t reader_io_position() const; |
| inline uint64_t writer_available() const; |
| inline uint64_t writer_io_position() const; |
| #endif // __cplusplus |
| |
| } wuffs_base__io_buffer; |
| |
| static inline wuffs_base__io_buffer // |
| wuffs_base__make_io_buffer(wuffs_base__slice_u8 data, |
| wuffs_base__io_buffer_meta meta) { |
| wuffs_base__io_buffer ret; |
| ret.data = data; |
| ret.meta = meta; |
| return ret; |
| } |
| |
| static inline wuffs_base__io_buffer_meta // |
| wuffs_base__make_io_buffer_meta(size_t wi, |
| size_t ri, |
| uint64_t pos, |
| bool closed) { |
| wuffs_base__io_buffer_meta ret; |
| ret.wi = wi; |
| ret.ri = ri; |
| ret.pos = pos; |
| ret.closed = closed; |
| return ret; |
| } |
| |
| static inline wuffs_base__io_buffer // |
| wuffs_base__null_io_buffer() { |
| wuffs_base__io_buffer ret; |
| ret.data.ptr = NULL; |
| ret.data.len = 0; |
| ret.meta.wi = 0; |
| ret.meta.ri = 0; |
| ret.meta.pos = 0; |
| ret.meta.closed = false; |
| return ret; |
| } |
| |
| static inline wuffs_base__io_buffer_meta // |
| wuffs_base__null_io_buffer_meta() { |
| wuffs_base__io_buffer_meta ret; |
| ret.wi = 0; |
| ret.ri = 0; |
| ret.pos = 0; |
| ret.closed = false; |
| return ret; |
| } |
| |
| static inline wuffs_base__io_reader // |
| wuffs_base__null_io_reader() { |
| wuffs_base__io_reader ret; |
| ret.private_impl.buf = NULL; |
| ret.private_impl.mark = NULL; |
| ret.private_impl.limit = NULL; |
| return ret; |
| } |
| |
| static inline wuffs_base__io_writer // |
| wuffs_base__null_io_writer() { |
| wuffs_base__io_writer ret; |
| ret.private_impl.buf = NULL; |
| ret.private_impl.mark = NULL; |
| ret.private_impl.limit = NULL; |
| return ret; |
| } |
| |
| // wuffs_base__io_buffer__compact moves any written but unread bytes to the |
| // start of the buffer. |
| static inline void // |
| wuffs_base__io_buffer__compact(wuffs_base__io_buffer* buf) { |
| if (!buf || (buf->meta.ri == 0)) { |
| return; |
| } |
| buf->meta.pos = wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri); |
| size_t n = buf->meta.wi - buf->meta.ri; |
| if (n != 0) { |
| memmove(buf->data.ptr, buf->data.ptr + buf->meta.ri, n); |
| } |
| buf->meta.wi = n; |
| buf->meta.ri = 0; |
| } |
| |
| static inline wuffs_base__io_reader // |
| wuffs_base__io_buffer__reader(wuffs_base__io_buffer* buf) { |
| wuffs_base__io_reader ret; |
| ret.private_impl.buf = buf; |
| ret.private_impl.mark = NULL; |
| ret.private_impl.limit = NULL; |
| return ret; |
| } |
| |
| static inline wuffs_base__io_writer // |
| wuffs_base__io_buffer__writer(wuffs_base__io_buffer* buf) { |
| wuffs_base__io_writer ret; |
| ret.private_impl.buf = buf; |
| ret.private_impl.mark = NULL; |
| ret.private_impl.limit = NULL; |
| return ret; |
| } |
| |
| static inline uint64_t // |
| wuffs_base__io_buffer__reader_available(const wuffs_base__io_buffer* buf) { |
| return buf ? buf->meta.wi - buf->meta.ri : 0; |
| } |
| |
| static inline uint64_t // |
| wuffs_base__io_buffer__reader_io_position(const wuffs_base__io_buffer* buf) { |
| return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0; |
| } |
| |
| static inline uint64_t // |
| wuffs_base__io_buffer__writer_available(const wuffs_base__io_buffer* buf) { |
| return buf ? buf->data.len - buf->meta.wi : 0; |
| } |
| |
| static inline uint64_t // |
| wuffs_base__io_buffer__writer_io_position(const wuffs_base__io_buffer* buf) { |
| return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0; |
| } |
| |
| #ifdef __cplusplus |
| |
| inline void // |
| wuffs_base__io_buffer__struct::compact() { |
| wuffs_base__io_buffer__compact(this); |
| } |
| |
| inline wuffs_base__io_reader // |
| wuffs_base__io_buffer__struct::reader() { |
| return wuffs_base__io_buffer__reader(this); |
| } |
| |
| inline wuffs_base__io_writer // |
| wuffs_base__io_buffer__struct::writer() { |
| return wuffs_base__io_buffer__writer(this); |
| } |
| |
| inline uint64_t // |
| wuffs_base__io_buffer__struct::reader_available() const { |
| return wuffs_base__io_buffer__reader_available(this); |
| } |
| |
| inline uint64_t // |
| wuffs_base__io_buffer__struct::reader_io_position() const { |
| return wuffs_base__io_buffer__reader_io_position(this); |
| } |
| |
| inline uint64_t // |
| wuffs_base__io_buffer__struct::writer_available() const { |
| return wuffs_base__io_buffer__writer_available(this); |
| } |
| |
| inline uint64_t // |
| wuffs_base__io_buffer__struct::writer_io_position() const { |
| return wuffs_base__io_buffer__writer_io_position(this); |
| } |
| |
| #endif // __cplusplus |