128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
#include "bmp_reader.h"
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#include <memory.h>
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#include <stdio.h>
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#include <stdlib.h>
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int readBmpImage(const char* fileName, BitMap* image) {
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size_t cnt;
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int status = 0;
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FILE* input = 0;
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if (NULL == fileName || NULL == image) {
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printf("[BMP] bad arguments\n");
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status = -1;
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goto Exit;
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}
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memset(image, 0, sizeof(BitMap));
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input = fopen(fileName, "rb");
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if (input == NULL) {
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printf("[BMP] file %s is not opened\n", fileName);
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status = 1;
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goto Exit;
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}
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cnt = fread(&image->header.type, sizeof(image->header.type), sizeof(unsigned char), input);
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if (cnt != sizeof(image->header.type)) {
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printf("[BMP] file read error\n");
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status = 2;
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goto Exit;
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}
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if (image->header.type != 'M' * 256 + 'B') {
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printf("[BMP] file is not bmp type\n");
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status = 2;
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goto Exit;
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}
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cnt = fread(&image->header.size, sizeof(image->header.size), sizeof(unsigned char), input);
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if (cnt != sizeof(image->header.size)) {
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printf("[BMP] file read error\n");
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status = 2;
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goto Exit;
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}
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cnt = fread(&image->header.reserved, sizeof(image->header.reserved), sizeof(unsigned char), input);
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if (cnt != sizeof(image->header.reserved)) {
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printf("[BMP] file read error\n");
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status = 2;
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goto Exit;
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}
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cnt = fread(&image->header.offset, sizeof(image->header.offset), sizeof(unsigned char), input);
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if (cnt != sizeof(image->header.offset)) {
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printf("[BMP] file read error\n");
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status = 2;
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goto Exit;
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}
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cnt = fread(&image->infoHeader, sizeof(BmpInfoHeader), sizeof(unsigned char), input);
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if (cnt != sizeof(image->header.offset)) {
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printf("[BMP] file read error\n");
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status = 2;
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goto Exit;
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}
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image->width = image->infoHeader.width;
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image->height = abs(image->infoHeader.height);
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if (image->infoHeader.bits != 24) {
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printf("[BMP] 24bpp only supported. But input has: %d\n", image->infoHeader.bits);
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return 3;
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}
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if (image->infoHeader.compression != 0) {
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printf("[BMP] compression not supported\n");
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return 4;
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}
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int padSize = image->width & 3;
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size_t row_size = (size_t)image->width * 3;
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char pad[3];
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size_t size = row_size * image->height;
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image->data = malloc(sizeof(char) * size);
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if (NULL == image->data) {
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printf("[BMP] memory allocation failed\n");
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return 5;
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}
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if (0 != fseek(input, image->header.offset, SEEK_SET)) {
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printf("[BMP] file seek error\n");
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status = 2;
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goto Exit;
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}
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// reading by rows in invert vertically
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int i;
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for (i = 0; i < image->height; i++) {
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unsigned int storeAt = image->infoHeader.height < 0 ? i : (unsigned int)image->height - 1 - i;
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cnt = fread(image->data + row_size * storeAt, row_size, sizeof(unsigned char), input);
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if (cnt != row_size) {
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printf("[BMP] file read error\n");
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status = 2;
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goto Exit;
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}
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cnt = fread(pad, padSize, sizeof(unsigned char), input);
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if (cnt != padSize) {
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printf("[BMP] file read error\n");
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status = 2;
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goto Exit;
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}
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}
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Exit:
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if (0 != status && NULL != image && NULL != image->data) {
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free(image->data);
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}
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if (NULL != input) {
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fclose(input);
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}
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return status;
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}
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