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117 lines
4.5 KiB
117 lines
4.5 KiB
/*
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* kk_ihex_read.h: A simple library for reading Intel HEX data. See
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* the accompanying kk_ihex_write.h for IHEX write support.
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*
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*
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* READING INTEL HEX DATA
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* ----------------------
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*
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* To read data in the Intel HEX format, you must perform the actual reading
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* of bytes using other means (e.g., stdio). The bytes read must then be
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* passed to `ihex_read_byte` and/or `ihex_read_bytes`. The reading functions
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* will then call `ihex_data_read`, at which stage the `struct ihex_state`
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* structure will contain the data along with its address. See below for
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* details and example implementation of `ihex_data_read`.
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*
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* The sequence to read data in IHEX format is:
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* struct ihex_state ihex;
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* ihex_begin_read(&ihex);
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* ihex_read_bytes(&ihex, my_input_bytes, length_of_my_input_bytes);
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* ihex_end_read(&ihex);
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*
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*
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* CONSERVING MEMORY
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* -----------------
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*
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* For memory-critical use, you can save additional memory by defining
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* `IHEX_LINE_MAX_LENGTH` as something less than 255. Note, however, that
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* this limit affects both reading and writing, so the resulting library
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* will be unable to read lines with more than this number of data bytes.
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* That said, I haven't encountered any IHEX files with more than 32
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* data bytes per line.
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*
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*
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* Copyright (c) 2013-2019 Kimmo Kulovesi, https://arkku.com/
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* Provided with absolutely no warranty, use at your own risk only.
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* Use and distribute freely, mark modified copies as such.
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*/
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#ifndef KK_IHEX_READ_H
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#define KK_IHEX_READ_H
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#ifdef __cplusplus
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#ifndef restrict
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#define restrict
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#endif
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extern "C" {
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#endif
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#include "kk_ihex.h"
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// Begin reading at address 0
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void ihex_begin_read(struct ihex_state *ihex);
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// Begin reading at `address` (the lowest 16 bits of which will be ignored);
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// this is required only if the high bytes of the 32-bit starting address
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// are not specified in the input data and they are non-zero
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void ihex_read_at_address(struct ihex_state *ihex,
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ihex_address_t address);
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// Read a single character
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void ihex_read_byte(struct ihex_state *ihex, char chr);
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// Read `count` bytes from `data`
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void ihex_read_bytes(struct ihex_state * restrict ihex,
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const char * restrict data,
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ihex_count_t count);
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// End reading (may call `ihex_data_read` if there is data waiting)
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void ihex_end_read(struct ihex_state *ihex);
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// Called when a complete line has been read, the record type of which is
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// passed as `type`. The `ihex` structure will have its fields `data`,
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// `line_length`, `address`, and `segment` set appropriately. In case
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// of reading an `IHEX_EXTENDED_LINEAR_ADDRESS_RECORD` or an
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// `IHEX_EXTENDED_SEGMENT_ADDRESS_RECORD` the record's data is not
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// yet parsed - it will be parsed into the `address` or `segment` field
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// only if `ihex_data_read` returns `true`. This allows manual handling
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// of extended addresses by parsing the `ihex->data` bytes.
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//
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// Possible error cases include checksum mismatch (which is indicated
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// as an argument), and excessive line length (in case this has been
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// compiled with `IHEX_LINE_MAX_LENGTH` less than 255) which is indicated
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// by `line_length` greater than `length`. Unknown record types and
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// other erroneous data is usually silently ignored by this minimalistic
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// parser. (It is recommended to compute a hash over the complete data
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// once received and verify that against the source.)
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//
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// Example implementation:
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//
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// ihex_bool_t ihex_data_read(struct ihex_state *ihex,
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// ihex_record_type_t type,
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// ihex_bool_t error) {
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// error = error || (ihex->length < ihex->line_length);
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// if (type == IHEX_DATA_RECORD && !error) {
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// (void) fseek(outfile, IHEX_LINEAR_ADDRESS(ihex), SEEK_SET);
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// (void) fwrite(ihex->data, 1, ihex->length, outfile);
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// } else if (type == IHEX_END_OF_FILE_RECORD) {
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// (void) fclose(outfile);
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// }
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// return !error;
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// }
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//
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extern ihex_bool_t ihex_data_read(struct ihex_state *ihex,
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ihex_record_type_t type,
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ihex_bool_t checksum_mismatch);
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// Begin reading at `segment`; this is required only if the initial segment
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// is not specified in the input data and it is non-zero.
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//
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#ifndef IHEX_DISABLE_SEGMENTS
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void ihex_read_at_segment(struct ihex_state *ihex, ihex_segment_t segment);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // !KK_IHEX_READ_H
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