kamkow1
58c515e90a
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84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
#include <desc.h>
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#include <filewriter.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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#include <write_file.h>
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int filewriter_init (struct filewriter* fw, const char* volume, const char* path, uint32_t flags) {
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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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fw->flags = flags;
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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 -FW_VOLUME_OPEN_ERROR;
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if ((fw->flags & FW_CREATE_FILE)) {
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if ((ret = create_file (fw->path)) < 0) {
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volume_close ();
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return -FW_CREATE_FILE_ERROR;
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}
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}
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if ((ret = describe (fw->path, &desc)) < 0) {
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volume_close ();
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return -FW_DESC_ERROR;
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}
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if (desc.type != FS_FILE)
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return -FW_NOT_FILE;
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fw->file_size = desc.size;
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fw->flags |= FW_OPEN;
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if ((fw->flags & FW_APPEND))
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fw->write_cursor = desc.size;
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return FW_OK;
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}
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int filewriter_fini (struct filewriter* fw) {
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if ((fw->flags & FW_OPEN)) {
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volume_close ();
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fw->flags &= ~FW_OPEN;
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}
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return FW_OK;
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}
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int filewriter_write (struct filewriter* fw, uint8_t* buffer, size_t buffer_size) {
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if (!(fw->flags & FW_OPEN))
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return -FW_VOLUME_NOT_OPENED;
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struct desc desc;
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int ret;
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if ((fw->flags & FW_APPEND)) {
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if ((ret = describe (fw->path, &desc)) < 0)
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return -FW_DESC_ERROR;
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fw->file_size = desc.size;
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fw->write_cursor = fw->file_size;
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}
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if (buffer_size > 0) {
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if (!(fw->flags & FW_APPEND) && !(fw->write_cursor + buffer_size <= fw->file_size))
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return -FW_CURSOR_OOB;
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uint32_t flags = (fw->flags & FW_APPEND) ? WF_APPEND : 0;
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if ((ret = write_file (fw->path, fw->write_cursor, buffer, buffer_size, flags)) < 0)
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return -FW_WRITE_ERROR;
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fw->write_cursor += buffer_size;
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}
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return FW_OK;
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}
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