39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
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#include "crc32_calc.h"
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#include <littlefs/lfs_util.h>
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#define CRC_DATA_BUFFER_MAX_LEN 512
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uint32_t crc32_calc_buffer(uint32_t crc, const void* buffer, size_t size) {
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// TODO: consider removing dependency on LFS
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return ~lfs_crc(~crc, buffer, size);
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}
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uint32_t crc32_calc_file(File* file, const FileCrcProgressCb progress_cb, void* context) {
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furi_check(storage_file_is_open(file) && storage_file_seek(file, 0, true));
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uint32_t file_crc = 0;
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uint8_t* data_buffer = malloc(CRC_DATA_BUFFER_MAX_LEN);
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uint16_t data_buffer_valid_len;
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uint32_t file_size = storage_file_size(file);
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/* Feed file contents per sector into CRC calc */
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for(uint32_t fptr = 0; fptr < file_size;) {
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data_buffer_valid_len = storage_file_read(file, data_buffer, CRC_DATA_BUFFER_MAX_LEN);
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if(data_buffer_valid_len == 0) {
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break;
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}
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fptr += data_buffer_valid_len;
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if(progress_cb && (fptr % CRC_DATA_BUFFER_MAX_LEN == 0)) {
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progress_cb(fptr * 100 / file_size, context);
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}
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file_crc = crc32_calc_buffer(file_crc, data_buffer, data_buffer_valid_len);
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}
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free(data_buffer);
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return file_crc;
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}
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