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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| #include "state.h" | ||
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| #include <string.h> | ||
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| /* state load/save */ | ||
| int state_load(const Logger *log, state_load_cb *state_load_callback, void *outer, | ||
| const uint8_t *data, uint32_t length, uint16_t cookie_inner) | ||
| { | ||
| if (state_load_callback == nullptr || data == nullptr) { | ||
| LOGGER_ERROR(log, "state_load() called with invalid args.\n"); | ||
| return -1; | ||
| } | ||
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| const uint32_t size_head = sizeof(uint32_t) * 2; | ||
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| while (length >= size_head) { | ||
| uint32_t length_sub; | ||
| lendian_to_host32(&length_sub, data); | ||
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| uint32_t cookie_type; | ||
| lendian_to_host32(&cookie_type, data + sizeof(uint32_t)); | ||
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| data += size_head; | ||
| length -= size_head; | ||
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| if (length < length_sub) { | ||
| /* file truncated */ | ||
| LOGGER_ERROR(log, "state file too short: %u < %u\n", length, length_sub); | ||
| return -1; | ||
| } | ||
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| if (lendian_to_host16((cookie_type >> 16)) != cookie_inner) { | ||
| /* something is not matching up in a bad way, give up */ | ||
| LOGGER_ERROR(log, "state file garbled: %04x != %04x\n", (cookie_type >> 16), cookie_inner); | ||
| return -1; | ||
| } | ||
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| const uint16_t type = lendian_to_host16(cookie_type & 0xFFFF); | ||
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| switch (state_load_callback(outer, data, length_sub, type)) { | ||
| case STATE_LOAD_STATUS_CONTINUE: | ||
| data += length_sub; | ||
| length -= length_sub; | ||
| break; | ||
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| case STATE_LOAD_STATUS_ERROR: | ||
| return -1; | ||
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| case STATE_LOAD_STATUS_END: | ||
| return 0; | ||
| } | ||
| } | ||
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| if (length != 0) { | ||
| LOGGER_ERROR(log, "unparsed data in state file of length %u\n", length); | ||
| return -1; | ||
| } | ||
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| return 0; | ||
| } | ||
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| uint16_t lendian_to_host16(uint16_t lendian) | ||
| { | ||
| #ifdef WORDS_BIGENDIAN | ||
| return (lendian << 8) | (lendian >> 8); | ||
| #else | ||
| return lendian; | ||
| #endif | ||
| } | ||
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| void host_to_lendian32(uint8_t *dest, uint32_t num) | ||
| { | ||
| #ifdef WORDS_BIGENDIAN | ||
| num = ((num << 8) & 0xFF00FF00) | ((num >> 8) & 0xFF00FF); | ||
| num = (num << 16) | (num >> 16); | ||
| #endif | ||
| memcpy(dest, &num, sizeof(uint32_t)); | ||
| } | ||
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| void lendian_to_host32(uint32_t *dest, const uint8_t *lendian) | ||
| { | ||
| uint32_t d; | ||
| memcpy(&d, lendian, sizeof(uint32_t)); | ||
| #ifdef WORDS_BIGENDIAN | ||
| d = ((d << 8) & 0xFF00FF00) | ((d >> 8) & 0xFF00FF); | ||
| d = (d << 16) | (d >> 16); | ||
| #endif | ||
| *dest = d; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| #ifndef C_TOXCORE_TOXCORE_STATE_H | ||
| #define C_TOXCORE_TOXCORE_STATE_H | ||
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| #include "logger.h" | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| // Returned by the state_load_cb to instruct the loader on what to do next. | ||
| typedef enum State_Load_Status { | ||
| // Continue loading state data sections. | ||
| STATE_LOAD_STATUS_CONTINUE, | ||
| // An error occurred. Stop loading sections. | ||
| STATE_LOAD_STATUS_ERROR, | ||
| // We're at the end of the save data, terminate loading successfully. | ||
| STATE_LOAD_STATUS_END, | ||
| } State_Load_Status; | ||
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| typedef State_Load_Status state_load_cb(void *outer, const uint8_t *data, uint32_t len, uint16_t type); | ||
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| // state load/save | ||
| int state_load(const Logger *log, state_load_cb *state_load_callback, void *outer, | ||
| const uint8_t *data, uint32_t length, uint16_t cookie_inner); | ||
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| // Utilities for state data serialisation. | ||
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| uint16_t lendian_to_host16(uint16_t lendian); | ||
| #define host_tolendian16(x) lendian_to_host16(x) | ||
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| void host_to_lendian32(uint8_t *dest, uint32_t num); | ||
| void lendian_to_host32(uint32_t *dest, const uint8_t *lendian); | ||
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| #ifdef __cplusplus | ||
| } // extern "C" | ||
| #endif | ||
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| #endif // C_TOXCORE_TOXCORE_STATE_H |
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