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84 lines
2.8 KiB
84 lines
2.8 KiB
/* |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include "AP_Filesystem_backend.h" |
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#include <AP_Common/ExpandingString.h> |
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#include <AP_Param/AP_Param.h> |
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class AP_Filesystem_Param : public AP_Filesystem_Backend |
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{ |
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public: |
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// functions that closely match the equivalent posix calls |
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int open(const char *fname, int flags, bool allow_absolute_paths = false) override; |
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int close(int fd) override; |
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int32_t read(int fd, void *buf, uint32_t count) override; |
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int32_t lseek(int fd, int32_t offset, int whence) override; |
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int stat(const char *pathname, struct stat *stbuf) override; |
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int32_t write(int fd, const void *buf, uint32_t count) override; |
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private: |
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// we maintain two cursors per open file to minimise seeking |
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// when filling in gaps |
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static constexpr uint8_t num_cursors = 2; |
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// only allow up to 4 files at a time |
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static constexpr uint8_t max_open_file = 4; |
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// maximum size of one packed parameter and default value |
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static constexpr uint8_t max_pack_len = AP_MAX_NAME_SIZE + 2 + 4 + 4 + 3; |
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// Support both protocol versions |
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static constexpr uint16_t pmagic = 0x671b; |
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static constexpr uint16_t pmagic_with_default = 0x671c; |
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// header at front of the file |
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struct header { |
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uint16_t magic = pmagic; |
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uint16_t num_params; |
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uint16_t total_params; // for upload this is total file length |
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}; |
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struct cursor { |
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AP_Param::ParamToken token; |
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uint32_t token_ofs; |
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char last_name[AP_MAX_NAME_SIZE+1]; |
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uint8_t trailer_len; |
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uint8_t trailer[max_pack_len]; |
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uint16_t idx; |
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}; |
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struct rfile { |
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bool open; |
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bool with_defaults; |
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uint16_t read_size; |
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uint16_t start; |
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uint16_t count; |
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uint32_t file_ofs; |
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uint32_t file_size; |
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struct cursor *cursors; |
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ExpandingString *writebuf; // for upload |
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} file[max_open_file]; |
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bool token_seek(const struct rfile &r, const uint32_t data_ofs, struct cursor &c); |
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uint8_t pack_param(const struct rfile &r, struct cursor &c, uint8_t *buf); |
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bool check_file_name(const char *fname); |
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// finish uploading parameters |
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bool finish_upload(const rfile &r); |
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bool param_upload_parse(const rfile &r, bool &need_retry); |
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};
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