kamkow1
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62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
#include <desc.h>
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#include <filereader.h>
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#include <path_defs.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <system.h>
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int filereader_init (struct filereader* fw, const char* volume, const char* path) {
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memset (fw, 0, sizeof (*fw));
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strncpy (fw->volume, volume, VOLUME_MAX);
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strncpy (fw->path, path, PATH_MAX);
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int ret;
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struct desc desc;
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if ((ret = volume_open (fw->volume)) < 0)
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return -FR_VOLUME_OPEN_ERROR;
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if ((ret = describe (fw->path, &desc)) < 0) {
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volume_close ();
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return -FR_DESC_ERROR;
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}
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if (desc.type != FS_FILE)
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return -FR_NOT_FILE;
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fw->file_size = desc.size;
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fw->flags |= FR_OPEN;
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return FR_OK;
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}
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int filereader_fini (struct filereader* fw) {
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if ((fw->flags & FR_OPEN)) {
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volume_close ();
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fw->flags &= ~FR_OPEN;
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}
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return FR_OK;
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}
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int filereader_read (struct filereader* fw, uint8_t* buffer, size_t buffer_size) {
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if (!(fw->flags & FR_OPEN))
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return -FR_VOLUME_NOT_OPENED;
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int ret;
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if (buffer_size > 0) {
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if (!(fw->read_cursor + buffer_size <= fw->file_size))
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return -FR_CURSOR_OOB;
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if ((ret = read_file (fw->path, fw->read_cursor, buffer, buffer_size)) < 0)
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return -FR_READ_ERROR;
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fw->read_cursor += buffer_size;
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}
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return FR_OK;
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}
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