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43 lines
860 B
C
43 lines
860 B
C
#include <stdint.h>
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#include <string.h>
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extern uint8_t *initrd_start;
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extern uint32_t initrd_size;
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char *getfile(uint32_t offset)
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{
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char *ptr = initrd_start;
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for (uint32_t i = 0; i < offset; i++) {
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uint32_t len = *((uint32_t *)ptr);
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uint32_t datalen = *((uint32_t *)(ptr + 4 + len));
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ptr += len + datalen + 8;
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if (ptr >= (char *)(initrd_start + initrd_size))
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return 0;
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}
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return ptr;
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}
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char *readfile(const char *name)
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{
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char *ptr;
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for (uint32_t i = 0; ptr = getfile(i), ptr != 0; i++) {
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uint32_t len = *((uint32_t *)ptr);
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if (!strncmp(name, ptr + 4, len))
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return ptr + len + 8;
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}
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return 0;
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}
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uint32_t filesize(const char *name)
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{
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char *ptr;
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for (uint32_t i = 0; ptr = getfile(i), ptr != 0; i++) {
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uint32_t len = *((uint32_t *)ptr);
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if (!strncmp(name, ptr + 4, len))
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return *((uint32_t *)ptr + len + 4);
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}
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return 0;
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}
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