gbdk-2020 | GameBoy Development Kit |
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gbdk-support/makecom/bin_to_com.c
1 // This is free and unencumbered software released into the public domain.
2 // For more information, please refer to <https://unlicense.org>
3 // bbbbbr 2020
4
5 #include <stdio.h>
6 #include <string.h>
7 #include <stdlib.h>
8 #include <unistd.h>
9 #include <stdbool.h>
10 #include <stdint.h>
11
12 #include "common.h"
13 #include "list.h"
14 #include "files.h"
15 #include "noi_file.h"
16 #include "bin_to_com.h"
17
18
19 uint8_t * banks[BANKS_MAX_COUNT] = {NULL};
20 uint16_t banks_len[BANKS_MAX_COUNT] = {0};
21 uint16_t banks_count = 0;
22
23
24 void banks_cleanup(void) {
25 for (int c = 0; c <= BANKS_MAX_ID; c++) {
26 if (banks[c] != NULL) {
27
28 free(banks[c]);
29 banks[c] = NULL;
30 }
31 }
32 }
33
34
35 // Allocate memory for banks as banks are requested
36 // If preceding banks are not yet allocated then do those too
37 uint8_t * bank_get_ptr(uint16_t bank_num) {
38
39 if (bank_num > BANKS_MAX_ID) {
40 printf("makecom: ERROR: Requested bank %d is larger than max bank num %d!\n", bank_num, BANKS_MAX_ID);
41 exit(EXIT_FAILURE);
42 }
43
44 if (banks[bank_num] == NULL) {
45
46 // Make sure all banks leading up to requested are also allocated
47 for (int c = 0; c <= bank_num; c++) {
48 if (banks[c] == NULL) {
49
50 banks[c] = malloc(BANK_SIZE);
51
52 if (!banks[c]) {
53 printf("makecom: ERROR: Failed to allocate memory for bank %d!\n", c);
54 exit(EXIT_FAILURE);
55 }
56
57 // zero out buffer (though unused space will not get written out)
58 memset(banks[c], 0x00u, BANK_SIZE);
59 }
60 }
61 }
62
63 return banks[bank_num];
64 }
65
66
67
68 // Copy data from source bin file at offset address into requested bank buffer
69 void copy_to_bank(uint16_t bank_num, uint32_t rom_src_addr, uint32_t bank_out_addr, uint32_t length) {
70
71 // TODO: make sure bin src addr doesn't exceed source file buffer length
72 if ((rom_src_addr + length) > rom_buf_in_len) {
73 printf("makecom: ERROR: Can't copy %d bytes from %x for bank %d, would overflow past end of ROM source buffer of size %d!\n", length, rom_src_addr, bank_num, (uint32_t)rom_buf_in_len);
74 exit(EXIT_FAILURE);
75 }
76
77 if ((bank_out_addr + length) > BANK_SIZE) {
78 printf("makecom: ERROR: Can't copy %d bytes to %04x for bank %d, would overflow past end of bank buffer of size %d!\n",length, bank_out_addr, bank_num, BANK_SIZE);
79 exit(EXIT_FAILURE);
80 }
81
82 if (bank_num > banks_count)
83 banks_count = bank_num;
84
85 // Update length of bank data buffers (to allow for truncating output later)
86 if ((bank_out_addr + length) > banks_len[bank_num])
87 banks_len[bank_num] = (bank_out_addr + length);
88
89 // printf("* copying... bank:%d from:%x to:%x len:%d\n",
90 // bank_num, rom_src_addr, bank_out_addr, length);
91
92 memcpy(bank_get_ptr(bank_num) + bank_out_addr, p_rom_buf_in + rom_src_addr, length);
93 }
94
95
96 void banks_write_out(void) {
97
98 // If any of below fails it will trigger exit() and cleanup() will be called
99
100 // Write first bank out, handled differently than rest
101 if ((banks[0] != NULL) && (banks_len[0] > 0)) {
102 // printf("Bank %d: Writing %d bytes to %s\n",0, banks_len[0], filename_out_com);
103 file_write_from_buffer(filename_out_com, banks[0], banks_len[0]);
104 } else {
105 printf("makecom: Error: Bank 0 was empty, no data written\n");
106 exit;
107 }
108
109 // Write out remaining banks if applicable
110 char bank_fname[MAX_STR_LEN] = "";
111 for (int c = 1; c <= BANKS_MAX_ID; c++) {
112 if ((banks[c] != NULL) && (banks_len[0] > 0)) {
113 // Format to 8.3 filename with bank num as zero padded extension
114 sprintf(bank_fname, "%s.%03d", filename_banks_base, c);
115 // printf("Bank %d: Writing %d bytes to %s\n",c, banks_len[c], bank_fname);
116 file_write_from_buffer(bank_fname, banks[c], banks_len[c]);
117 } else
118 break; // Exit loop on first unpopulated bank
119 }
120
121 }
122
123
124
125 int bin2com(void) {
126
127 symbol_item * symbols = (symbol_item *)symbol_list.p_array;
128
129 for(int c = 0; c < symbol_list.count; c++) {
130
131 // Only process completed symbols (start and length both set, lenth not zero)
132 if ((symbols[c].addr_start != SYM_VAL_UNSET) &&
133 (symbols[c].length != SYM_VAL_UNSET) &&
134 (symbols[c].length > 0)) {
135
136 // If symbol is for a bank > 0
137 if ((strncmp(symbols[c].name, "_CODE_", (sizeof("_CODE_") - 1)) == 0) && (symbols[c].bank_num > 0)) {
138 // Copy data from bank addr in source ROM to start of separate bank buffer
139 copy_to_bank(symbols[c].bank_num, symbols[c].src_rom_addr, BANK_START_ADDR, symbols[c].length);
140 } else {
141 // For remaining symbols (assume bank 0), relocate them by -100 when possible (addr -> addr - 100)
142 copy_to_bank(BANK_0, symbols[c].addr_start, BANK_0_RELOC_ADDR(symbols[c].addr_start), symbols[c].length);
143 }
144 }
145 }
146
147 // Patch in updated bank / overlay count and bank filename
148 if ((banks_count > 0) && (overlay_count_addr != SYM_VAL_UNSET) && (overlay_name_addr != SYM_VAL_UNSET)) {
149
150 if (overlay_count_addr > BANK_0_ADDR_OFFSET)
151 *(banks[0] + (overlay_count_addr - BANK_0_ADDR_OFFSET)) = banks_count;
152
153 if (overlay_name_addr > BANK_0_ADDR_OFFSET)
154 memcpy(banks[0] + (overlay_name_addr - BANK_0_ADDR_OFFSET), filename_overlay, COM_OVERLAY_NAME_LEN-1);
155 }
156
157 // No write the data out
158 banks_write_out();
159
160 return EXIT_SUCCESS;
161 }
162
163
164
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