73 lines
1.2 KiB
C
73 lines
1.2 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include "table.h"
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enum loader_status acpi_table_load(const char *path, struct acpi_table **out)
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{
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FILE *fp = fopen(path, "rb");
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if (!fp) {
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return LOADER_IOERR;
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}
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fseek(fp, 0, SEEK_END);
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size_t len = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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unsigned char *buf = malloc(len);
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if (!buf) {
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fclose(fp);
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return LOADER_NOMEM;
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}
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size_t r = fread(buf, 1, len, fp);
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if (r != len) {
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free(buf);
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fclose(fp);
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return LOADER_IOERR;
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}
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fclose(fp);
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size_t sum = 0;
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for (size_t i = 0; i < len; i++) {
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sum += buf[i];
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}
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if ((sum % 0x100) != 0) {
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free(buf);
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return LOADER_BADSUM;
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}
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struct acpi_table *table = (struct acpi_table *)buf;
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*out = table;
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return LOADER_OK;
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}
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void acpi_table_destroy(struct acpi_table *table)
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{
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free(table);
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}
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void acpi_table_get_payload(struct acpi_table *table, void **p, size_t *len)
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{
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*p = (unsigned char *)table + sizeof *table;
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*len = table->length;
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}
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#define STATUS_STRING(code) \
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case code: \
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return #code;
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const char *loader_status_string(enum loader_status status)
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{
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switch (status) {
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STATUS_STRING(LOADER_OK)
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STATUS_STRING(LOADER_IOERR)
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STATUS_STRING(LOADER_BADSUM)
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STATUS_STRING(LOADER_NOMEM)
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default:
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return "<unknown>";
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}
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}
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